Moving current trunk modules to contrib, before starting the Equinox branch merge

git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@718812 13f79535-47bb-0310-9956-ffa450edef68

16 files changed, 1675 insertions, 0 deletions

diff --git a/java/sca/contrib/modules/implementation-xquery/LICENSE b/java/sca/contrib/modules/implementation-xquery/LICENSE
new file mode 100644
index 0000000000..d645695673
--- /dev/null
+++ b/java/sca/contrib/modules/implementation-xquery/LICENSE
@@ -0,0 +1,202 @@
+
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+      "Contribution" shall mean any work of authorship, including
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+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
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+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
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+      meet the following conditions:
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+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
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+      (c) You must retain, in the Source form of any Derivative Works
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+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
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diff --git a/java/sca/contrib/modules/implementation-xquery/NOTICE b/java/sca/contrib/modules/implementation-xquery/NOTICE
new file mode 100644
index 0000000000..fdfa0e9faa
--- /dev/null
+++ b/java/sca/contrib/modules/implementation-xquery/NOTICE
@@ -0,0 +1,6 @@
+${pom.name}
+Copyright (c) 2005 - 2008 The Apache Software Foundation
+
+This product includes software developed by
+The Apache Software Foundation (http://www.apache.org/).
+
diff --git a/java/sca/contrib/modules/implementation-xquery/pom.xml b/java/sca/contrib/modules/implementation-xquery/pom.xml
new file mode 100644
index 0000000000..0985cd0463
--- /dev/null
+++ b/java/sca/contrib/modules/implementation-xquery/pom.xml
@@ -0,0 +1,105 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+    * Licensed to the Apache Software Foundation (ASF) under one
+    * or more contributor license agreements.  See the NOTICE file
+    * distributed with this work for additional information
+    * regarding copyright ownership.  The ASF licenses this file
+    * to you under the Apache License, Version 2.0 (the
+    * "License"); you may not use this file except in compliance
+    * with the License.  You may obtain a copy of the License at
+    * 
+    *   http://www.apache.org/licenses/LICENSE-2.0
+    * 
+    * Unless required by applicable law or agreed to in writing,
+    * software distributed under the License is distributed on an
+    * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+    * KIND, either express or implied.  See the License for the
+    * specific language governing permissions and limitations
+    * under the License.    
+-->
+<project>
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>org.apache.tuscany.sca</groupId>
+        <artifactId>tuscany-modules</artifactId>
+        <version>2.0-SNAPSHOT</version>
+        <relativePath>../pom.xml</relativePath>
+    </parent>
+
+    <artifactId>tuscany-implementation-xquery</artifactId>
+    <name>Apache Tuscany SCA XQuery Implementation Extension</name>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.tuscany.sca</groupId>
+            <artifactId>tuscany-assembly</artifactId>
+            <version>2.0-SNAPSHOT</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.apache.tuscany.sca</groupId>
+            <artifactId>tuscany-interface-java-xml</artifactId>
+            <version>2.0-SNAPSHOT</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.apache.tuscany.sca</groupId>
+            <artifactId>tuscany-implementation-java-runtime</artifactId>
+            <version>2.0-SNAPSHOT</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.apache.tuscany.sca</groupId>
+            <artifactId>tuscany-databinding-saxon</artifactId>
+            <version>2.0-SNAPSHOT</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.apache.tuscany.sca</groupId>
+            <artifactId>tuscany-databinding-jaxb</artifactId>
+            <version>2.0-SNAPSHOT</version>
+            <scope>runtime</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.apache.tuscany.sca</groupId>
+            <artifactId>tuscany-core-spi</artifactId>
+            <version>2.0-SNAPSHOT</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.apache.tuscany.sca</groupId>
+            <artifactId>tuscany-host-embedded</artifactId>
+            <version>2.0-SNAPSHOT</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.5</version>
+            <scope>test</scope>
+        </dependency>
+
+    </dependencies>
+
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.felix</groupId>
+                <artifactId>maven-bundle-plugin</artifactId>
+
+                <configuration>
+                    <instructions>
+                        <Bundle-Version>${tuscany.version}</Bundle-Version>
+                        <Bundle-SymbolicName>org.apache.tuscany.sca.implementation.xquery</Bundle-SymbolicName>
+                        <Bundle-Description>${pom.name}</Bundle-Description>
+                        <Export-Package>org.apache.tuscany.sca.implementation.xquery*</Export-Package>
+                    </instructions>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>
diff --git a/java/sca/contrib/modules/implementation-xquery/src/main/java/org/apache/tuscany/sca/implementation/xquery/XQueryImplementation.java b/java/sca/contrib/modules/implementation-xquery/src/main/java/org/apache/tuscany/sca/implementation/xquery/XQueryImplementation.java
new file mode 100644
index 0000000000..f5bc5dd9b8
--- /dev/null
+++ b/java/sca/contrib/modules/implementation-xquery/src/main/java/org/apache/tuscany/sca/implementation/xquery/XQueryImplementation.java
@@ -0,0 +1,75 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.tuscany.sca.implementation.xquery;
+
+import java.lang.reflect.Method;
+import java.util.Map;
+
+import net.sf.saxon.query.XQueryExpression;
+
+import org.apache.tuscany.sca.assembly.Implementation;
+
+/**
+ * Class representing the XQuery implementation type
+ * @version $Rev$ $Date$
+ */
+public interface XQueryImplementation extends Implementation {
+
+    /**
+     * Location of the XQuery implementation file
+     * @return
+     */
+    String getLocation();
+
+    void setLocation(String location);
+
+    String getLocationURL();
+
+    void setLocationURL(String location);
+
+    /**
+     * The XQuery expression that is loaded from the XQuery implementation file
+     * @return
+     */
+    String getXqExpression();
+
+    void setXqExpression(String expression);
+
+    /**
+     * The XQuery expression should be extended for with additional
+     * script, which provides the external variables needed to invoke
+     * a function. In this way for each function that is defined in the
+     * original XQuery expression additional expression is defined, which
+     * can invoke this function, using external variables as input.
+     * These expression extensions are stored in this map. It provides for
+     * each method of a service interface that is implemented by this component
+     * type corresponding expression extension
+     * @return
+     */
+    Map<Method, String> getXqExpressionExtensionsMap();
+
+    /**
+     * This map is a kind of cache for function invocations. If a given
+     * XQuery function of this implementation has been invoked already
+     * its compiled expression can be reused. In this manner the performance
+     * can be increased
+     * @return
+     */
+    Map<String, XQueryExpression> getCompiledExpressionsCache();
+}
diff --git a/java/sca/contrib/modules/implementation-xquery/src/main/java/org/apache/tuscany/sca/implementation/xquery/XQueryImplementationFactory.java b/java/sca/contrib/modules/implementation-xquery/src/main/java/org/apache/tuscany/sca/implementation/xquery/XQueryImplementationFactory.java
new file mode 100644
index 0000000000..bdfd390499
--- /dev/null
+++ b/java/sca/contrib/modules/implementation-xquery/src/main/java/org/apache/tuscany/sca/implementation/xquery/XQueryImplementationFactory.java
@@ -0,0 +1,32 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.tuscany.sca.implementation.xquery;
+
+import org.apache.tuscany.sca.implementation.xquery.impl.XQueryImplementationFactoryImpl;
+
+/**
+ * Provides instances of XQueryImplementation classes
+ * @version $Rev$ $Date$
+ */
+public interface XQueryImplementationFactory {
+
+    XQueryImplementationFactory INSTANCE = new XQueryImplementationFactoryImpl();
+
+    XQueryImplementation createXQueryImplementation();
+}
diff --git a/java/sca/contrib/modules/implementation-xquery/src/main/java/org/apache/tuscany/sca/implementation/xquery/XQueryImplementationProvider.java b/java/sca/contrib/modules/implementation-xquery/src/main/java/org/apache/tuscany/sca/implementation/xquery/XQueryImplementationProvider.java
new file mode 100644
index 0000000000..63a3a49e13
--- /dev/null
+++ b/java/sca/contrib/modules/implementation-xquery/src/main/java/org/apache/tuscany/sca/implementation/xquery/XQueryImplementationProvider.java
@@ -0,0 +1,166 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.tuscany.sca.implementation.xquery;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import javax.xml.namespace.QName;
+
+import org.apache.tuscany.sca.assembly.ComponentProperty;
+import org.apache.tuscany.sca.assembly.Reference;
+import org.apache.tuscany.sca.assembly.Service;
+import org.apache.tuscany.sca.core.factory.ObjectFactory;
+import org.apache.tuscany.sca.databinding.javabeans.SimpleJavaDataBinding;
+import org.apache.tuscany.sca.databinding.saxon.SaxonNodeDataBinding;
+import org.apache.tuscany.sca.databinding.saxon.SaxonValueDataBinding;
+import org.apache.tuscany.sca.implementation.java.injection.JavaPropertyValueObjectFactory;
+import org.apache.tuscany.sca.interfacedef.DataType;
+import org.apache.tuscany.sca.interfacedef.Interface;
+import org.apache.tuscany.sca.interfacedef.InterfaceContract;
+import org.apache.tuscany.sca.interfacedef.Operation;
+import org.apache.tuscany.sca.interfacedef.java.JavaInterface;
+import org.apache.tuscany.sca.interfacedef.util.JavaXMLMapper;
+import org.apache.tuscany.sca.invocation.Invoker;
+import org.apache.tuscany.sca.provider.ImplementationProvider;
+import org.apache.tuscany.sca.runtime.RuntimeComponent;
+import org.apache.tuscany.sca.runtime.RuntimeComponentService;
+
+/**
+ * Provides the runtime configuration of XQuery-typed component.
+ * 
+ * Generally the following is done:
+ * 1. During construction all services and references are provided
+ *    with the Saxon data binding, which is the one required by the 
+ *    XQueryInvoker
+ * 
+ * 2. During startup:
+ *    - a proxy is created for each reference and it is kept in the referenceProxies
+ *      map, which is used later by the invoker to configure the Saxon parser;
+ *    - each property value is read and put into the properties map. This is
+ *      again used by the invoker to configure the Saxon parser
+ *
+ * @version $Rev$ $Date$
+ */
+public class XQueryImplementationProvider implements ImplementationProvider {
+
+    private RuntimeComponent component;
+    private XQueryImplementation implementation;
+    private Map<String, Object> referenceProxies = new HashMap<String, Object>();
+    private Map<String, Object> properties = new HashMap<String, Object>();
+    private JavaPropertyValueObjectFactory javaFactory;
+
+    public XQueryImplementationProvider(RuntimeComponent component,
+                                        XQueryImplementation implementation,
+                                        JavaPropertyValueObjectFactory factory) {
+        this.component = component;
+        this.implementation = implementation;
+        this.javaFactory = factory;
+        init();
+    }
+
+    private void init() {
+        List<Service> services = implementation.getServices();
+        for (Service sevice : services) {
+            InterfaceContract interfaceContract = sevice.getInterfaceContract();
+            //interfaceContract.getInterface().setDefaultDataBinding(ValueRepresentation.class.getName());
+            setDataBinding(interfaceContract.getInterface(), false);
+        }
+
+        List<Reference> references = implementation.getReferences();
+        for (Reference reference : references) {
+            InterfaceContract interfaceContract = reference.getInterfaceContract();
+            //interfaceContract.getInterface().setDefaultDataBinding(ValueRepresentation.class.getName());
+            setDataBinding(interfaceContract.getInterface(), true);
+        }
+    }
+
+    public Invoker createInvoker(RuntimeComponentService service, Operation operation) {
+        return new XQueryInvoker(service, operation, implementation, referenceProxies, properties);
+    }
+
+    public boolean supportsOneWayInvocation() {
+        return false;
+    }
+
+    public void start() {
+
+        for (Reference reference : component.getReferences()) {
+            String refName = reference.getName();
+            if (refName.startsWith("$self$.")) {
+                continue;
+            }
+            Class interfaze = ((JavaInterface)reference.getInterfaceContract().getInterface()).getJavaClass();
+            Object refProxy = component.getComponentContext().getService(interfaze, refName);
+            referenceProxies.put(refName, refProxy);
+        }
+
+        for (ComponentProperty property : component.getProperties()) {
+            String propName = property.getName();
+            QName xmlType = property.getXSDType();
+            Class clazz = JavaXMLMapper.getJavaType(xmlType);
+
+            Object propertyValue = null;
+            if (clazz == null || java.lang.Object.class.equals(clazz)) {
+                propertyValue = property.getValue();
+            } else {
+                ObjectFactory objfactory = javaFactory.createValueFactory(property, property.getValue(), clazz);
+                propertyValue = objfactory.getInstance();
+            }
+            properties.put(propName, propertyValue);
+        }
+    }
+
+    private void setDataBinding(Interface interfaze, boolean isReference) {
+        List<Operation> operations = interfaze.getOperations();
+        for (Operation operation : operations) {
+            operation.setDataBinding(SaxonNodeDataBinding.NAME);
+            DataType<List<DataType>> inputType = operation.getInputType();
+            if (inputType != null) {
+                List<DataType> logical = inputType.getLogical();
+                for (DataType inArg : logical) {
+                    if (SimpleJavaDataBinding.NAME.equals(inArg.getDataBinding())) {
+                        if (!isReference) {
+                            inArg.setDataBinding(SaxonValueDataBinding.NAME);
+                        }
+                    } else {
+                        inArg.setDataBinding(SaxonNodeDataBinding.NAME);
+                    }
+                }
+            }
+            DataType outputType = operation.getOutputType();
+            if (outputType != null) {
+                if (SimpleJavaDataBinding.NAME.equals(outputType.getDataBinding())) {
+                    if (!isReference) {
+                        outputType.setDataBinding(SaxonValueDataBinding.NAME);
+                    }
+                } else {
+                    outputType.setDataBinding(SaxonNodeDataBinding.NAME);
+                }
+            }
+        }
+    }
+
+    public void stop() {
+        // TODO Auto-generated method stub
+
+    }
+
+}
diff --git a/java/sca/contrib/modules/implementation-xquery/src/main/java/org/apache/tuscany/sca/implementation/xquery/XQueryImplementationProviderFactory.java b/java/sca/contrib/modules/implementation-xquery/src/main/java/org/apache/tuscany/sca/implementation/xquery/XQueryImplementationProviderFactory.java
new file mode 100644
index 0000000000..57536e502b
--- /dev/null
+++ b/java/sca/contrib/modules/implementation-xquery/src/main/java/org/apache/tuscany/sca/implementation/xquery/XQueryImplementationProviderFactory.java
@@ -0,0 +1,54 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.tuscany.sca.implementation.xquery;
+
+import org.apache.tuscany.sca.core.ExtensionPointRegistry;
+import org.apache.tuscany.sca.databinding.DataBindingExtensionPoint;
+import org.apache.tuscany.sca.databinding.TransformerExtensionPoint;
+import org.apache.tuscany.sca.databinding.impl.MediatorImpl;
+import org.apache.tuscany.sca.implementation.java.injection.JavaPropertyValueObjectFactory;
+import org.apache.tuscany.sca.provider.ImplementationProvider;
+import org.apache.tuscany.sca.provider.ImplementationProviderFactory;
+import org.apache.tuscany.sca.runtime.RuntimeComponent;
+
+/**
+ * A factory for XQuery implementation providers
+ * @version $Rev$ $Date$
+ */
+public class XQueryImplementationProviderFactory implements ImplementationProviderFactory<XQueryImplementation> {
+
+    private JavaPropertyValueObjectFactory javaFactory;
+
+    public XQueryImplementationProviderFactory(ExtensionPointRegistry registry) {
+        DataBindingExtensionPoint dataBindings = registry.getExtensionPoint(DataBindingExtensionPoint.class);
+        TransformerExtensionPoint transformers = registry.getExtensionPoint(TransformerExtensionPoint.class);
+        MediatorImpl mediator = new MediatorImpl(dataBindings, transformers);
+        this.javaFactory = new JavaPropertyValueObjectFactory(mediator);
+    }
+
+    public ImplementationProvider createImplementationProvider(RuntimeComponent component,
+                                                               XQueryImplementation implementation) {
+        return new XQueryImplementationProvider(component, implementation, javaFactory);
+    }
+
+    public Class<XQueryImplementation> getModelType() {
+        return XQueryImplementation.class;
+    }
+
+}
diff --git a/java/sca/contrib/modules/implementation-xquery/src/main/java/org/apache/tuscany/sca/implementation/xquery/XQueryInvokationException.java b/java/sca/contrib/modules/implementation-xquery/src/main/java/org/apache/tuscany/sca/implementation/xquery/XQueryInvokationException.java
new file mode 100644
index 0000000000..0c628b3715
--- /dev/null
+++ b/java/sca/contrib/modules/implementation-xquery/src/main/java/org/apache/tuscany/sca/implementation/xquery/XQueryInvokationException.java
@@ -0,0 +1,33 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.tuscany.sca.implementation.xquery;
+
+/**
+ * Exception class used by the XQueryInvoker to report problems in
+ * XQuery script invocation
+ * @version $Rev$ $Date$
+ */
+public class XQueryInvokationException extends Exception {
+
+    private static final long serialVersionUID = -2674411654705699541L;
+
+    public XQueryInvokationException(String msg) {
+        super(msg);
+    }
+}
diff --git a/java/sca/contrib/modules/implementation-xquery/src/main/java/org/apache/tuscany/sca/implementation/xquery/XQueryInvoker.java b/java/sca/contrib/modules/implementation-xquery/src/main/java/org/apache/tuscany/sca/implementation/xquery/XQueryInvoker.java
new file mode 100644
index 0000000000..2a9673068b
--- /dev/null
+++ b/java/sca/contrib/modules/implementation-xquery/src/main/java/org/apache/tuscany/sca/implementation/xquery/XQueryInvoker.java
@@ -0,0 +1,318 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.tuscany.sca.implementation.xquery;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.lang.reflect.Method;
+import java.util.List;
+import java.util.Map;
+import java.util.Properties;
+
+import javax.xml.transform.OutputKeys;
+import javax.xml.transform.Transformer;
+import javax.xml.transform.TransformerFactory;
+import javax.xml.transform.dom.DOMSource;
+import javax.xml.transform.stream.StreamResult;
+import javax.xml.transform.stream.StreamSource;
+
+import net.sf.saxon.Configuration;
+import net.sf.saxon.event.Builder;
+import net.sf.saxon.om.DocumentInfo;
+import net.sf.saxon.om.Item;
+import net.sf.saxon.om.NodeInfo;
+import net.sf.saxon.om.SequenceIterator;
+import net.sf.saxon.query.DynamicQueryContext;
+import net.sf.saxon.query.QueryResult;
+import net.sf.saxon.query.StaticQueryContext;
+import net.sf.saxon.query.XQueryExpression;
+import net.sf.saxon.trans.XPathException;
+import net.sf.saxon.value.Value;
+
+import org.apache.tuscany.sca.databinding.saxon.SaxonDataBindingHelper;
+import org.apache.tuscany.sca.databinding.saxon.collection.ItemList;
+import org.apache.tuscany.sca.interfacedef.DataType;
+import org.apache.tuscany.sca.interfacedef.Operation;
+import org.apache.tuscany.sca.interfacedef.java.JavaInterface;
+import org.apache.tuscany.sca.invocation.Invoker;
+import org.apache.tuscany.sca.invocation.Message;
+import org.apache.tuscany.sca.runtime.RuntimeComponentService;
+import org.w3c.dom.Document;
+import org.w3c.dom.Element;
+import org.w3c.dom.Node;
+import org.w3c.dom.NodeList;
+
+/**
+ * Performs the invocation of a requested XQuery function
+ * @version $Rev$ $Date$
+ */
+public class XQueryInvoker implements Invoker {
+
+    private RuntimeComponentService service;
+    private Operation operation;
+    private Method theMethod;
+    private XQueryImplementation implementation;
+    private Map<String, Object> referenceProxies;
+    private Map<String, Object> properties;
+
+    /**
+     * Constructs a new instance of the xquery invoker.
+     * Also performs a search of java.lang.Method instance
+     * that corresponds to the invoked operation
+     */
+    public XQueryInvoker(RuntimeComponentService service,
+                         Operation operation,
+                         XQueryImplementation implementation,
+                         Map<String, Object> referenceProxies,
+                         Map<String, Object> properties) {
+        this.service = service;
+        this.operation = operation;
+        this.implementation = implementation;
+        this.referenceProxies = referenceProxies;
+        this.properties = properties;
+
+        findMatchingMethod();
+    }
+
+    /**
+     * This method contains the XQuery invocation logic
+     * The following steps are performed:
+     * 1. XQuery expression is produced by combining the original expression
+     *    and the function invocation extension (See XQueryImplementation.getXqExpressionExtensionsMap()
+     *    for details)
+     * 2. A check is performed if this expression has been invoked already. If yes -
+     *    it is taken from the cache
+     * 3. Configuration for the execution is either created or retrieved from
+     *    the cached expression
+     * 4. The input parameters of the operation to be invoked are taken from the
+     *    payload and transformed to ones that are built with the current 
+     *    configuration. 
+     *    NOTE: This is unnecessary overhead - can the Configuration
+     *    object be attached in some way to the invocation request?
+     * 5. All parameters, reference proxies and property values are mapped
+     *    to external variables of the XQuery script
+     * 6. The query is executed and all the results are stored in a ItemList object
+     *    
+     *    NOTE: During execution of the XQuery a static variable is set with
+     *    the current configuration. This variable is used by the NodeInfo transformers
+     *    to produce the correct NodeInfo for all Output2Output transformations, which
+     *    happen as result of the XQuery component invoking some reference components
+     *    The old state of the static configuration is preserved and in this way allowing
+     *    to nest XQuery component invocations (i.e. one XQuery component invokes another
+     *    one)
+     */
+    private Object doInvoke(Object payload) throws XQueryInvokationException, XPathException {
+        if (theMethod == null) {
+            throw new XQueryInvokationException("No java method for operation: " + operation.getName());
+        }
+        String xqExpression =
+            implementation.getXqExpression() + implementation.getXqExpressionExtensionsMap().get(theMethod);
+
+        Configuration config = null;
+        Properties props = new Properties();
+        props.setProperty(OutputKeys.METHOD, "xml");
+        props.setProperty(OutputKeys.INDENT, "yes");
+
+        XQueryExpression exp = implementation.getCompiledExpressionsCache().get(xqExpression);
+        if (exp == null) {
+            config = new Configuration();
+            StaticQueryContext sqc = new StaticQueryContext(config);
+            exp = sqc.compileQuery(xqExpression);
+            implementation.getCompiledExpressionsCache().put(xqExpression, exp);
+        } else {
+            config = exp.getStaticContext().getConfiguration();
+        }
+
+        Object[] params = prepareParameters(payload, config, props);
+
+        DynamicQueryContext dynamicContext = new DynamicQueryContext(config);
+
+        // Setting the parameters for function invocation
+        String methodName = theMethod.getName();
+        for (int i = 0; i < params.length; i++) {
+            dynamicContext.setParameter(methodName + "_" + i, params[i]);
+        }
+
+        // Setting references
+        for (Map.Entry<String, Object> entry : referenceProxies.entrySet()) {
+            dynamicContext.setParameter(entry.getKey(), entry.getValue());
+        }
+
+        // Setting properties
+        for (Map.Entry<String, Object> entry : properties.entrySet()) {
+            dynamicContext.setParameter(entry.getKey(), transformProperty(entry.getValue(), config));
+        }
+
+        SequenceIterator iterator = null;
+        Configuration oldConfigValue = SaxonDataBindingHelper.CURR_EXECUTING_CONFIG;
+        SaxonDataBindingHelper.CURR_EXECUTING_CONFIG = config;
+        try {
+            iterator = exp.iterator(dynamicContext);
+        } finally {
+            SaxonDataBindingHelper.CURR_EXECUTING_CONFIG = oldConfigValue;
+        }
+        
+        ItemList list = new ItemList();
+        Item item = iterator.next();
+               
+        while (item != null) {
+        	list.add(item);
+        	item = iterator.next();
+        	
+        }
+        
+        if (list.size() == 0) {
+            return null;
+            
+        } else if (list.size() == 1) {
+        
+        	item = list.iterator().next();
+        	
+        	if (item instanceof NodeInfo) {
+                return item;
+            } else {
+                return Value.asValue(item);
+            }
+        	
+        }
+        
+        return list;
+        
+    }
+
+    public Message invoke(Message msg) {
+        try {
+            Object resp = doInvoke(msg.getBody());
+            msg.setBody(resp);
+        } catch (XQueryInvokationException e) {
+            msg.setFaultBody(e.getCause());
+        } catch (XPathException e) {
+            msg.setFaultBody(e.getCause());
+        }
+        return msg;
+    }
+
+    private void findMatchingMethod() {
+        Class<?> interfaze = ((JavaInterface)service.getInterfaceContract().getInterface()).getJavaClass();
+
+        for (Method method : interfaze.getMethods()) {
+            if (match(operation, method)) {
+                theMethod = method;
+            }
+        }
+    }
+
+    private static boolean match(Operation operation, Method method) {
+        Class<?>[] params = method.getParameterTypes();
+        DataType<List<DataType>> inputType = operation.getInputType();
+        List<DataType> types = inputType.getLogical();
+        boolean matched = true;
+        if (types.size() == params.length && method.getName().equals(operation.getName())) {
+            for (int i = 0; i < params.length; i++) {
+                Class<?> clazz = params[i];
+                if (!clazz.equals(operation.getInputType().getLogical().get(i).getPhysical())) {
+                    matched = false;
+                }
+            }
+        } else {
+            matched = false;
+        }
+        return matched;
+
+    }
+
+    private Object[] prepareParameters(Object payload, Configuration configuration, Properties props) {
+        if (payload == null) {
+            return new Object[0];
+        }
+        Object[] inputArguments = null;
+        if (payload.getClass().isArray()) {
+            inputArguments = (Object[])payload;
+        } else {
+            inputArguments = new Object[1];
+            inputArguments[0] = payload;
+        }
+
+        Object[] parameters = new Object[inputArguments.length];
+
+        for (int i = 0; i < inputArguments.length; i++) {
+            if (inputArguments[i] instanceof NodeInfo) {
+                ByteArrayOutputStream baos = new ByteArrayOutputStream();
+                StreamResult sw = new StreamResult(baos);
+                try {
+                    QueryResult.serialize((NodeInfo)inputArguments[i], sw, props, ((NodeInfo)inputArguments[i]).getConfiguration());
+                    baos.close();
+                    ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
+                    StreamSource ss = new StreamSource(bais);
+                    parameters[i] = Builder.build(ss, null, configuration);
+                } catch (Exception e) {
+                    e.printStackTrace();
+                    parameters[i] = null;
+                }
+            } else {
+                parameters[i] = inputArguments[i];
+            }
+        }
+
+        return parameters;
+    }
+
+    private Object transformProperty(Object argument, Configuration configuration) {
+        Object parameter = argument;
+        if (argument instanceof Document) {
+            try {
+                Document doc = (Document)argument;
+                Node valueNode = doc.getFirstChild();
+                DocumentInfo docInfo = null;
+                if (valueNode instanceof Element && valueNode.getNodeName().equals("value")) {
+                    ByteArrayOutputStream baos = new ByteArrayOutputStream();
+                    StreamResult sr = new StreamResult(baos);
+                    try {
+                        Node element = null;
+                        NodeList list = valueNode.getChildNodes();
+                        for (int i = 0; i < list.getLength(); i++) {
+                            if (list.item(i).getNodeType() == Node.ELEMENT_NODE) {
+                                element = list.item(i);
+                                break;
+                            }
+                        }
+                        if (element == null) {
+                            element = valueNode.getFirstChild();
+                        }
+                        Transformer transformer = TransformerFactory.newInstance().newTransformer();
+                        transformer.transform(new DOMSource(element), sr);
+                        ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
+                        docInfo = (DocumentInfo)Builder.build(new StreamSource(bais), null, configuration);
+                    } catch (Exception e) {
+                        e.printStackTrace();
+                        return parameter;
+                    }
+                } else {
+                	docInfo = (DocumentInfo)Builder.build(new DOMSource(doc), null, configuration);
+                }
+                parameter = docInfo;
+            } catch (XPathException e) {
+                e.printStackTrace();
+                return parameter;
+            }
+        }
+
+        return parameter;
+    }
+}
diff --git a/java/sca/contrib/modules/implementation-xquery/src/main/java/org/apache/tuscany/sca/implementation/xquery/impl/XQueryImplementationFactoryImpl.java b/java/sca/contrib/modules/implementation-xquery/src/main/java/org/apache/tuscany/sca/implementation/xquery/impl/XQueryImplementationFactoryImpl.java
new file mode 100644
index 0000000000..5e77575c3c
--- /dev/null
+++ b/java/sca/contrib/modules/implementation-xquery/src/main/java/org/apache/tuscany/sca/implementation/xquery/impl/XQueryImplementationFactoryImpl.java
@@ -0,0 +1,35 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.tuscany.sca.implementation.xquery.impl;
+
+import org.apache.tuscany.sca.implementation.xquery.XQueryImplementation;
+import org.apache.tuscany.sca.implementation.xquery.XQueryImplementationFactory;
+
+/**
+ * Actual implementation of the XQuery implementation factory
+ * @version $Rev$ $Date$
+ */
+public class XQueryImplementationFactoryImpl implements XQueryImplementationFactory {
+
+    public XQueryImplementation createXQueryImplementation() {
+        XQueryImplementation implementation = new XQueryImplementationImpl();
+        return implementation;
+    }
+
+}
diff --git a/java/sca/contrib/modules/implementation-xquery/src/main/java/org/apache/tuscany/sca/implementation/xquery/impl/XQueryImplementationImpl.java b/java/sca/contrib/modules/implementation-xquery/src/main/java/org/apache/tuscany/sca/implementation/xquery/impl/XQueryImplementationImpl.java
new file mode 100644
index 0000000000..77c8eea511
--- /dev/null
+++ b/java/sca/contrib/modules/implementation-xquery/src/main/java/org/apache/tuscany/sca/implementation/xquery/impl/XQueryImplementationImpl.java
@@ -0,0 +1,102 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.tuscany.sca.implementation.xquery.impl;
+
+import java.lang.reflect.Method;
+import java.util.HashMap;
+import java.util.Map;
+
+import net.sf.saxon.query.XQueryExpression;
+
+import org.apache.tuscany.sca.assembly.impl.ImplementationImpl;
+import org.apache.tuscany.sca.implementation.xquery.XQueryImplementation;
+
+/**
+ * Actual implementation of the XQuery implementation
+ * @version $Rev$ $Date$
+ */
+public class XQueryImplementationImpl extends ImplementationImpl implements XQueryImplementation {
+
+    private String location;
+    private String locationURL;
+    private String xqExpression;
+
+    private Map<String, XQueryExpression> compiledExpressionsCache = new HashMap<String, XQueryExpression>();
+    private Map<Method, String> xqExpressionExtensionsMap = new HashMap<Method, String>();
+
+    public XQueryImplementationImpl() {
+        setUnresolved(true);
+    }
+
+    public String getLocation() {
+        return location;
+    }
+
+    public void setLocation(String location) {
+        this.location = location;
+    }
+    
+    public String getLocationURL() {
+        return locationURL;
+    }
+
+    public void setLocationURL(String locationURL) {
+        this.locationURL = locationURL;
+    }
+
+    public String getXqExpression() {
+        return xqExpression;
+    }
+
+    public void setXqExpression(String xqExpression) {
+        this.xqExpression = xqExpression;
+    }
+
+    public Map<String, XQueryExpression> getCompiledExpressionsCache() {
+        return compiledExpressionsCache;
+    }
+
+    public Map<Method, String> getXqExpressionExtensionsMap() {
+        return xqExpressionExtensionsMap;
+    }
+
+    @Override
+    public int hashCode() {
+        final int PRIME = 31;
+        int result = super.hashCode();
+        result = PRIME * result + ((location == null) ? 0 : location.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj)
+            return true;
+        if (obj == null || getClass() != obj.getClass())
+            return false;
+        final XQueryImplementationImpl other = (XQueryImplementationImpl)obj;
+        if (location == null) {
+            if (other.location != null)
+                return false;
+        } else if (!location.equals(other.location))
+            return false;
+        return true;
+    }
+
+}
diff --git a/java/sca/contrib/modules/implementation-xquery/src/main/java/org/apache/tuscany/sca/implementation/xquery/xml/XQueryImplementationProcessor.java b/java/sca/contrib/modules/implementation-xquery/src/main/java/org/apache/tuscany/sca/implementation/xquery/xml/XQueryImplementationProcessor.java
new file mode 100644
index 0000000000..9adce78310
--- /dev/null
+++ b/java/sca/contrib/modules/implementation-xquery/src/main/java/org/apache/tuscany/sca/implementation/xquery/xml/XQueryImplementationProcessor.java
@@ -0,0 +1,159 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.tuscany.sca.implementation.xquery.xml;
+
+import static javax.xml.stream.XMLStreamConstants.END_ELEMENT;
+
+import javax.xml.namespace.QName;
+import javax.xml.stream.XMLStreamException;
+import javax.xml.stream.XMLStreamReader;
+import javax.xml.stream.XMLStreamWriter;
+
+import org.apache.tuscany.sca.assembly.AssemblyFactory;
+import org.apache.tuscany.sca.assembly.builder.impl.ProblemImpl;
+import org.apache.tuscany.sca.assembly.xml.Constants;
+import org.apache.tuscany.sca.contribution.Artifact;
+import org.apache.tuscany.sca.contribution.ContributionFactory;
+import org.apache.tuscany.sca.contribution.ModelFactoryExtensionPoint;
+import org.apache.tuscany.sca.contribution.processor.StAXArtifactProcessor;
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+import org.apache.tuscany.sca.contribution.service.ContributionReadException;
+import org.apache.tuscany.sca.contribution.service.ContributionResolveException;
+import org.apache.tuscany.sca.contribution.service.ContributionWriteException;
+import org.apache.tuscany.sca.implementation.xquery.XQueryImplementation;
+import org.apache.tuscany.sca.implementation.xquery.XQueryImplementationFactory;
+import org.apache.tuscany.sca.interfacedef.java.JavaInterfaceFactory;
+import org.apache.tuscany.sca.monitor.Monitor;
+import org.apache.tuscany.sca.monitor.Problem;
+import org.apache.tuscany.sca.monitor.Problem.Severity;
+
+/**
+ * Processor for the XQuery implementation type artifact
+ * @version $Rev$ $Date$
+ */
+public class XQueryImplementationProcessor implements StAXArtifactProcessor<XQueryImplementation> {
+
+    private static final String LOCATION = "location";
+    private static final String IMPLEMENTATION_XQUERY = "implementation.xquery";
+    private static final QName IMPLEMENTATION_XQUERY_QNAME =
+        new QName(Constants.SCA10_TUSCANY_NS, IMPLEMENTATION_XQUERY);
+    
+    private AssemblyFactory assemblyFactory;
+    private JavaInterfaceFactory javaFactory;
+    private ContributionFactory contributionFactory;
+    private Monitor monitor;
+
+    public XQueryImplementationProcessor(ModelFactoryExtensionPoint modelFactoryExtensionPoint, Monitor monitor) {
+        assemblyFactory = modelFactoryExtensionPoint.getFactory(AssemblyFactory.class);
+        javaFactory = modelFactoryExtensionPoint.getFactory(JavaInterfaceFactory.class);
+        contributionFactory = modelFactoryExtensionPoint.getFactory(ContributionFactory.class);
+        this.monitor = monitor;
+    }
+    
+    /**
+     * Report a error.
+     * 
+     * @param problems
+     * @param message
+     * @param model
+     */
+    private void error(String message, Object model, Object... messageParameters) {
+    	 if (monitor != null) {
+	        Problem problem = new ProblemImpl(this.getClass().getName(), "impl-xquery-validation-messages", Severity.ERROR, model, message, (Object[])messageParameters);
+	        monitor.problem(problem);
+    	 }
+    }
+
+    public QName getArtifactType() {
+        return IMPLEMENTATION_XQUERY_QNAME;
+    }
+
+    /**
+     * Reads  from the stream and sets the location attribute of the implementation correspondingly
+     */
+    public XQueryImplementation read(XMLStreamReader reader)
+        throws ContributionReadException, XMLStreamException {
+    	
+    	/* Create the XQuery implementation and set the location into it */
+        XQueryImplementation xqueryImplementation = null;
+
+        /* Read the location attribute for the XQuery implementation  */
+        String xqueryLocation = reader.getAttributeValue(null, LOCATION);
+        if (xqueryLocation != null) {
+        	xqueryImplementation = XQueryImplementationFactory.INSTANCE.createXQueryImplementation();
+            xqueryImplementation.setLocation(xqueryLocation);
+            xqueryImplementation.setUnresolved(true);
+        } else {        
+        	error("LocationAttributeMissing", reader);
+            //throw new ContributionReadException(MSG_LOCATION_MISSING);
+        }        
+
+        // Skip to end element
+        while (reader.hasNext()) {
+            if (reader.next() == END_ELEMENT && IMPLEMENTATION_XQUERY_QNAME.equals(reader.getName())) {
+                break;
+            }
+        } // end while
+
+        return xqueryImplementation;
+    }
+
+    public void write(XQueryImplementation xqueryImplementation, XMLStreamWriter writer)
+        throws ContributionWriteException, XMLStreamException {
+        
+        writer.writeStartElement(Constants.SCA10_TUSCANY_NS, IMPLEMENTATION_XQUERY);
+        if (xqueryImplementation.getLocation() != null) {
+            writer.writeAttribute(LOCATION, xqueryImplementation.getLocation());
+        }
+        writer.writeEndElement();
+
+    }
+
+    public Class<XQueryImplementation> getModelType() {
+        return XQueryImplementation.class;
+    }
+
+    /**
+     * Resolves the implementation: its services and references, by invoking the XQuery
+     * introspector
+     */
+    public void resolve(XQueryImplementation xqueryImplementation, ModelResolver resolver)
+        throws ContributionResolveException {
+    	
+    	if (xqueryImplementation != null) {
+            Artifact artifact = contributionFactory.createArtifact();
+            artifact.setURI(xqueryImplementation.getLocation());
+    	    artifact = resolver.resolveModel(Artifact.class, artifact);
+    	    if (artifact.getLocation() != null) {
+    	    	xqueryImplementation.setLocationURL(artifact.getLocation());
+    	        
+    	    	XQueryIntrospector introspector = new XQueryIntrospector(assemblyFactory, javaFactory);
+    	        
+    	        boolean success = introspector.introspect(xqueryImplementation, resolver);
+    	        if (success) {
+    	            xqueryImplementation.setUnresolved(false);
+    	        }
+    	    } else {
+    	    	error("CouldNotLocateFile", resolver, xqueryImplementation.getLocation());
+                //throw new ContributionResolveException("Could not locate file: " + xqueryImplementation.getLocation());
+    	    }
+    	}
+    }
+
+}
diff --git a/java/sca/contrib/modules/implementation-xquery/src/main/java/org/apache/tuscany/sca/implementation/xquery/xml/XQueryIntrospector.java b/java/sca/contrib/modules/implementation-xquery/src/main/java/org/apache/tuscany/sca/implementation/xquery/xml/XQueryIntrospector.java
new file mode 100644
index 0000000000..d1e74dd40d
--- /dev/null
+++ b/java/sca/contrib/modules/implementation-xquery/src/main/java/org/apache/tuscany/sca/implementation/xquery/xml/XQueryIntrospector.java
@@ -0,0 +1,328 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.tuscany.sca.implementation.xquery.xml;
+
+import java.io.ByteArrayOutputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.InputStream;
+import java.lang.reflect.Method;
+import java.net.URL;
+import java.util.Iterator;
+
+import javax.xml.namespace.QName;
+
+import net.sf.saxon.Configuration;
+import net.sf.saxon.om.NamespaceResolver;
+import net.sf.saxon.query.StaticQueryContext;
+import net.sf.saxon.query.XQueryExpression;
+import net.sf.saxon.trans.XPathException;
+
+import org.apache.tuscany.sca.assembly.AssemblyFactory;
+import org.apache.tuscany.sca.assembly.Multiplicity;
+import org.apache.tuscany.sca.assembly.Property;
+import org.apache.tuscany.sca.assembly.Reference;
+import org.apache.tuscany.sca.assembly.Service;
+import org.apache.tuscany.sca.contribution.resolver.ClassReference;
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+import org.apache.tuscany.sca.contribution.service.ContributionResolveException;
+import org.apache.tuscany.sca.implementation.xquery.XQueryImplementation;
+import org.apache.tuscany.sca.interfacedef.InvalidInterfaceException;
+import org.apache.tuscany.sca.interfacedef.java.JavaInterface;
+import org.apache.tuscany.sca.interfacedef.java.JavaInterfaceContract;
+import org.apache.tuscany.sca.interfacedef.java.JavaInterfaceFactory;
+import org.apache.tuscany.sca.interfacedef.util.JavaXMLMapper;
+
+/**
+ * This class introspects an XQuery file and extracts out of it
+ * all implemented service, references and properties
+ * It also creates expression extensions for each operation
+ * in the implemented services
+ * @version $Rev$ $Date$
+ */
+public class XQueryIntrospector {
+
+    private static final String SCA_SERVICE_PREFIX = "scaservice:java/";
+    private static final String SCA_REFERENCE_PREFIX = "scareference:java/";
+    private static final String SCA_PROPERTY_JAVA_PREFIX = "scaproperty:java/";
+    private static final String SCA_PROPERTY_XML_PREFIX = "scaproperty:xml/";
+
+    private AssemblyFactory assemblyFactory;
+    private JavaInterfaceFactory javaFactory;
+
+    public XQueryIntrospector(AssemblyFactory assemblyFactory, JavaInterfaceFactory javaFactory) {
+        super();
+        this.assemblyFactory = assemblyFactory;
+        this.javaFactory = javaFactory;
+    }
+
+    public boolean introspect(XQueryImplementation xqueryImplementation, ModelResolver resolver) throws ContributionResolveException {
+        
+        String xqExpression = null;
+        try {
+            URL url = new URL(xqueryImplementation.getLocationURL());
+            xqExpression = loadXQExpression(url);
+        } catch (FileNotFoundException e) {
+            throw new ContributionResolveException(e);
+        } catch (IOException e) {
+            throw new ContributionResolveException(e);
+        }
+
+        if (xqExpression == null) {
+            return false;
+        }
+
+        xqueryImplementation.setXqExpression(xqExpression);
+
+        xqExpression += "\r\n<dummy></dummy>";
+
+        Configuration config = new Configuration();
+        StaticQueryContext sqc = new StaticQueryContext(config);
+        XQueryExpression exp = null;
+        try {
+            exp = sqc.compileQuery(xqExpression);
+        } catch (XPathException e) {
+            throw new ContributionResolveException(e);
+        }
+
+        if (exp == null) {
+            return false;
+        }
+        xqueryImplementation.getCompiledExpressionsCache().put(xqExpression, exp);
+
+        try {
+            introspectServicesAndReferences(xqueryImplementation, exp, resolver);
+        } catch (ClassNotFoundException e) {
+            throw new ContributionResolveException(e);
+        } catch (InvalidInterfaceException e) {
+            throw new ContributionResolveException(e);
+        }
+
+        fillExpressionExtensions(xqueryImplementation);
+
+        return true;
+    }
+
+    /**
+     * Loads the XQuery expression from the location that is provided with the implementation
+     */
+    private String loadXQExpression(URL locationURL) throws FileNotFoundException, IOException {
+    	
+        InputStream xqResourceStream = locationURL.openStream();
+
+        if (xqResourceStream == null) {
+            return null;
+        }
+
+        ByteArrayOutputStream baos = new ByteArrayOutputStream();
+        int i = 0;
+        while ((i = xqResourceStream.read()) >= 0) {
+            baos.write(i);
+        }
+        xqResourceStream.close();
+        baos.flush();
+        baos.close();
+
+        String xqExpression = baos.toString();
+
+        return xqExpression;
+    }
+    
+    private Class<?> resolveClass(ModelResolver resolver, String className) throws ClassNotFoundException {
+        ClassReference classReference = new ClassReference(className);
+        classReference = resolver.resolveModel(ClassReference.class, classReference);
+        Class<?> javaClass = classReference.getJavaClass();
+        if (javaClass == null) {
+            throw new ClassNotFoundException(className);
+        } else {
+            return javaClass;
+        }
+    }
+
+    /**
+     * From the compiled XQuery expression get all namespaces and see if they
+     * are services, references or properties declarations
+     */
+    private void introspectServicesAndReferences(XQueryImplementation xqueryImplementation, XQueryExpression exp, ModelResolver resolver)
+        throws ClassNotFoundException, InvalidInterfaceException {
+        NamespaceResolver namespaceResolver = exp.getStaticContext().getNamespaceResolver();
+        Iterator declaredPrefixesIterator = namespaceResolver.iteratePrefixes();
+        while (declaredPrefixesIterator.hasNext()) {
+            String prefix = (String)declaredPrefixesIterator.next();
+            String uri = namespaceResolver.getURIForPrefix(prefix, false);
+            if (uri.startsWith(SCA_SERVICE_PREFIX)) {
+                String serviceName = prefix;
+                String className = uri.substring(SCA_SERVICE_PREFIX.length());
+                Class<?> interfaze = resolveClass(resolver, className);
+                Service theService = createService(interfaze, serviceName);
+                xqueryImplementation.getServices().add(theService);
+            } else if (uri.startsWith(SCA_REFERENCE_PREFIX)) {
+                String referenceName = prefix;
+                String className = uri.substring(SCA_REFERENCE_PREFIX.length());
+                Class<?> interfaze = resolveClass(resolver, className);
+                Reference theReference = createReference(interfaze, referenceName);
+                xqueryImplementation.getReferences().add(theReference);
+            } else if (uri.startsWith(SCA_PROPERTY_JAVA_PREFIX)) {
+                String propertyName = prefix;
+                String className = uri.substring(SCA_PROPERTY_JAVA_PREFIX.length());
+                Class<?> clazz = resolveClass(resolver, className);
+                QName xmlType = JavaXMLMapper.getXMLType(clazz);
+                Property theProperty = createProperty(xmlType, propertyName);
+                xqueryImplementation.getProperties().add(theProperty);
+            } else if (uri.startsWith(SCA_PROPERTY_XML_PREFIX)) {
+                String propertyName = prefix;
+                String namespaceAndLocalname = uri.substring(SCA_PROPERTY_XML_PREFIX.length());
+                int localNameDelimiterPostition = namespaceAndLocalname.lastIndexOf(':');
+                String localName = null;
+                String namespace = null;
+                if (localNameDelimiterPostition < 0) {
+                    localName = namespaceAndLocalname;
+                    namespace = "";
+                } else {
+                    namespace = namespaceAndLocalname.substring(0, localNameDelimiterPostition);
+                    localName = namespaceAndLocalname.substring(localNameDelimiterPostition + 1);
+                }
+                QName xmlType = new QName(namespace, localName);
+                Property theProperty = createProperty(xmlType, propertyName);
+                xqueryImplementation.getProperties().add(theProperty);
+            }
+        }
+    }
+
+    /**
+     * Creates a Service for the component type based on its name and Java interface
+     */
+    private Service createService(Class<?> interfaze, String name) throws InvalidInterfaceException {
+        Service service = assemblyFactory.createService();
+        JavaInterfaceContract interfaceContract = javaFactory.createJavaInterfaceContract();
+        service.setInterfaceContract(interfaceContract);
+
+        // Set the name for the service
+        service.setName(name);
+
+        // Set the call interface and, if present, the callback interface
+        JavaInterface callInterface = null;
+        try {
+            callInterface = (JavaInterface) javaFactory.createJavaInterface(interfaze).clone();
+        } catch (CloneNotSupportedException e) {
+            // Ignore
+        }
+        //setDataBindingForInterface(callInterface, DataObject.class.getName());
+        service.getInterfaceContract().setInterface(callInterface);
+        if (callInterface.getCallbackClass() != null) {
+            JavaInterface callbackInterface = null;
+            try {
+                callbackInterface = (JavaInterface) javaFactory.createJavaInterface(callInterface.getCallbackClass()).clone();
+            } catch (CloneNotSupportedException e) {
+                //Ignore
+            }
+            //setDataBindingForInterface(callbackInterface, DataObject.class.getName());
+            service.getInterfaceContract().setCallbackInterface(callbackInterface);
+        }
+        return service;
+    } // end method createService
+
+    protected Property createProperty(QName type, String name) {
+
+        Property property = assemblyFactory.createProperty();
+        property.setName(name);
+        property.setXSDType(type);
+
+        property.setMany(false);
+        return property;
+
+    }
+
+    /**
+     * Creates a Reference for the component type based on its name and Java interface
+     */
+    private Reference createReference(Class<?> interfaze, String name) throws InvalidInterfaceException {
+        Reference reference = assemblyFactory.createReference();
+        JavaInterfaceContract interfaceContract = javaFactory.createJavaInterfaceContract();
+        reference.setInterfaceContract(interfaceContract);
+
+        // Set the name of the reference to the supplied name and the multiplicity of the reference
+        // to 1..1 - for XQuery implementations, this is the only multiplicity supported
+        reference.setName(name);
+        reference.setMultiplicity(Multiplicity.ONE_ONE);
+
+        // Set the call interface and, if present, the callback interface
+        // Set the call interface and, if present, the callback interface
+        JavaInterface callInterface = null;
+        try {
+            callInterface = (JavaInterface) javaFactory.createJavaInterface(interfaze).clone();
+        } catch (CloneNotSupportedException e) {
+            // Ignore
+        }
+        reference.getInterfaceContract().setInterface(callInterface);
+        if (callInterface.getCallbackClass() != null) {
+            JavaInterface callbackInterface = null;
+            try {
+                callbackInterface = (JavaInterface) javaFactory.createJavaInterface(callInterface.getCallbackClass()).clone();
+            } catch (CloneNotSupportedException e) {
+                //Ignore
+            }
+            reference.getInterfaceContract().setCallbackInterface(callbackInterface);
+        }
+
+        return reference;
+    }
+
+    /**
+     * For the methods of each implemented service corresponding expression extension
+     * is generated
+     * @param xqueryImplementation
+     */
+    private void fillExpressionExtensions(XQueryImplementation xqueryImplementation) {
+        for (Service service : xqueryImplementation.getServices()) {
+            Class<?> interfaze = ((JavaInterface)service.getInterfaceContract().getInterface()).getJavaClass();
+
+            // For each of the methods
+            for (Method method : interfaze.getMethods()) {
+                String expressionExtension = createExpressionExtension(method, interfaze, service.getName());
+                xqueryImplementation.getXqExpressionExtensionsMap().put(method, expressionExtension);
+            }
+        }
+    }
+
+    private String createExpressionExtension(Method method, Class<?> interfaze, String serviceName) {
+        StringBuffer exprBuf = new StringBuffer();
+
+        exprBuf.append("\r\n");
+
+        String methodName = method.getName();
+
+        // For each of the declared parameters
+        for (int i = 0; i < method.getParameterTypes().length; i++) {
+            exprBuf.append("declare variable $" + methodName + "_" + i + " external;\r\n");
+        }
+
+        exprBuf.append(serviceName + ":" + methodName + "(");
+
+        for (int i = 0; i < method.getParameterTypes().length; i++) {
+            exprBuf.append("$" + methodName + "_" + i);
+            if (i != method.getParameterTypes().length - 1) {
+                exprBuf.append(", ");
+            }
+        }
+        exprBuf.append(")");
+
+        return exprBuf.toString();
+    }
+}
diff --git a/java/sca/contrib/modules/implementation-xquery/src/main/resources/META-INF/services/org.apache.tuscany.sca.contribution.processor.StAXArtifactProcessor b/java/sca/contrib/modules/implementation-xquery/src/main/resources/META-INF/services/org.apache.tuscany.sca.contribution.processor.StAXArtifactProcessor
new file mode 100644
index 0000000000..a51995e56d
--- /dev/null
+++ b/java/sca/contrib/modules/implementation-xquery/src/main/resources/META-INF/services/org.apache.tuscany.sca.contribution.processor.StAXArtifactProcessor
@@ -0,0 +1,19 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+# 
+#   http://www.apache.org/licenses/LICENSE-2.0
+# 
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License. 
+
+# Implementation class for the artifact processor extension
+org.apache.tuscany.sca.implementation.xquery.xml.XQueryImplementationProcessor;qname=http://tuscany.apache.org/xmlns/sca/1.0#implementation.xquery,model=org.apache.tuscany.sca.implementation.xquery.XQueryImplementation
diff --git a/java/sca/contrib/modules/implementation-xquery/src/main/resources/META-INF/services/org.apache.tuscany.sca.provider.ImplementationProviderFactory b/java/sca/contrib/modules/implementation-xquery/src/main/resources/META-INF/services/org.apache.tuscany.sca.provider.ImplementationProviderFactory
new file mode 100644
index 0000000000..7ccc08d1ee
--- /dev/null
+++ b/java/sca/contrib/modules/implementation-xquery/src/main/resources/META-INF/services/org.apache.tuscany.sca.provider.ImplementationProviderFactory
@@ -0,0 +1,19 @@
+# Licensed to the Apache Software Foundation (ASF) under one

+# or more contributor license agreements.  See the NOTICE file

+# distributed with this work for additional information

+# regarding copyright ownership.  The ASF licenses this file

+# to you under the Apache License, Version 2.0 (the

+# "License"); you may not use this file except in compliance

+# with the License.  You may obtain a copy of the License at

+# 

+#   http://www.apache.org/licenses/LICENSE-2.0

+# 

+# Unless required by applicable law or agreed to in writing,

+# software distributed under the License is distributed on an

+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

+# KIND, either express or implied.  See the License for the

+# specific language governing permissions and limitations

+# under the License. 

+

+# Implementation class for the implementation extension

+org.apache.tuscany.sca.implementation.xquery.XQueryImplementationProviderFactory;model=org.apache.tuscany.sca.implementation.xquery.XQueryImplementation

diff --git a/java/sca/contrib/modules/implementation-xquery/src/main/resources/impl-xquery-validation-messages.properties b/java/sca/contrib/modules/implementation-xquery/src/main/resources/impl-xquery-validation-messages.properties
new file mode 100644
index 0000000000..33c605de27
--- /dev/null
+++ b/java/sca/contrib/modules/implementation-xquery/src/main/resources/impl-xquery-validation-messages.properties
@@ -0,0 +1,22 @@
+#
+#
+#    Licensed to the Apache Software Foundation (ASF) under one
+#    or more contributor license agreements. See the NOTICE file
+#    distributed with this work for additional information
+#    regarding copyright ownership. The ASF licenses this file
+#    to you under the Apache License, Version 2.0 (the
+#    "License"); you may not use this file except in compliance
+#    with the License. You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing,
+#    software distributed under the License is distributed on an
+#    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+#    KIND, either express or implied. See the License for the
+#    specific language governing permissions and limitations
+#    under the License.
+#
+#
+CouldNotLocateFile = Could not locate file: {0}
+LocationAttributeMissing = Reading implementation.xquery - location attribute missing
\ No newline at end of file