1 files changed, 107 insertions, 0 deletions
diff --git a/sandbox/rfeng/minicore/src/main/java/org/apache/tuscany/core/loader/ReferenceLoader.java b/sandbox/rfeng/minicore/src/main/java/org/apache/tuscany/core/loader/ReferenceLoader.java
new file mode 100644
index 0000000000..54183d1c72
--- /dev/null
+++ b/sandbox/rfeng/minicore/src/main/java/org/apache/tuscany/core/loader/ReferenceLoader.java
@@ -0,0 +1,107 @@
+/*
+ * 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.core.loader;
+
+import java.util.HashMap;
+import java.util.Map;
+import javax.xml.namespace.QName;
+import static javax.xml.stream.XMLStreamConstants.END_ELEMENT;
+import static javax.xml.stream.XMLStreamConstants.START_ELEMENT;
+import javax.xml.stream.XMLStreamException;
+import javax.xml.stream.XMLStreamReader;
+
+import static org.osoa.sca.Constants.SCA_NS;
+import org.osoa.sca.annotations.Constructor;
+import org.osoa.sca.annotations.Reference;
+
+import org.apache.tuscany.spi.deployer.DeploymentContext;
+import org.apache.tuscany.spi.extension.LoaderExtension;
+import org.apache.tuscany.spi.loader.LoaderException;
+import org.apache.tuscany.spi.loader.LoaderRegistry;
+import org.apache.tuscany.spi.loader.UnrecognizedElementException;
+import org.apache.tuscany.spi.model.BindingDefinition;
+import org.apache.tuscany.spi.model.ModelObject;
+import org.apache.tuscany.spi.model.Multiplicity;
+import org.apache.tuscany.spi.model.ReferenceDefinition;
+import org.apache.tuscany.spi.model.ServiceContract;
+
+/**
+ * Loads a reference from an XML-based assembly file
+ *
+ * @version $Rev$ $Date$
+ */
+public class ReferenceLoader extends LoaderExtension<ReferenceDefinition> {
+    public static final QName REFERENCE = new QName(SCA_NS, "reference");
+    private static final Map<String, Multiplicity> MULTIPLICITY = new HashMap<String, Multiplicity>(4);
+
+    static {
+        MULTIPLICITY.put("0..1", Multiplicity.ZERO_ONE);
+        MULTIPLICITY.put("1..1", Multiplicity.ONE_ONE);
+        MULTIPLICITY.put("0..n", Multiplicity.ZERO_N);
+        MULTIPLICITY.put("1..n", Multiplicity.ONE_N);
+    }
+
+    @Constructor
+    public ReferenceLoader(@Reference LoaderRegistry registry) {
+        super(registry);
+    }
+
+    public QName getXMLType() {
+        return REFERENCE;
+    }
+
+    public ReferenceDefinition load(ModelObject object, XMLStreamReader reader, DeploymentContext context)
+        throws XMLStreamException, LoaderException {
+        assert REFERENCE.equals(reader.getName());
+        String name = reader.getAttributeValue(null, "name");
+        String multiplicityVal = reader.getAttributeValue(null, "multiplicity");
+        Multiplicity multiplicity = multiplicity(multiplicityVal, Multiplicity.ONE_ONE);
+        ReferenceDefinition referenceDefinition = new ReferenceDefinition();
+        referenceDefinition.setMultiplicity(multiplicity);
+        referenceDefinition.setUri(context.getComponentId().resolve('#' + name));
+        while (true) {
+            switch (reader.next()) {
+                case START_ELEMENT:
+                    ModelObject o = registry.load(null, reader, context);
+                    if (o instanceof ServiceContract) {
+                        referenceDefinition.setServiceContract((ServiceContract) o);
+                    } else if (o instanceof BindingDefinition) {
+                        referenceDefinition.addBinding((BindingDefinition) o);
+                    } else {
+                        throw new UnrecognizedElementException(reader.getName());
+                    }
+                    break;
+                case END_ELEMENT:
+                    return referenceDefinition;
+            }
+        }
+    }
+
+    /**
+     * Convert a "multiplicity" attribute to the equivalent enum value.
+     *
+     * @param multiplicity the attribute to convert
+     * @param def          the default value
+     * @return the enum equivalent
+     */
+    private static Multiplicity multiplicity(String multiplicity, Multiplicity def) {
+        return multiplicity == null ? def : MULTIPLICITY.get(multiplicity);
+    }
+
+}