Moving 1.x tags

git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@835157 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 188 insertions, 0 deletions

diff --git a/sca-java-1.x/tags/1.1/modules/core-databinding/src/main/java/org/apache/tuscany/sca/core/databinding/wire/PassByValueInterceptor.java b/sca-java-1.x/tags/1.1/modules/core-databinding/src/main/java/org/apache/tuscany/sca/core/databinding/wire/PassByValueInterceptor.java
new file mode 100644
index 0000000000..0e3f3947ec
--- /dev/null
+++ b/sca-java-1.x/tags/1.1/modules/core-databinding/src/main/java/org/apache/tuscany/sca/core/databinding/wire/PassByValueInterceptor.java
@@ -0,0 +1,188 @@
+/*
+ * 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.core.databinding.wire;
+
+import java.io.Serializable;
+import java.lang.reflect.Array;
+import java.util.IdentityHashMap;
+import java.util.List;
+import java.util.Map;
+
+import org.apache.tuscany.sca.databinding.DataBinding;
+import org.apache.tuscany.sca.databinding.DataBindingExtensionPoint;
+import org.apache.tuscany.sca.databinding.javabeans.JavaBeansDataBinding;
+import org.apache.tuscany.sca.databinding.jaxb.JAXBDataBinding;
+import org.apache.tuscany.sca.interfacedef.DataType;
+import org.apache.tuscany.sca.interfacedef.Operation;
+import org.apache.tuscany.sca.invocation.Interceptor;
+import org.apache.tuscany.sca.invocation.Invoker;
+import org.apache.tuscany.sca.invocation.Message;
+
+/**
+ * Implementation of an interceptor that enforces pass-by-value semantics
+ * on operation invocations by copying the operation input and output data.
+ *
+ * @version $Rev$ $Date$
+ */
+public class PassByValueInterceptor implements Interceptor {
+
+    private DataBindingExtensionPoint dataBindings;
+    private DataBinding[] inputDataBindings;
+    private DataBinding outputDataBinding;
+    private DataBinding javaBeanDataBinding;
+    private DataBinding jaxbDataBinding;
+    private Operation operation;
+    private Invoker nextInvoker;
+
+    /**
+     * Constructs a new PassByValueInterceptor.
+     * @param dataBindings databinding extension point
+     * @param operation the intercepted operation
+     */
+    public PassByValueInterceptor(DataBindingExtensionPoint dataBindings, Operation operation) {
+        this.operation = operation;
+        
+        // Cache data bindings to use
+        this.dataBindings = dataBindings;
+        jaxbDataBinding = dataBindings.getDataBinding(JAXBDataBinding.NAME);
+        javaBeanDataBinding = dataBindings.getDataBinding(JavaBeansDataBinding.NAME);
+        
+        // Determine the input databindings
+        if (operation.getInputType() != null) {
+            List<DataType> inputTypes = operation.getInputType().getLogical();
+            inputDataBindings = new DataBinding[inputTypes.size()];
+            int i = 0;
+            for (DataType inputType: inputTypes) {
+                String id = inputType.getDataBinding(); 
+                inputDataBindings[i++] = dataBindings.getDataBinding(id);
+            }
+        }
+        
+        // Determine the output databinding
+        if (operation.getOutputType() != null) {
+            String id = operation.getOutputType().getDataBinding();
+            outputDataBinding = dataBindings.getDataBinding(id);
+        }
+    }
+
+    public Message invoke(Message msg) {
+        msg.setBody(copy((Object[])msg.getBody(), inputDataBindings));
+
+        Message resultMsg = nextInvoker.invoke(msg);
+
+        if (!msg.isFault() && operation.getOutputType() != null) {
+            resultMsg.setBody(copy(resultMsg.getBody(), outputDataBinding));
+        }
+        return resultMsg;
+    }
+
+    /**
+     * Copy an array of data objects passed to an operation
+     * @param data array of objects to copy
+     * @return the copy
+     */
+    private Object[] copy(Object[] data, DataBinding[] dataBindings) {
+        if (data == null) {
+            return null;
+        }
+        Object[] copy = new Object[data.length];
+        Map<Object, Object> map = new IdentityHashMap<Object, Object>();
+        for (int i = 0; i < data.length; i++) {
+            Object arg = data[i];
+            if (arg == null) {
+                copy[i] = null;
+            } else {
+                Object copiedArg = map.get(arg);
+                if (copiedArg != null) {
+                    copy[i] = copiedArg;
+                } else {
+                    copiedArg = copy(arg, dataBindings[i]);
+                    map.put(arg, copiedArg);
+                    copy[i] = copiedArg;
+                }
+            }
+        }
+        return copy;
+    }
+
+    /**
+     * Copy data using the specified databinding.
+     * @param data input data
+     * @param dataBinding databinding to use
+     * @return a copy of the data
+     */
+    private Object copy(Object data, DataBinding dataBinding) {
+        if (data == null) {
+            return null;
+        }
+
+        // If no databinding was specified, introspect the given arg to
+        // determine its databinding
+        if (dataBinding == null) {
+            DataType<?> dataType = dataBindings.introspectType(data);
+            if (dataType != null) {
+                String db = dataType.getDataBinding();
+                dataBinding = dataBindings.getDataBinding(db);
+                if (dataBinding == null && db != null) {
+                    return data;
+                }
+            }
+            if (dataBinding == null) {
+                
+                // Default to the JavaBean databinding
+                dataBinding = javaBeanDataBinding;            
+            }
+        }
+        
+        // Use the JAXB databinding to copy non-Serializable data
+        if (dataBinding == javaBeanDataBinding) {
+            
+            // If the input data is an array containing non serializable elements
+            // use JAXB
+            Class<?> clazz = data.getClass();
+            if (clazz.isArray()) {
+                if (Array.getLength(data) != 0) {
+                    Object element = Array.get(data, 0);
+                    if (element != null && !(element instanceof Serializable)) {
+                        dataBinding = jaxbDataBinding;
+                    }
+                }
+            } else {
+
+                // If the input data is not serializable use JAXB
+                if (!(data instanceof Serializable)) {
+                    dataBinding = jaxbDataBinding;
+                }
+            }
+        }
+        
+        Object copy = dataBinding.copy(data);
+        return copy;
+    }
+
+    public Invoker getNext() {
+        return nextInvoker;
+    }
+
+    public void setNext(Invoker next) {
+        this.nextInvoker = next;
+    }
+
+}