1 files changed, 109 insertions, 0 deletions
diff --git a/tags/java/sca/2.0-M3-RC3a/modules/core-databinding/src/main/java/org/apache/tuscany/sca/core/databinding/wire/DataTransformationInterceptor.java b/tags/java/sca/2.0-M3-RC3a/modules/core-databinding/src/main/java/org/apache/tuscany/sca/core/databinding/wire/DataTransformationInterceptor.java
new file mode 100644
index 0000000000..679897b59b
--- /dev/null
+++ b/tags/java/sca/2.0-M3-RC3a/modules/core-databinding/src/main/java/org/apache/tuscany/sca/core/databinding/wire/DataTransformationInterceptor.java
@@ -0,0 +1,109 @@
+/*
+ * 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.lang.reflect.InvocationTargetException;
+import java.util.HashMap;
+import java.util.Map;
+
+import org.apache.tuscany.sca.databinding.Mediator;
+import org.apache.tuscany.sca.interfacedef.Operation;
+import org.apache.tuscany.sca.interfacedef.impl.DataTypeImpl;
+import org.apache.tuscany.sca.interfacedef.util.FaultException;
+import org.apache.tuscany.sca.interfacedef.util.XMLType;
+import org.apache.tuscany.sca.invocation.DataExchangeSemantics;
+import org.apache.tuscany.sca.invocation.Interceptor;
+import org.apache.tuscany.sca.invocation.Invoker;
+import org.apache.tuscany.sca.invocation.Message;
+import org.apache.tuscany.sca.runtime.RuntimeWire;
+import org.oasisopen.sca.ServiceRuntimeException;
+
+/**
+ * An interceptor to transform data across databindings on the wire
+ * 
+ * @version $Rev$ $Date$
+ */
+public class DataTransformationInterceptor implements Interceptor, DataExchangeSemantics {
+    private Invoker next;
+
+    private Operation sourceOperation;
+
+    private Operation targetOperation;
+    private RuntimeWire wire;
+    private Mediator mediator;
+
+    public DataTransformationInterceptor(RuntimeWire wire,
+                                         Operation sourceOperation,
+                                         Operation targetOperation,
+                                         Mediator mediator) {
+        super();
+        this.sourceOperation = sourceOperation;
+        this.targetOperation = targetOperation;
+        this.mediator = mediator;
+        this.wire = wire;
+    }
+
+    public Invoker getNext() {
+        return next;
+    }
+
+    public Message invoke(Message msg) {
+        Map<String, Object> metadata = new HashMap<String, Object>();
+        metadata.put("wire", wire);
+        Object input = mediator.mediateInput(msg.getBody(), sourceOperation, targetOperation, metadata);
+        msg.setBody(input);
+        Message resultMsg = next.invoke(msg);
+        Object result = resultMsg.getBody();
+        if (sourceOperation.isNonBlocking()) {
+            // Not to reset the message body
+            return resultMsg;
+        }
+
+
+        if (resultMsg.isFault()) {
+            Object transformedFault = null;
+            if ((result instanceof Exception) && !(result instanceof RuntimeException)) {
+                transformedFault = mediator.mediateFault(result, sourceOperation, targetOperation, metadata);
+                if (transformedFault != result) {
+                    resultMsg.setFaultBody(transformedFault);
+                }
+            }
+            //
+            // Leave it to another layer to actually throw the Exception which constitutes
+            // the message body.  We don't throw it here.
+            //
+        } else {
+            assert !(result instanceof Throwable) : "Expected messages that are not throwable " + result;
+            Object newResult = mediator.mediateOutput(result, sourceOperation, targetOperation, metadata);
+            resultMsg.setBody(newResult);
+        }
+
+        return resultMsg;
+    }
+
+    public void setNext(Invoker next) {
+        this.next = next;
+    }
+
+    public boolean allowsPassByReference() {
+        return true;
+    }
+
+}