| /* |
| * 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.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.invocation.Interceptor; |
| import org.apache.tuscany.sca.invocation.Invoker; |
| import org.apache.tuscany.sca.invocation.Message; |
| import org.apache.tuscany.sca.runtime.Invocable; |
| |
| /** |
| * An interceptor to transform data across databindings on the wire |
| * |
| * @version $Rev$ $Date$ |
| */ |
| public class DataTransformationInterceptor implements Interceptor { |
| private Invoker next; |
| |
| private Operation sourceOperation; |
| |
| private Operation targetOperation; |
| private Invocable invocable; |
| private Mediator mediator; |
| |
| public DataTransformationInterceptor(Invocable invocable, |
| Operation sourceOperation, |
| Operation targetOperation, |
| Mediator mediator) { |
| super(); |
| this.sourceOperation = sourceOperation; |
| this.targetOperation = targetOperation; |
| this.mediator = mediator; |
| this.invocable = invocable; |
| } |
| |
| public Invoker getNext() { |
| return next; |
| } |
| |
| public Message invoke(Message msg) { |
| Map<String, Object> metadata = new HashMap<String, Object>(); |
| metadata.put(Invocable.class.getName(), invocable); |
| 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; |
| } |
| |
| } |