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/*
* 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.Method;
import java.lang.reflect.Type;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.tuscany.sca.databinding.Mediator;
import org.apache.tuscany.sca.interfacedef.DataType;
import org.apache.tuscany.sca.interfacedef.Operation;
import org.apache.tuscany.sca.interfacedef.java.JavaOperation;
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;
if ( sourceOperation instanceof JavaOperation ) {
JavaOperation javaOp = (JavaOperation) sourceOperation;
Method sourceMethod = javaOp.getJavaMethod();
}
// Holder pattern. In order to perform data mediation on Holder return types, it is
// necessary to set up a data transformation on the Holder<T> class T. on return.
DataType<DataType> returnTargetType = getFirstHolderType( sourceOperation.getInputType() );
if ( returnTargetType != null ) {
this.sourceOperation.setOutputType(returnTargetType);
}
returnTargetType = getFirstHolderType( targetOperation.getInputType() );
if ( returnTargetType != null ) {
this.targetOperation.setOutputType(returnTargetType);
}
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);
if (sourceOperation.isNonBlocking()) {
// Not to reset the message body
return resultMsg;
}
Object result = resultMsg.getBody();
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;
}
/**
* Returns return type for first Holder in input list.
* Returns null if the inputs do not contain a Holder.
*/
protected static DataType<DataType> getFirstHolderType( DataType<List<DataType>> inputTypes ) {
if (inputTypes != null) {
List<DataType> logicalType = inputTypes.getLogical();
if (logicalType != null) {
for (int i = 0; i < logicalType.size(); i++) {
DataType dataType = logicalType.get(i);
if (isHolder(dataType.getGenericType())) {
// Fix up output from void to returned data type.
// System.out.println("DataTransformationInterceptor.<> source input[" + i + "] is Holder, logicalType=" + dataType);
return dataType;
}
}
}
}
return null;
}
protected static boolean isHolder( Type type ) {
String typeString = type.toString();
if ( typeString.startsWith( "javax.xml.ws.Holder" ) ) {
return true;
}
return false;
}
}
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