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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.InvocationTargetException;
import java.util.HashMap;
import java.util.Map;
import javax.xml.namespace.QName;
import org.apache.tuscany.sca.databinding.DataBinding;
import org.apache.tuscany.sca.databinding.Mediator;
import org.apache.tuscany.sca.interfacedef.DataType;
import org.apache.tuscany.sca.interfacedef.FaultExceptionMapper;
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.osoa.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;
private FaultExceptionMapper faultExceptionMapper;
private FaultTransformHelper faultTransformHelper;
public DataTransformationInterceptor(RuntimeWire wire,
Operation sourceOperation,
Operation targetOperation,
Mediator mediator,
FaultExceptionMapper faultExceptionMapper) {
super();
this.sourceOperation = sourceOperation;
this.targetOperation = targetOperation;
this.mediator = mediator;
this.wire = wire;
this.faultExceptionMapper = faultExceptionMapper;
this.faultTransformHelper = new FaultTransformHelper(mediator);
}
public Invoker getNext() {
return next;
}
public Message invoke(Message msg) {
Object input = transform(msg.getBody(), sourceOperation.getInputType(), targetOperation.getInputType(), false);
msg.setBody(input);
Message resultMsg = next.invoke(msg);
Object result = resultMsg.getBody();
if (sourceOperation.isNonBlocking()) {
// Not to reset the message body
return resultMsg;
}
// FIXME: Should we fix the Operation model so that getOutputType
// returns DataType<DataType<T>>?
DataType<DataType> targetType =
new DataTypeImpl<DataType>(DataBinding.IDL_OUTPUT, Object.class, targetOperation.getOutputType());
DataType<DataType> sourceType =
new DataTypeImpl<DataType>(DataBinding.IDL_OUTPUT, Object.class, sourceOperation.getOutputType());
if (resultMsg.isFault()) {
Object transformedFault = null;
if ((result instanceof Exception) && !(result instanceof RuntimeException)) {
transformedFault = faultTransformHelper.transformFault(result, sourceOperation, targetOperation, wire);
}
// Otherwise, we leave it to another layer to actually throw the RuntimeException which constitutes
// the message body. We don't throw it here.
if (transformedFault != result) {
resultMsg.setFaultBody(transformedFault);
}
} else {
assert !(result instanceof Throwable) : "Expected messages that are not throwable " + result;
Object newResult = transform(result, targetType, sourceType, true);
resultMsg.setBody(newResult);
}
return resultMsg;
}
private Object transform(Object source, DataType sourceType, DataType targetType, boolean isResponse) {
if (sourceType == targetType || (sourceType != null && sourceType.equals(targetType))) {
return source;
}
Map<String, Object> metadata = new HashMap<String, Object>();
metadata.put("source.operation", isResponse ? targetOperation : sourceOperation);
metadata.put("target.operation", isResponse ? sourceOperation : targetOperation);
metadata.put("wire", wire);
return mediator.mediate(source, sourceType, targetType, metadata);
}
public void setNext(Invoker next) {
this.next = next;
}
public boolean allowsPassByReference() {
return true;
}
}
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