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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.transformers;
import java.util.List;
import org.apache.tuscany.sca.databinding.DataBinding;
import org.apache.tuscany.sca.databinding.Mediator;
import org.apache.tuscany.sca.databinding.PullTransformer;
import org.apache.tuscany.sca.databinding.TransformationContext;
import org.apache.tuscany.sca.databinding.TransformationException;
import org.apache.tuscany.sca.databinding.WrapperHandler;
import org.apache.tuscany.sca.databinding.impl.BaseTransformer;
import org.apache.tuscany.sca.interfacedef.DataType;
import org.apache.tuscany.sca.interfacedef.Operation;
import org.apache.tuscany.sca.interfacedef.util.ElementInfo;
import org.apache.tuscany.sca.interfacedef.util.WrapperInfo;
import org.apache.tuscany.sca.interfacedef.util.XMLType;
import org.osoa.sca.annotations.Reference;
/**
* This is a special transformer to transform the output from one IDL to the
* other one
*
* @version $Rev$ $Date$
*/
public class Output2OutputTransformer extends BaseTransformer<Object, Object> implements
PullTransformer<Object, Object> {
protected Mediator mediator;
/**
* @param wrapperHandler
*/
public Output2OutputTransformer() {
super();
}
/**
* @param mediator the mediator to set
*/
@Reference
public void setMediator(Mediator mediator) {
this.mediator = mediator;
}
@Override
public String getSourceDataBinding() {
return DataBinding.IDL_OUTPUT;
}
@Override
public String getTargetDataBinding() {
return DataBinding.IDL_OUTPUT;
}
/**
* @see org.apache.tuscany.sca.databinding.impl.BaseTransformer#getSourceType()
*/
@Override
protected Class<Object> getSourceType() {
return Object.class;
}
/**
* @see org.apache.tuscany.sca.databinding.impl.BaseTransformer#getTargetType()
*/
@Override
protected Class<Object> getTargetType() {
return Object.class;
}
/**
* @see org.apache.tuscany.sca.databinding.Transformer#getWeight()
*/
@Override
public int getWeight() {
return 10;
}
private String getDataBinding(Operation operation) {
WrapperInfo wrapper = operation.getOutputWrapper();
if (wrapper != null) {
return wrapper.getDataBinding();
} else {
return null;
}
}
private WrapperHandler getWrapperHandler(String dataBindingId, boolean required) {
WrapperHandler wrapperHandler = null;
if (dataBindingId != null) {
DataBinding dataBinding = mediator.getDataBindings().getDataBinding(dataBindingId);
wrapperHandler = dataBinding == null ? null : dataBinding.getWrapperHandler();
}
if (wrapperHandler == null && required) {
throw new TransformationException("No wrapper handler is provided for databinding: " + dataBindingId);
}
return wrapperHandler;
}
/**
* Match the structure of the wrapper element. If it matches, then we can do
* wrapper to wrapper transformation. Otherwise, we do child to child.
* @param w1
* @param w2
* @return
*/
private boolean matches(WrapperInfo w1, WrapperInfo w2) {
if (w1 == null || w2 == null) {
return false;
}
if (!w1.getWrapperElement().equals(w2.getWrapperElement())) {
return false;
}
// Compare the child elements
List<ElementInfo> list1 = w1.getChildElements();
List<ElementInfo> list2 = w2.getChildElements();
if (list1.size() != list2.size()) {
return false;
}
// FXIME: [rfeng] At this point, the J2W generates local elments under the namespace
// of the interface instead of "". We only compare the local parts only to work around
// the namespace mismatch
for (int i = 0; i < list1.size(); i++) {
String n1 = list1.get(i).getQName().getLocalPart();
String n2 = list2.get(i).getQName().getLocalPart();
if (!n1.equals(n2)) {
return false;
}
}
return true;
}
@SuppressWarnings("unchecked")
public Object transform(Object response, TransformationContext context) {
try {
DataType<DataType> sourceType = context.getSourceDataType();
Operation sourceOp = context.getSourceOperation();
boolean sourceWrapped = sourceOp != null && sourceOp.isOutputWrapperStyle() && sourceOp.getOutputWrapper() != null;
boolean sourceBare = sourceOp != null && !sourceOp.isOutputWrapperStyle() && sourceOp.getOutputWrapper() == null;
WrapperHandler sourceWrapperHandler = null;
String sourceDataBinding = getDataBinding(sourceOp);
sourceWrapperHandler = getWrapperHandler(sourceDataBinding, sourceWrapped);
DataType<DataType> targetType = context.getTargetDataType();
Operation targetOp = (Operation)context.getTargetOperation();
boolean targetWrapped = targetOp != null && targetOp.isOutputWrapperStyle() && targetOp.getOutputWrapper() != null;
boolean targetBare = targetOp != null && !targetOp.isOutputWrapperStyle() && targetOp.getOutputWrapper() == null;
WrapperHandler targetWrapperHandler = null;
String targetDataBinding = getDataBinding(targetOp);
targetWrapperHandler = getWrapperHandler(targetDataBinding, targetWrapped);
if ((!sourceWrapped &&!sourceBare) && targetWrapped) {
// Unwrapped --> Wrapped
WrapperInfo wrapper = targetOp.getOutputWrapper();
ElementInfo wrapperElement = wrapper.getWrapperElement();
List<ElementInfo> childElements = wrapper.getChildElements();
Class<?> targetWrapperClass = wrapper != null ? wrapper.getWrapperClass() : null;
// If the source can be wrapped, wrapped it first
if (sourceWrapperHandler != null) {
WrapperInfo sourceWrapperInfo = sourceOp.getOutputWrapper();
DataType sourceWrapperType =
sourceWrapperInfo != null ? sourceWrapperInfo.getWrapperType() : null;
if (sourceWrapperType != null && matches(sourceOp.getOutputWrapper(), targetOp.getOutputWrapper())) {
Class<?> sourceWrapperClass = sourceWrapperType.getPhysical();
Object sourceWrapper = sourceWrapperHandler.create(sourceOp, false);
if (sourceWrapper != null) {
if (!childElements.isEmpty()) {
// Set the return value
sourceWrapperHandler.setChildren(sourceWrapper,
new Object[] {response},
sourceOp,
false);
}
Object targetWrapper =
mediator.mediate(sourceWrapper, sourceWrapperType, targetType.getLogical(), context
.getMetadata());
return targetWrapper;
}
}
}
Object targetWrapper = targetWrapperHandler.create(targetOp, false);
if (childElements.isEmpty()) {
// void output
return targetWrapper;
}
DataType<XMLType> argType = wrapper.getUnwrappedOutputType();
Object child = response;
child = mediator.mediate(response, sourceType.getLogical(), argType, context.getMetadata());
targetWrapperHandler.setChildren(targetWrapper, new Object[] {child}, targetOp, false);
return targetWrapper;
} else if (sourceWrapped && (!targetWrapped && !targetBare)) {
// Wrapped to Unwrapped
Object sourceWrapper = response;
List<ElementInfo> childElements = sourceOp.getOutputWrapper().getChildElements();
if (childElements.isEmpty()) {
// The void output
return null;
}
if (targetWrapperHandler != null) {
ElementInfo wrapperElement = sourceOp.getOutputWrapper().getWrapperElement();
// FIXME: This is a workaround for the wsdless support as it passes in child elements
// under the wrapper that only matches by position
if (sourceWrapperHandler.isInstance(sourceWrapper, sourceOp, false)) {
WrapperInfo targetWrapperInfo = targetOp.getOutputWrapper();
DataType targetWrapperType =
targetWrapperInfo != null ? targetWrapperInfo.getWrapperType() : null;
if (targetWrapperType != null && matches(sourceOp.getOutputWrapper(), targetOp.getOutputWrapper())) {
Object targetWrapper =
mediator.mediate(sourceWrapper, sourceType.getLogical(), targetWrapperType, context
.getMetadata());
return targetWrapperHandler.getChildren(targetWrapper, targetOp, false).get(0);
}
}
}
Object child = sourceWrapperHandler.getChildren(sourceWrapper, sourceOp, false).get(0);
DataType<?> childType = sourceOp.getOutputWrapper().getUnwrappedOutputType();
return mediator.mediate(child, childType, targetType.getLogical(), context.getMetadata());
} else {
// FIXME: Do we want to handle wrapped to wrapped?
return mediator.mediate(response, sourceType.getLogical(), targetType.getLogical(), context
.getMetadata());
}
} catch (Exception e) {
throw new TransformationException(e);
}
}
}
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