/*
* 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 java.util.logging.Logger;
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 input from one IDL to the
* other one
*
* @version $Rev: 666795 $ $Date: 2008-06-11 20:16:36 +0100 (Wed, 11 Jun 2008) $
*/
public class Input2InputTransformer extends BaseTransformer<Object[], Object[]> implements
PullTransformer<Object[], Object[]> {
private static final Logger logger = Logger.getLogger(Input2InputTransformer.class.getName());
protected Mediator mediator;
public Input2InputTransformer() {
super();
}
@Override
public String getSourceDataBinding() {
return DataBinding.IDL_INPUT;
}
@Override
public String getTargetDataBinding() {
return DataBinding.IDL_INPUT;
}
/**
* @param mediator the mediator to set
*/
@Reference
public void setMediator(Mediator mediator) {
this.mediator = mediator;
}
/**
* @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 10000;
}
/**
* 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.getInputWrapperElement().equals(w2.getInputWrapperElement())) {
return false;
}
// Compare the child elements
List<ElementInfo> list1 = w1.getInputChildElements();
List<ElementInfo> list2 = w2.getInputChildElements();
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[] source, TransformationContext context) {
// Check if the source operation is wrapped
DataType<List<DataType>> sourceType = context.getSourceDataType();
Operation sourceOp = context.getSourceOperation();
boolean sourceWrapped = sourceOp != null && sourceOp.isWrapperStyle();
// Find the wrapper handler for source data
WrapperHandler sourceWrapperHandler = null;
String sourceDataBinding = getDataBinding(sourceOp);
sourceWrapperHandler = getWrapperHandler(sourceDataBinding, sourceWrapped);
// Check if the target operation is wrapped
DataType<List<DataType>> targetType = context.getTargetDataType();
Operation targetOp = (Operation)context.getTargetOperation();
boolean targetWrapped = targetOp != null && targetOp.isWrapperStyle();
// Find the wrapper handler for target data
WrapperHandler targetWrapperHandler = null;
String targetDataBinding = getDataBinding(targetOp);
targetWrapperHandler = getWrapperHandler(targetDataBinding, targetWrapped);
if ((!sourceWrapped) && targetWrapped) {
// Unwrapped --> Wrapped
WrapperInfo wrapper = targetOp.getWrapper();
ElementInfo wrapperElement = wrapper.getInputWrapperElement();
Class<?> targetWrapperClass = wrapper != null ? wrapper.getInputWrapperClass() : null;
if (source == null) {
// Empty child elements
Object targetWrapper = targetWrapperHandler.create(targetOp, true);
return new Object[] {targetWrapper};
}
// If the source can be wrapped, wrapped it first
if (sourceWrapperHandler != null) {
WrapperInfo sourceWrapperInfo = sourceOp.getWrapper();
DataType sourceWrapperType = sourceWrapperInfo != null ? sourceWrapperInfo.getInputWrapperType() : null;
// We only do wrapper to wrapper transformation if the source has a wrapper and both sides
// match by XML structure
if (sourceWrapperType != null && matches(sourceOp.getWrapper(), targetOp.getWrapper())) {
Class<?> sourceWrapperClass = sourceWrapperType.getPhysical();
// Create the source wrapper
Object sourceWrapper = sourceWrapperHandler.create(sourceOp, true);
// Populate the source wrapper
if (sourceWrapper != null) {
sourceWrapperHandler.setChildren(sourceWrapper,
source,
sourceOp,
true);
// Transform the data from source wrapper to target wrapper
Object targetWrapper =
mediator.mediate(sourceWrapper, sourceWrapperType, targetType.getLogical().get(0), context
.getMetadata());
return new Object[] {targetWrapper};
}
}
}
// Fall back to child by child transformation
Object targetWrapper = targetWrapperHandler.create(targetOp, true);
List<DataType> argTypes = wrapper.getUnwrappedInputType().getLogical();
Object[] targetChildren = new Object[source.length];
for (int i = 0; i < source.length; i++) {
// ElementInfo argElement = wrapper.getInputChildElements().get(i);
DataType<XMLType> argType = argTypes.get(i);
targetChildren[i] =
mediator.mediate(source[i], sourceType.getLogical().get(i), argType, context.getMetadata());
}
targetWrapperHandler.setChildren(targetWrapper,
targetChildren,
targetOp,
true);
return new Object[] {targetWrapper};
} else if (sourceWrapped && (!targetWrapped)) {
// Wrapped to Unwrapped
Object sourceWrapper = source[0];
Object[] target = null;
List<ElementInfo> childElements = sourceOp.getWrapper().getInputChildElements();
if (targetWrapperHandler != null) {
ElementInfo wrapperElement = sourceOp.getWrapper().getInputWrapperElement();
// 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, true)) {
WrapperInfo targetWrapperInfo = targetOp.getWrapper();
DataType targetWrapperType =
targetWrapperInfo != null ? targetWrapperInfo.getInputWrapperType() : null;
if (targetWrapperType != null && matches(sourceOp.getWrapper(), targetOp.getWrapper())) {
Object targetWrapper =
mediator.mediate(sourceWrapper, sourceType.getLogical().get(0), targetWrapperType, context
.getMetadata());
target = targetWrapperHandler.getChildren(targetWrapper, targetOp, true).toArray();
return target;
}
}
}
Object[] sourceChildren = sourceWrapperHandler.getChildren(sourceWrapper, sourceOp, true).toArray();
target = new Object[sourceChildren.length];
for (int i = 0; i < sourceChildren.length; i++) {
DataType<XMLType> childType = sourceOp.getWrapper().getUnwrappedInputType().getLogical().get(i);
target[i] =
mediator.mediate(sourceChildren[i], childType, targetType.getLogical().get(i), context
.getMetadata());
}
return target;
} else {
// Assuming wrapper to wrapper conversion can be handled here as well
Object[] newArgs = new Object[source.length];
for (int i = 0; i < source.length; i++) {
Object child =
mediator.mediate(source[i], sourceType.getLogical().get(i), targetType.getLogical().get(i), context
.getMetadata());
newArgs[i] = child;
}
return newArgs;
}
}
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;
}
private String getDataBinding(Operation operation) {
WrapperInfo wrapper = operation.getWrapper();
if (wrapper != null) {
return wrapper.getDataBinding();
} else {
return null;
}
}
}