diff options
Diffstat (limited to 'sca-java-1.x/tags/1.5/modules/core-databinding/src/main/java/org/apache/tuscany/sca/core/databinding/transformers/Output2OutputTransformer.java')
-rw-r--r-- | sca-java-1.x/tags/1.5/modules/core-databinding/src/main/java/org/apache/tuscany/sca/core/databinding/transformers/Output2OutputTransformer.java | 257 |
1 files changed, 257 insertions, 0 deletions
diff --git a/sca-java-1.x/tags/1.5/modules/core-databinding/src/main/java/org/apache/tuscany/sca/core/databinding/transformers/Output2OutputTransformer.java b/sca-java-1.x/tags/1.5/modules/core-databinding/src/main/java/org/apache/tuscany/sca/core/databinding/transformers/Output2OutputTransformer.java new file mode 100644 index 0000000000..348d8345b2 --- /dev/null +++ b/sca-java-1.x/tags/1.5/modules/core-databinding/src/main/java/org/apache/tuscany/sca/core/databinding/transformers/Output2OutputTransformer.java @@ -0,0 +1,257 @@ +/* + * 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); + } + } + +} |