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Diffstat (limited to 'sca-java-2.x/tags/2.0.1-RC1/modules/core-databinding/src/main/java/org/apache/tuscany/sca/core/databinding/transformers/Input2InputTransformer.java')
| -rw-r--r-- | sca-java-2.x/tags/2.0.1-RC1/modules/core-databinding/src/main/java/org/apache/tuscany/sca/core/databinding/transformers/Input2InputTransformer.java | 286 |
1 files changed, 286 insertions, 0 deletions
diff --git a/sca-java-2.x/tags/2.0.1-RC1/modules/core-databinding/src/main/java/org/apache/tuscany/sca/core/databinding/transformers/Input2InputTransformer.java b/sca-java-2.x/tags/2.0.1-RC1/modules/core-databinding/src/main/java/org/apache/tuscany/sca/core/databinding/transformers/Input2InputTransformer.java new file mode 100644 index 0000000000..dfb6827762 --- /dev/null +++ b/sca-java-2.x/tags/2.0.1-RC1/modules/core-databinding/src/main/java/org/apache/tuscany/sca/core/databinding/transformers/Input2InputTransformer.java @@ -0,0 +1,286 @@ +/* + * 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.core.ExtensionPointRegistry; +import org.apache.tuscany.sca.core.UtilityExtensionPoint; +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.BaseTransformer; +import org.apache.tuscany.sca.interfacedef.DataType; +import org.apache.tuscany.sca.interfacedef.Operation; +import static org.apache.tuscany.sca.interfacedef.Operation.IDL_INPUT; +import org.apache.tuscany.sca.interfacedef.util.ElementInfo; +import org.apache.tuscany.sca.interfacedef.util.WrapperInfo; +import org.apache.tuscany.sca.interfacedef.util.XMLType; + +/** + * This is a special transformer to transform the input from one IDL to the + * other one + * + * @version $Rev$ $Date$ + */ +public class Input2InputTransformer extends BaseTransformer<Object[], Object[]> implements + PullTransformer<Object[], Object[]> { + protected Mediator mediator; + + public Input2InputTransformer(ExtensionPointRegistry registry) { + super(); + this.mediator = registry.getExtensionPoint(UtilityExtensionPoint.class).getUtility(Mediator.class); + } + + @Override + public String getSourceDataBinding() { + return IDL_INPUT; + } + + @Override + public String getTargetDataBinding() { + return IDL_INPUT; + } + + /** + * @see org.apache.tuscany.sca.databinding.BaseTransformer#getSourceType() + */ + @Override + protected Class<Object[]> getSourceType() { + return Object[].class; + } + + /** + * @see org.apache.tuscany.sca.databinding.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.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(); + // TUSCANY-3298: In the following situation: + // 1. The child is a java.util.Map type + // 2. The child's name is a Java keyword (e.g., return) + // 3. Tuscany is using a generated JAXB wrapper class for WSDL generation + // the Java to WSDL generation process results in the WSDL element name + // having a leading underscore added to the actual element name. This is + // because of a known JAXB issue that prevents the @XmlElement annotation + // being used on a java.util.Map type property field in the wrapper bean + // (see https://jaxb.dev.java.net/issues/show_bug.cgi?id=268). + // To prevent the compatibility match from failing in this situation, + // we strip any leading underscore before doing the comparison. + if (!stripLeadingUnderscore(n1).equals(stripLeadingUnderscore(n2))) { + return false; + } + } + return true; + } + + private static String stripLeadingUnderscore(String name) { + return name.startsWith("_") ? name.substring(1) : name; + } + + @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.isInputWrapperStyle() && sourceOp.getInputWrapper() != null; + boolean sourceNotSubjectToWrapping = sourceOp != null && sourceOp.isNotSubjectToWrapping(); + + // 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.isInputWrapperStyle() && targetOp.getInputWrapper() != null; + boolean targetNotSubjectToWrapping = targetOp != null && targetOp.isNotSubjectToWrapping(); + + // Find the wrapper handler for target data + WrapperHandler targetWrapperHandler = null; + String targetDataBinding = getDataBinding(targetOp); + targetWrapperHandler = getWrapperHandler(targetDataBinding, targetWrapped); + + if ((!sourceWrapped && !sourceNotSubjectToWrapping) && targetWrapped) { + // Unwrapped --> Wrapped + WrapperInfo wrapper = targetOp.getInputWrapper(); + // 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.getInputWrapper(); + DataType sourceWrapperType = sourceWrapperInfo != null ? sourceWrapperInfo.getWrapperType() : 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.getInputWrapper(), targetOp.getInputWrapper())) { + 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.getUnwrappedType().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 && !targetNotSubjectToWrapping)) { + // 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.getInputWrapper(); + DataType targetWrapperType = + targetWrapperInfo != null ? targetWrapperInfo.getWrapperType() : null; + if (targetWrapperType != null && matches(sourceOp.getInputWrapper(), targetOp.getInputWrapper())) { + 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.getInputWrapper().getUnwrappedType().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.getInputWrapper(); + if (wrapper != null) { + return wrapper.getDataBinding(); + } else { + return null; + } + } + +} |