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Diffstat (limited to '')
-rw-r--r-- | sca-java-2.x/tags/2.0-Beta1-RC2/modules/core-databinding/src/main/java/org/apache/tuscany/sca/core/databinding/wire/DataTransformationInterceptor.java | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/sca-java-2.x/tags/2.0-Beta1-RC2/modules/core-databinding/src/main/java/org/apache/tuscany/sca/core/databinding/wire/DataTransformationInterceptor.java b/sca-java-2.x/tags/2.0-Beta1-RC2/modules/core-databinding/src/main/java/org/apache/tuscany/sca/core/databinding/wire/DataTransformationInterceptor.java new file mode 100644 index 0000000000..7bf9833d04 --- /dev/null +++ b/sca-java-2.x/tags/2.0-Beta1-RC2/modules/core-databinding/src/main/java/org/apache/tuscany/sca/core/databinding/wire/DataTransformationInterceptor.java @@ -0,0 +1,148 @@ +/* + * 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.Method; +import java.lang.reflect.Type; +import java.util.HashMap; +import java.util.List; +import java.util.Map; + +import org.apache.tuscany.sca.databinding.Mediator; +import org.apache.tuscany.sca.interfacedef.DataType; +import org.apache.tuscany.sca.interfacedef.Operation; +import org.apache.tuscany.sca.interfacedef.java.JavaOperation; +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.Invocable; + +/** + * An interceptor to transform data across databindings on the wire + * + * @version $Rev$ $Date$ + */ +public class DataTransformationInterceptor implements Interceptor { + private Invoker next; + + private Operation sourceOperation; + + private Operation targetOperation; + private Invocable invocable; + private Mediator mediator; + + public DataTransformationInterceptor(Invocable invocable, + Operation sourceOperation, + Operation targetOperation, + Mediator mediator) { + super(); + this.sourceOperation = sourceOperation; + this.targetOperation = targetOperation; + if ( sourceOperation instanceof JavaOperation ) { + JavaOperation javaOp = (JavaOperation) sourceOperation; + Method sourceMethod = javaOp.getJavaMethod(); + } + // Holder pattern. In order to perform data mediation on Holder return types, it is + // necessary to set up a data transformation on the Holder<T> class T. on return. + DataType<DataType> returnTargetType = getFirstHolderType( sourceOperation.getInputType() ); + if ( returnTargetType != null ) { + this.sourceOperation.setOutputType(returnTargetType); + } + returnTargetType = getFirstHolderType( targetOperation.getInputType() ); + if ( returnTargetType != null ) { + this.targetOperation.setOutputType(returnTargetType); + } + + this.mediator = mediator; + this.invocable = invocable; + } + + public Invoker getNext() { + return next; + } + + public Message invoke(Message msg) { + Map<String, Object> metadata = new HashMap<String, Object>(); + metadata.put(Invocable.class.getName(), invocable); + Object input = mediator.mediateInput(msg.getBody(), sourceOperation, targetOperation, metadata); + msg.setBody(input); + Message resultMsg = next.invoke(msg); + + if (sourceOperation.isNonBlocking()) { + // Not to reset the message body + return resultMsg; + } + + Object result = resultMsg.getBody(); + + if (resultMsg.isFault()) { + Object transformedFault = null; + if ((result instanceof Exception) && !(result instanceof RuntimeException)) { + transformedFault = mediator.mediateFault(result, sourceOperation, targetOperation, metadata); + if (transformedFault != result) { + resultMsg.setFaultBody(transformedFault); + } + } + // + // Leave it to another layer to actually throw the Exception which constitutes + // the message body. We don't throw it here. + // + } else { + assert !(result instanceof Throwable) : "Expected messages that are not throwable " + result; + Object newResult = mediator.mediateOutput(result, sourceOperation, targetOperation, metadata); + resultMsg.setBody(newResult); + } + + return resultMsg; + } + + public void setNext(Invoker next) { + this.next = next; + } + + /** + * Returns return type for first Holder in input list. + * Returns null if the inputs do not contain a Holder. + */ + protected static DataType<DataType> getFirstHolderType( DataType<List<DataType>> inputTypes ) { + if (inputTypes != null) { + List<DataType> logicalType = inputTypes.getLogical(); + if (logicalType != null) { + for (int i = 0; i < logicalType.size(); i++) { + DataType dataType = logicalType.get(i); + if (isHolder(dataType.getGenericType())) { + // Fix up output from void to returned data type. + // System.out.println("DataTransformationInterceptor.<> source input[" + i + "] is Holder, logicalType=" + dataType); + return dataType; + } + } + } + } + return null; + } + + protected static boolean isHolder( Type type ) { + String typeString = type.toString(); + if ( typeString.startsWith( "javax.xml.ws.Holder" ) ) { + return true; + } + return false; + } +} |