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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.core.databinding.impl;
-
-import java.lang.reflect.InvocationTargetException;
-import java.util.HashMap;
-import java.util.Map;
-
-import javax.xml.namespace.QName;
-
-import org.apache.tuscany.spi.component.CompositeComponent;
-import org.apache.tuscany.spi.databinding.DataBinding;
-import org.apache.tuscany.spi.databinding.ExceptionHandler;
-import org.apache.tuscany.spi.databinding.Mediator;
-import org.apache.tuscany.spi.databinding.TransformationException;
-import org.apache.tuscany.spi.idl.ServiceFaultException;
-import org.apache.tuscany.spi.model.DataType;
-import org.apache.tuscany.spi.model.Operation;
-import org.apache.tuscany.spi.wire.Interceptor;
-import org.apache.tuscany.spi.wire.Message;
-import org.apache.tuscany.spi.wire.Wire;
-
-/**
- * An interceptor to transform data accross databindings on the wire
- *
- * @version $Rev$ $Date$
- */
-public class DataBindingInteceptor implements Interceptor {
- private Interceptor next;
-
- private CompositeComponent compositeComponent;
-
- private Operation<?> sourceOperation;
-
- private Operation<?> targetOperation;
-
- private Mediator mediator;
-
- public DataBindingInteceptor(Wire sourceWire, Operation<?> sourceOperation, Operation<?> targetOperation) {
- super();
- // this.sourceWire = sourceWire;
- this.sourceOperation = sourceOperation;
- // this.targetWire = targetWire;
- this.targetOperation = targetOperation;
- this.compositeComponent = sourceWire.getContainer().getParent();
- }
-
- /**
- * @see org.apache.tuscany.spi.wire.Interceptor#getNext()
- */
- public Interceptor getNext() {
- return next;
- }
-
- /**
- * @see org.apache.tuscany.spi.wire.Interceptor#invoke(org.apache.tuscany.spi.wire.Message)
- */
- /*
- * (non-Javadoc)
- *
- * @see org.apache.tuscany.spi.wire.Interceptor#invoke(org.apache.tuscany.spi.wire.Message)
- */
- public Message invoke(Message msg) {
- Object input = transform(msg.getBody(), sourceOperation.getInputType(), targetOperation.getInputType());
- msg.setBody(input);
- Message resultMsg = next.invoke(msg);
- Object result = resultMsg.getBody();
- if (sourceOperation.isNonBlocking()) {
- // Not to reset the message body
- return resultMsg;
- }
-
- // FIXME: Should we fix the Operation model so that getOutputType
- // returns DataType<DataType<T>>?
- DataType<DataType> targetType =
- new DataType<DataType>(DataBinding.IDL_OUTPUT, Object.class, targetOperation.getOutputType());
-
- targetType.setOperation(targetOperation.getOutputType().getOperation());
- DataType<DataType> sourceType =
- new DataType<DataType>(DataBinding.IDL_OUTPUT, Object.class, sourceOperation.getOutputType());
- sourceType.setOperation(sourceOperation.getOutputType().getOperation());
-
- if (resultMsg.isFault()) {
-
- // FIXME: We need to figure out what fault type it is and then
- // transform it
- // back the source fault type
- // throw new InvocationRuntimeException((Throwable) result);
-
- if ((result instanceof Exception) && !(result instanceof RuntimeException)) {
- // FIXME: How to match fault data to a fault type for the
- // operation?
-
- // If the result is from an InvocationTargetException look at
- // the actual cause.
- if (result instanceof InvocationTargetException) {
- result = ((InvocationTargetException)result).getCause();
- }
- DataType targetDataType = null;
- for (DataType exType : targetOperation.getFaultTypes()) {
- if (((Class)exType.getPhysical()).isInstance(result)) {
- if (result instanceof ServiceFaultException) {
- if (((ServiceFaultException)result).isMatchingType(exType.getLogical())) {
- targetDataType = exType;
- break;
- }
-
- } else {
- targetDataType = exType;
- break;
- }
- }
- }
-
- if (targetDataType == null) {
- // Not a business exception
- return resultMsg;
- }
-
- DataType targetFaultType = getFaultType(targetDataType);
- if (targetFaultType == null) {
- throw new TransformationException("Target fault type cannot be resolved");
- }
-
- // FIXME: How to match a source fault type to a target fault
- // type?
- DataType sourceDataType = null;
- DataType sourceFaultType = null;
- for (DataType exType : sourceOperation.getFaultTypes()) {
- DataType faultType = getFaultType(exType);
- // Match by the QName (XSD element) of the fault type
- if (faultType != null && targetFaultType.getLogical().equals(faultType.getLogical())) {
- sourceDataType = exType;
- sourceFaultType = faultType;
- break;
- }
- }
-
- if (sourceFaultType == null) {
- throw new TransformationException("No matching source fault type is found");
- }
-
- Object newResult =
- transformException(result, targetDataType, sourceDataType, targetFaultType, sourceFaultType);
- if (newResult != result) {
- resultMsg.setBodyWithFault(newResult);
- }
- }
-
- } else {
- assert !(result instanceof Throwable) : "Expected messages that are not throwable " + result;
-
- Object newResult = transform(result, targetType, sourceType);
- if (newResult != result) {
- resultMsg.setBody(newResult);
- }
- }
-
- return resultMsg;
- }
-
- private Object transform(Object source, DataType sourceType, DataType targetType) {
- if (sourceType == targetType || (sourceType != null && sourceType.equals(targetType))) {
- return source;
- }
- Map<Class<?>, Object> metadata = new HashMap<Class<?>, Object>();
- metadata.put(CompositeComponent.class, compositeComponent);
- return mediator.mediate(source, sourceType, targetType, metadata);
- }
-
- private DataType getFaultType(DataType exceptionType) {
- // FIXME: We cannot assume the exception will have a databinding set
- DataBinding targetDataBinding =
- mediator.getDataBindingRegistry().getDataBinding(exceptionType.getDataBinding());
- if (targetDataBinding == null) {
- return null;
- }
- ExceptionHandler targetHandler = targetDataBinding.getExceptionHandler();
- if (targetHandler == null) {
- return null;
- }
- return targetHandler.getFaultType(exceptionType);
- }
-
- /**
- * @param source The source exception
- * @param sourceExType The data type for the source exception
- * @param targetExType The data type for the target exception
- * @param sourceType The fault type for the source
- * @param targetType The fault type for the target
- * @return
- */
- private Object transformException(Object source,
- DataType sourceExType,
- DataType targetExType,
- DataType sourceType,
- DataType targetType) {
- if (sourceType == targetType || (sourceType != null && sourceType.equals(targetType))) {
- return source;
- }
- Map<Class<?>, Object> metadata = new HashMap<Class<?>, Object>();
- metadata.put(CompositeComponent.class, compositeComponent);
-
- DataType<DataType<?>> eSourceDataType =
- new DataType<DataType<?>>("idl:fault", sourceExType.getPhysical(), sourceType);
- DataType<DataType<?>> eTargetDataType =
- new DataType<DataType<?>>("idl:fault", targetExType.getPhysical(), targetType);
-
- return mediator.mediate(source, eSourceDataType, eTargetDataType, metadata);
- }
-
- /**
- * @see org.apache.tuscany.spi.wire.Interceptor#isOptimizable()
- */
- public boolean isOptimizable() {
- return false;
- }
-
- /**
- * @see org.apache.tuscany.spi.wire.Interceptor#setNext(org.apache.tuscany.spi.wire.Interceptor)
- */
- public void setNext(Interceptor next) {
- this.next = next;
- }
-
- /**
- * @param mediator the mediator to set
- */
- public void setMediator(Mediator mediator) {
- this.mediator = mediator;
- }
-
-}