001/**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.camel.processor.interceptor;
018
019import org.apache.camel.AsyncCallback;
020import org.apache.camel.CamelException;
021import org.apache.camel.Exchange;
022import org.apache.camel.Message;
023import org.apache.camel.Processor;
024import org.apache.camel.processor.DelegateAsyncProcessor;
025
026public class HandleFaultInterceptor extends DelegateAsyncProcessor {
027
028    public HandleFaultInterceptor() {
029    }
030
031    public HandleFaultInterceptor(Processor processor) {
032        super(processor);
033    }
034
035    @Override
036    public String toString() {
037        return "HandleFaultInterceptor[" + processor + "]";
038    }
039
040    @Override
041    public boolean process(final Exchange exchange, final AsyncCallback callback) {
042        return processor.process(exchange, new AsyncCallback() {
043            public void done(boolean doneSync) {
044                try {
045                    // handle fault after we are done
046                    handleFault(exchange);
047                } finally {
048                    // and let the original callback know we are done as well
049                    callback.done(doneSync);
050                }
051            }
052        });
053    }
054
055    /**
056     * Handles the fault message by converting it to an Exception
057     */
058    protected void handleFault(Exchange exchange) {
059        // Take the fault message out before we keep on going
060        Message msg = exchange.hasOut() ? exchange.getOut() : exchange.getIn();
061        if (msg.isFault()) {
062            final Object faultBody = msg.getBody();
063            if (faultBody != null && exchange.getException() == null) {
064                // remove fault as we are converting it to an exception
065                if (exchange.hasOut()) {
066                    exchange.setOut(null);
067                } else {
068                    exchange.setIn(null);
069                }
070                if (faultBody instanceof Throwable) {
071                    exchange.setException((Throwable) faultBody);
072                } else {
073                    // wrap it in an exception
074                    String data = exchange.getContext().getTypeConverter().convertTo(String.class, exchange, faultBody);
075                    exchange.setException(new CamelException(data));
076                }
077            }
078        }
079    }
080
081}