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.Processor;
023import org.apache.camel.processor.DelegateAsyncProcessor;
024
025public class HandleFaultInterceptor extends DelegateAsyncProcessor {
026
027    public HandleFaultInterceptor() {
028    }
029
030    public HandleFaultInterceptor(Processor processor) {
031        super(processor);
032    }
033
034    @Override
035    public String toString() {
036        return "HandleFaultInterceptor[" + processor + "]";
037    }
038
039    @Override
040    public boolean process(final Exchange exchange, final AsyncCallback callback) {
041        return processor.process(exchange, new AsyncCallback() {
042            public void done(boolean doneSync) {
043                try {
044                    // handle fault after we are done
045                    handleFault(exchange);
046                } finally {
047                    // and let the original callback know we are done as well
048                    callback.done(doneSync);
049                }
050            }
051        });
052    }
053
054    /**
055     * Handles the fault message by converting it to an Exception
056     */
057    protected void handleFault(Exchange exchange) {
058        // Take the fault message out before we keep on going
059        if (exchange.hasOut() && exchange.getOut().isFault()) {
060            final Object faultBody = exchange.getOut().getBody();
061            if (faultBody != null && exchange.getException() == null) {
062                // remove fault as we are converting it to an exception
063                exchange.setOut(null);
064                if (faultBody instanceof Throwable) {
065                    exchange.setException((Throwable) faultBody);
066                } else {
067                    // wrap it in an exception
068                    String data = exchange.getContext().getTypeConverter().convertTo(String.class, exchange, faultBody);
069                    exchange.setException(new CamelException(data));
070                }
071            }
072        }
073    }
074
075}