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     */
017    package org.apache.camel.processor.interceptor;
018    
019    import org.apache.camel.AsyncCallback;
020    import org.apache.camel.CamelException;
021    import org.apache.camel.Exchange;
022    import org.apache.camel.Processor;
023    import org.apache.camel.processor.DelegateAsyncProcessor;
024    
025    public 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 getProcessor().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                        exchange.setException(new CamelException(faultBody.toString()));
069                    }
070                }
071            }
072        }
073    
074    }