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; 018 019 import java.util.IdentityHashMap; 020 import java.util.List; 021 import java.util.Map; 022 import java.util.Set; 023 024 import org.apache.camel.Exchange; 025 import org.apache.camel.Processor; 026 import org.apache.camel.impl.ServiceSupport; 027 import org.apache.camel.model.ExceptionType; 028 029 /** 030 * @version $Revision: 642753 $ 031 */ 032 public abstract class ErrorHandlerSupport extends ServiceSupport implements ErrorHandler { 033 private Map<Class, ExceptionType> exceptionPolicices = new IdentityHashMap<Class, ExceptionType>(); 034 035 public void addExceptionPolicy(ExceptionType exception) { 036 Processor processor = exception.getErrorHandler(); 037 addChildService(processor); 038 039 List<Class> list = exception.getExceptionClasses(); 040 041 for (Class exceptionType : list) { 042 exceptionPolicices.put(exceptionType, exception); 043 } 044 } 045 046 /** 047 * Attempts to invoke the handler for this particular exception if one is available 048 */ 049 protected boolean customProcessorForException(Exchange exchange, Throwable exception) throws Exception { 050 ExceptionType policy = getExceptionPolicy(exchange, exception); 051 Processor processor = policy.getErrorHandler(); 052 if (processor != null) { 053 processor.process(exchange); 054 return true; 055 } 056 return false; 057 } 058 059 protected ExceptionType getExceptionPolicy(Exchange exchange, Throwable exception) { 060 Set<Map.Entry<Class, ExceptionType>> entries = exceptionPolicices.entrySet(); 061 for (Map.Entry<Class, ExceptionType> entry : entries) { 062 Class type = entry.getKey(); 063 if (type.isInstance(exception)) { 064 return entry.getValue(); 065 } 066 } 067 return null; 068 } 069 }