| /** |
| * 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.camel.processor; |
| |
| import java.util.Iterator; |
| import java.util.List; |
| |
| import org.apache.camel.Exchange; |
| import org.apache.camel.Predicate; |
| import org.apache.camel.Processor; |
| import org.apache.camel.util.ObjectHelper; |
| |
| /** |
| * A processor which catches exceptions. |
| * |
| * @version $Revision$ |
| */ |
| public class CatchProcessor extends DelegateProcessor { |
| private final List<Class> exceptions; |
| private final Predicate onWhen; |
| private final Predicate handled; |
| |
| public CatchProcessor(List<Class> exceptions, Processor processor, Predicate onWhen, Predicate handled) { |
| super(processor); |
| this.exceptions = exceptions; |
| this.onWhen = onWhen; |
| this.handled = handled; |
| } |
| |
| @Override |
| public String toString() { |
| return "Catch[" + exceptions + " -> " + getProcessor() + "]"; |
| } |
| |
| /** |
| * Whether this catch processor catch the given thrown exception |
| * |
| * @param exchange the current exchange |
| * @param exception the thrown exception |
| * @return <tt>true</tt> if this processor catches it, <tt>false</tt> otherwise. |
| */ |
| public boolean catches(Exchange exchange, Throwable exception) { |
| // use the exception iterator to walk the caused by hierachy |
| Iterator<Throwable> it = ObjectHelper.createExceptionIterator(exception); |
| while (it.hasNext()) { |
| Throwable e = it.next(); |
| // see if we catch this type |
| for (Class type : exceptions) { |
| if (type.isInstance(e) && matchesWhen(exchange)) { |
| return true; |
| } |
| } |
| } |
| |
| // not found |
| return false; |
| } |
| |
| |
| /** |
| * Whether this catch processor handles the exception it have caught |
| * |
| * @param exchange the current exchange |
| * @return <tt>true</tt> if this processor handles it, <tt>false</tt> otherwise. |
| */ |
| public boolean handles(Exchange exchange) { |
| if (handled == null) { |
| // handle by default |
| return true; |
| } |
| |
| return handled.matches(exchange); |
| } |
| |
| public List<Class> getExceptions() { |
| return exceptions; |
| } |
| |
| /** |
| * Strategy method for matching the exception type with the current exchange. |
| * <p/> |
| * This default implementation will match as: |
| * <ul> |
| * <li>Always true if no when predicate on the exception type |
| * <li>Otherwise the when predicate is matches against the current exchange |
| * </ul> |
| * |
| * @param exchange the current {@link org.apache.camel.Exchange} |
| * @return <tt>true</tt> if matched, <tt>false</tt> otherwise. |
| */ |
| protected boolean matchesWhen(Exchange exchange) { |
| if (onWhen == null) { |
| // if no predicate then it's always a match |
| return true; |
| } |
| return onWhen.matches(exchange); |
| } |
| |
| } |