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.reifier;
018
019import java.util.ArrayList;
020import java.util.List;
021
022import org.apache.camel.CamelContext;
023import org.apache.camel.Predicate;
024import org.apache.camel.Processor;
025import org.apache.camel.model.CatchDefinition;
026import org.apache.camel.model.ProcessorDefinition;
027import org.apache.camel.model.TryDefinition;
028import org.apache.camel.processor.CatchProcessor;
029import org.apache.camel.spi.RouteContext;
030
031public class CatchReifier extends ProcessorReifier<CatchDefinition> {
032
033    public CatchReifier(ProcessorDefinition<?> definition) {
034        super(CatchDefinition.class.cast(definition));
035    }
036
037    @Override
038    public CatchProcessor createProcessor(RouteContext routeContext) throws Exception {
039        // create and load exceptions if not done
040        if (definition.getExceptionClasses() == null) {
041            definition.setExceptionClasses(createExceptionClasses(routeContext.getCamelContext()));
042        }
043
044        // must have at least one exception
045        if (definition.getExceptionClasses().isEmpty()) {
046            throw new IllegalArgumentException("At least one Exception must be configured to catch");
047        }
048
049        // parent must be a try
050        if (!(definition.getParent() instanceof TryDefinition)) {
051            throw new IllegalArgumentException("This doCatch should have a doTry as its parent on " + definition);
052        }
053
054        // do catch does not mandate a child processor
055        Processor childProcessor = this.createChildProcessor(routeContext, false);
056
057        Predicate when = null;
058        if (definition.getOnWhen() != null) {
059            when = definition.getOnWhen().getExpression().createPredicate(routeContext);
060        }
061
062        return new CatchProcessor(definition.getExceptionClasses(), childProcessor, when, null);
063    }
064
065    protected List<Class<? extends Throwable>> createExceptionClasses(CamelContext context) throws ClassNotFoundException {
066        // must use the class resolver from CamelContext to load classes to
067        // ensure it can
068        // be loaded in all kind of environments such as JEE servers and OSGi
069        // etc.
070        List<String> list = definition.getExceptions();
071        List<Class<? extends Throwable>> answer = new ArrayList<>(list.size());
072        for (String name : list) {
073            Class<Throwable> type = context.getClassResolver().resolveMandatoryClass(name, Throwable.class);
074            answer.add(type);
075        }
076        return answer;
077    }
078}