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.model;
018
019 import java.util.ArrayList;
020 import java.util.List;
021 import javax.xml.bind.annotation.XmlAccessType;
022 import javax.xml.bind.annotation.XmlAccessorType;
023 import javax.xml.bind.annotation.XmlRootElement;
024 import javax.xml.bind.annotation.XmlTransient;
025
026 import org.apache.camel.Predicate;
027 import org.apache.camel.Processor;
028 import org.apache.camel.processor.Pipeline;
029 import org.apache.camel.spi.InterceptStrategy;
030 import org.apache.camel.spi.RouteContext;
031
032 /**
033 * Represents an XML <intercept/> element
034 *
035 * @version $Revision: 771227 $
036 */
037 @XmlRootElement(name = "intercept")
038 @XmlAccessorType(XmlAccessType.FIELD)
039 public class InterceptDefinition extends OutputDefinition<ProcessorDefinition> {
040
041 // TODO: support stop later (its a bit hard as it needs to break entire processing of route)
042
043 @XmlTransient
044 protected Processor output;
045
046 public InterceptDefinition() {
047 }
048
049 @Override
050 public String toString() {
051 return "Intercept[" + getOutputs() + "]";
052 }
053
054 @Override
055 public String getShortName() {
056 return "intercept";
057 }
058
059 @Override
060 public String getLabel() {
061 return "intercept";
062 }
063
064 @Override
065 public Processor createProcessor(final RouteContext routeContext) throws Exception {
066 // create the output processor
067 output = createOutputsProcessor(routeContext);
068
069 // add the output as a intercept strategy to the route context so its invoked on each processing step
070 routeContext.getInterceptStrategies().add(new InterceptStrategy() {
071 public Processor wrapProcessorInInterceptors(ProcessorDefinition processorDefinition, Processor target, Processor nextTarget) throws Exception {
072 if (nextTarget != null) {
073 // wrap in a pipeline so we continue routing to the next
074 List<Processor> list = new ArrayList<Processor>(2);
075 list.add(output);
076 list.add(nextTarget);
077 return new Pipeline(list);
078 } else {
079 return output;
080 }
081 }
082
083 @Override
084 public String toString() {
085 return "intercept[" + output + "]";
086 }
087 });
088
089 // remove me from the route so I am not invoked in a regular route path
090 routeContext.getRoute().getOutputs().remove(this);
091 // and return no processor to invoke next from me
092 return null;
093 }
094
095 /**
096 * Applies this interceptor only if the given predicate is true
097 *
098 * @param predicate the predicate
099 * @return the builder
100 */
101 public ChoiceDefinition when(Predicate predicate) {
102 return choice().when(predicate);
103 }
104
105 /**
106 * This method is <b>only</b> for handling some post configuration
107 * that is needed from the Spring DSL side as JAXB does not invoke the fluent
108 * builders, so we need to manually handle this afterwards, and since this is
109 * an interceptor it has to do a bit of magic logic to fixup to handle predicates
110 * with or without proceed/stop set as well.
111 */
112 public void afterPropertiesSet() {
113 if (getOutputs().size() == 0) {
114 // no outputs
115 return;
116 }
117
118 ProcessorDefinition first = getOutputs().get(0);
119 if (first instanceof WhenDefinition) {
120 WhenDefinition when = (WhenDefinition) first;
121 // move this outputs to the when, expect the first one
122 // as the first one is the interceptor itself
123 for (int i = 1; i < outputs.size(); i++) {
124 ProcessorDefinition out = outputs.get(i);
125 when.addOutput(out);
126 }
127 // remove the moved from the original output, by just keeping the first one
128 ProcessorDefinition keep = outputs.get(0);
129 clearOutput();
130 outputs.add(keep);
131 }
132 }
133
134 }