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.Collection;
020 import java.util.Collections;
021 import java.util.List;
022
023 import javax.xml.bind.annotation.XmlAccessType;
024 import javax.xml.bind.annotation.XmlAccessorType;
025 import javax.xml.bind.annotation.XmlRootElement;
026 import javax.xml.bind.annotation.XmlTransient;
027
028 import org.apache.camel.Intercept;
029 import org.apache.camel.Predicate;
030 import org.apache.camel.Processor;
031 import org.apache.camel.builder.PredicateBuilder;
032 import org.apache.camel.processor.Interceptor;
033 import org.apache.camel.spi.RouteContext;
034
035 /**
036 * Represents an XML <intercept/> element
037 *
038 * @version $Revision: 674289 $
039 */
040 @XmlRootElement(name = "intercept")
041 @XmlAccessorType(XmlAccessType.FIELD)
042 public class InterceptType extends OutputType<ProcessorType> {
043
044 @XmlTransient
045 private ProceedType proceed = new ProceedType();
046 @XmlTransient
047 private Boolean stop = Boolean.FALSE;
048 @XmlTransient
049 private Boolean usePredicate = Boolean.FALSE;
050
051 @Override
052 public String toString() {
053 return "Intercept[" + getOutputs() + "]";
054 }
055
056 @Override
057 public String getShortName() {
058 return "intercept";
059 }
060
061 @Override
062 public Processor createProcessor(RouteContext routeContext) throws Exception {
063 Interceptor interceptor = new Interceptor();
064 routeContext.intercept(interceptor);
065
066 final Processor interceptRoute = createOutputsProcessor(routeContext);
067 interceptor.setInterceptorLogic(interceptRoute);
068
069 return interceptor;
070 }
071
072 /**
073 * Applies this interceptor only if the given predicate is true
074 */
075 public ChoiceType when(Predicate predicate) {
076 usePredicate = Boolean.TRUE;
077 ChoiceType choice = choice().when(PredicateBuilder.not(predicate));
078 choice.addOutput(proceed);
079 return choice.otherwise();
080 }
081
082 public ProceedType getProceed() {
083 return proceed;
084 }
085
086 public void stopIntercept() {
087 stop = Boolean.TRUE;
088 }
089
090 public InterceptType createProxy() {
091 InterceptType answer = new InterceptType();
092 answer.getOutputs().addAll(this.getOutputs());
093
094 // hack: now we need to replace the proceed of the proxy with its own
095 // a bit ugly, operating based on the assumption that the proceed is
096 // in its outputs (if proceed() was called) and/or in the
097 // outputs of the otherwise or last when clause for the predicated version.
098 if (answer.getOutputs().size() > 0) {
099 // this is for the predicate version or if a choice() is present
100 ChoiceType choice = null;
101 for (ProcessorType processor : answer.getOutputs()) {
102 if (processor instanceof ChoiceType) {
103 // special cases for predicates (choices)
104 choice = (ChoiceType) processor;
105
106 // for the predicated version we add the proceed() to otherwise()
107 // before knowing if stop() will follow, so let's make a small adjustment
108 if (usePredicate.booleanValue() && stop.booleanValue()) {
109 WhenType when = choice.getWhenClauses().get(0);
110 when.getOutputs().remove(this.getProceed());
111 }
112
113 // add proceed to the when clause
114 addProceedProxy(this.getProceed(), answer.getProceed(),
115 choice.getWhenClauses().get(choice.getWhenClauses().size() - 1), usePredicate.booleanValue() && !stop.booleanValue());
116
117 // force adding a proceed at the end (otherwise) if its not a stop type
118 addProceedProxy(this.getProceed(), answer.getProceed(), choice.getOtherwise(), !stop.booleanValue());
119
120 if (stop.booleanValue()) {
121 // must add proceed to when clause if stop is explictiy declared, otherwise when the
122 // predicate test fails then there is no proceed
123 // See example: InterceptorSimpleRouteTest (City Paris is never proceeded)
124 addProceedProxy(this.getProceed(), answer.getProceed(),
125 choice.getWhenClauses().get(choice.getWhenClauses().size() - 1), usePredicate.booleanValue());
126 }
127
128 break;
129 }
130 }
131 if (choice == null) {
132 // force adding a proceed at the end if its not a stop type
133 addProceedProxy(this.getProceed(), answer.getProceed(), answer, !stop.booleanValue());
134 }
135 }
136
137 return answer;
138 }
139
140 private void addProceedProxy(ProceedType orig, ProceedType proxy, ProcessorType<?> processor, boolean force) {
141 int index = processor.getOutputs().indexOf(orig);
142 if (index >= 0) {
143 processor.addOutput(proxy);
144 // replace original proceed with proxy
145 List<ProcessorType<?>> outs = processor.getOutputs();
146 outs.remove(proxy);
147 outs.set(index, proxy);
148 } else if (force) {
149 processor.addOutput(proxy);
150 }
151 }
152
153 }