001    /**
002     *
003     * Licensed to the Apache Software Foundation (ASF) under one or more
004     * contributor license agreements.  See the NOTICE file distributed with
005     * this work for additional information regarding copyright ownership.
006     * The ASF licenses this file to You under the Apache License, Version 2.0
007     * (the "License"); you may not use this file except in compliance with
008     * the License.  You may obtain a copy of the License at
009     *
010     * http://www.apache.org/licenses/LICENSE-2.0
011     *
012     * Unless required by applicable law or agreed to in writing, software
013     * distributed under the License is distributed on an "AS IS" BASIS,
014     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015     * See the License for the specific language governing permissions and
016     * limitations under the License.
017     */
018    package org.apache.camel.builder;
019    
020    import java.util.ArrayList;
021    import java.util.Collections;
022    
023    import org.apache.camel.Exchange;
024    import org.apache.camel.Processor;
025    import org.apache.camel.RuntimeCamelException;
026    import org.apache.camel.spi.Policy;
027    
028    /**
029     * @version $Revision: 519943 $
030     */
031    public class PolicyBuilder implements ProcessorFactory {
032        private final ArrayList<Policy> policies = new ArrayList<Policy>();
033            private final FromBuilder parent;
034            private FromBuilder target;
035    
036            public PolicyBuilder(FromBuilder parent) {
037            this.parent = parent;
038            }
039            
040            @Fluent("policy")
041            public PolicyBuilder add(@FluentArg("ref") Policy interceptor) {
042                    policies.add(interceptor);
043                    return this;
044            }
045            
046            @Fluent(callOnElementEnd=true)
047        public FromBuilder target() {
048            this.target = new FromBuilder(parent);
049            return target;
050        }
051    
052        public Processor createProcessor() throws Exception {
053            
054            // The target is required.
055            if( target == null ) 
056                    throw new RuntimeCamelException("target not provided.");
057            
058            Processor last = target.createProcessor();
059            Collections.reverse(policies);
060            for (Policy p : policies) {
061                last = p.wrap(last);
062            }
063            
064            return last;
065        }
066    }