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.List; 022 023 import org.apache.camel.Exchange; 024 import org.apache.camel.processor.DelegateProcessor; 025 import org.apache.camel.Processor; 026 import org.apache.camel.RuntimeCamelException; 027 028 /** 029 * @version $Revision: 519943 $ 030 */ 031 public class InterceptorBuilder implements ProcessorFactory { 032 private final List<DelegateProcessor> intercepts = new ArrayList<DelegateProcessor>(); 033 private final FromBuilder parent; 034 private FromBuilder target; 035 036 public InterceptorBuilder(FromBuilder parent) { 037 this.parent = parent; 038 } 039 040 @Fluent("interceptor") 041 public InterceptorBuilder add(@FluentArg("ref") DelegateProcessor interceptor) { 042 intercepts.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 provided."); 057 058 // Interceptors are optional 059 DelegateProcessor first=null; 060 DelegateProcessor last=null; 061 for (DelegateProcessor p : intercepts) { 062 if( first == null ) { 063 first = p; 064 } 065 if( last != null ) { 066 last.setNext(p); 067 } 068 last = p; 069 } 070 071 Processor p = target.createProcessor(); 072 if( last != null ) { 073 last.setNext(p); 074 } 075 return first == null ? p : first; 076 } 077 }