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.builder; 018 019 import org.apache.camel.Exchange; 020 import org.apache.camel.Expression; 021 022 /** 023 * A helper class for including portions of the <a 024 * href="http://activemq.apache.org/camel/expression.html">expression</a> and 025 * <a href="http://activemq.apache.org/camel/predicate.html">predicate</a> <a 026 * href="http://activemq.apache.org/camel/dsl.html">Java DSL</a> 027 * 028 * @version $Revision: 52382 $ 029 */ 030 public final class Builder { 031 032 /** 033 * Utility classes should not have a public constructor. 034 */ 035 private Builder() { 036 } 037 038 /** 039 * Returns a constant expression 040 */ 041 public static <E extends Exchange> ValueBuilder<E> constant(Object value) { 042 Expression<E> expression = ExpressionBuilder.constantExpression(value); 043 return new ValueBuilder<E>(expression); 044 } 045 046 /** 047 * Returns a predicate and value builder for headers on an exchange 048 */ 049 public static <E extends Exchange> ValueBuilder<E> header(String name) { 050 Expression<E> expression = ExpressionBuilder.headerExpression(name); 051 return new ValueBuilder<E>(expression); 052 } 053 054 /** 055 * Returns a predicate and value builder for the inbound body on an exchange 056 */ 057 public static <E extends Exchange> ValueBuilder<E> body() { 058 Expression<E> expression = ExpressionBuilder.bodyExpression(); 059 return new ValueBuilder<E>(expression); 060 } 061 062 /** 063 * Returns a predicate and value builder for the inbound message body as a 064 * specific type 065 */ 066 public static <E extends Exchange, T> ValueBuilder<E> bodyAs(Class<T> type) { 067 Expression<E> expression = ExpressionBuilder.bodyExpression(type); 068 return new ValueBuilder<E>(expression); 069 } 070 071 /** 072 * Returns a predicate and value builder for the outbound body on an 073 * exchange 074 */ 075 public static <E extends Exchange> ValueBuilder<E> outBody() { 076 Expression<E> expression = ExpressionBuilder.outBodyExpression(); 077 return new ValueBuilder<E>(expression); 078 } 079 080 /** 081 * Returns a predicate and value builder for the outbound message body as a 082 * specific type 083 */ 084 public static <E extends Exchange, T> ValueBuilder<E> outBodyAs(Class<T> type) { 085 Expression<E> expression = ExpressionBuilder.outBodyExpression(type); 086 return new ValueBuilder<E>(expression); 087 } 088 089 /** 090 * Returns a predicate and value builder for the fault body on an 091 * exchange 092 */ 093 public static <E extends Exchange> ValueBuilder<E> faultBody() { 094 Expression<E> expression = ExpressionBuilder.faultBodyExpression(); 095 return new ValueBuilder<E>(expression); 096 } 097 098 /** 099 * Returns a predicate and value builder for the fault message body as a 100 * specific type 101 */ 102 public static <E extends Exchange, T> ValueBuilder<E> faultBodyAs(Class<T> type) { 103 Expression<E> expression = ExpressionBuilder.faultBodyExpression(type); 104 return new ValueBuilder<E>(expression); 105 } 106 107 /** 108 * Returns an expression for the given system property 109 */ 110 public static <E extends Exchange> ValueBuilder<E> systemProperty(final String name) { 111 return systemProperty(name, null); 112 } 113 114 /** 115 * Returns an expression for the given system property 116 */ 117 public static <E extends Exchange> ValueBuilder<E> systemProperty(final String name, 118 final String defaultValue) { 119 return new ValueBuilder<E>(ExpressionBuilder.<E> systemProperty(name, defaultValue)); 120 } 121 }