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 */ 017package org.apache.camel.builder; 018 019import java.util.Map; 020import java.util.function.BiPredicate; 021import java.util.function.Predicate; 022 023import org.apache.camel.Exchange; 024import org.apache.camel.Message; 025 026public class PredicateClause<T> implements org.apache.camel.Predicate { 027 private final T parent; 028 private Predicate<Exchange> predicate; 029 030 public PredicateClause(T parent) { 031 this.parent = parent; 032 this.predicate = null; 033 } 034 035 @Override 036 public boolean matches(Exchange exchange) { 037 return (predicate != null) ? predicate.test(exchange) : false; 038 } 039 040 // ******************************* 041 // Exchange 042 // ******************************* 043 044 /** 045 * Define a {@link org.apache.camel.Predicate} which targets the Exchange. 046 */ 047 public T exchange(final Predicate<Exchange> predicate) { 048 this.predicate = predicate::test; 049 return parent; 050 } 051 052 053 // ******************************* 054 // Message 055 // ******************************* 056 057 /** 058 * Define a {@link org.apache.camel.Predicate} which targets the Exchange In Message. 059 * 060 * <blockquote><pre>{@code 061 * from("direct:aggregate") 062 * .choice() 063 * .when() 064 * .message(m -> m.getBody() != null) 065 * .log("Received ${body}") 066 * .endChoice() 067 * }</pre></blockquote> 068 */ 069 public T message(final Predicate<Message> predicate) { 070 return exchange(e -> predicate.test(e.getIn())); 071 } 072 073 // ******************************* 074 // Body 075 // ******************************* 076 077 078 /** 079 * Define a {@link org.apache.camel.Predicate} which targets the Exchange In Body. 080 * 081 * <blockquote><pre>{@code 082 * from("direct:aggregate") 083 * .choice() 084 * .when() 085 * .body(b -> b != null) 086 * .log("Received ${body}") 087 * .endChoice() 088 * }</pre></blockquote> 089 */ 090 public T body(final Predicate<Object> predicate) { 091 return exchange(e -> predicate.test(e.getIn().getBody())); 092 } 093 094 /** 095 * Define a {@link org.apache.camel.Predicate} which targets the typed Exchange In Body. 096 * 097 * <blockquote><pre>{@code 098 * from("direct:aggregate") 099 * .choice() 100 * .when() 101 * .body(Long.class, b -> (b & 1) == 0) 102 * .log("Received even number ${body}") 103 * .endChoice() 104 * }</pre></blockquote> 105 */ 106 public <B> T body(final Class<B> type, final Predicate<B> predicate) { 107 return exchange(e -> predicate.test(e.getIn().getBody(type))); 108 } 109 110 /** 111 * Define a {@link org.apache.camel.Predicate} which targets the Exchange In Body and its Headers. 112 * 113 * <blockquote><pre>{@code 114 * from("direct:aggregate") 115 * .choice() 116 * .when() 117 * .body((b, h) -> b != null || h.containsKy("ToProcess")) 118 * .log("Received ${body}") 119 * .endChoice() 120 * }</pre></blockquote> 121 */ 122 public T body(final BiPredicate<Object, Map<String, Object>> predicate) { 123 return exchange(e -> predicate.test( 124 e.getIn().getBody(), 125 e.getIn().getHeaders()) 126 ); 127 } 128 129 /** 130 * Define a {@link org.apache.camel.Predicate} which targets the typed Exchange In Body and its Headers. 131 * 132 * <blockquote><pre>{@code 133 * from("direct:aggregate") 134 * .choice() 135 * .when() 136 * .body(String.class, (b, h) -> b != null && !b.isEmpty() || h.containsKy("ToProcess")) 137 * .log("Received ${body}") 138 * .endChoice() 139 * }</pre></blockquote> 140 */ 141 public <B> T body(final Class<B> type, final BiPredicate<B, Map<String, Object>> predicate) { 142 return exchange(e -> predicate.test( 143 e.getIn().getBody(type), 144 e.getIn().getHeaders()) 145 ); 146 } 147}