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; 018 019 import org.apache.camel.util.ObjectHelper; 020 import static org.apache.camel.util.ObjectHelper.notNull; 021 022 /** 023 * A helper class for working with predicates 024 * 025 * @version $Revision: 520261 $ 026 */ 027 public class Predicates { 028 /** 029 * A helper method to combine multiple predicates by a logical AND 030 */ 031 public static <E extends Exchange> Predicate<E> and(final Predicate<E> left, final Predicate<E> right) { 032 notNull(left, "left"); 033 notNull(right, "right"); 034 return new Predicate<E>() { 035 public boolean evaluate(E exchange) { 036 return left.evaluate(exchange) && right.evaluate(exchange); 037 } 038 }; 039 } 040 041 /** 042 * A helper method to combine multiple predicates by a logical OR 043 */ 044 public static <E extends Exchange> Predicate<E> or(final Predicate<E> left, final Predicate<E> right) { 045 notNull(left, "left"); 046 notNull(right, "right"); 047 return new Predicate<E>() { 048 public boolean evaluate(E exchange) { 049 return left.evaluate(exchange) || right.evaluate(exchange); 050 } 051 }; 052 } 053 054 055 public static <E extends Exchange> Predicate<E> isEqualTo(final Expression<E> left, final Expression<E> right) { 056 notNull(left, "left"); 057 notNull(right, "right"); 058 059 return new Predicate<E>() { 060 public boolean evaluate(E exchange) { 061 Object value1 = left.evaluate(exchange); 062 Object value2 = right.evaluate(exchange); 063 return ObjectHelper.equals(value1, value2); 064 } 065 }; 066 } 067 068 public static <E extends Exchange> Predicate<E> isNotEqualTo(final Expression<E> left, final Expression<E> right) { 069 notNull(left, "left"); 070 notNull(right, "right"); 071 072 return new Predicate<E>() { 073 public boolean evaluate(E exchange) { 074 Object value1 = left.evaluate(exchange); 075 Object value2 = right.evaluate(exchange); 076 return !ObjectHelper.equals(value1, value2); 077 } 078 }; 079 } 080 081 public static <E extends Exchange> Predicate<E> isLessThan(final Expression<E> left, final Expression<E> right) { 082 notNull(left, "left"); 083 notNull(right, "right"); 084 085 return new Predicate<E>() { 086 public boolean evaluate(E exchange) { 087 Object value1 = left.evaluate(exchange); 088 Object value2 = right.evaluate(exchange); 089 return ObjectHelper.compare(value1, value2) < 0; 090 } 091 }; 092 } 093 094 public static <E extends Exchange> Predicate<E> isLessThanOrEqualTo(final Expression<E> left, final Expression<E> right) { 095 notNull(left, "left"); 096 notNull(right, "right"); 097 098 return new Predicate<E>() { 099 public boolean evaluate(E exchange) { 100 Object value1 = left.evaluate(exchange); 101 Object value2 = right.evaluate(exchange); 102 return ObjectHelper.compare(value1, value2) <= 0; 103 } 104 }; 105 } 106 107 public static <E extends Exchange> Predicate<E> isGreaterThan(final Expression<E> left, final Expression<E> right) { 108 notNull(left, "left"); 109 notNull(right, "right"); 110 111 return new Predicate<E>() { 112 public boolean evaluate(E exchange) { 113 Object value1 = left.evaluate(exchange); 114 Object value2 = right.evaluate(exchange); 115 return ObjectHelper.compare(value1, value2) > 0; 116 } 117 }; 118 } 119 120 public static <E extends Exchange> Predicate<E> isGreaterThanOrEqualTo(final Expression<E> left, final Expression<E> right) { 121 notNull(left, "left"); 122 notNull(right, "right"); 123 124 return new Predicate<E>() { 125 public boolean evaluate(E exchange) { 126 Object value1 = left.evaluate(exchange); 127 Object value2 = right.evaluate(exchange); 128 return ObjectHelper.compare(value1, value2) >= 0; 129 } 130 }; 131 } 132 }