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.commons.collections.functors; 018 019 import java.io.Serializable; 020 021 import org.apache.commons.collections.Predicate; 022 023 /** 024 * Predicate implementation that returns true if both the predicates return true. 025 * 026 * @since Commons Collections 3.0 027 * @version $Revision: 646777 $ $Date: 2008-04-10 13:33:15 +0100 (Thu, 10 Apr 2008) $ 028 * 029 * @author Stephen Colebourne 030 */ 031 public final class AndPredicate implements Predicate, PredicateDecorator, Serializable { 032 033 /** Serial version UID */ 034 private static final long serialVersionUID = 4189014213763186912L; 035 036 /** The array of predicates to call */ 037 private final Predicate iPredicate1; 038 /** The array of predicates to call */ 039 private final Predicate iPredicate2; 040 041 /** 042 * Factory to create the predicate. 043 * 044 * @param predicate1 the first predicate to check, not null 045 * @param predicate2 the second predicate to check, not null 046 * @return the <code>and</code> predicate 047 * @throws IllegalArgumentException if either predicate is null 048 */ 049 public static Predicate getInstance(Predicate predicate1, Predicate predicate2) { 050 if (predicate1 == null || predicate2 == null) { 051 throw new IllegalArgumentException("Predicate must not be null"); 052 } 053 return new AndPredicate(predicate1, predicate2); 054 } 055 056 /** 057 * Constructor that performs no validation. 058 * Use <code>getInstance</code> if you want that. 059 * 060 * @param predicate1 the first predicate to check, not null 061 * @param predicate2 the second predicate to check, not null 062 */ 063 public AndPredicate(Predicate predicate1, Predicate predicate2) { 064 super(); 065 iPredicate1 = predicate1; 066 iPredicate2 = predicate2; 067 } 068 069 /** 070 * Evaluates the predicate returning true if both predicates return true. 071 * 072 * @param object the input object 073 * @return true if both decorated predicates return true 074 */ 075 public boolean evaluate(Object object) { 076 return (iPredicate1.evaluate(object) && iPredicate2.evaluate(object)); 077 } 078 079 /** 080 * Gets the two predicates being decorated as an array. 081 * 082 * @return the predicates 083 * @since Commons Collections 3.1 084 */ 085 public Predicate[] getPredicates() { 086 return new Predicate[] {iPredicate1, iPredicate2}; 087 } 088 089 }