1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 package org.apache.commons.functor.core.composite; 18 19 import org.apache.commons.functor.BinaryPredicate; 20 21 /** 22 * {@link #test Tests} <code>true</code> iff 23 * none of its children test <code>false</code>. 24 * Note that by this definition, the "and" of 25 * an empty collection of predicates tests <code>true</code>. 26 * <p> 27 * Note that although this class implements 28 * {@link java.io.Serializable Serializable}, a given instance will 29 * only be truly <code>Serializable</code> if all the 30 * underlying functors are. Attempts to serialize 31 * an instance whose delegates are not all 32 * <code>Serializable</code> will result in an exception. 33 * </p> 34 * @version $Revision: 1156320 $ $Date: 2011-08-10 21:14:50 +0200 (Wed, 10 Aug 2011) $ 35 * @author Rodney Waldhoff 36 */ 37 public final class BinaryAnd<L, R> extends BaseBinaryPredicateList<L, R> { 38 39 /** 40 * serialVersionUID declaration. 41 */ 42 private static final long serialVersionUID = -6741089498337923680L; 43 44 // constructor 45 // ------------------------------------------------------------------------ 46 /** 47 * Create a new BinaryAnd. 48 */ 49 public BinaryAnd() { 50 super(); 51 } 52 53 /** 54 * Create a new BinaryAnd instance. 55 * 56 * @param predicates 57 */ 58 public BinaryAnd(BinaryPredicate<? super L, ? super R>... predicates) { 59 super(predicates); 60 } 61 62 /** 63 * Create a new BinaryAnd instance. 64 * 65 * @param predicates 66 */ 67 public BinaryAnd(Iterable<BinaryPredicate<? super L, ? super R>> predicates) { 68 super(predicates); 69 } 70 71 // modifiers 72 // ------------------------------------------------------------------------ 73 /** 74 * And in a BinaryPredicate. 75 * @param p BinaryPredicate to add 76 * @return this 77 */ 78 public BinaryAnd<L, R> and(BinaryPredicate<? super L, ? super R> p) { 79 super.addBinaryPredicate(p); 80 return this; 81 } 82 83 // predicate interface 84 // ------------------------------------------------------------------------ 85 /** 86 * {@inheritDoc} 87 */ 88 public boolean test(L a, R b) { 89 for (BinaryPredicate<? super L, ? super R> p : getBinaryPredicateList()) { 90 if (!p.test(a, b)) { 91 return false; 92 } 93 } 94 return true; 95 } 96 97 /** 98 * {@inheritDoc} 99 */ 100 public boolean equals(Object that) { 101 return that == this || (that instanceof BinaryAnd<?, ?> && equals((BinaryAnd<?, ?>) that)); 102 } 103 104 /** 105 * Learn whether another BinaryAnd is equal to this. 106 * @param that the BinaryAnd to test 107 * @return boolean 108 */ 109 public boolean equals(BinaryAnd<?, ?> that) { 110 return getBinaryPredicateListEquals(that); 111 } 112 113 /** 114 * {@inheritDoc} 115 */ 116 public int hashCode() { 117 return "BinaryAnd".hashCode() ^ getBinaryPredicateListHashCode(); 118 } 119 120 /** 121 * {@inheritDoc} 122 */ 123 public String toString() { 124 return "BinaryAnd<" + getBinaryPredicateListToString() + ">"; 125 } 126 127 }