1 /* 2 * Copyright (c) 2011 jMonkeyEngine 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: 8 * 9 * * Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 12 * * Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * * Neither the name of 'jMonkeyEngine' nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 24 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 26 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 27 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 28 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 29 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 30 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 package com.jme3.network; 34 35 import java.util.Arrays; 36 import java.util.Collection; 37 import java.util.HashSet; 38 39 /** 40 * Static utility methods pertaining to Filter instances. 41 * 42 * @version $Revision: 8843 $ 43 * @author Paul Speed 44 */ 45 public class Filters 46 { 47 /** 48 * Creates a filter that returns true for any value in the specified 49 * list of values and false for all other cases. 50 */ in( T... values )51 public static <T> Filter<T> in( T... values ) 52 { 53 return in( new HashSet<T>(Arrays.asList(values)) ); 54 } 55 56 /** 57 * Creates a filter that returns true for any value in the specified 58 * collection and false for all other cases. 59 */ in( Collection<? extends T> collection )60 public static <T> Filter<T> in( Collection<? extends T> collection ) 61 { 62 return new InFilter<T>(collection); 63 } 64 65 /** 66 * Creates a filter that returns true for any value NOT in the specified 67 * list of values and false for all other cases. This is the equivalent 68 * of calling not(in(values)). 69 */ notIn( T... values )70 public static <T> Filter<T> notIn( T... values ) 71 { 72 return not( in( values ) ); 73 } 74 75 /** 76 * Creates a filter that returns true for any value NOT in the specified 77 * collection and false for all other cases. This is the equivalent 78 * of calling not(in(collection)). 79 */ notIn( Collection<? extends T> collection )80 public static <T> Filter<T> notIn( Collection<? extends T> collection ) 81 { 82 return not( in( collection ) ); 83 } 84 85 /** 86 * Creates a filter that returns true for inputs that are .equals() 87 * equivalent to the specified value. 88 */ equalTo( T value )89 public static <T> Filter<T> equalTo( T value ) 90 { 91 return new EqualToFilter<T>(value); 92 } 93 94 /** 95 * Creates a filter that returns true for inputs that are NOT .equals() 96 * equivalent to the specified value. This is the equivalent of calling 97 * not(equalTo(value)). 98 */ notEqualTo( T value )99 public static <T> Filter<T> notEqualTo( T value ) 100 { 101 return not(equalTo(value)); 102 } 103 104 /** 105 * Creates a filter that returns true when the specified delegate filter 106 * returns false, and vice versa. 107 */ not( Filter<T> f )108 public static <T> Filter<T> not( Filter<T> f ) 109 { 110 return new NotFilter<T>(f); 111 } 112 113 private static class EqualToFilter<T> implements Filter<T> 114 { 115 private T value; 116 EqualToFilter( T value )117 public EqualToFilter( T value ) 118 { 119 this.value = value; 120 } 121 apply( T input )122 public boolean apply( T input ) 123 { 124 return value == input || (value != null && value.equals(input)); 125 } 126 } 127 128 private static class InFilter<T> implements Filter<T> 129 { 130 private Collection<? extends T> collection; 131 InFilter( Collection<? extends T> collection )132 public InFilter( Collection<? extends T> collection ) 133 { 134 this.collection = collection; 135 } 136 apply( T input )137 public boolean apply( T input ) 138 { 139 return collection.contains(input); 140 } 141 } 142 143 private static class NotFilter<T> implements Filter<T> 144 { 145 private Filter<T> delegate; 146 NotFilter( Filter<T> delegate )147 public NotFilter( Filter<T> delegate ) 148 { 149 this.delegate = delegate; 150 } 151 apply( T input )152 public boolean apply( T input ) 153 { 154 return !delegate.apply(input); 155 } 156 } 157 } 158 159 160