19066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/* 29066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Copyright (C) 2008 The Android Open Source Project 39066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 49066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Licensed under the Apache License, Version 2.0 (the "License"); 59066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * you may not use this file except in compliance with the License. 69066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * You may obtain a copy of the License at 79066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 89066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 99066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Unless required by applicable law or agreed to in writing, software 119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * See the License for the specific language governing permissions and 149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * limitations under the License. 159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpackage com.android.internal.util; 189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.util.Arrays; 209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/** 229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Predicates contains static methods for creating the standard set of 239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@code Predicate} objects. 249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpublic class Predicates { 269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private Predicates() { 289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Returns a Predicate that evaluates to true iff each of its components 329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * evaluates to true. The components are evaluated in order, and evaluation 339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * will be "short-circuited" as soon as the answer is determined. 349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static <T> Predicate<T> and(Predicate<? super T>... components) { 369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return and(Arrays.asList(components)); 379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Returns a Predicate that evaluates to true iff each of its components 419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * evaluates to true. The components are evaluated in order, and evaluation 429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * will be "short-circuited" as soon as the answer is determined. Does not 439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * defensively copy the iterable passed in, so future changes to it will alter 449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the behavior of this Predicate. If components is empty, the returned 459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Predicate will always evaluate to true. 469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static <T> Predicate<T> and(Iterable<? extends Predicate<? super T>> components) { 489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return new AndPredicate(components); 499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Returns a Predicate that evaluates to true iff any one of its components 539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * evaluates to true. The components are evaluated in order, and evaluation 549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * will be "short-circuited" as soon as the answer is determined. 559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static <T> Predicate<T> or(Predicate<? super T>... components) { 579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return or(Arrays.asList(components)); 589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Returns a Predicate that evaluates to true iff any one of its components 629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * evaluates to true. The components are evaluated in order, and evaluation 639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * will be "short-circuited" as soon as the answer is determined. Does not 649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * defensively copy the iterable passed in, so future changes to it will alter 659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the behavior of this Predicate. If components is empty, the returned 669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Predicate will always evaluate to false. 679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static <T> Predicate<T> or(Iterable<? extends Predicate<? super T>> components) { 699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return new OrPredicate(components); 709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Returns a Predicate that evaluates to true iff the given Predicate 749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * evaluates to false. 759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static <T> Predicate<T> not(Predicate<? super T> predicate) { 779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return new NotPredicate<T>(predicate); 789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private static class AndPredicate<T> implements Predicate<T> { 819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private final Iterable<? extends Predicate<? super T>> components; 829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private AndPredicate(Iterable<? extends Predicate<? super T>> components) { 849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project this.components = components; 859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean apply(T t) { 889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (Predicate<? super T> predicate : components) { 899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!predicate.apply(t)) { 909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private static class OrPredicate<T> implements Predicate<T> { 989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private final Iterable<? extends Predicate<? super T>> components; 999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private OrPredicate(Iterable<? extends Predicate<? super T>> components) { 1019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project this.components = components; 1029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean apply(T t) { 1059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (Predicate<? super T> predicate : components) { 1069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (predicate.apply(t)) { 1079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 1089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 1119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private static class NotPredicate<T> implements Predicate<T> { 1159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private final Predicate<? super T> predicate; 1169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private NotPredicate(Predicate<? super T> predicate) { 1189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project this.predicate = predicate; 1199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean apply(T t) { 1229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return !predicate.apply(t); 1239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 126