1 /* |
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2 * CDDL HEADER START |
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3 * |
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4 * The contents of this file are subject to the terms of the |
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5 * Common Development and Distribution License (the "License"). |
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6 * You may not use this file except in compliance with the License. |
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7 * |
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8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE |
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9 * or http://www.opensolaris.org/os/licensing. |
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10 * See the License for the specific language governing permissions |
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11 * and limitations under the License. |
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12 * |
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13 * When distributing Covered Code, include this CDDL HEADER in each |
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14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. |
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15 * If applicable, add the following below this CDDL HEADER, with the |
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16 * fields enclosed by brackets "[]" replaced with your own identifying |
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17 * information: Portions Copyright [yyyy] [name of copyright owner] |
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18 * |
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19 * CDDL HEADER END |
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20 */ |
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21 |
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22 /* |
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23 * Copyright (c) 2009, 2012, Oracle and/or its affiliates. All rights reserved. |
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24 */ |
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25 |
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26 package com.oracle.solaris.vp.util.misc.predicate; |
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27 |
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28 /** |
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29 * The {@code FalsePredicate<T>} class is a {@code Predicate} that always |
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30 * returns {@code false}. The {@link #getInstance} method is the preferred way |
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31 * to get an instance of this class. |
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32 */ |
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33 public class FalsePredicate<T> implements Predicate<T> { |
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34 // |
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35 // Static data |
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36 // |
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37 |
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38 private static final FalsePredicate<Object> instance = |
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39 new FalsePredicate<Object>(); |
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40 |
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41 // |
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42 // Predicate methods |
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43 // |
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44 |
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45 /** |
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46 * Returns false. |
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47 * |
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48 * @param o |
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49 * the object to ignore |
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50 * |
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51 * @return {@code false} |
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52 */ |
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53 @Override |
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54 public boolean test(T o) { |
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55 return (false); |
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56 } |
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57 |
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58 // |
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59 // Static methods |
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60 // |
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61 |
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62 /** |
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63 * Gets a type-safe, immutable, singleton instance of this class. |
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64 */ |
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65 @SuppressWarnings({"unchecked"}) |
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66 public static <T> FalsePredicate<T> getInstance() { |
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67 return (FalsePredicate<T>)instance; |
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68 } |
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69 } |
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