| /* |
| * Copyright (c) 2010, 2011, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /** |
| * Determines if the input object matches some criteria. |
| * |
| * <p>All predicate implementations are expected to: |
| * <ul> |
| * <li>Provide stable results such that for any {@code t} the result of two |
| * {@code eval} operations are always equivalent. ie.<pre> |
| * boolean one = predicate.test(a); |
| * boolean two = predicate.test(a); |
| * |
| * assert one == two; |
| * </pre></li> |
| * <li>Equivalent input objects should map to equivalent output objects. ie.<pre> |
| * assert a.equals(b); // a and b are equivalent |
| * |
| * boolean x = predicate.test(a); |
| * boolean y = predicate.test(ab; |
| * |
| * assert x == y; // their test results should be the same. |
| * </pre></li> |
| * <li>The predicate should not modify the input object in any way that would |
| * change the evaluation.</li> |
| * <li>When used for aggregate operations upon many elements predicates |
| * should not assume that the {@code test} operation will be called upon |
| * elements in any specific order.</li> |
| * </ul> |
| * |
| * @param <T> the type of input objects provided to {@code test}. |
| */ |
| public interface TPredicate<T> { |
| |
| /** |
| * Return {@code true} if the input object matches some criteria. |
| * |
| * @param t the input object. |
| * @return {@code true} if the input object matched some criteria. |
| */ |
| boolean test(T t); |
| } |