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