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/*
* 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);
}
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