de.unkrig.commons.lang.protocol.Predicate Maven / Gradle / Ivy

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/*
 * de.unkrig.commons - A general-purpose Java class library
 *
 * Copyright (c) 2011, Arno Unkrig
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
 * following conditions are met:
 *
 *    1. Redistributions of source code must retain the above copyright notice, this list of conditions and the
 *       following disclaimer.
 *    2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
 *       following disclaimer in the documentation and/or other materials provided with the distribution.
 *    3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote
 *       products derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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 */

package de.unkrig.commons.lang.protocol;

/**
 * An entity that tests whether a given "subject" of type {@code T} fulfils a particular condition.
 * 
 *   Notice: The phrase "the {@link Predicate} evaluates to x [ for y ]" is commonly used
 *   instead of "{@link #evaluate(Object)} returns x [ when invoked with argument y ]".
 * 
 * IMPORTANT NOTICE:
 * 
 *   When using this type in a variable, parameter or field declaration, never write:
 * 
 * Predicate<subject-type>
 * 
 *   , but always:
 * 
 * Predicate<? super subject-type>
 *
 * @param  The type of the subject parameter of the {@link #evaluate(Object)} method
 */
public
interface Predicate extends PredicateWhichThrows {
}