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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
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 */
package org.apache.commons.collections4;

/**
 * Defines a functor interface implemented by classes that perform a predicate
 * test on an object.
 * 

* A Predicate is the object equivalent of an if statement. * It uses the input object to return a true or false value, and is often used in * validation or filtering. *

* Standard implementations of common predicates are provided by * {@link PredicateUtils}. These include true, false, instanceof, equals, and, * or, not, method invokation and null testing. * * @param the type that the predicate queries * * @since 1.0 * @version $Id: Predicate.java 1543262 2013-11-19 00:47:45Z ggregory $ */ public interface Predicate { /** * Use the specified parameter to perform a test that returns true or false. * * @param object the object to evaluate, should not be changed * @return true or false * @throws ClassCastException (runtime) if the input is the wrong class * @throws IllegalArgumentException (runtime) if the input is invalid * @throws FunctorException (runtime) if the predicate encounters a problem */ boolean evaluate(T object); }





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