/*
* Copyright 2001-2004 The Apache Software Foundation
*
* Licensed 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
* limitations under the License.
*/
package org.apache.commons.collections;
/**
* Defines a functor interface implemented by classes that perform a predicate
* test on an object.
* <p>
* A <code>Predicate</code> is the object equivalent of an <code>if</code> statement.
* It uses the input object to return a true or false value, and is often used in
* validation or filtering.
* <p>
* Standard implementations of common predicates are provided by
* {@link PredicateUtils}. These include true, false, instanceof, equals, and,
* or, not, method invokation and null testing.
*
* @since Commons Collections 1.0
* @version $Revision: 155406 $ $Date: 2005-02-26 12:55:26 +0000 (Sat, 26 Feb 2005) $
*
* @author James Strachan
* @author Stephen Colebourne
*/
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
*/
public boolean evaluate(Object object);
}