/*

  * 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

  * limitations under the License.

  */

 package org.apache.commons.functor;

 /**

  * A functor that takes no arguments and returns a <code>boolean</code> value.

  * <p>

  * Implementors are encouraged but not required to make their functors

  * {@link java.io.Serializable Serializable}.

  * </p>

  *

  * @since 1.0

  * @version $Revision: 647290 $ $Date: 2008-04-11 22:08:44 +0200 (Fri, 11 Apr 2008) $

  * @author Rodney Waldhoff

  */

 public interface Predicate extends NullaryFunctor {

     /**

      * Evaluate this predicate.

      * @return the result of this test

      */

     boolean test();

 }