1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.commons.functor;
18
19 /**
20 * A functor that takes no arguments and returns a <code>boolean</code> value.
21 * <p>
22 * Implementors are encouraged but not required to make their functors
23 * {@link java.io.Serializable Serializable}.
24 * </p>
25 *
26 * @since 1.0
27 * @version $Revision: 1345136 $ $Date: 2012-06-01 09:47:06 -0300 (Fri, 01 Jun 2012) $
28 */
29 public interface Predicate extends NullaryFunctor {
30 /**
31 * Evaluate this predicate.
32 * @return the result of this test
33 */
34 boolean test();
35 }