Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
Functor |
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| 1.0;1 |
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 | * Functor marker interface. All provided functor interfaces extend this interface. | |
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: 647297 $ $Date: 2008-04-11 22:14:50 +0200 (Fri, 11 Apr 2008) $ | |
28 | */ | |
29 | public interface Functor { | |
30 | ||
31 | /** | |
32 | * Returns a human readable description of this functor. | |
33 | * Implementators are strongly encouraged but not | |
34 | * strictly required to override the default {@link Object} | |
35 | * implementation of this method. | |
36 | * | |
37 | * @return a human readable description of this functor | |
38 | */ | |
39 | String toString(); | |
40 | ||
41 | /** | |
42 | * Returns a hash code for this functor adhering to the | |
43 | * general {@link Object#hashCode Object.hashCode} contract. | |
44 | * Implementators are strongly encouraged but not | |
45 | * strictly required to override the default {@link Object} | |
46 | * implementation of this method. | |
47 | * | |
48 | * @see #equals | |
49 | * @return a hash code for this functor | |
50 | */ | |
51 | int hashCode(); | |
52 | ||
53 | /** | |
54 | * Indicates whether some other object is "equal to" | |
55 | * this functor. This method must adhere to | |
56 | * general {@link Object#equals Object.equals} contract. | |
57 | * Additionally, this method can return | |
58 | * <tt>true</tt> <i>only</i> if the specified Object implements | |
59 | * the same functor interface and is known to produce the same | |
60 | * results and/or side-effects for the same arguments (if any). | |
61 | * <p> | |
62 | * While implementators are strongly encouraged to override | |
63 | * the default Object implementation of this method, | |
64 | * note that the default Object implementation | |
65 | * does in fact adhere to the functor <code>equals</code> contract. | |
66 | * </p> | |
67 | * @param that the object to compare this functor to | |
68 | * @see #hashCode | |
69 | * @return <code>true</code> iff the given object implements | |
70 | * this functor interface, and is known to produce the same | |
71 | * results and/or side-effects for the same arguments | |
72 | * (if any). | |
73 | */ | |
74 | boolean equals(Object that); | |
75 | } |