blob: bc3a7e9f9ff090291e85139ec23585d2d6cd1f30 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
|
/*
* 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.math.fraction;
import java.io.Serializable;
import org.apache.commons.math.Field;
/**
* Representation of the fractional numbers without any overflow field.
* <p>
* This class is a singleton.
* </p>
* @see Fraction
* @version $Revision: 811827 $ $Date: 2009-09-06 17:32:50 +0200 (dim. 06 sept. 2009) $
* @since 2.0
*/
public class BigFractionField implements Field<BigFraction>, Serializable {
/** Serializable version identifier */
private static final long serialVersionUID = -1699294557189741703L;
/** Private constructor for the singleton.
*/
private BigFractionField() {
}
/** Get the unique instance.
* @return the unique instance
*/
public static BigFractionField getInstance() {
return LazyHolder.INSTANCE;
}
/** {@inheritDoc} */
public BigFraction getOne() {
return BigFraction.ONE;
}
/** {@inheritDoc} */
public BigFraction getZero() {
return BigFraction.ZERO;
}
// CHECKSTYLE: stop HideUtilityClassConstructor
/** Holder for the instance.
* <p>We use here the Initialization On Demand Holder Idiom.</p>
*/
private static class LazyHolder {
/** Cached field instance. */
private static final BigFractionField INSTANCE = new BigFractionField();
}
// CHECKSTYLE: resume HideUtilityClassConstructor
/** Handle deserialization of the singleton.
* @return the singleton instance
*/
private Object readResolve() {
// return the singleton instance
return LazyHolder.INSTANCE;
}
}
|
