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 * https://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
18 /*
19 * This is not the original file distributed by the Apache Software Foundation
20 * It has been modified by the Hipparchus project
21 */
22
23 package org.hipparchus.fraction;
24
25 import java.io.Serializable;
26
27 import org.hipparchus.Field;
28
29 /**
30 * Representation of the fractional numbers field.
31 * <p>
32 * This class is a singleton.
33 * </p>
34 * @see Fraction
35 */
36 public class FractionField implements Field<Fraction>, Serializable {
37
38 /** Serializable version identifier */
39 private static final long serialVersionUID = -1257768487499119313L;
40
41 /** Private constructor for the singleton.
42 */
43 private FractionField() {
44 }
45
46 /** Get the unique instance.
47 * @return the unique instance
48 */
49 public static FractionField getInstance() {
50 return LazyHolder.INSTANCE;
51 }
52
53 /** {@inheritDoc} */
54 @Override
55 public Fraction getOne() {
56 return Fraction.ONE;
57 }
58
59 /** {@inheritDoc} */
60 @Override
61 public Fraction getZero() {
62 return Fraction.ZERO;
63 }
64
65 /** {@inheritDoc} */
66 @Override
67 public Class<Fraction> getRuntimeClass() {
68 return Fraction.class;
69 }
70
71 /** {@inheritDoc} */
72 @Override
73 public boolean equals(final Object other) {
74 return this == other;
75 }
76
77 /** {@inheritDoc} */
78 @Override
79 public int hashCode() {
80 return 0xac885ac5;
81 }
82
83 // CHECKSTYLE: stop HideUtilityClassConstructor
84 /** Holder for the instance.
85 * <p>We use here the Initialization On Demand Holder Idiom.</p>
86 */
87 private static class LazyHolder {
88 /** Cached field instance. */
89 private static final FractionField INSTANCE = new FractionField();
90 }
91 // CHECKSTYLE: resume HideUtilityClassConstructor
92
93 /** Handle deserialization of the singleton.
94 * @return the singleton instance
95 */
96 private Object readResolve() {
97 // return the singleton instance
98 return LazyHolder.INSTANCE;
99 }
100
101 }