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 package org.hipparchus.util;
23
24 import java.io.Serializable;
25
26 import org.hipparchus.Field;
27
28 /**
29 * The field of {@link Binary64 double precision floating-point numbers}.
30 *
31 * @see Binary64
32 */
33 public class Binary64Field implements Field<Binary64>, Serializable {
34
35 /** Serializable version identifier */
36 private static final long serialVersionUID = 20161219L;
37
38 /** Default constructor. */
39 private Binary64Field() {
40 // Do nothing
41 }
42
43 /**
44 * Returns the unique instance of this class.
45 *
46 * @return the unique instance of this class
47 */
48 public static Binary64Field getInstance() {
49 return LazyHolder.INSTANCE;
50 }
51
52 /** {@inheritDoc} */
53 @Override
54 public Binary64 getZero() {
55 return Binary64.ZERO;
56 }
57
58 /** {@inheritDoc} */
59 @Override
60 public Binary64 getOne() {
61 return Binary64.ONE;
62 }
63
64 /** {@inheritDoc} */
65 @Override
66 public Class<Binary64> getRuntimeClass() {
67 return Binary64.class;
68 }
69
70 /** {@inheritDoc} */
71 @Override
72 public boolean equals(final Object other) {
73 return this == other;
74 }
75
76 /** {@inheritDoc} */
77 @Override
78 public int hashCode() {
79 return 0x0a04d2bf;
80 }
81
82 // CHECKSTYLE: stop HideUtilityClassConstructor
83 /** Holder for the instance.
84 * <p>We use here the Initialization On Demand Holder Idiom.</p>
85 */
86 private static class LazyHolder {
87 /** Cached field instance. */
88 private static final Binary64Field INSTANCE = new Binary64Field();
89 }
90 // CHECKSTYLE: resume HideUtilityClassConstructor
91
92 /** Handle deserialization of the singleton.
93 * @return the singleton instance
94 */
95 private Object readResolve() {
96 // return the singleton instance
97 return LazyHolder.INSTANCE;
98 }
99
100 }