1 /*
2 * Licensed to the Hipparchus project 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 Hipparchus project 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 package org.hipparchus.complex;
18
19 import java.util.HashMap;
20 import java.util.Map;
21
22 import org.hipparchus.CalculusFieldElement;
23 import org.hipparchus.Field;
24
25 /**
26 * Representation of the complex numbers field.
27 *
28 * @param <T> the type of the field elements
29 * @see FieldComplex
30 * @since 2.0
31 */
32 public class FieldComplexField<T extends CalculusFieldElement<T>> implements Field<FieldComplex<T>> {
33
34 /** Cached fields. */
35 private static final Map<Field<?>, FieldComplexField<?>> CACHE = new HashMap<>();
36
37 /** Constant 0. */
38 private final FieldComplex<T> zero;
39
40 /** Constant 1. */
41 private final FieldComplex<T> one;
42
43 /** Simple constructor.
44 * @param field type of the field element
45 */
46 private FieldComplexField(final Field<T> field) {
47 zero = FieldComplex.getZero(field);
48 one = FieldComplex.getOne(field);
49 }
50
51 /** Get the field for complex numbers.
52 * @param partsField field for the real and imaginary parts
53 * @param <T> the type of the field elements
54 * @return cached field
55 */
56 public static <T extends CalculusFieldElement<T>> FieldComplexField<T> getField(final Field<T> partsField) {
57 FieldComplexField<?> cachedField;
58 synchronized (CACHE) {
59 cachedField = CACHE.get(partsField);
60 if (cachedField == null) {
61 cachedField = new FieldComplexField<>(partsField);
62 CACHE.put(partsField, cachedField);
63 }
64 }
65
66 @SuppressWarnings("unchecked")
67 final FieldComplexField<T> tCached = (FieldComplexField<T>) cachedField;
68 return tCached;
69
70 }
71
72 /** {@inheritDoc} */
73 @Override
74 public FieldComplex<T> getOne() {
75 return one;
76 }
77
78 /** {@inheritDoc} */
79 @Override
80 public FieldComplex<T> getZero() {
81 return zero;
82 }
83
84 /** {@inheritDoc} */
85 @SuppressWarnings("unchecked")
86 @Override
87 public Class<FieldComplex<T>> getRuntimeClass() {
88 return (Class<FieldComplex<T>>) getZero().getClass();
89 }
90
91 /** {@inheritDoc} */
92 @Override
93 public boolean equals(final Object other) {
94 return this == other;
95 }
96
97 /** {@inheritDoc} */
98 @Override
99 public int hashCode() {
100 return 0xd368f208;
101 }
102
103 }