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
18 package org.hipparchus.analysis.polynomials;
19
20
21 /** Class for handling Jacobi polynomials keys.
22 * @since 3.1
23 */
24 public class JacobiKey {
25
26 /** First exponent. */
27 private final int v;
28
29 /** Second exponent. */
30 private final int w;
31
32 /** Simple constructor.
33 * @param v first exponent
34 * @param w second exponent
35 */
36 public JacobiKey(final int v, final int w) {
37 this.v = v;
38 this.w = w;
39 }
40
41 /** Get hash code.
42 * @return hash code
43 */
44 @Override
45 public int hashCode() {
46 return (v << 16) ^ w;
47 }
48
49 /** Check if the instance represent the same key as another instance.
50 * @param key other key
51 * @return true if the instance and the other key refer to the same polynomial
52 */
53 @Override
54 public boolean equals(final Object key) {
55
56 if (!(key instanceof JacobiKey)) {
57 return false;
58 }
59
60 final JacobiKey otherK = (JacobiKey) key;
61 return (v == otherK.v) && (w == otherK.w);
62 }
63 }