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 * http://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.apache.commons.text.similarity;
19
20 import java.util.Objects;
21
22 /**
23 * Scores the similarity between two {@link CharSequence}s.
24 */
25 final class SimilarityCharacterInput implements SimilarityInput<Character> {
26
27 /**
28 * Source.
29 */
30 private final CharSequence cs;
31
32 SimilarityCharacterInput(final CharSequence cs) {
33 if (cs == null) {
34 throw new IllegalArgumentException("CharSequence");
35 }
36 this.cs = cs;
37 }
38
39 @Override
40 public Character at(final int index) {
41 // Character.valueOf caches character <= 127.
42 return Character.valueOf(cs.charAt(index));
43 }
44
45 @Override
46 public boolean equals(final Object obj) {
47 if (this == obj) {
48 return true;
49 }
50 if (obj == null) {
51 return false;
52 }
53 if (getClass() != obj.getClass()) {
54 return false;
55 }
56 final SimilarityCharacterInput other = (SimilarityCharacterInput) obj;
57 return Objects.equals(cs, other.cs);
58 }
59
60 @Override
61 public int hashCode() {
62 return Objects.hash(cs);
63 }
64
65 @Override
66 public int length() {
67 return cs.length();
68 }
69
70 @Override
71 public String toString() {
72 return cs.toString();
73 }
74 }