1 /*
2 * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 import java.nio.CharBuffer;
25 import java.util.Iterator;
26 import java.util.Set;
27 import java.util.TreeSet;
28 import org.testng.Assert;
29 import org.testng.annotations.Test;
30
31 /**
32 * @test
33 * @bug 8137326
34 * @summary Test to verify the compare method for the CharSequence class.
35 * @run testng Comparison
36 */
37 public class Comparison {
38 static char SEP = ':';
39
40 static String[][] books = {
41 {"Biography", "Steve Jobs"},
42 {"Biography", "Elon Musk: Tesla, SpaceX, and the Quest for a Fantastic Future"},
43 {"Law", "Law 101: Everything You Need to Know About American Law, Fourth Edition"},
44 {"Law", "The Tools of Argument: How the Best Lawyers Think, Argue, and Win"},
45 {"History", "The History Book (Big Ideas Simply Explained)"},
46 {"History", "A People's History of the United States"},
47 };
48
49 /**
50 * Verifies the compare method by comparing StringBuilder objects with String
51 * objects.
52 */
53 @Test
54 public void compareWithString() {
55 Set<StringBuilder> sbSet = constructSBSet();
56 Set<String> sSet = constructStringSet();
57 Iterator<StringBuilder> iSB = sbSet.iterator();
58 Iterator<String> iS = sSet.iterator();
59 while (iSB.hasNext()) {
60 int result = CharSequence.compare(iSB.next(), iS.next());
61
62 Assert.assertTrue(result == 0, "Comparing item by item");
63 }
64 }
65
66 /**
67 * Verify comparison between two CharSequence implementations, including String,
68 * StringBuffer and StringBuilder.
69 *
70 * Note: CharBuffer states that "A char buffer is not comparable to any other type of object."
71 */
72 @Test
73 public void testCompare() {
74 StringBuilder sb1 = generateTestBuilder(65, 70, 97, 102);
75 StringBuilder sb2 = generateTestBuilder(65, 70, 97, 102);
76 StringBuilder sb3 = generateTestBuilder(65, 71, 97, 103);
77
78 Assert.assertTrue(CharSequence.compare(sb1, sb2) == 0, "Compare between StringBuilders");
79 Assert.assertFalse(CharSequence.compare(sb1, sb3) == 0, "Compare between StringBuilders");
80
81 Assert.assertTrue(CharSequence.compare(sb1, sb2.toString()) == 0, "Compare between a StringBuilder and String");
82 Assert.assertFalse(CharSequence.compare(sb1, sb3.toString()) == 0, "Compare between a StringBuilder and String");
83
84 StringBuffer buf1 = generateTestBuffer(65, 70, 97, 102);
85 StringBuffer buf2 = generateTestBuffer(65, 70, 97, 102);
86 StringBuffer buf3 = generateTestBuffer(65, 71, 97, 103);
87
88 Assert.assertTrue(CharSequence.compare(buf1, buf2) == 0, "Compare between StringBuffers");
89 Assert.assertFalse(CharSequence.compare(buf1, buf3) == 0, "Compare between StringBuffers");
90
91 Assert.assertTrue(CharSequence.compare(sb1, buf2) == 0, "Compare between a StringBuilder and StringBuffer");
92 Assert.assertFalse(CharSequence.compare(sb1, buf3) == 0, "Compare between a StringBuilder and StringBuffer");
93
94 CharSequence cs1 = (CharSequence)buf1;
95 CharSequence cs2 = (CharSequence)sb1;
96 @SuppressWarnings("unchecked")
97 int result = ((Comparable<Object>)cs1).compareTo(buf2);
98 Assert.assertTrue(result == 0, "Compare between a StringBuilder and StringBuffer");
99 }
100
101
102 private Set<String> constructStringSet() {
103 Set<String> sSet = new TreeSet<>();
104 for (String[] book : books) {
105 sSet.add(book[0] + SEP + book[1]);
106 }
107 return sSet;
108 }
109
110 private Set<StringBuilder> constructSBSet() {
111 Set<StringBuilder> sbSet = new TreeSet<>();
112 for (String[] book : books) {
113 sbSet.add(new StringBuilder(book[0]).append(SEP).append(book[1]));
114 }
115 return sbSet;
116 }
117
118 private static StringBuilder generateTestBuilder(int from1, int to1,
119 int from2, int to2) {
120 StringBuilder aBuffer = new StringBuilder(50);
121
122 for (int i = from1; i < to1; i++) {
123 aBuffer.append((char)i);
124 }
125 for (int i = from2; i < to2; i++) {
126 aBuffer.append((char)i);
127 }
128 return aBuffer;
129 }
130
131 private static StringBuffer generateTestBuffer(int from1, int to1,
132 int from2, int to2) {
133 StringBuffer aBuffer = new StringBuffer(50);
134
135 for (int i = from1; i < to1; i++) {
136 aBuffer.append((char)i);
137 }
138 for (int i = from2; i < to2; i++) {
139 aBuffer.append((char)i);
140 }
141 return aBuffer;
142 }
143 }