/* * Copyright (c) 2015, 2025, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ import java.util.Arrays; import org.testng.annotations.Test; import static org.testng.Assert.assertEquals; import static org.testng.Assert.assertTrue; /* * @test * @bug 8054307 8077559 8351443 * @summary Tests Compact String. This test is testing StringBuilder * behavior related to Compact String. * @run testng/othervm -XX:+CompactStrings CompactStringBuilder * @run testng/othervm -XX:-CompactStrings CompactStringBuilder * @run testng/othervm -Xcomp CompactStringBuilder */ public class CompactStringBuilder { /* * Tests for "A" */ @Test public void testCompactStringBuilderForLatinA() { final String ORIGIN = "A"; /* * Because right now ASCII is the default encoding parameter for source * code in JDK build environment, so we escape them. same as below. */ check(new StringBuilder(ORIGIN).append(new char[] { '\uFF21' }), "A\uFF21"); check(new StringBuilder(ORIGIN).append(new StringBuffer("\uFF21")), "A\uFF21"); check(new StringBuilder(ORIGIN).append("\uFF21"), "A\uFF21"); check(new StringBuilder(ORIGIN).append(new char[] { 'a', 'b', 'c'}), "Aabc"); check(new StringBuilder(ORIGIN).append(new char[] { 'a', 'b', 'c'}, 1, 2), "Abc"); check(new StringBuilder(ORIGIN).append(new StringBuffer("\uFF21")), "A\uFF21"); check(new StringBuilder(ORIGIN).delete(0, 1), ""); check(new StringBuilder(ORIGIN).delete(0, 0), "A"); check(new StringBuilder(ORIGIN).deleteCharAt(0), ""); assertEquals(new StringBuilder(ORIGIN).indexOf("A", 0), 0); assertEquals(new StringBuilder(ORIGIN).indexOf("\uFF21", 0), -1); assertEquals(new StringBuilder(ORIGIN).indexOf("", 0), 0); assertEquals(new StringBuilder(ORIGIN).insert(1, "\uD801\uDC00") .indexOf("A", 0), 0); assertEquals(new StringBuilder(ORIGIN).insert(0, "\uD801\uDC00") .indexOf("A", 0), 2); check(new StringBuilder(ORIGIN).insert(0, new char[] {}), "A"); check(new StringBuilder(ORIGIN).insert(1, new char[] { '\uFF21' }), "A\uFF21"); check(new StringBuilder(ORIGIN).insert(0, new char[] { '\uFF21' }), "\uFF21A"); check(new StringBuilder(ORIGIN).insert(0, new StringBuffer("\uFF21")), "\uFF21A"); check(new StringBuilder(ORIGIN).insert(1, new StringBuffer("\uFF21")), "A\uFF21"); check(new StringBuilder(ORIGIN).insert(0, ""), "A"); check(new StringBuilder(ORIGIN).insert(0, "\uFF21"), "\uFF21A"); check(new StringBuilder(ORIGIN).insert(1, "\uFF21"), "A\uFF21"); assertEquals(new StringBuilder(ORIGIN).lastIndexOf("A"), 0); assertEquals(new StringBuilder(ORIGIN).lastIndexOf("\uFF21"), -1); assertEquals(new StringBuilder(ORIGIN).lastIndexOf(""), 1); check(new StringBuilder(ORIGIN).replace(0, 0, "\uFF21"), "\uFF21A"); check(new StringBuilder(ORIGIN).replace(0, 1, "\uFF21"), "\uFF21"); checkSetCharAt(new StringBuilder(ORIGIN), 0, '\uFF21', "\uFF21"); checkSetLength(new StringBuilder(ORIGIN), 0, ""); checkSetLength(new StringBuilder(ORIGIN), 1, "A"); check(new StringBuilder(ORIGIN).substring(0), "A"); check(new StringBuilder(ORIGIN).substring(1), ""); } /* * Tests for "\uFF21" */ @Test public void testCompactStringBuilderForNonLatinA() { final String ORIGIN = "\uFF21"; check(new StringBuilder(ORIGIN).append(new char[] { 'A' }), "\uFF21A"); check(new StringBuilder(ORIGIN).append(new StringBuffer("A")), "\uFF21A"); check(new StringBuilder(ORIGIN).append("A"), "\uFF21A"); check(new StringBuilder(ORIGIN).append(new StringBuffer("A")), "\uFF21A"); check(new StringBuilder(ORIGIN).delete(0, 1), ""); check(new StringBuilder(ORIGIN).delete(0, 0), "\uFF21"); check(new StringBuilder(ORIGIN).deleteCharAt(0), ""); assertEquals(new StringBuilder(ORIGIN).indexOf("A", 0), -1); assertEquals(new StringBuilder(ORIGIN).indexOf("\uFF21", 0), 0); assertEquals(new StringBuilder(ORIGIN).indexOf("", 0), 0); check(new StringBuilder(ORIGIN).insert(0, new char[] {}), "\uFF21"); check(new StringBuilder(ORIGIN).insert(1, new char[] { 'A' }), "\uFF21A"); check(new StringBuilder(ORIGIN).insert(0, new char[] { 'A' }), "A\uFF21"); check(new StringBuilder(ORIGIN).insert(0, new StringBuffer("A")), "A\uFF21"); check(new StringBuilder(ORIGIN).insert(1, new StringBuffer("A")), "\uFF21A"); check(new StringBuilder(ORIGIN).insert(0, ""), "\uFF21"); check(new StringBuilder(ORIGIN).insert(0, "A"), "A\uFF21"); check(new StringBuilder(ORIGIN).insert(1, "A"), "\uFF21A"); assertEquals(new StringBuilder(ORIGIN).lastIndexOf("A"), -1); assertEquals(new StringBuilder(ORIGIN).lastIndexOf("\uFF21"), 0); assertEquals(new StringBuilder(ORIGIN).lastIndexOf(""), 1); check(new StringBuilder(ORIGIN).replace(0, 0, "A"), "A\uFF21"); check(new StringBuilder(ORIGIN).replace(0, 1, "A"), "A"); checkSetCharAt(new StringBuilder(ORIGIN), 0, 'A', "A"); checkSetLength(new StringBuilder(ORIGIN), 0, ""); checkSetLength(new StringBuilder(ORIGIN), 1, "\uFF21"); check(new StringBuilder(ORIGIN).substring(0), "\uFF21"); check(new StringBuilder(ORIGIN).substring(1), ""); } /* * Tests for "\uFF21A" */ @Test public void testCompactStringBuilderForMixedA1() { final String ORIGIN = "\uFF21A"; check(new StringBuilder(ORIGIN).delete(0, 1), "A"); check(new StringBuilder(ORIGIN).delete(1, 2), "\uFF21"); check(new StringBuilder(ORIGIN).deleteCharAt(1), "\uFF21"); check(new StringBuilder(ORIGIN).deleteCharAt(0), "A"); assertEquals(new StringBuilder(ORIGIN).indexOf("A", 0), 1); assertEquals(new StringBuilder(ORIGIN).indexOf("\uFF21", 0), 0); assertEquals(new StringBuilder(ORIGIN).indexOf("", 0), 0); check(new StringBuilder(ORIGIN).insert(1, new char[] { 'A' }), "\uFF21AA"); check(new StringBuilder(ORIGIN).insert(0, new char[] { '\uFF21' }), "\uFF21\uFF21A"); assertEquals(new StringBuilder(ORIGIN).lastIndexOf("A"), 1); assertEquals(new StringBuilder(ORIGIN).lastIndexOf("\uFF21"), 0); assertEquals(new StringBuilder(ORIGIN).lastIndexOf(""), 2); check(new StringBuilder(ORIGIN).replace(0, 0, "A"), "A\uFF21A"); check(new StringBuilder(ORIGIN).replace(0, 1, "A"), "AA"); checkSetCharAt(new StringBuilder(ORIGIN), 0, 'A', "AA"); checkSetLength(new StringBuilder(ORIGIN), 0, ""); checkSetLength(new StringBuilder(ORIGIN), 1, "\uFF21"); check(new StringBuilder(ORIGIN).substring(0), "\uFF21A"); check(new StringBuilder(ORIGIN).substring(1), "A"); } /* * Tests for "A\uFF21" */ @Test public void testCompactStringBuilderForMixedA2() { final String ORIGIN = "A\uFF21"; check(new StringBuilder(ORIGIN).replace(1, 2, "A"), "AA"); checkSetLength(new StringBuilder(ORIGIN), 1, "A"); check(new StringBuilder(ORIGIN).substring(0), "A\uFF21"); check(new StringBuilder(ORIGIN).substring(1), "\uFF21"); check(new StringBuilder(ORIGIN).substring(0, 1), "A"); } /* * Tests for "\uFF21A\uFF21A\uFF21A\uFF21A\uFF21A" */ @Test public void testCompactStringBuilderForDuplicatedMixedA1() { final String ORIGIN = "\uFF21A\uFF21A\uFF21A\uFF21A\uFF21A"; checkSetLength(new StringBuilder(ORIGIN), 1, "\uFF21"); assertEquals(new StringBuilder(ORIGIN).indexOf("A", 5), 5); assertEquals(new StringBuilder(ORIGIN).indexOf("\uFF21", 5), 6); assertEquals(new StringBuilder(ORIGIN).lastIndexOf("A"), 9); assertEquals(new StringBuilder(ORIGIN).lastIndexOf("\uFF21"), 8); assertEquals(new StringBuilder(ORIGIN).lastIndexOf(""), 10); check(new StringBuilder(ORIGIN).substring(9), "A"); check(new StringBuilder(ORIGIN).substring(8), "\uFF21A"); } /* * Tests for "A\uFF21A\uFF21A\uFF21A\uFF21A\uFF21" */ @Test public void testCompactStringBuilderForDuplicatedMixedA2() { final String ORIGIN = "A\uFF21A\uFF21A\uFF21A\uFF21A\uFF21"; checkSetLength(new StringBuilder(ORIGIN), 1, "A"); assertEquals(new StringBuilder(ORIGIN).indexOf("A", 5), 6); assertEquals(new StringBuilder(ORIGIN).indexOf("\uFF21", 5), 5); assertEquals(new StringBuilder(ORIGIN).lastIndexOf("A"), 8); assertEquals(new StringBuilder(ORIGIN).lastIndexOf("\uFF21"), 9); check(new StringBuilder(ORIGIN).substring(9), "\uFF21"); check(new StringBuilder(ORIGIN).substring(8), "A\uFF21"); } /* * Tests for "\uD801\uDC00\uD801\uDC01" */ @Test public void testCompactStringForSupplementaryCodePoint() { final String ORIGIN = "\uD801\uDC00\uD801\uDC01"; check(new StringBuilder(ORIGIN).append("A"), "\uD801\uDC00\uD801\uDC01A"); check(new StringBuilder(ORIGIN).append("\uFF21"), "\uD801\uDC00\uD801\uDC01\uFF21"); check(new StringBuilder(ORIGIN).appendCodePoint('A'), "\uD801\uDC00\uD801\uDC01A"); check(new StringBuilder(ORIGIN).appendCodePoint('\uFF21'), "\uD801\uDC00\uD801\uDC01\uFF21"); assertEquals(new StringBuilder(ORIGIN).charAt(0), '\uD801'); assertEquals(new StringBuilder(ORIGIN).codePointAt(0), Character.codePointAt(ORIGIN, 0)); assertEquals(new StringBuilder(ORIGIN).codePointAt(1), Character.codePointAt(ORIGIN, 1)); assertEquals(new StringBuilder(ORIGIN).codePointBefore(2), Character.codePointAt(ORIGIN, 0)); assertEquals(new StringBuilder(ORIGIN).codePointCount(1, 3), 2); check(new StringBuilder(ORIGIN).delete(0, 2), "\uD801\uDC01"); check(new StringBuilder(ORIGIN).delete(0, 3), "\uDC01"); check(new StringBuilder(ORIGIN).deleteCharAt(1), "\uD801\uD801\uDC01"); checkGetChars(new StringBuilder(ORIGIN), 0, 3, new char[] { '\uD801', '\uDC00', '\uD801' }); assertEquals(new StringBuilder(ORIGIN).indexOf("\uD801\uDC01"), 2); assertEquals(new StringBuilder(ORIGIN).indexOf("\uDC01"), 3); assertEquals(new StringBuilder(ORIGIN).indexOf("\uFF21"), -1); assertEquals(new StringBuilder(ORIGIN).indexOf("A"), -1); check(new StringBuilder(ORIGIN).insert(0, "\uFF21"), "\uFF21\uD801\uDC00\uD801\uDC01"); check(new StringBuilder(ORIGIN).insert(1, "\uFF21"), "\uD801\uFF21\uDC00\uD801\uDC01"); check(new StringBuilder(ORIGIN).insert(1, "A"), "\uD801A\uDC00\uD801\uDC01"); assertEquals(new StringBuilder(ORIGIN).lastIndexOf("\uDC00\uD801"), 1); assertEquals(new StringBuilder(ORIGIN).lastIndexOf("\uD801"), 2); assertEquals(new StringBuilder(ORIGIN).lastIndexOf("\uFF21"), -1); assertEquals(new StringBuilder(ORIGIN).lastIndexOf("A"), -1); assertEquals(new StringBuilder(ORIGIN).length(), 4); assertEquals(new StringBuilder(ORIGIN).offsetByCodePoints(1, 1), 2); assertEquals(new StringBuilder(ORIGIN).offsetByCodePoints(0, 1), 2); check(new StringBuilder(ORIGIN).replace(0, 2, "A"), "A\uD801\uDC01"); check(new StringBuilder(ORIGIN).replace(0, 3, "A"), "A\uDC01"); check(new StringBuilder(ORIGIN).replace(0, 2, "\uFF21"), "\uFF21\uD801\uDC01"); check(new StringBuilder(ORIGIN).replace(0, 3, "\uFF21"), "\uFF21\uDC01"); check(new StringBuilder(ORIGIN).reverse(), "\uD801\uDC01\uD801\uDC00"); checkSetCharAt(new StringBuilder(ORIGIN), 1, '\uDC01', "\uD801\uDC01\uD801\uDC01"); checkSetCharAt(new StringBuilder(ORIGIN), 1, 'A', "\uD801A\uD801\uDC01"); checkSetLength(new StringBuilder(ORIGIN), 2, "\uD801\uDC00"); checkSetLength(new StringBuilder(ORIGIN), 3, "\uD801\uDC00\uD801"); check(new StringBuilder(ORIGIN).substring(1, 3), "\uDC00\uD801"); } /* * Tests for "A\uD801\uDC00\uFF21" */ @Test public void testCompactStringForSupplementaryCodePointMixed1() { final String ORIGIN = "A\uD801\uDC00\uFF21"; assertEquals(new StringBuilder(ORIGIN).codePointBefore(3), Character.codePointAt(ORIGIN, 1)); assertEquals(new StringBuilder(ORIGIN).codePointBefore(2), '\uD801'); assertEquals(new StringBuilder(ORIGIN).codePointBefore(1), 'A'); assertEquals(new StringBuilder(ORIGIN).codePointCount(0, 3), 2); assertEquals(new StringBuilder(ORIGIN).codePointCount(0, 4), 3); check(new StringBuilder(ORIGIN).delete(0, 1), "\uD801\uDC00\uFF21"); check(new StringBuilder(ORIGIN).delete(0, 1).delete(2, 3), "\uD801\uDC00"); check(new StringBuilder(ORIGIN).deleteCharAt(3).deleteCharAt(0), "\uD801\uDC00"); assertEquals(new StringBuilder(ORIGIN).indexOf("\uFF21"), 3); assertEquals(new StringBuilder(ORIGIN).indexOf("A"), 0); assertEquals(new StringBuilder(ORIGIN).lastIndexOf("\uFF21"), 3); assertEquals(new StringBuilder(ORIGIN).lastIndexOf("A"), 0); assertEquals(new StringBuilder(ORIGIN).offsetByCodePoints(0, 1), 1); assertEquals(new StringBuilder(ORIGIN).offsetByCodePoints(1, 1), 3); check(new StringBuilder(ORIGIN).replace(1, 3, "A"), "AA\uFF21"); check(new StringBuilder(ORIGIN).replace(1, 4, "A"), "AA"); check(new StringBuilder(ORIGIN).replace(1, 4, ""), "A"); check(new StringBuilder(ORIGIN).reverse(), "\uFF21\uD801\uDC00A"); checkSetLength(new StringBuilder(ORIGIN), 1, "A"); check(new StringBuilder(ORIGIN).substring(0, 1), "A"); } /* * Tests for "\uD801\uDC00\uFF21A" */ @Test public void testCompactStringForSupplementaryCodePointMixed2() { final String ORIGIN = "\uD801\uDC00\uFF21A"; assertEquals(new StringBuilder(ORIGIN).codePointBefore(3), Character.codePointAt(ORIGIN, 2)); assertEquals(new StringBuilder(ORIGIN).codePointBefore(2), Character.codePointAt(ORIGIN, 0)); assertEquals(new StringBuilder(ORIGIN).codePointBefore(1), '\uD801'); assertEquals(new StringBuilder(ORIGIN).codePointCount(0, 3), 2); assertEquals(new StringBuilder(ORIGIN).codePointCount(0, 4), 3); check(new StringBuilder(ORIGIN).delete(0, 2), "\uFF21A"); check(new StringBuilder(ORIGIN).delete(0, 3), "A"); check(new StringBuilder(ORIGIN).deleteCharAt(0).deleteCharAt(0) .deleteCharAt(0), "A"); assertEquals(new StringBuilder(ORIGIN).indexOf("A"), 3); assertEquals(new StringBuilder(ORIGIN).delete(0, 3).indexOf("A"), 0); assertEquals(new StringBuilder(ORIGIN).replace(0, 3, "B").indexOf("A"), 1); assertEquals(new StringBuilder(ORIGIN).substring(3, 4).indexOf("A"), 0); assertEquals(new StringBuilder(ORIGIN).offsetByCodePoints(1, 1), 2); assertEquals(new StringBuilder(ORIGIN).offsetByCodePoints(0, 1), 2); assertEquals(new StringBuilder(ORIGIN).offsetByCodePoints(2, 1), 3); check(new StringBuilder(ORIGIN).replace(0, 3, "B"), "BA"); check(new StringBuilder(ORIGIN).reverse(), "A\uFF21\uD801\uDC00"); } /* * Tests for "\uD801A\uDC00\uFF21" */ @Test public void testCompactStringForSupplementaryCodePointMixed3() { final String ORIGIN = "\uD801A\uDC00\uFF21"; assertEquals(new StringBuilder(ORIGIN).codePointAt(1), 'A'); assertEquals(new StringBuilder(ORIGIN).codePointAt(3), '\uFF21'); assertEquals(new StringBuilder(ORIGIN).codePointBefore(1), '\uD801'); assertEquals(new StringBuilder(ORIGIN).codePointBefore(2), 'A'); assertEquals(new StringBuilder(ORIGIN).codePointBefore(3), '\uDC00'); assertEquals(new StringBuilder(ORIGIN).codePointCount(0, 3), 3); assertEquals(new StringBuilder(ORIGIN).codePointCount(1, 3), 2); assertEquals(new StringBuilder(ORIGIN).delete(0, 1).delete(1, 3) .indexOf("A"), 0); assertEquals( new StringBuilder(ORIGIN).replace(0, 1, "B").replace(2, 4, "C") .indexOf("A"), 1); assertEquals(new StringBuilder(ORIGIN).substring(1, 4).substring(0, 1) .indexOf("A"), 0); assertEquals(new StringBuilder(ORIGIN).offsetByCodePoints(0, 1), 1); assertEquals(new StringBuilder(ORIGIN).offsetByCodePoints(1, 1), 2); assertEquals(new StringBuilder(ORIGIN).offsetByCodePoints(2, 1), 3); check(new StringBuilder(ORIGIN).reverse(), "\uFF21\uDC00A\uD801"); } /* * Tests for "A\uDC01\uFF21\uD801" */ @Test public void testCompactStringForSupplementaryCodePointMixed4() { final String ORIGIN = "A\uDC01\uFF21\uD801"; assertEquals(new StringBuilder(ORIGIN).codePointAt(1), '\uDC01'); assertEquals(new StringBuilder(ORIGIN).codePointAt(3), '\uD801'); assertEquals(new StringBuilder(ORIGIN).codePointBefore(1), 'A'); assertEquals(new StringBuilder(ORIGIN).codePointBefore(2), '\uDC01'); assertEquals(new StringBuilder(ORIGIN).codePointBefore(3), '\uFF21'); assertEquals(new StringBuilder(ORIGIN).codePointCount(0, 3), 3); assertEquals(new StringBuilder(ORIGIN).codePointCount(1, 3), 2); assertEquals(new StringBuilder(ORIGIN).delete(1, 4).indexOf("A"), 0); assertEquals(new StringBuilder(ORIGIN).replace(1, 4, "B").indexOf("A"), 0); assertEquals(new StringBuilder(ORIGIN).substring(0, 1).indexOf("A"), 0); assertEquals(new StringBuilder(ORIGIN).offsetByCodePoints(0, 1), 1); assertEquals(new StringBuilder(ORIGIN).offsetByCodePoints(1, 1), 2); assertEquals(new StringBuilder(ORIGIN).offsetByCodePoints(2, 1), 3); check(new StringBuilder(ORIGIN).reverse(), "\uD801\uFF21\uDC01A"); } /* * Tests for maybeLatin1 attribute */ @Test public void testCompactStringForMaybeLatin1() { StringBuilder sb = new StringBuilder("A\uDC01"); sb.setLength(0); // maybeLatin1 become true check(sb, ""); check(new StringBuilder(sb).append('A'), "A"); check(new StringBuilder().append(sb), ""); sb = new StringBuilder("A\uDC01"); sb.setCharAt(1, 'B'); // maybeLatin1 become true check(sb, "AB"); check(new StringBuilder(sb).append('A'), "ABA"); check(new StringBuilder().append(sb), "AB"); sb = new StringBuilder("A\uDC01"); sb.deleteCharAt(1); // maybeLatin1 become true check(sb, "A"); check(new StringBuilder(sb).append('B'), "AB"); check(new StringBuilder().append(sb), "A"); sb = new StringBuilder("A\uDC01\uFF21\uD801"); sb.delete(1, 4); check(sb, "A"); // maybeLatin1 become true check(new StringBuilder(sb).append('B'), "AB"); check(new StringBuilder().append(sb), "A"); sb = new StringBuilder("A\uDC01\uFF21\uD801"); sb.replace(1, 4, "B"); check(sb, "AB"); // maybeLatin1 become true check(new StringBuilder(sb).append('A'), "ABA"); check(new StringBuilder().append(sb), "AB"); } // Test cases to force expanding the capacity during replace. // Start with a known capacity and a known initial value that almost fills it. // Use both latin1 and utf16 initial values and replacement values. // Iterate through cases of SB.replace start and end values and various lengths of replacement. // The results are checked by composing the new string using concatenation of the segments. @Test public void testGrowingCapacityReplace() { final int INIT_CAPACITY = 8; final String[] INITIAL_CHARS = {"A", "\u0100"}; final String[] REPLACEMENT_CHARS = {"B", "\u0101"}; for (String INITIAL : INITIAL_CHARS) { for (String REPLACEMENT : REPLACEMENT_CHARS) { for (int initLen = INIT_CAPACITY - 1; initLen < INIT_CAPACITY + 2; initLen++) { final String orig = INITIAL.repeat(initLen); for (int start = INIT_CAPACITY - 4; start < orig.length(); start++) { for (int end = start; end < orig.length(); end++) { for (int insLen = 0; insLen < 2; insLen++) { final String repl = REPLACEMENT.repeat(insLen); var sb = new StringBuilder(INIT_CAPACITY) .append(orig); int capBefore = sb.capacity(); sb.replace(start, end, repl); int capAfter = sb.capacity(); String expected = genReplacementString(orig, start, end, repl); try { check(sb, expected); } catch (Throwable ex) { System.out.printf("repl: \"%s\", actual: %s, expected: %s%n", repl, sb, expected); System.out.printf(" insLen: %d, gap: %d, beforeLen: %d, afterLen: %d, capBefore: %d, capAfter: %d%n", insLen, (end - start), orig.length(), sb.length(), capBefore, capAfter); throw ex; } } } } } } } } // Construct the replacement string using string concat of the segments private static String genReplacementString(String orig, int start, int end, String repl) { return orig.substring(0, start) + repl + orig.substring(end, orig.length()); } private void checkGetChars(StringBuilder sb, int srcBegin, int srcEnd, char expected[]) { char[] dst = new char[srcEnd - srcBegin]; sb.getChars(srcBegin, srcEnd, dst, 0); assertTrue(Arrays.equals(dst, expected)); } private void checkSetCharAt(StringBuilder sb, int index, char ch, String expected) { sb.setCharAt(index, ch); check(sb, expected); } private void checkSetLength(StringBuilder sb, int newLength, String expected) { sb.setLength(newLength); check(sb, expected); } private void check(StringBuilder sb, String expected) { check(sb.toString(), expected); } private void check(String str, String expected) { assertTrue(str.equals(expected), String.format( "Get (%s) but expect (%s), ", escapeNonASCIIs(str), escapeNonASCIIs(expected))); } /* * Escape non-ASCII characters since not all systems support them. */ private String escapeNonASCIIs(String str) { StringBuilder sb = new StringBuilder(); for (int i = 0; i < str.length(); i++) { char c = str.charAt(i); if (c > 0x7F) { sb.append("\\u").append(Integer.toHexString((int) c)); } else { sb.append(c); } } return sb.toString(); } }