J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1999 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 21 | * have any questions. |
| 22 | */ |
| 23 | |
| 24 | /* @test |
| 25 | * @bug 4151072 |
| 26 | * @summary Ensure that BufferedReader's methods handle the new line character |
| 27 | * following the carriage return correctly after a readLine |
| 28 | * operation that resulted in reading a line terminated by a |
| 29 | * carriage return (\r). |
| 30 | */ |
| 31 | import java.io.*; |
| 32 | |
| 33 | public class ReadLine { |
| 34 | |
| 35 | public static void main(String[] args) throws IOException { |
| 36 | // Make sure that the reader does not wait for additional characters to |
| 37 | // be read after reading a new line. |
| 38 | BufferedReader reader; |
| 39 | String[][] strings = { |
| 40 | {"CR/LF\r\n", "CR/LF"}, |
| 41 | {"LF-Only\n", "LF-Only"}, |
| 42 | {"CR-Only\r", "CR-Only"}, |
| 43 | {"CR/LF line\r\nMore data", "More data"} |
| 44 | }; |
| 45 | |
| 46 | // test 0 "CR/LF\r\n" |
| 47 | // test 1 "LF-Only\n" |
| 48 | // test 2 "CR-Only\r" |
| 49 | for (int i = 0; i < 3; i++) { |
| 50 | reader = new BufferedReader(new |
| 51 | BoundedReader(strings[i][0]), strings[i][0].length()); |
| 52 | if (!reader.readLine().equals(strings[i][1])) |
| 53 | throw new RuntimeException("Read incorrect text"); |
| 54 | } |
| 55 | |
| 56 | |
| 57 | // Now test the mark and reset operations. Consider two cases. |
| 58 | // 1. For lines ending with CR only. |
| 59 | markResetTest("Lot of textual data\rMore textual data\n", |
| 60 | "More textual data"); |
| 61 | |
| 62 | // 2. Now for lines ending with CR/LF |
| 63 | markResetTest("Lot of textual data\r\nMore textual data\n", |
| 64 | "More textual data"); |
| 65 | |
| 66 | // 3. Now for lines ending with LF only |
| 67 | markResetTest("Lot of textual data\nMore textual data\n", |
| 68 | "More textual data"); |
| 69 | |
| 70 | // Need to ensure behavior of read() after a readLine() read of a CR/LF |
| 71 | // terminated line. |
| 72 | // 1. For lines ending with CR/LF only. |
| 73 | |
| 74 | // uses "CR/LF line\r\nMore data" |
| 75 | reader = new BufferedReader(new |
| 76 | BoundedReader(strings[3][0]), strings[3][0].length()); |
| 77 | reader.readLine(); |
| 78 | if (reader.read() != 'M') |
| 79 | throw new RuntimeException("Read() failed"); |
| 80 | |
| 81 | |
| 82 | // Need to ensure that a read(char[], int, int) following a readLine() |
| 83 | // read of a CR/LF terminated line behaves correctly. |
| 84 | |
| 85 | // uses "CR/LF line\r\nMore data" |
| 86 | reader = new BufferedReader(new |
| 87 | BoundedReader(strings[3][0]), strings[3][0].length()); |
| 88 | reader.readLine(); |
| 89 | |
| 90 | char[] buf = new char[9]; |
| 91 | reader.read(buf, 0, 9); |
| 92 | String newStr = new String(buf); |
| 93 | if (!newStr.equals(strings[3][1])) |
| 94 | throw new RuntimeException("Read(char[],int,int) failed"); |
| 95 | } |
| 96 | |
| 97 | static void markResetTest(String inputStr, String resetStr) |
| 98 | throws IOException { |
| 99 | BufferedReader reader = new BufferedReader(new |
| 100 | BoundedReader(inputStr), inputStr.length()); |
| 101 | System.out.println("> " + reader.readLine()); |
| 102 | reader.mark(30); |
| 103 | System.out.println("......Marking stream ....."); |
| 104 | String str = reader.readLine(); |
| 105 | System.out.println("> " + str); |
| 106 | reader.reset(); |
| 107 | String newStr = reader.readLine(); |
| 108 | System.out.println("reset> " + newStr); |
| 109 | |
| 110 | // Make sure that the reset point was set correctly. |
| 111 | if (!newStr.equals(resetStr)) |
| 112 | throw new RuntimeException("Mark/Reset failed"); |
| 113 | } |
| 114 | |
| 115 | |
| 116 | private static class BoundedReader extends Reader{ |
| 117 | |
| 118 | private char[] content; |
| 119 | private int limit; |
| 120 | private int pos = 0; |
| 121 | |
| 122 | public BoundedReader(String content) { |
| 123 | this.limit = content.length(); |
| 124 | this.content = new char[limit]; |
| 125 | content.getChars(0, limit, this.content, 0); |
| 126 | } |
| 127 | |
| 128 | public int read() throws IOException { |
| 129 | if (pos >= limit) |
| 130 | throw new RuntimeException("Read past limit"); |
| 131 | return content[pos++]; |
| 132 | } |
| 133 | |
| 134 | public int read(char[] buf, int offset, int length) |
| 135 | throws IOException |
| 136 | { |
| 137 | int oldPos = pos; |
| 138 | for (int i = offset; i < length; i++) { |
| 139 | buf[i] = (char)read(); |
| 140 | } |
| 141 | return (pos - oldPos); |
| 142 | } |
| 143 | |
| 144 | public void close() {} |
| 145 | } |
| 146 | |
| 147 | } |