1 /*

     2  * Copyright (c) 1999, 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 /* @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 }