148 lines
5.1 KiB
Java
148 lines
5.1 KiB
Java
/*
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* Copyright (c) 1999, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/* @test
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* @bug 4151072
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* @summary Ensure that BufferedReader's methods handle the new line character
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* following the carriage return correctly after a readLine
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* operation that resulted in reading a line terminated by a
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* carriage return (\r).
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*/
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import java.io.*;
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public class ReadLine {
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public static void main(String[] args) throws IOException {
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// Make sure that the reader does not wait for additional characters to
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// be read after reading a new line.
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BufferedReader reader;
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String[][] strings = {
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{"CR/LF\r\n", "CR/LF"},
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{"LF-Only\n", "LF-Only"},
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{"CR-Only\r", "CR-Only"},
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{"CR/LF line\r\nMore data", "More data"}
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};
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// test 0 "CR/LF\r\n"
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// test 1 "LF-Only\n"
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// test 2 "CR-Only\r"
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for (int i = 0; i < 3; i++) {
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reader = new BufferedReader(new
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BoundedReader(strings[i][0]), strings[i][0].length());
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if (!reader.readLine().equals(strings[i][1]))
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throw new RuntimeException("Read incorrect text");
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}
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// Now test the mark and reset operations. Consider two cases.
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// 1. For lines ending with CR only.
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markResetTest("Lot of textual data\rMore textual data\n",
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"More textual data");
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// 2. Now for lines ending with CR/LF
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markResetTest("Lot of textual data\r\nMore textual data\n",
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"More textual data");
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// 3. Now for lines ending with LF only
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markResetTest("Lot of textual data\nMore textual data\n",
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"More textual data");
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// Need to ensure behavior of read() after a readLine() read of a CR/LF
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// terminated line.
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// 1. For lines ending with CR/LF only.
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// uses "CR/LF line\r\nMore data"
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reader = new BufferedReader(new
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BoundedReader(strings[3][0]), strings[3][0].length());
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reader.readLine();
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if (reader.read() != 'M')
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throw new RuntimeException("Read() failed");
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// Need to ensure that a read(char[], int, int) following a readLine()
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// read of a CR/LF terminated line behaves correctly.
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// uses "CR/LF line\r\nMore data"
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reader = new BufferedReader(new
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BoundedReader(strings[3][0]), strings[3][0].length());
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reader.readLine();
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char[] buf = new char[9];
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reader.read(buf, 0, 9);
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String newStr = new String(buf);
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if (!newStr.equals(strings[3][1]))
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throw new RuntimeException("Read(char[],int,int) failed");
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}
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static void markResetTest(String inputStr, String resetStr)
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throws IOException {
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BufferedReader reader = new BufferedReader(new
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BoundedReader(inputStr), inputStr.length());
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System.out.println("> " + reader.readLine());
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reader.mark(30);
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System.out.println("......Marking stream .....");
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String str = reader.readLine();
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System.out.println("> " + str);
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reader.reset();
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String newStr = reader.readLine();
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System.out.println("reset> " + newStr);
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// Make sure that the reset point was set correctly.
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if (!newStr.equals(resetStr))
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throw new RuntimeException("Mark/Reset failed");
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}
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private static class BoundedReader extends Reader{
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private char[] content;
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private int limit;
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private int pos = 0;
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public BoundedReader(String content) {
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this.limit = content.length();
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this.content = new char[limit];
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content.getChars(0, limit, this.content, 0);
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}
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public int read() throws IOException {
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if (pos >= limit)
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throw new RuntimeException("Read past limit");
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return content[pos++];
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}
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public int read(char[] buf, int offset, int length)
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throws IOException
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{
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int oldPos = pos;
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for (int i = offset; i < length; i++) {
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buf[i] = (char)read();
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}
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return (pos - oldPos);
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}
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public void close() {}
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}
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}
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