116 lines
3.4 KiB
Java
116 lines
3.4 KiB
Java
/*
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* Copyright (c) 2000, 2010, 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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* @summary Test read method of FileChannel
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*/
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import java.io.*;
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import java.nio.ByteBuffer;
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import java.nio.CharBuffer;
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import java.nio.channels.*;
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import java.nio.channels.FileChannel;
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import java.util.Random;
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/**
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* Testing FileChannel's mapping capabilities.
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*/
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public class Read {
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private static PrintStream err = System.err;
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private static Random generator = new Random();
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private static int CHARS_PER_LINE = File.separatorChar == '/' ? 5 : 6;
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private static File blah;
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public static void main(String[] args) throws Exception {
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StringBuffer sb = new StringBuffer();
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sb.setLength(4);
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blah = File.createTempFile("blah", null);
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blah.deleteOnExit();
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initTestFile(blah);
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FileInputStream fis = new FileInputStream(blah);
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FileChannel c = fis.getChannel();
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for (int x=0; x<1000; x++) {
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long offset = x * CHARS_PER_LINE;
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long expectedResult = offset / CHARS_PER_LINE;
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offset = expectedResult * CHARS_PER_LINE;
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ByteBuffer bleck = ByteBuffer.allocateDirect(CHARS_PER_LINE);
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c.read(bleck);
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for (int i=0; i<4; i++) {
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byte aByte = bleck.get(i);
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sb.setCharAt(i, (char)aByte);
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}
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int result = Integer.parseInt(sb.toString());
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if (result != expectedResult) {
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err.println("I expected "+expectedResult);
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err.println("I got "+ result);
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throw new Exception("Read test failed");
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}
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}
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c.close();
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fis.close();
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blah.delete();
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}
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/**
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* Creates file blah:
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* 0000
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* 0001
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* 0002
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* 0003
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* .
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* .
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* .
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* 3999
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*
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* Blah extends beyond a single page of memory so that the
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* ability to index into a file of multiple pages is tested.
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*/
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private static void initTestFile(File blah) throws Exception {
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FileOutputStream fos = new FileOutputStream(blah);
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BufferedWriter awriter
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= new BufferedWriter(new OutputStreamWriter(fos, "8859_1"));
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for(int i=0; i<4000; i++) {
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String number = new Integer(i).toString();
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for (int h=0; h<4-number.length(); h++)
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awriter.write("0");
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awriter.write(""+i);
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awriter.newLine();
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}
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awriter.flush();
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awriter.close();
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}
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}
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