98 lines
3.1 KiB
Java
98 lines
3.1 KiB
Java
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/*
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* Copyright 2000-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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/* @test
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* @bug 6191269
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* @summary Test truncate method of FileChannel
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*/
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import java.io.*;
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import java.nio.MappedByteBuffer;
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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 truncate method.
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*/
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public class Truncate {
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private static Random generator = new Random();
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private static File blah;
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public static void main(String[] args) throws Exception {
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blah = File.createTempFile("blah", null);
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blah.deleteOnExit();
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for(int i=0; i<100; i++) {
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long testSize = generator.nextInt(1000) + 10;
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initTestFile(blah, testSize);
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RandomAccessFile fis = new RandomAccessFile(blah, "rw");
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FileChannel c = fis.getChannel();
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if (c.size() != testSize)
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throw new RuntimeException("Size failed");
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long position = generator.nextInt((int)testSize);
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c.position(position);
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long newSize = generator.nextInt((int)testSize);
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c.truncate(newSize);
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if (c.size() != newSize)
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throw new RuntimeException("Truncate failed");
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if (position > newSize) {
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if (c.position() != newSize)
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throw new RuntimeException("Position greater than size");
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} else {
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if (c.position() != position)
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throw new RuntimeException("Truncate changed position");
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}
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c.close();
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fis.close();
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}
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blah.delete();
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}
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/**
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* Creates file blah of specified size in bytes.
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*
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*/
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private static void initTestFile(File blah, long size) throws Exception {
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if (blah.exists())
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blah.delete();
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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<size; i++) {
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awriter.write("e");
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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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