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// Tags: JDK1.4
// Copyright (C) 2004 Free Software Foundation, Inc.
// Written by Mark Wielaard (mark@klomp.org)
// This file is part of Mauve.
// Mauve is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2, or (at your option)
// any later version.
// Mauve is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Mauve; see the file COPYING. If not, write to
// the Free Software Foundation, 59 Temple Place - Suite 330,
// Boston, MA 02111-1307, USA. */
package gnu.testlet.java.nio.channels.FileChannel;
import java.io.*;
import java.nio.*;
import java.nio.channels.*;
import gnu.testlet.Testlet;
import gnu.testlet.TestHarness;
public class truncate implements Testlet
{
public void test (TestHarness harness)
{
String tmpfile = harness.getTempDirectory()
+ File.separator + "mauve-trunc.tst";
File f = new File(tmpfile);
f.delete();
try
{
RandomAccessFile raf = new RandomAccessFile(f, "rw");
FileChannel fc = raf.getChannel();
harness.check(fc.size(), 0);
harness.check(fc.position(), 0);
ByteBuffer bb;
bb = ByteBuffer.wrap(new byte[] {1, 2, 3, 4, 5, 6, 7, 8});
harness.check(fc.write(bb), 8);
harness.check(fc.size(), 8);
harness.check(fc.position(), 8);
// Truncate
fc.truncate(3);
harness.check(fc.size(), 3);
harness.check(fc.position(), 3);
// End of file
harness.check(fc.read(ByteBuffer.allocate(1)), -1);
harness.check(3, fc.size());
// Expand with write
bb = ByteBuffer.allocate(1);
bb.put((byte) 10);
bb.flip();
harness.check(fc.write(bb), 1);
harness.check(fc.size(), 4);
harness.check(fc.position(), 4);
// Expand with truncate (shouldn't work)
fc.truncate(10);
harness.check(fc.size(), 4);
harness.check(fc.position(), 4);
// Set position and truncate just after (end of file)
fc.position(3);
fc.truncate(4);
harness.check(fc.size(), 4);
harness.check(fc.position(), 3);
// Truncate before file position and file end
fc.truncate(1);
harness.check(fc.size(), 1);
harness.check(fc.position(), 1);
}
catch(IOException ioe)
{
harness.fail("Unexpected: " + ioe);
harness.debug(ioe);
}
finally
{
// Cleanup
f.delete();
}
}
}
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