| /* |
| * Copyright 2000-2007 Sun Microsystems, Inc. All Rights Reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| * CA 95054 USA or visit www.sun.com if you need additional information or |
| * have any questions. |
| */ |
| |
| /* @test |
| * @bug 6191269 |
| * @summary Test truncate method of FileChannel |
| */ |
| |
| import java.io.*; |
| import java.nio.MappedByteBuffer; |
| import java.nio.channels.*; |
| import java.nio.channels.FileChannel; |
| import java.util.Random; |
| |
| |
| /** |
| * Testing FileChannel's truncate method. |
| */ |
| |
| public class Truncate { |
| |
| private static Random generator = new Random(); |
| |
| private static File blah; |
| |
| public static void main(String[] args) throws Exception { |
| blah = File.createTempFile("blah", null); |
| blah.deleteOnExit(); |
| for(int i=0; i<100; i++) { |
| long testSize = generator.nextInt(1000) + 10; |
| initTestFile(blah, testSize); |
| RandomAccessFile fis = new RandomAccessFile(blah, "rw"); |
| FileChannel c = fis.getChannel(); |
| if (c.size() != testSize) |
| throw new RuntimeException("Size failed"); |
| |
| long position = generator.nextInt((int)testSize); |
| c.position(position); |
| |
| long newSize = generator.nextInt((int)testSize); |
| c.truncate(newSize); |
| |
| if (c.size() != newSize) |
| throw new RuntimeException("Truncate failed"); |
| |
| if (position > newSize) { |
| if (c.position() != newSize) |
| throw new RuntimeException("Position greater than size"); |
| } else { |
| if (c.position() != position) |
| throw new RuntimeException("Truncate changed position"); |
| } |
| |
| c.close(); |
| fis.close(); |
| } |
| blah.delete(); |
| } |
| |
| /** |
| * Creates file blah of specified size in bytes. |
| * |
| */ |
| private static void initTestFile(File blah, long size) throws Exception { |
| if (blah.exists()) |
| blah.delete(); |
| FileOutputStream fos = new FileOutputStream(blah); |
| BufferedWriter awriter |
| = new BufferedWriter(new OutputStreamWriter(fos, "8859_1")); |
| |
| for(int i=0; i<size; i++) { |
| awriter.write("e"); |
| } |
| awriter.flush(); |
| awriter.close(); |
| } |
| } |