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/*
* Copyright (c) 2000, 2011, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/* @test
* @bug 4429043 6526860
* @summary Test position method of FileChannel
* @key randomness
*/
import java.io.*;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.file.*;
import static java.nio.file.StandardOpenOption.*;
import java.nio.charset.Charset;
import java.util.Random;
/**
* Testing FileChannel's position method.
*/
public class Position {
private static final Charset ISO8859_1 = Charset.forName("8859_1");
private static final Random generator = new Random();
public static void main(String[] args) throws Exception {
Path blah = Files.createTempFile("blah", null);
blah.toFile().deleteOnExit();
initTestFile(blah);
for (int i=0; i<10; i++) {
try (FileChannel fc = (generator.nextBoolean()) ?
FileChannel.open(blah, READ) :
new FileInputStream(blah.toFile()).getChannel()) {
for (int j=0; j<100; j++) {
long newPos = generator.nextInt(1000);
fc.position(newPos);
if (fc.position() != newPos)
throw new RuntimeException("Position failed");
}
}
}
for (int i=0; i<10; i++) {
try (FileChannel fc = (generator.nextBoolean()) ?
FileChannel.open(blah, APPEND) :
new FileOutputStream(blah.toFile(), true).getChannel()) {
for (int j=0; j<10; j++) {
if (fc.position() != fc.size())
throw new RuntimeException("Position expected to be size");
byte[] buf = new byte[generator.nextInt(100)];
fc.write(ByteBuffer.wrap(buf));
}
}
}
Files.delete(blah);
}
/**
* Creates file blah:
* 0000
* 0001
* 0002
* 0003
* .
* .
* .
* 3999
*
*/
private static void initTestFile(Path blah) throws IOException {
try (BufferedWriter awriter = Files.newBufferedWriter(blah, ISO8859_1)) {
for(int i=0; i<4000; i++) {
String number = new Integer(i).toString();
for (int h=0; h<4-number.length(); h++)
awriter.write("0");
awriter.write(""+i);
awriter.newLine();
}
}
}
}
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