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/*
Copyright (c) 2012 James Ahlborn
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA
*/
package com.healthmarketscience.jackcess.util;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.channels.NonWritableChannelException;
import java.util.Arrays;
import junit.framework.TestCase;
import com.healthmarketscience.jackcess.DatabaseTest;
/**
*
* @author James Ahlborn
*/
public class MemFileChannelTest extends TestCase
{
public MemFileChannelTest(String name) {
super(name);
}
public void testReadOnlyChannel() throws Exception
{
File testFile = new File("src/test/data/V1997/compIndexTestV1997.mdb");
MemFileChannel ch = MemFileChannel.newChannel(testFile, "r");
assertEquals(testFile.length(), ch.size());
assertEquals(0L, ch.position());
try {
ByteBuffer bb = ByteBuffer.allocate(1024);
ch.write(bb);
fail("NonWritableChannelException should have been thrown");
} catch(NonWritableChannelException ignored) {
// success
}
try {
ch.truncate(0L);
fail("NonWritableChannelException should have been thrown");
} catch(NonWritableChannelException ignored) {
// success
}
try {
ch.transferFrom(null, 0L, 10L);
fail("NonWritableChannelException should have been thrown");
} catch(NonWritableChannelException ignored) {
// success
}
assertEquals(testFile.length(), ch.size());
assertEquals(0L, ch.position());
ch.close();
}
public void testChannel() throws Exception
{
ByteBuffer bb = ByteBuffer.allocate(1024);
MemFileChannel ch = MemFileChannel.newChannel();
assertTrue(ch.isOpen());
assertEquals(0L, ch.size());
assertEquals(0L, ch.position());
assertEquals(-1, ch.read(bb));
ch.close();
assertFalse(ch.isOpen());
File testFile = new File("src/test/data/V1997/compIndexTestV1997.mdb");
ch = MemFileChannel.newChannel(testFile, "r");
assertEquals(testFile.length(), ch.size());
assertEquals(0L, ch.position());
try {
ch.position(-1);
fail("IllegalArgumentException should have been thrown");
} catch(IllegalArgumentException ignored) {
// success
}
MemFileChannel ch2 = MemFileChannel.newChannel();
ch.transferTo(ch2);
ch2.force(true);
assertEquals(testFile.length(), ch2.size());
assertEquals(testFile.length(), ch2.position());
try {
ch2.truncate(-1L);
fail("IllegalArgumentException should have been thrown");
} catch(IllegalArgumentException ignored) {
// success
}
long trucSize = ch2.size()/3;
ch2.truncate(trucSize);
assertEquals(trucSize, ch2.size());
assertEquals(trucSize, ch2.position());
ch2.position(0L);
copy(ch, ch2, bb);
File tmpFile = File.createTempFile("chtest_", ".dat");
tmpFile.deleteOnExit();
FileOutputStream fc = new FileOutputStream(tmpFile);
ch2.transferTo(fc);
fc.close();
assertEquals(testFile.length(), tmpFile.length());
assertTrue(Arrays.equals(DatabaseTest.toByteArray(testFile),
DatabaseTest.toByteArray(tmpFile)));
ch2.truncate(0L);
assertTrue(ch2.isOpen());
assertEquals(0L, ch2.size());
assertEquals(0L, ch2.position());
assertEquals(-1, ch2.read(bb));
ch2.close();
assertFalse(ch2.isOpen());
}
private static void copy(FileChannel src, FileChannel dst, ByteBuffer bb)
throws IOException
{
src.position(0L);
while(true) {
bb.clear();
if(src.read(bb) < 0) {
break;
}
bb.flip();
dst.write(bb);
}
}
}
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