git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@6161 6c8d7289-2bf4-0310-a012-ef5d649a1542pull/1/head
orbiter
16 years ago
parent
160031758d
commit
409538e17a
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// kelondroFileRA.java
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// -----------------------
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// part of The Kelondro Database
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// (C) by Michael Peter Christen; mc@yacy.net
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// first published on http://www.anomic.de
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// Frankfurt, Germany, 2004
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// last major change: 05.02.2004
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package de.anomic.kelondro.io;
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import java.io.File;
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import java.io.FileNotFoundException;
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import java.io.IOException;
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import java.io.RandomAccessFile;
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import java.nio.ByteBuffer;
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import java.nio.channels.FileChannel;
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public final class ChannelRandomAccess extends AbstractRandomAccess implements RandomAccessInterface {
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private FileChannel channel;
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private RandomAccessFile raf;
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public ChannelRandomAccess(final File file) throws IOException, FileNotFoundException {
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this.name = file.getName();
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this.file = file;
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this.raf = new RandomAccessFile(file, "rw");
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this.channel = raf.getChannel();
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}
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public long length() throws IOException {
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return channel.size();
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}
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public void setLength(long length) throws IOException {
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channel.truncate(length);
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}
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public long available() throws IOException {
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return channel.size() - channel.position();
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}
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public final void readFully(final byte[] b, final int off, final int len) throws IOException {
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ByteBuffer bb = ByteBuffer.wrap(b);
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channel.read(bb);
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}
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public void write(final byte[] b, final int off, final int len) throws IOException {
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ByteBuffer bb = ByteBuffer.wrap(b, off, len);
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channel.write(bb);
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}
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public void seek(final long pos) throws IOException {
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channel.position(pos);
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}
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public void close() throws IOException {
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channel.close();
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raf.close();
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}
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protected void finalize() throws Throwable {
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if (channel != null) {
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this.close();
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}
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super.finalize();
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}
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}
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