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89 lines
2.6 KiB
89 lines
2.6 KiB
// kelondroBufferedRA.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, 2005
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// last major change: 13.09.2005
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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.IOException;
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import de.anomic.kelondro.util.ByteBuffer;
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public class BufferedRandomAccess extends AbstractRandomAccess implements RandomAccessInterface {
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private ByteBuffer sbb;
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private long pos;
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public BufferedRandomAccess() {
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sbb = new ByteBuffer();
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pos = 0;
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}
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public BufferedRandomAccess(final ByteBuffer bb) {
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sbb = bb;
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pos = 0;
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}
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public ByteBuffer getBuffer() {
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return this.sbb;
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}
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public long available() throws IOException {
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return Integer.MAX_VALUE - sbb.length();
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}
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public void close() throws IOException {
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sbb = null;
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}
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public long length() throws IOException {
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return sbb.length();
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}
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public void setLength(long length) throws IOException {
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sbb.resize((int) length);
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}
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public int read() throws IOException {
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return 0xff & sbb.byteAt((int) pos++);
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}
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public void readFully(final byte[] b, final int off, final int len) throws IOException {
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final byte[] g = sbb.getBytes((int) pos, len);
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pos += g.length;
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System.arraycopy(g, 0, b, off, g.length);
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}
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public void seek(final long pos) throws IOException {
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this.pos = pos;
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}
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public void write(final int b) throws IOException {
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this.sbb.overwrite((int) pos, b);
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pos++;
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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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this.sbb.overwrite((int) pos, b, off, len);
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pos += len;
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}
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}
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