001: // kelondroBufferedRA.java
002: // -----------------------
003: // part of The Kelondro Database
004: // (C) by Michael Peter Christen; mc@anomic.de
005: // first published on http://www.anomic.de
006: // Frankfurt, Germany, 2005
007: // last major change: 13.09.2005
008: //
009: // This program is free software; you can redistribute it and/or modify
010: // it under the terms of the GNU General Public License as published by
011: // the Free Software Foundation; either version 2 of the License, or
012: // (at your option) any later version.
013: //
014: // This program is distributed in the hope that it will be useful,
015: // but WITHOUT ANY WARRANTY; without even the implied warranty of
016: // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
017: // GNU General Public License for more details.
018: //
019: // You should have received a copy of the GNU General Public License
020: // along with this program; if not, write to the Free Software
021: // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
022: //
023: // Using this software in any meaning (reading, learning, copying, compiling,
024: // running) means that you agree that the Author(s) is (are) not responsible
025: // for cost, loss of data or any harm that may be caused directly or indirectly
026: // by usage of this softare or this documentation. The usage of this software
027: // is on your own risk. The installation and usage (starting/running) of this
028: // software may allow other people or application to access your computer and
029: // any attached devices and is highly dependent on the configuration of the
030: // software which must be done by the user of the software; the author(s) is
031: // (are) also not responsible for proper configuration and usage of the
032: // software, even if provoked by documentation provided together with
033: // the software.
034: //
035: // Any changes to this file according to the GPL as documented in the file
036: // gpl.txt aside this file in the shipment you received can be done to the
037: // lines that follows this copyright notice here, but changes must not be
038: // done inside the copyright notive above. A re-distribution must contain
039: // the intact and unchanged copyright notice.
040: // Contributions and changes to the program code must be marked as such.
041:
042: package de.anomic.kelondro;
043:
044: import java.io.IOException;
045: import de.anomic.server.serverByteBuffer;
046:
047: public class kelondroBufferedRA extends kelondroAbstractRA implements
048: kelondroRA {
049:
050: private serverByteBuffer sbb;
051: private long pos;
052:
053: public kelondroBufferedRA() {
054: sbb = new serverByteBuffer();
055: pos = 0;
056: }
057:
058: public kelondroBufferedRA(serverByteBuffer bb) {
059: sbb = bb;
060: pos = 0;
061: }
062:
063: public serverByteBuffer getBuffer() {
064: return this .sbb;
065: }
066:
067: public long available() throws IOException {
068: return Long.MAX_VALUE - sbb.length();
069: }
070:
071: public void close() throws IOException {
072: sbb = null;
073: }
074:
075: public long length() throws IOException {
076: return sbb.length();
077: }
078:
079: public int read() throws IOException {
080: return 0xff & sbb.byteAt((int) pos++);
081: }
082:
083: public int read(byte[] b, int off, int len) throws IOException {
084: byte[] g = sbb.getBytes((int) pos, len);
085: pos += g.length;
086: System.arraycopy(g, 0, b, off, g.length);
087: return g.length;
088: }
089:
090: public void seek(long pos) throws IOException {
091: this .pos = pos;
092: }
093:
094: public void write(int b) throws IOException {
095: this .sbb.overwrite((int) pos, b);
096: pos++;
097: }
098:
099: public void write(byte[] b, int off, int len) throws IOException {
100: this .sbb.overwrite((int) pos, b, off, len);
101: pos += len;
102: }
103:
104: }
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