// kelondroAbstractRA.java
// -----------------------
// part of The Kelondro Database
// (C) by Michael Peter Christen; mc@anomic.de
// first published on http://www.anomic.de
// Frankfurt, Germany, 2004
//
// $LastChangedDate$
// $LastChangedRevision$
// $LastChangedBy$
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program 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 for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
// Using this software in any meaning (reading, learning, copying, compiling,
// running) means that you agree that the Author(s) is (are) not responsible
// for cost, loss of data or any harm that may be caused directly or indirectly
// by usage of this softare or this documentation. The usage of this software
// is on your own risk. The installation and usage (starting/running) of this
// software may allow other people or application to access your computer and
// any attached devices and is highly dependent on the configuration of the
// software which must be done by the user of the software; the author(s) is
// (are) also not responsible for proper configuration and usage of the
// software, even if provoked by documentation provided together with
// the software.
//
// Any changes to this file according to the GPL as documented in the file
// gpl.txt aside this file in the shipment you received can be done to the
// lines that follows this copyright notice here, but changes must not be
// done inside the copyright notive above. A re-distribution must contain
// the intact and unchanged copyright notice.
// Contributions and changes to the program code must be marked as such.
package de.anomic.kelondro;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import de.anomic.server.serverByteBuffer;
abstract class kelondroAbstractRA implements kelondroRA {
// logging support
protected String name = null;
public String name() {
return name;
}
// pseudo-native methods:
abstract public long length() throws IOException;
abstract public long available() throws IOException;
abstract public int read() throws IOException;
abstract public void write(int b) throws IOException;
abstract public int read(byte[] b, int off, int len) throws IOException;
abstract public void write(byte[] b, int off, int len) throws IOException;
abstract public void seek(long pos) throws IOException;
abstract public void close() throws IOException;
// derived methods:
public void readFully(byte[] b, int off, int len) throws IOException {
if (len < 0) throw new IndexOutOfBoundsException("length is negative:" + len);
if (b.length < off + len) throw new IndexOutOfBoundsException("bounds do not fit: b.length=" + b.length + ", off=" + off + ", len=" + len);
while (len > 0) {
int r = read(b, off, len);
if (r < 0) throw new IOException("EOF"); // read exceeded EOF
off += r;
len -= r;
}
}
public byte[] readFully() throws IOException {
ByteArrayOutputStream dest = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int c, total = 0;
while ((c = read(buffer, 0, 1024)) > 0) {
dest.write(buffer, 0, c);
total += c;
}
dest.flush();
dest.close();
return dest.toByteArray();
}
public byte readByte() throws IOException {
final int ch = this.read();
if (ch < 0) throw new IOException();
return (byte)(ch);
}
public void writeByte(final int v) throws IOException {
this.write(v);
}
public short readShort() throws IOException {
final int ch1 = this.read();
final int ch2 = this.read();
if ((ch1 | ch2) < 0) throw new IOException();
return (short) ((ch1 << 8) | (ch2 << 0));
}
public void writeShort(final int v) throws IOException {
this.write((v >>> 8) & 0xFF); this.write((v >>> 0) & 0xFF);
}
public int readInt() throws IOException {
final int ch1 = this.read();
final int ch2 = this.read();
final int ch3 = this.read();
final int ch4 = this.read();
if ((ch1 | ch2 | ch3 | ch4) < 0) throw new IOException("kelondroAbstractRA.readInt: wrong values; ch1=" + ch1 + ", ch2=" + ch2 + ", ch3=" + ch3 + ", ch4=" + ch4);
return ((ch1 << 24) | (ch2 << 16) | (ch3 << 8) | ch4);
}
public void writeInt(final int v) throws IOException {
this.write((v >>> 24) & 0xFF); this.write((v >>> 16) & 0xFF);
this.write((v >>> 8) & 0xFF); this.write((v >>> 0) & 0xFF);
}
public long readLong() throws IOException {
return ((long) (readInt()) << 32) | (readInt() & 0xFFFFFFFFL);
}
public void writeLong(final long v) throws IOException {
this.write((int) (v >>> 56) & 0xFF); this.write((int) (v >>> 48) & 0xFF);
this.write((int) (v >>> 40) & 0xFF); this.write((int) (v >>> 32) & 0xFF);
this.write((int) (v >>> 24) & 0xFF); this.write((int) (v >>> 16) & 0xFF);
this.write((int) (v >>> 8) & 0xFF); this.write((int) (v >>> 0) & 0xFF);
}
public void write(final byte[] b) throws IOException {
this.write(b, 0, b.length);
}
private static final byte cr = 13;
private static final byte lf = 10;
public void writeLine(final String line) throws IOException {
byte[] b = new byte[line.length() + 2];
System.arraycopy(line.getBytes(), 0, b, 0, line.length());
b[b.length - 2] = cr;
b[b.length - 1] = lf;
this.write(b);
}
public void writeLine(final byte[] line) throws IOException {
byte[] b = new byte[line.length + 2];
System.arraycopy(line, 0, b, 0, line.length);
b[b.length - 2] = cr;
b[b.length - 1] = lf;
this.write(b);
}
public String readLine() throws IOException {
// with these functions, we consider a line as always terminated by CRLF
byte[] bb = new byte[80];
int bbsize = 0;
int c;
while (true) {
c = read();
if (c < 0) {
if (bbsize == 0) return null;
return new String(bb, 0, bbsize);
}
if (c == cr) continue;
if (c == lf) return new String(bb, 0, bbsize, "UTF-8");
// append to bb
if (bbsize == bb.length) {
// extend bb size
byte[] newbb = new byte[bb.length * 2];
System.arraycopy(bb, 0, newbb, 0, bb.length);
bb = newbb;
newbb = null;
}
bb[bbsize++] = (byte) c;
}
}
public void writeMap(final Map<String, String> map, final String comment) throws IOException {
this.seek(0);
final Iterator<Map.Entry<String, String>> iter = map.entrySet().iterator();
Map.Entry<String, String> entry;
final serverByteBuffer bb = new serverByteBuffer(map.size() * 40);
bb.append("# ").append(comment).append("\r\n");
while (iter.hasNext()) {
entry = iter.next();
bb.append(entry.getKey()).append('=');
if (entry.getValue() != null) { bb.append(entry.getValue()); }
bb.append("\r\n");
}
bb.append("# EOF\r\n");
write(bb.getBytes());
}
public HashMap<String, String> readMap() throws IOException {
this.seek(0);
byte[] b = readFully();
BufferedReader br = new BufferedReader(new InputStreamReader(new ByteArrayInputStream(b)));
final HashMap<String, String> map = new HashMap<String, String>();
String line;
int pos;
while ((line = br.readLine()) != null) { // very slow readLine????
line = line.trim();
if (line.equals("# EOF")) return map;
if ((line.length() == 0) || (line.charAt(0) == '#')) continue;
pos = line.indexOf("=");
if (pos < 0) continue;
map.put(line.substring(0, pos), line.substring(pos + 1));
}
return map;
}
/**
* this does not write the content to the see position
* but to the very beginning of the record
* some additional bytes will ensure that we know the correct content size later on
*/
public void writeArray(final byte[] b) throws IOException {
seek(0);
writeInt(b.length);
write(b);
}
public byte[] readArray() throws IOException {
seek(0);
final int l = readInt();
final byte[] b = new byte[l];
read(b, 0, l);
return b;
}
}