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234 lines
8.0 KiB
234 lines
8.0 KiB
// kelondroAbstractRA.java
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// -----------------------
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// part of The Kelondro Database
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// (C) by Michael Peter Christen; mc@anomic.de
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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: 09.02.2004
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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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//
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// Using this software in any meaning (reading, learning, copying, compiling,
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// running) means that you agree that the Author(s) is (are) not responsible
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// for cost, loss of data or any harm that may be caused directly or indirectly
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// by usage of this softare or this documentation. The usage of this software
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// is on your own risk. The installation and usage (starting/running) of this
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// software may allow other people or application to access your computer and
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// any attached devices and is highly dependent on the configuration of the
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// software which must be done by the user of the software; the author(s) is
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// (are) also not responsible for proper configuration and usage of the
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// software, even if provoked by documentation provided together with
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// the software.
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//
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// Any changes to this file according to the GPL as documented in the file
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// gpl.txt aside this file in the shipment you received can be done to the
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// lines that follows this copyright notice here, but changes must not be
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// done inside the copyright notive above. A re-distribution must contain
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// the intact and unchanged copyright notice.
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// Contributions and changes to the program code must be marked as such.
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package de.anomic.kelondro;
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import java.io.IOException;
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import java.util.Enumeration;
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import java.util.Iterator;
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import java.util.Map;
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import java.util.Properties;
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import java.util.TreeMap;
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abstract class kelondroAbstractRA implements kelondroRA {
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// logging support
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protected String name = null;
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public String name() {
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return name;
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}
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// pseudo-native methods:
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abstract public int read() throws IOException;
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abstract public void write(int b) throws IOException;
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abstract public int read(byte[] b, int off, int len) throws IOException;
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abstract public void write(byte[] b, int off, int len) throws IOException;
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abstract public void seek(long pos) throws IOException;
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abstract public void close() throws IOException;
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// derivated methods:
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public byte readByte() throws IOException {
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int ch = this.read();
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if (ch < 0) throw new IOException();
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return (byte)(ch);
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}
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public void writeByte(int v) throws IOException {
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this.write(v);
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}
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public short readShort() throws IOException {
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int ch1 = this.read();
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int ch2 = this.read();
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if ((ch1 | ch2) < 0) throw new IOException();
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return (short) ((ch1 << 8) + (ch2 << 0));
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}
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public void writeShort(int v) throws IOException {
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this.write((v >>> 8) & 0xFF); this.write((v >>> 0) & 0xFF);
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}
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public int readInt() throws IOException {
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int ch1 = this.read();
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int ch2 = this.read();
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int ch3 = this.read();
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int ch4 = this.read();
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if ((ch1 | ch2 | ch3 | ch4) < 0) throw new IOException("kelondroAbstractRA.readInt: wrong values; ch1=" + ch1 + ", ch2=" + ch2 + ", ch3=" + ch3 + ", ch4=" + ch4);
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return ((ch1 << 24) | (ch2 << 16) | (ch3 << 8) | ch4);
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}
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public void writeInt(int v) throws IOException {
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this.write((v >>> 24) & 0xFF); this.write((v >>> 16) & 0xFF);
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this.write((v >>> 8) & 0xFF); this.write((v >>> 0) & 0xFF);
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}
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public long readLong() throws IOException {
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return ((long) (readInt()) << 32) + (readInt() & 0xFFFFFFFFL);
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}
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public void writeLong(long v) throws IOException {
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this.write((int) (v >>> 56) & 0xFF); this.write((int) (v >>> 48) & 0xFF);
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this.write((int) (v >>> 40) & 0xFF); this.write((int) (v >>> 32) & 0xFF);
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this.write((int) (v >>> 24) & 0xFF); this.write((int) (v >>> 16) & 0xFF);
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this.write((int) (v >>> 8) & 0xFF); this.write((int) (v >>> 0) & 0xFF);
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}
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public void write(byte[] b) throws IOException {
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this.write(b, 0, b.length);
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}
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private static final byte cr = 13;
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private static final byte lf = 10;
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private static final String crlf = new String(new byte[] {cr, lf});
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public void writeLine(String line) throws IOException {
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this.write(line.getBytes());
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this.write(cr);
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this.write(lf);
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}
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public String readLine() throws IOException {
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// with these functions, we consider a line as always terminated by CRLF
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byte[] bb = new byte[80];
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int bbsize = 0;
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int c;
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while (true) {
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c = read();
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if (c < 0) {
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if (bbsize == 0) return null; else return new String(bb, 0, bbsize);
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}
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if (c == cr) continue;
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if (c == lf) return new String(bb, 0, bbsize);
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// append to bb
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if (bbsize == bb.length) {
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// extend bb size
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byte[] newbb = new byte[bb.length * 2];
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System.arraycopy(bb, 0, newbb, 0, bb.length);
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bb = newbb;
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newbb = null;
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}
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bb[bbsize++] = (byte) c;
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}
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}
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public void writeProperties(Properties props, String comment) throws IOException {
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this.seek(0);
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writeLine("# " + comment);
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Enumeration e = props.propertyNames();
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String key, value;
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while (e.hasMoreElements()) {
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key = (String) e.nextElement();
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value = props.getProperty(key, "");
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write(key.getBytes());
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write((byte) '=');
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writeLine(value);
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}
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writeLine("# EOF");
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}
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public Properties readProperties() throws IOException {
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this.seek(0);
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Properties props = new Properties();
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String line;
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int pos;
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while ((line = readLine()) != null) {
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line = line.trim();
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if (line.equals("# EOF")) return props;
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if ((line.length() == 0) || (line.charAt(0) == '#')) continue;
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pos = line.indexOf("=");
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if (pos < 0) continue;
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props.setProperty(line.substring(0, pos).trim(), line.substring(pos + 1).trim());
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}
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return props;
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}
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public void writeMap(Map map, String comment) throws IOException {
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this.seek(0);
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writeLine("# " + comment);
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Iterator i = map.entrySet().iterator();
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Map.Entry entry;
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while (i.hasNext()) {
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entry = (Map.Entry) i.next();
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write(((String) entry.getKey()).getBytes());
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write((byte) '=');
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writeLine((String) entry.getValue());
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}
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writeLine("# EOF");
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}
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public Map readMap() throws IOException {
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this.seek(0);
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TreeMap map = new TreeMap();
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String line;
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int pos;
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while ((line = readLine()) != null) { // very slow readLine????
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line = line.trim();
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if (line.equals("# EOF")) return map;
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if ((line.length() == 0) || (line.charAt(0) == '#')) continue;
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pos = line.indexOf("=");
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if (pos < 0) continue;
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map.put(line.substring(0, pos), line.substring(pos + 1));
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}
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return map;
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}
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public void writeArray(byte[] b) throws IOException {
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// this does not write the content to the see position
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// but to the very beginning of the record
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// some additional bytes will ensure that we know the correct content size later on
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seek(0);
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writeInt(b.length);
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write(b);
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}
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public byte[] readArray() throws IOException {
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seek(0);
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int l = readInt();
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byte[] b = new byte[l];
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read(b, 0, l);
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return b;
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}
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}
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