git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@311 6c8d7289-2bf4-0310-a012-ef5d649a1542pull/1/head
orbiter
20 years ago
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// kelondroArray.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, 2005
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// last major change: 20.06.2005
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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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//
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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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/*
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This class extends the kelondroRecords and adds a array structure
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*/
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package de.anomic.kelondro;
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import java.io.BufferedReader;
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import java.io.File;
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import java.io.FileReader;
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import java.io.IOException;
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import java.io.RandomAccessFile;
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import java.util.Iterator;
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import java.util.StringTokenizer;
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public class kelondroArray extends kelondroRecords {
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// define the Over-Head-Array
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private static short thisOHBytes = 0; // our record definition does not need extra bytes
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private static short thisOHHandles = 0; // and two handles overhead for a double-chained list
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public kelondroArray(File file, int[] columns, int intprops) throws IOException {
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// this creates a new tree
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super(file, 0, thisOHBytes, thisOHHandles, columns, intprops, columns.length /*txtProps*/, 80 /*txtPropWidth*/);
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for (int i = 0; i < intprops; i++) setHandle(i, new Handle(0));
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}
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public kelondroArray(File file) throws IOException{
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// this opens a file with an existing array
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super(file, 0);
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}
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public synchronized byte[][] set(int index, byte[][] row) throws IOException {
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if (row.length != columns()) throw new IllegalArgumentException("set: wrong row length " + row.length + "; must be " + columns());
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// make room for element
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if (size() <= index) while (newNode() <= index) {}
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// get the node at position index
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Node n = getNode(new Handle(index));
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// write the row
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byte[][] before = n.setValues(row);
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return before;
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}
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public synchronized byte[][] get(int index) throws IOException {
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if (index >= size()) throw new kelondroException(filename, "out of bounds, index=" + index + ", size=" + size());
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return getNode(new Handle(index)).getValues();
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}
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public void print() throws IOException {
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System.out.println("PRINTOUT of table, length=" + size());
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byte[][] row;
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for (int i = 0; i < size(); i++) {
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System.out.print("row " + i + ": ");
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row = get(i);
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for (int j = 0; j < columns(); j++) System.out.print(new String(row[j]) + ", ");
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System.out.println();
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}
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System.out.println("EndOfTable");
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}
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private static void cmd(String[] args) {
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/*
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java -classpath classes de.anomic.kelondro.kelondroArray -c testarray.array 40
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java -classpath classes de.anomic.kelondro.kelondroArray -v testarray.array
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*/
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System.out.print("kelondroArray ");
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for (int i = 0; i < args.length; i++) System.out.print(args[i] + " ");
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System.out.println("");
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try {
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if ((args.length == 3) && (args[0].equals("-c"))) {
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// create <filename> <valuelen>
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File f = new File(args[1]);
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if (f.exists()) f.delete();
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int[] lens = new int[1];
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lens[0] = Integer.parseInt(args[2]);
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kelondroArray fm = new kelondroArray(f, lens, 2);
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fm.close();
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} else
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if ((args.length == 2) && (args[0].equals("-v"))) {
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// view <filename>
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kelondroArray fm = new kelondroArray(new File(args[1]));
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fm.print();
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fm.print(true);
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fm.close();
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} else
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if ((args.length == 3) && (args[0].equals("-g"))) {
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// get <filename> <index>
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kelondroArray fm = new kelondroArray(new File(args[1]));
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byte[][] row = fm.get(Integer.parseInt(args[2]));
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for (int j = 0; j < fm.columns(); j++) System.out.print(new String(row[j]) + " ");
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System.out.println();
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fm.close();
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} else
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if ((args.length == 4) && (args[0].equals("-s"))) {
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// set <filename> <index> <value>
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kelondroArray fm = new kelondroArray(new File(args[1]));
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byte[][] row = new byte[][]{args[3].getBytes()};
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fm.set(Integer.parseInt(args[2]), row);
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fm.close();
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} else {
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System.err.println("usage: kelondroArray -c|-v|-s|-g [file]|[index [value]] <db-file>");
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System.err.println("( create, view, set, get)");
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System.exit(0);
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}
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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public static void main(String[] args) {
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cmd(args);
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}
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}
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