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235 lines
8.9 KiB
235 lines
8.9 KiB
// kelondroSplittedTree.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, 2006
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// created 07.01.2006
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//
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// $LastChangedDate: 2005-09-22 22:01:26 +0200 (Thu, 22 Sep 2005) $
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// $LastChangedRevision: 774 $
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// $LastChangedBy: orbiter $
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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.File;
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import java.io.IOException;
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import java.util.Iterator;
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public class kelondroSplittedTree implements kelondroIndex {
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private kelondroTree[] ktfs;
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private kelondroOrder order;
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private int ff;
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private static File dbFile(File path, String filenameStub, int forkfactor, int columns, int number) {
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String ns = Integer.toHexString(number).toUpperCase();
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while (ns.length() < 2) ns = "0" + ns;
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String ff = Integer.toHexString(forkfactor).toUpperCase();
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while (ff.length() < 2) ff = "0" + ff;
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String co = Integer.toHexString(columns).toUpperCase();
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while (co.length() < 2) co = "0" + co;
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return new File(path, filenameStub + "." + ff + "." + co + "." + ns + ".ktc");
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}
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private static boolean existsAll(File pathToFiles, String filenameStub, int forkfactor, int columns){
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for (int i = 0; i < forkfactor; i++) {
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if (!(dbFile(pathToFiles, filenameStub, forkfactor, columns, i)).exists()) return false;
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}
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return true;
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}
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public kelondroSplittedTree(File pathToFiles, String filenameStub, kelondroOrder objectOrder,
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long buffersize,
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int forkfactor,
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int[] columns,
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int txtProps, int txtPropsWidth,
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boolean exitOnFail) {
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ktfs = new kelondroTree[forkfactor];
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File f;
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for (int i = 0; i < forkfactor; i++) {
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f = dbFile(pathToFiles, filenameStub, forkfactor, columns.length, i);
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if (f.exists()) {
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try {
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ktfs[i] = new kelondroTree(f, buffersize/forkfactor);
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this.order = ktfs[i].order();
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} catch (IOException e) {
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ktfs[i] = new kelondroTree(f, buffersize/forkfactor,
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columns, objectOrder, txtProps, txtPropsWidth, exitOnFail);
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this.order = objectOrder;
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}
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} else {
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ktfs[i] = new kelondroTree(f, buffersize/forkfactor,
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columns, objectOrder, txtProps, txtPropsWidth, exitOnFail);
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this.order = objectOrder;
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}
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}
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ff = forkfactor;
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}
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public kelondroSplittedTree(File pathToFiles, String filenameStub, kelondroOrder objectOrder,
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long buffersize, int forkfactor, int columns) throws IOException {
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ktfs = new kelondroTree[forkfactor];
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for (int i = 0; i < forkfactor; i++) {
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ktfs[i] = new kelondroTree(dbFile(pathToFiles, filenameStub, forkfactor, columns, i), buffersize/forkfactor);
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}
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ff = forkfactor;
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this.order = objectOrder;
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}
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public static kelondroSplittedTree open(File pathToFiles, String filenameStub, kelondroOrder objectOrder,
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long buffersize,
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int forkfactor,
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int[] columns, int txtProps, int txtPropsWidth,
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boolean exitOnFail) throws IOException {
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// generated a new splittet tree if it not exists or
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// opens an existing one
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if (existsAll(pathToFiles, filenameStub, forkfactor, columns.length)) {
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return new kelondroSplittedTree(pathToFiles, filenameStub, objectOrder, buffersize, forkfactor, columns.length);
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} else {
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return new kelondroSplittedTree(pathToFiles, filenameStub, objectOrder,
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buffersize,
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forkfactor,
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columns, txtProps, txtPropsWidth,
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exitOnFail);
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}
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}
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public int columns() {
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return ktfs[0].columns();
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}
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public int columnSize(int column) {
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return ktfs[0].columnSize(column);
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}
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private int partition(byte[] key) {
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// return number of db file where this key should be managed
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return (int) order.partition(key, ff);
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}
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public byte[][] get(byte[] key) throws IOException {
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return ktfs[partition(key)].get(key);
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}
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public byte[][] put(byte[][] row) throws IOException {
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return ktfs[partition(row[0])].put(row);
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}
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public byte[][] remove(byte[] key) throws IOException {
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return ktfs[partition(key)].remove(key);
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}
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public Iterator rows(boolean up, boolean rotating) throws IOException {
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return new ktfsIterator(up, rotating);
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}
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public class ktfsIterator implements Iterator {
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int c = 0;
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Iterator ktfsI;
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boolean up, rot;
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public ktfsIterator(boolean up, boolean rotating) throws IOException {
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this.up = up;
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this.rot = rotating;
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c = (up) ? 0 : (ff - 1);
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ktfsI = ktfs[c].rows(up, false, null);
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}
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public boolean hasNext() {
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return ((rot) ||
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(ktfsI.hasNext()) ||
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((up) && (c < ff)) ||
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((!(up)) && (c > 0)));
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}
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public Object next() {
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if (ktfsI.hasNext()) return ktfsI.next();
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if (up) {
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if (c < (ff - 1)) {
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c++;
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try {
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ktfsI = ktfs[c].rows(true, false, null);
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} catch (IOException e) {
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return null;
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}
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return ktfsI.next();
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} else {
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if (rot) {
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c = 0;
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try {
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ktfsI = ktfs[c].rows(true, false, null);
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} catch (IOException e) {
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return null;
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}
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return ktfsI.next();
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}
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return null;
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}
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} else {
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if (c > 0) {
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c--;
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try {
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ktfsI = ktfs[c].rows(false, false, null);
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} catch (IOException e) {
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return null;
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}
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return ktfsI.next();
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} else {
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if (rot) {
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c = ff - 1;
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try {
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ktfsI = ktfs[c].rows(false, false, null);
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} catch (IOException e) {
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return null;
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}
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return ktfsI.next();
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}
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return null;
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}
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}
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}
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public void remove() {
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ktfsI.remove();
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}
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}
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}
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