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476 lines
18 KiB
476 lines
18 KiB
// kelondroRowCollection.java
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// (C) 2006 by Michael Peter Christen; mc@anomic.de, Frankfurt a. M., Germany
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// first published 12.01.2006 on http://www.anomic.de
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//
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// $LastChangedDate: 2006-04-02 22:40:07 +0200 (So, 02 Apr 2006) $
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// $LastChangedRevision: 1986 $
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// $LastChangedBy: orbiter $
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//
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// LICENSE
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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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package de.anomic.kelondro;
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import java.util.Iterator;
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import java.util.Set;
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public class kelondroRowCollection {
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protected byte[] chunkcache;
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protected int chunkcount;
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protected long lastTimeRead, lastTimeWrote;
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protected kelondroRow rowdef;
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protected int sortBound;
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protected kelondroOrder sortOrder;
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protected int sortColumn;
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private static final int exp_chunkcount = 0;
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private static final int exp_last_read = 1;
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private static final int exp_last_wrote = 2;
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private static final int exp_order_type = 3;
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private static final int exp_order_col = 4;
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private static final int exp_order_bound = 5;
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private static final int exp_collection = 6;
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public kelondroRowCollection(kelondroRow rowdef) {
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this(rowdef, 0);
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}
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public kelondroRowCollection(kelondroRowCollection rc) {
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this.rowdef = rc.rowdef;
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this.chunkcache = rc.chunkcache;
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this.chunkcount = rc.chunkcount;
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this.sortColumn = rc.sortColumn;
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this.sortOrder = rc.sortOrder;
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this.sortBound = rc.sortBound;
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this.lastTimeRead = rc.lastTimeRead;
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this.lastTimeWrote = rc.lastTimeWrote;
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}
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public kelondroRowCollection(kelondroRow rowdef, int objectCount) {
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this.rowdef = rowdef;
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this.chunkcache = new byte[objectCount * rowdef.objectsize()];
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this.chunkcount = 0;
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this.sortColumn = 0;
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this.sortOrder = null;
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this.sortBound = 0;
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this.lastTimeRead = System.currentTimeMillis();
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this.lastTimeWrote = System.currentTimeMillis();
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}
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public kelondroRowCollection(kelondroRow rowdef, int objectCount, byte[] cache, kelondroOrder sortOrder, int sortColumn, int sortBound) {
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this.rowdef = rowdef;
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this.chunkcache = cache;
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this.chunkcount = objectCount;
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this.sortColumn = sortColumn;
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this.sortOrder = sortOrder;
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this.sortBound = sortBound;
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this.lastTimeRead = System.currentTimeMillis();
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this.lastTimeWrote = System.currentTimeMillis();
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}
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public kelondroRowCollection(kelondroRow rowdef, byte[] exportedCollectionRowinstance) {
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this.rowdef = rowdef;
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kelondroRow.Entry exportedCollection = exportRow(exportedCollectionRowinstance.length - exportOverheadSize).newEntry(exportedCollectionRowinstance);
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this.chunkcount = (int) exportedCollection.getColLong(exp_chunkcount);
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this.lastTimeRead = (exportedCollection.getColLong(exp_last_read) + 10957) * day;
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this.lastTimeWrote = (exportedCollection.getColLong(exp_last_wrote) + 10957) * day;
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String sortOrderKey = exportedCollection.getColString(exp_order_type, null);
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if ((sortOrderKey == null) || (sortOrderKey.equals("__"))) {
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this.sortOrder = null;
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} else {
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this.sortOrder = kelondroNaturalOrder.bySignature(sortOrderKey);
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if (this.sortOrder == null) this.sortOrder = kelondroBase64Order.bySignature(sortOrderKey);
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}
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this.sortColumn = (int) exportedCollection.getColLong(exp_order_col);
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this.sortBound = (int) exportedCollection.getColLong(exp_order_bound);
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this.chunkcache = exportedCollection.getColBytes(exp_collection);
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}
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private static final long day = 1000 * 60 * 60 * 24;
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public static int daysSince2000(long time) {
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return (int) (time / day) - 10957;
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}
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private kelondroRow exportRow(int chunkcachelength) {
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// find out the size of this collection
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return new kelondroRow(
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"int size-4 {b256}," +
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"short lastread-2 {b256}," + // as daysSince2000
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"short lastwrote-2 {b256}," + // as daysSince2000
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"byte[] orderkey-2," +
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"short ordercol-2 {b256}," +
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"short orderbound-2 {b256}," +
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"byte[] collection-" + chunkcachelength
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);
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}
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public static final int exportOverheadSize = 14;
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public byte[] exportCollection() {
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// returns null if the collection is empty
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trim();
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kelondroRow row = exportRow(chunkcache.length);
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kelondroRow.Entry entry = row.newEntry();
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entry.setCol(exp_chunkcount, size());
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entry.setCol(exp_last_read, daysSince2000(this.lastTimeRead));
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entry.setCol(exp_last_wrote, daysSince2000(this.lastTimeWrote));
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entry.setCol(exp_order_type, (this.sortOrder == null) ? "__".getBytes() : this.sortOrder.signature().getBytes());
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entry.setCol(exp_order_col, this.sortColumn);
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entry.setCol(exp_order_bound, this.sortBound);
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entry.setCol(exp_collection, chunkcache);
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return entry.bytes();
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}
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public kelondroRow row() {
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return this.rowdef;
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}
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private final void ensureSize(int elements) {
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int needed = elements * rowdef.objectsize();
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if (chunkcache.length >= needed) return;
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byte[] newChunkcache = new byte[needed * 2];
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System.arraycopy(chunkcache, 0, newChunkcache, 0, chunkcache.length);
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chunkcache = newChunkcache;
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newChunkcache = null;
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}
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public void trim() {
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if (chunkcache.length == 0) return;
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synchronized (chunkcache) {
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int needed = chunkcount * rowdef.objectsize();
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if (chunkcache.length == needed) return;
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byte[] newChunkcache = new byte[needed];
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System.arraycopy(chunkcache, 0, newChunkcache, 0, newChunkcache.length);
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chunkcache = newChunkcache;
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newChunkcache = null;
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}
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}
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public void implantRows(byte[] b) {
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assert (b.length % rowdef.objectsize() == 0);
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synchronized (chunkcache) {
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chunkcache = b;
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chunkcount = b.length / rowdef.objectsize();
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sortBound = chunkcount;
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lastTimeWrote = System.currentTimeMillis();
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}
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}
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public final long lastRead() {
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return lastTimeRead;
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}
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public final long lastWrote() {
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return lastTimeWrote;
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}
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public final kelondroRow.Entry get(int index) {
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assert (index < chunkcount);
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byte[] a = new byte[rowdef.objectsize()];
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synchronized (chunkcache) {
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System.arraycopy(chunkcache, index * rowdef.objectsize(), a, 0, rowdef.objectsize());
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}
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this.lastTimeRead = System.currentTimeMillis();
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return rowdef.newEntry(a);
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}
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public final void set(int index, kelondroRow.Entry a) {
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set(index, a.bytes(), 0, a.bytes().length);
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}
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public final void set(int index, byte[] a, int astart, int alength) {
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assert (index < this.chunkcount);
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int l = Math.min(rowdef.objectsize(), Math.min(alength, a.length - astart));
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synchronized (chunkcache) {
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System.arraycopy(a, astart, chunkcache, index * rowdef.objectsize(), l);
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}
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this.lastTimeWrote = System.currentTimeMillis();
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}
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public void add(kelondroRow.Entry a) {
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add(a.bytes(), 0, a.bytes().length);
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}
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public void add(byte[] a) {
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add(a, 0, a.length);
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}
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private final void add(byte[] a, int astart, int alength) {
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int l = Math.min(rowdef.objectsize(), Math.min(alength, a.length - astart));
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synchronized (chunkcache) {
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ensureSize(chunkcount + 1);
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System.arraycopy(a, astart, chunkcache, rowdef.objectsize() * chunkcount, l);
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chunkcount++;
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}
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this.lastTimeWrote = System.currentTimeMillis();
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}
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public final void addAll(kelondroRowCollection c) {
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assert(rowdef.objectsize() >= c.rowdef.objectsize());
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synchronized(chunkcache) {
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ensureSize(chunkcount + c.size());
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}
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Iterator i = c.rows();
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kelondroRow.Entry entry;
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while (i.hasNext()) {
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entry = (kelondroRow.Entry) i.next();
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add(entry);
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}
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}
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protected final void removeShift(int pos, int dist, int upBound) {
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System.arraycopy(chunkcache, (pos + dist) * rowdef.objectsize(),
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chunkcache, pos * rowdef.objectsize(),
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(upBound - pos - dist) * rowdef.objectsize());
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if ((pos < sortBound) && (upBound >= sortBound)) sortBound -= dist;
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}
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public final void removeShift(int p) {
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assert ((p >= 0) && (p < chunkcount) && (chunkcount > 0));
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//System.out.println("REMOVE at pos " + p + ", chunkcount=" + chunkcount + ", sortBound=" + sortBound);
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synchronized (chunkcache) {
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removeShift(p, 1, chunkcount--);
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}
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this.lastTimeWrote = System.currentTimeMillis();
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}
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public void removeOne() {
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if (chunkcount == 0) return;
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if (chunkcount == sortBound) sortBound--;
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chunkcount--;
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this.lastTimeWrote = System.currentTimeMillis();
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}
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public void clear() {
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this.chunkcache = new byte[0];
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this.chunkcount = 0;
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this.sortBound = 0;
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this.lastTimeWrote = System.currentTimeMillis();
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}
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public int size() {
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return chunkcount;
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}
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public Iterator rows() {
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return new rowIterator();
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}
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public class rowIterator implements Iterator {
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private int p;
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public rowIterator() {
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p = 0;
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}
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public boolean hasNext() {
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return p < chunkcount;
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}
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public Object next() {
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return get(p++);
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}
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public void remove() {
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p--;
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System.arraycopy(chunkcache, (p + 1) * rowdef.objectsize(), chunkcache, p * rowdef.objectsize(), (chunkcount - p - 1) * rowdef.objectsize());
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chunkcount--;
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}
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}
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public void select(Set keys) {
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// removes all entries but the ones given by urlselection
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if ((keys == null) || (keys.size() == 0)) return;
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synchronized (this) {
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Iterator i = rows();
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kelondroRow.Entry row;
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while (i.hasNext()) {
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row = (kelondroRow.Entry) i.next();
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if (!(keys.contains(row.getColString(0, null)))) i.remove();
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}
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}
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}
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protected final void sort(kelondroOrder newOrder, int newColumn) {
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if ((this.sortOrder == null) ||
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(!(this.sortOrder.signature().equals(newOrder.signature()))) ||
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(newColumn != this.sortColumn)) {
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this.sortOrder = newOrder;
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this.sortBound = 0;
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this.sortColumn = newColumn;
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}
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sort();
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}
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protected final void sort() {
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assert (this.sortOrder != null);
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if (this.sortBound == this.chunkcount) return; // this is already sorted
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//System.out.println("SORT(chunkcount=" + this.chunkcount + ", sortBound=" + this.sortBound + ")");
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if (this.sortBound > 1) {
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qsort(0, this.sortBound, this.chunkcount);
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} else {
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qsort(0, this.chunkcount);
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}
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this.sortBound = this.chunkcount;
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}
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private final void qsort(int L, int S, int R) {
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//System.out.println("QSORT: chunkcache.length=" + chunkcache.length + ", chunksize=" + chunksize + ", L=" + L + ", S=" + S + ", R=" + R);
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assert (S <= R);
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if (L >= R - 1) return;
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if (S >= R) return;
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if (R - L < 20) {
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isort(L, R);
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return;
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}
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int p = L + ((S - L) / 2);
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int ps = p;
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int q = S;
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int qs = q;
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int pivot = p;
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while (q < R) {
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if (compare(pivot, q) < 1) {
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q++;
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} else {
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pivot = swap(p, q, pivot);
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p++;
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q++;
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}
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}
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if ((ps - L) <= ((p - L) / 2)) qsort(L, p); else qsort(L, ps, p);
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if ((qs - p) <= ((R - p) / 2)) qsort(p, R); else qsort(p, qs, R);
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}
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private final void qsort(int L, int R) {
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//System.out.println("QSORT: chunkcache.length=" + chunkcache.length + ", L=" + L + "/" + new String(this.chunkcache, L * this.rowdef.objectsize(), this.rowdef.width(0)) + ", R=" + R + "/" + new String(this.chunkcache, (R - 1) * this.rowdef.objectsize(), this.rowdef.width(0)));
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/*
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if ((L == 190) && (R == 258)) {
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for (int i = L; i < R; i++) {
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System.out.print(new String(this.chunkcache, L * this.chunksize, this.chunksize) + ", ");
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}
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System.out.println();
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}
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*/
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if (L >= R - 1) return;
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if (R - L < 20) {
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isort(L, R);
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return;
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}
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int i = L;
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int j = R - 1;
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int pivot = (i + j) / 2;
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//System.out.println("Pivot=" + pivot + "/" + new String(this.chunkcache, pivot * this.rowdef.objectsize(), this.rowdef.width(0)));
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while (i <= j) {
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while (compare(pivot, i) == 1) i++; // chunkAt[i] < keybuffer
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while (compare(pivot, j) == -1) j--; // chunkAt[j] > keybuffer
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//if (L == 6693) System.out.println(i + ", " + j);
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if (i <= j) {
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pivot = swap(i, j, pivot);
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i++;
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j--;
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}
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}
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//if (L == 6693) System.out.println(i);
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qsort(L, i);
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qsort(i, R);
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}
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private final void isort(int L, int R) {
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for (int i = L + 1; i < R; i++)
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for (int j = i; j > L && compare(j - 1, j) > 0; j--)
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swap(j, j - 1, 0);
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}
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protected final int swap(int i, int j, int p) {
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if (i == j) return p;
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if (this.chunkcount * this.rowdef.objectsize() < this.chunkcache.length) {
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// there is space in the chunkcache that we can use as buffer
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System.arraycopy(chunkcache, this.rowdef.objectsize() * i, chunkcache, chunkcache.length - this.rowdef.objectsize(), this.rowdef.objectsize());
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System.arraycopy(chunkcache, this.rowdef.objectsize() *j , chunkcache, this.rowdef.objectsize() * i, this.rowdef.objectsize());
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System.arraycopy(chunkcache, chunkcache.length - this.rowdef.objectsize(), chunkcache, this.rowdef.objectsize() * j, this.rowdef.objectsize());
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} else {
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// allocate a chunk to use as buffer
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byte[] a = new byte[this.rowdef.objectsize()];
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System.arraycopy(chunkcache, this.rowdef.objectsize() * i, a, 0, this.rowdef.objectsize());
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System.arraycopy(chunkcache, this.rowdef.objectsize() * j , chunkcache, this.rowdef.objectsize() * i, this.rowdef.objectsize());
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System.arraycopy(a, 0, chunkcache, this.rowdef.objectsize() * j, this.rowdef.objectsize());
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}
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if (i == p) return j; else if (j == p) return i; else return p;
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}
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public void uniq() {
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assert (this.sortOrder != null);
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// removes double-occurrences of chunks
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// this works only if the collection was ordered with sort before
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synchronized (chunkcache) {
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if (chunkcount <= 1) return;
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int i = 0;
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while (i < chunkcount - 1) {
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if (compare(i, i + 1) == 0) {
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//System.out.println("DOUBLE: " + new String(this.chunkcache, this.chunksize * i, this.chunksize));
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removeShift(i);
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} else {
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i++;
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}
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}
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}
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}
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public String toString() {
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StringBuffer s = new StringBuffer();
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Iterator i = rows();
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if (i.hasNext()) s.append(((kelondroRow.Entry) i.next()).toString());
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while (i.hasNext()) s.append(", " + ((kelondroRow.Entry) i.next()).toString());
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return new String(s);
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}
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private final int compare(int i, int j) {
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assert (i < chunkcount);
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assert (j < chunkcount);
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if (i == j) return 0;
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int keylength = this.rowdef.width(this.sortColumn);
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int colstart = this.rowdef.colstart[this.sortColumn];
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int c = this.sortOrder.compare(
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chunkcache,
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i * this.rowdef.objectsize() + colstart,
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keylength,
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chunkcache,
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j * this.rowdef.objectsize() + colstart,
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keylength);
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/*
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System.out.println("COMPARE(" +
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new String(this.chunkcache, i * this.rowdef.objectsize(), this.rowdef.width(0)) +
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", " +
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new String(this.chunkcache, j * this.rowdef.objectsize(), this.rowdef.width(0)) +
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")=" + c);
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*/
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return c;
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}
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public static void main(String[] args) {
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System.out.println(new java.util.Date(10957 * day));
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System.out.println(new java.util.Date(0));
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System.out.println(daysSince2000(System.currentTimeMillis()));
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}
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}
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