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introduction of generic order interface for kelondro

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this is needed for (to be introduced) splitted tree-files

git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@1283 6c8d7289-2bf4-0310-a012-ef5d649a1542
pull/1/head
orbiter 19 years ago
parent a4696fa92e
commit 7c0d7ed4f8
5 changed files with 234 additions and 47 deletions
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66
source/de/anomic/kelondro/kelondroAbstractOrder.java
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@ -0,0 +1,66 @@
// kelondroAbstractOrder.java
// -----------------------
// part of The Kelondro Database
// (C) by Michael Peter Christen; mc@anomic.de
// first published on http://www.anomic.de
// Frankfurt, Germany, 2005
// created 29.12.2005
//
// $LastChangedDate: 2005-09-22 22:01:26 +0200 (Thu, 22 Sep 2005) $
// $LastChangedRevision: 774 $
// $LastChangedBy: orbiter $
//
// 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 de.anomic.kelondro.kelondroRecords.Node;
public abstract class kelondroAbstractOrder implements kelondroOrder {
public long partition(byte[] key, int forks) {
final long d = (Long.MAX_VALUE / forks) + ((Long.MAX_VALUE % forks) + 1) / forks;
return cardinal(key) / d;
}
public int compare(Object a, Object b) {
if ((a instanceof byte[]) && (b instanceof byte[])) {
return compare((byte[]) a, (byte[]) b);
} else if ((a instanceof Node) && (b instanceof Node)) {
return compare(((Node) a).getKey(), ((Node) b).getKey());
} else
throw new IllegalArgumentException("Object type or Object type combination not supported");
}
}

3
source/de/anomic/kelondro/kelondroBinSearch.java
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@ -52,6 +52,7 @@ public class kelondroBinSearch {
private int chunksize;
private byte[] buffer;
private int count;
private kelondroOrder objectOrder = new kelondroNaturalOrder();
public kelondroBinSearch(byte[] chunks, int chunksize) {
this.chunks = chunks;
@ -71,7 +72,7 @@ public class kelondroBinSearch {
int pivot = (beginPos + endPos) / 2;
if ((pivot < 0) || (pivot >= this.count)) return false;
selectBuffer(pivot);
int c = kelondroTree.compare(buffer, t);
int c = objectOrder.compare(buffer, t);
if (c == 0) return true;
if (c < 0) /* buffer < t */ return contains(t, pivot + 1, endPos);
if (c > 0) /* buffer > t */ return contains(t, beginPos, pivot);

101
source/de/anomic/kelondro/kelondroNaturalOrder.java
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@ -0,0 +1,101 @@
// kelondroNaturalOrder.java
// -----------------------
// part of The Kelondro Database
// (C) by Michael Peter Christen; mc@anomic.de
// first published on http://www.anomic.de
// Frankfurt, Germany, 2005
// created 29.12.2005
//
// $LastChangedDate: 2005-09-22 22:01:26 +0200 (Thu, 22 Sep 2005) $
// $LastChangedRevision: 774 $
// $LastChangedBy: orbiter $
//
// 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.util.Comparator;
public class kelondroNaturalOrder extends kelondroAbstractOrder implements kelondroOrder, Comparator {
public kelondroNaturalOrder() {
}
public long cardinal(byte[] key) {
// returns a cardinal number in the range of 0 .. Long.MAX_VALUE
long c = 0;
int p = 0;
while ((p < 8) && (p < key.length)) c = (c << 8) | ((long) key[p++] & 0xFF);
while (p++ < 8) c = (c << 8);
c = c >>> 1;
return c;
}
// Compares its two arguments for order.
// Returns -1, 0, or 1 as the first argument
// is less than, equal to, or greater than the second.
// two arrays are also equal if one array is a subset of the other's array
// with filled-up char(0)-values
public int compare(byte[] a, byte[] b) {
int i = 0;
final int al = a.length;
final int bl = b.length;
final int len = (al > bl) ? bl : al;
while (i < len) {
if (a[i] > b[i])
return 1;
if (a[i] < b[i])
return -1;
// else the bytes are equal and it may go on yet undecided
i++;
}
// check if we have a zero-terminated equality
if ((i == al) && (i < bl) && (b[i] == 0)) return 0;
if ((i == bl) && (i < al) && (a[i] == 0)) return 0;
// no, decide by length
if (al > bl) return 1;
if (al < bl) return -1;
// no, they are equal
return 0;
}
public static void main(String[] args) {
byte[] t = new byte[12];
for (int i = 0; i < 12; i++) t[i] = (byte) 255;
t[0] = (byte) 127;
kelondroOrder o = new kelondroNaturalOrder();
System.out.println(o.partition(t, 16));
}
}

58
source/de/anomic/kelondro/kelondroOrder.java
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@ -0,0 +1,58 @@
// kelondroOrder.java
// -----------------------
// part of The Kelondro Database
// (C) by Michael Peter Christen; mc@anomic.de
// first published on http://www.anomic.de
// Frankfurt, Germany, 2005
// created 29.12.2005
//
// $LastChangedDate: 2005-09-22 22:01:26 +0200 (Thu, 22 Sep 2005) $
// $LastChangedRevision: 774 $
// $LastChangedBy: orbiter $
//
// 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.util.Comparator;
public interface kelondroOrder extends Comparator {
public long partition(byte[] key, int forkes);
public long cardinal(byte[] key); // returns a cardinal number in the range of 0 .. Long.MAX_VALUE
public int compare(byte[] a, byte[] b);
}

53
source/de/anomic/kelondro/kelondroTree.java
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@ -50,7 +50,6 @@ import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.util.Comparator;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
@ -58,7 +57,7 @@ import java.util.LinkedList;
import java.util.StringTokenizer;
import java.util.Vector;
public class kelondroTree extends kelondroRecords implements Comparator, kelondroIndex {
public class kelondroTree extends kelondroRecords implements kelondroIndex {
// define the Over-Head-Array
private static short thisOHBytes = 2; // our record definition of two bytes
@ -76,7 +75,7 @@ public class kelondroTree extends kelondroRecords implements Comparator, kelondr
private static int root = 0; // pointer for FHandles-array: pointer to root node
private Search writeSearchObj = new Search();
//private kelondroLock writeLock = new kelondroLock();
private kelondroOrder objectOrder = new kelondroNaturalOrder();
public kelondroTree(File file, long buffersize, int key, int value, boolean exitOnFail) {
this(file, buffersize, new int[] { key, value }, 1, 8, exitOnFail);
@ -261,7 +260,7 @@ public class kelondroTree extends kelondroRecords implements Comparator, kelondr
return;
}
//System.out.println("Comparing key = '" + new String(key) + "' with '" + otherkey + "':"); // debug
c = compare(key, thenode.getKey());
c = objectOrder.compare(key, thenode.getKey());
//System.out.println(c); // debug
if (c == 0) {
found = true;
@ -821,7 +820,7 @@ public class kelondroTree extends kelondroRecords implements Comparator, kelondr
ii = new nodeIterator(up, rotating, start);
nextNode = (ii.hasNext()) ? (Node) ii.next() : null;
if (nextNode != null) {
int c = compare(firstKey, nextNode.getKey());
int c = objectOrder.compare(firstKey, nextNode.getKey());
if ((c > 0) && (up)) {
// firstKey > nextNode.getKey()
logWarning("CORRECTING ITERATOR: firstKey=" + new String(firstKey) + ", nextNode=" + new String(nextNode.getKey()));
@ -884,7 +883,7 @@ public class kelondroTree extends kelondroRecords implements Comparator, kelondr
Node searchNode = getNode(searchHandle, null, 0);
byte[] startKey = start.getKey();
int c, ct;
while ((c = compare(startKey, searchNode.getKey())) != 0) {
while ((c = objectOrder.compare(startKey, searchNode.getKey())) != 0) {
// the current 'thisNode' is not the start node, put it on the stack
ct = (c < 0) ? leftchild : rightchild;
nodeStack.addLast(new Object[]{searchNode, new Integer(ct)});
@ -1293,46 +1292,8 @@ public class kelondroTree extends kelondroRecords implements Comparator, kelondr
}
}
public int compare(Object a, Object b) {
if ((a instanceof byte[]) && (b instanceof byte[])) {
return compare((byte[]) a, (byte[]) b);
} else if ((a instanceof Node) && (b instanceof Node)) {
return compare(((Node) a).getKey(), ((Node) b).getKey());
} else
throw new IllegalArgumentException("Object type or Object type combination not supported");
}
// Compares its two arguments for order.
// Returns -1, 0, or 1 as the first argument
// is less than, equal to, or greater than the second.
// two arrays are also equal if one array is a subset of the other's array with filled-up char(0)-values
public static int compare(byte[] a, byte[] b) {
int i = 0;
final int al = a.length;
final int bl = b.length;
final int len = (al > bl) ? bl : al;
while (i < len) {
if (a[i] > b[i]) return 1;
if (a[i] < b[i]) return -1;
// else the bytes are equal and it may go on yet undecided
i++;
}
// check if we have a zero-terminated equality
if ((i == al) && (i < bl) && (b[i] == 0)) return 0;
if ((i == bl) && (i < al) && (a[i] == 0)) return 0;
// no, decide by length
if (al > bl) return 1;
if (al < bl) return -1;
// no, they are equal
return 0;
}
// Returns the comparator used to order this map,
// or null if this map uses its keys' natural order.
public Comparator comparator() {
return this;
public kelondroOrder order() {
return this.objectOrder;
}
public static void main(String[] args) {

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