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git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@2212 6c8d7289-2bf4-0310-a012-ef5d649a1542
83 lines
2.9 KiB
Java
83 lines
2.9 KiB
Java
// kelondroCollectionObjectMap.java
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// (C) 2006 by Michael Peter Christen; mc@anomic.de, Frankfurt a. M., Germany
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// first published 18.06.2006 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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public class kelondroCollectionObjectMap extends kelondroCollection {
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// use this only, if key objects can ensure perfect hashing!
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// (that means, the hash computation must be unique)
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// this is given for kelondroRecords.Entry objects
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private kelondroRow indexrow;
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public kelondroCollectionObjectMap(int payloadSize, int objectCount) {
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super(4 + payloadSize, objectCount);
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// initialize row
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this.indexrow = new kelondroRow(new int[]{4, payloadSize});
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}
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public byte[] get(Object key) {
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kelondroRow.Entry indexentry = indexrow.newEntry(super.get(objKey2byteKey(key)));
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if (indexentry == null) return null;
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return indexentry.getColBytes(1);
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}
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public byte[] put(Object obj, byte[] value) {
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int index = -1;
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byte[] key = objKey2byteKey(obj);
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//System.out.println("ObjectMap PUT " + obj.hashCode() + ", size=" + size());
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synchronized (chunkcache) {
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index = find(key, 4);
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}
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if (index < 0) {
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kelondroRow.Entry indexentry = indexrow.newEntry();
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indexentry.setCol(0, key);
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indexentry.setCol(1, value);
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add(indexentry.bytes());
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return null;
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} else {
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kelondroRow.Entry indexentry = indexrow.newEntry(get(index));
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byte[] old = indexentry.getColBytes(1);
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indexentry.setCol(1, value);
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set(index, indexentry.bytes());
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return old;
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}
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}
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public byte[] remove(Object key) {
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kelondroRow.Entry indexentry = indexrow.newEntry(super.remove(objKey2byteKey(key)));
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if (indexentry == null) return null;
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return indexentry.getColBytes(1);
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}
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private byte[] objKey2byteKey(Object obj) {
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int i = obj.hashCode();
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byte[] b = kelondroNaturalOrder.encodeLong((long) i, 4);
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return b;
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}
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}
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