You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
83 lines
2.9 KiB
83 lines
2.9 KiB
// kelondroCollectionObjectMap.java
|
|
// (C) 2006 by Michael Peter Christen; mc@anomic.de, Frankfurt a. M., Germany
|
|
// first published 18.06.2006 on http://www.anomic.de
|
|
//
|
|
// $LastChangedDate: 2006-04-02 22:40:07 +0200 (So, 02 Apr 2006) $
|
|
// $LastChangedRevision: 1986 $
|
|
// $LastChangedBy: orbiter $
|
|
//
|
|
// LICENSE
|
|
//
|
|
// 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
|
|
|
|
package de.anomic.kelondro;
|
|
|
|
public class kelondroCollectionObjectMap extends kelondroCollection {
|
|
|
|
// use this only, if key objects can ensure perfect hashing!
|
|
// (that means, the hash computation must be unique)
|
|
// this is given for kelondroRecords.Entry objects
|
|
|
|
private kelondroRow indexrow;
|
|
|
|
public kelondroCollectionObjectMap(int payloadSize, int objectCount) {
|
|
super(4 + payloadSize, objectCount);
|
|
|
|
// initialize row
|
|
this.indexrow = new kelondroRow(new int[]{4, payloadSize});
|
|
}
|
|
|
|
public byte[] get(Object key) {
|
|
kelondroRow.Entry indexentry = indexrow.newEntry(super.get(objKey2byteKey(key)));
|
|
if (indexentry == null) return null;
|
|
return indexentry.getColBytes(1);
|
|
}
|
|
|
|
public byte[] put(Object obj, byte[] value) {
|
|
int index = -1;
|
|
byte[] key = objKey2byteKey(obj);
|
|
//System.out.println("ObjectMap PUT " + obj.hashCode() + ", size=" + size());
|
|
synchronized (chunkcache) {
|
|
index = find(key, 4);
|
|
}
|
|
if (index < 0) {
|
|
kelondroRow.Entry indexentry = indexrow.newEntry();
|
|
indexentry.setCol(0, key);
|
|
indexentry.setCol(1, value);
|
|
add(indexentry.bytes());
|
|
return null;
|
|
} else {
|
|
kelondroRow.Entry indexentry = indexrow.newEntry(get(index));
|
|
byte[] old = indexentry.getColBytes(1);
|
|
indexentry.setCol(1, value);
|
|
set(index, indexentry.bytes());
|
|
return old;
|
|
}
|
|
}
|
|
|
|
public byte[] remove(Object key) {
|
|
kelondroRow.Entry indexentry = indexrow.newEntry(super.remove(objKey2byteKey(key)));
|
|
if (indexentry == null) return null;
|
|
return indexentry.getColBytes(1);
|
|
}
|
|
|
|
private byte[] objKey2byteKey(Object obj) {
|
|
int i = obj.hashCode();
|
|
byte[] b = kelondroNaturalOrder.encodeLong((long) i, 4);
|
|
return b;
|
|
}
|
|
|
|
}
|