com.gemstone.gemfire.internal.cache.TStatelessPrimitiveHash Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of gemfire-trove Show documentation
Show all versions of gemfire-trove Show documentation
SnappyData store based off Pivotal GemFireXD
The newest version!
/*
* Copyright (c) 2010-2015 Pivotal Software, Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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 Lesser 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 com.gemstone.gemfire.internal.cache;
import com.gemstone.gnu.trove.*;
/**
* The base class for hashtables of primitive values.
* Each subclass is responsible to reserve a primitive value for
* indicating that a slot is FREE.
* This saves memory compared to TPrimitiveHash that has a byte[].
* We also lose the distinction of FREE vs REMOVED so remove is not allowed
* on stateless collections.
* If needed remove support can be added by adding another reserved primitive
* value to indicate a REMOVE.
*
* @author darrel
*/
abstract public class TStatelessPrimitiveHash extends THash {
/**
* Creates a new THash instance with the default
* capacity and load factor.
*/
public TStatelessPrimitiveHash() {
super();
}
/**
* Creates a new TStatelessPrimitiveHash instance with a prime
* capacity at or near the specified capacity and with the default
* load factor.
*
* @param initialCapacity an int value
*/
public TStatelessPrimitiveHash(int initialCapacity) {
this(initialCapacity, DEFAULT_LOAD_FACTOR);
}
@Override
protected void removeAt(int index) {
throw new IllegalStateException("remove not allowed on stateless classes");
}
/**
* Creates a new TStatelessPrimitiveHash instance with a prime
* capacity at or near the minimum needed to hold
* initialCapacity elements with load factor
* loadFactor without triggering a rehash.
*
* @param initialCapacity an int value
* @param loadFactor a float value
*/
public TStatelessPrimitiveHash(int initialCapacity, float loadFactor) {
super();
_loadFactor = loadFactor;
setUp((int)Math.ceil(initialCapacity / loadFactor));
}
@Override
public Object clone() {
TStatelessPrimitiveHash h = (TStatelessPrimitiveHash)super.clone();
return h;
}
} // TStatelessPrimitiveHash