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/*
* 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.
*/
/*
* Contains code from GNU Trove having the license below.
*
* Copyright (c) 2001, Eric D. Friedman 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.THashMap;
import com.gemstone.gnu.trove.TObjectHashingStrategy;
/**
* Extends THashMap adding putIfAbsent method.
*
* @author swale
* @since 7.0
*/
public final class THashMapWithCreate extends THashMap {
private static final long serialVersionUID = 2440644010877735505L;
/**
* Factory to create value object for
* {@link THashMapWithCreate#create(Object, ValueCreator, Object)}.
*/
public static interface ValueCreator {
Object create(Object key, Object params);
}
/**
* Creates a new THashMapWithCreate instance with the default
* capacity and load factor.
*/
public THashMapWithCreate() {
super();
}
/**
* Creates a new THashMapWithCreate instance with a prime
* capacity equal to or greater than initialCapacity.
*
* @param initialCapacity
* an int value
*/
public THashMapWithCreate(int initialCapacity) {
super(initialCapacity);
}
/**
* Creates a new THashMapWithCreate instance with a prime
* capacity equal to or greater than initialCapacity and with the
* specified load factor.
*
* @param initialCapacity
* an int value
* @param loadFactor
* a float value
* @param strategy
* used to compute hash codes and to compare objects.
*/
public THashMapWithCreate(int initialCapacity, float loadFactor,
TObjectHashingStrategy strategy) {
super(initialCapacity, loadFactor, strategy);
}
/**
* Inserts a key/value pair into the map if the key does not already exist.
*
* @param key
* an Object value
* @param value
* an Object value
* @return the previous value associated with key, or null if none
* was found.
*/
public Object putIfAbsent(Object key, Object value) {
if (null != key) {
final Object oldKey;
final int index = insertionIndex(key);
if (index >= 0) {
oldKey = _set[index];
_set[index] = key;
_values[index] = value;
postInsertHook(oldKey == null);
return null;
}
else {
return _values[-index - 1];
}
}
else {
throw new NullPointerException("null keys not supported");
}
}
/**
* Inserts a key/value pair into the map if the key does not already exist
* creating the value using the provided factory only in that case.
*
* @param key
* an Object value
* @param valueCreator
* an {@link ValueCreator} instance
* @param params
* any parameters to be passed to {@link ValueCreator#create} method
*
* @return the previous value associated with key, or null
*/
public Object putIfAbsent(final Object key, final ValueCreator valueCreator,
final Object params) {
if (key != null) {
final Object oldKey, value;
final int index = insertionIndex(key);
if (index >= 0) {
oldKey = _set[index];
_set[index] = key;
value = valueCreator.create(key, params);
_values[index] = value;
postInsertHook(oldKey == null);
return null;
}
else {
return _values[-index - 1];
}
}
else {
throw new NullPointerException("null keys not supported");
}
}
/**
* Inserts a key/value pair into the map if the key does not already exist
* creating the value using the provided factory only in that case.
*
* @param key
* an Object value
* @param valueCreator
* an {@link ValueCreator} instance
* @param params
* any parameters to be passed to {@link ValueCreator#create} method
*
* @return the previous value associated with key, or the newly
* created one
*/
public Object create(Object key, ValueCreator valueCreator, Object params) {
if (null != key) {
final Object oldKey, value;
final int index = insertionIndex(key);
if (index >= 0) {
oldKey = _set[index];
_set[index] = key;
value = valueCreator.create(key, params);
_values[index] = value;
postInsertHook(oldKey == null);
return value;
}
else {
return _values[-index - 1];
}
}
else {
throw new NullPointerException("null keys not supported");
}
}
}
