/*
* #!
* Ontopia Engine
* #-
* Copyright (C) 2001 - 2013 The Ontopia Project
* #-
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* !#
*/
package net.ontopia.topicmaps.impl.utils;
import java.util.Map;
import java.util.HashMap;
import net.ontopia.infoset.core.LocatorIF;
/**
* INTERNAL: This class keeps an interning table of LocatorIF objects,
* allowing implementations to get rid of duplicate locators to save
* memory.
*/
public class LocatorInterningTable {
private static final Map<LocatorIF,LocatorIF> interningTable =
new HashMap<LocatorIF,LocatorIF>();
private LocatorInterningTable() {
}
public static synchronized LocatorIF intern(LocatorIF loc) {
LocatorIF interned = interningTable.get(loc);
if (interned == null) {
interned = loc;
interningTable.put(loc, loc);
}
return interned;
}
public synchronized void clear(){
interningTable.clear();
}
}