StringPool.java

/*
 *  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 com.github.ggrandes.kvstore.pool;

import com.github.ggrandes.kvstore.structures.hash.WeakSet;

/**
 * This class is Thread-Safe
 * 
 * @see java.util.WeakHashMap
 * @see java.lang.String#intern()
 * @author Guillermo Grandes / guillermo.grandes[at]gmail.com
 */
public class StringPool {
	private static final WeakSet<String> ws = new WeakSet<String>();

	public static final synchronized String getCanonicalVersion(final String str) {
		final String ref = ws.get(str);
		if (ref != null) {
			return ref;
		}
		ws.put(str);
		return str;
	}
	public static final synchronized int size() {
		return ws.size();
	}
	public static final synchronized void clear() {
		ws.clear();
	}
	public static final synchronized String get(final String str) {
		return ws.get(str);
	}
}