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/**
 * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package com.liferay.portal.kernel.util;

import com.liferay.portal.kernel.log.Log;
import com.liferay.portal.kernel.log.LogFactoryUtil;

import java.lang.Cloneable;
import java.lang.reflect.Method;

/**
 * View Source
 *
 * @author Brian Wing Shun Chan
 *
 */
public class InitialThreadLocal extends ThreadLocal {

	public InitialThreadLocal(T initialValue) {
		_initialValue = initialValue;
	}

	protected T initialValue() {
		if (_initialValue instanceof Cloneable) {
			try {
				Method method = _initialValue.getClass().getMethod(
					_METHOD_CLONE);

				return (T)method.invoke(_initialValue);
			}
			catch (Exception e) {
				_log.error(e, e);
			}
		}

		return _initialValue;
	}

	private static final String _METHOD_CLONE = "clone";

	private static Log _log = LogFactoryUtil.getLog(InitialThreadLocal.class);

	private T _initialValue;

}