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/**
 *  MicroEmulator
 *  Copyright (C) 2006-2007 Bartek Teodorczyk 
 *  Copyright (C) 2006-2007 Vlad Skarzhevskyy
 *
 *  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
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *  @version $Id: ThreadUtils.java 1354 2007-09-28 15:35:10Z vlads $
 */
package org.microemu.util;

import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.util.Timer;

public class ThreadUtils {

	private static boolean java13 = false;
	
	private static boolean java14 = false;
	
	/**
     * Creates a new timer whose associated thread has the specified name in Java 1.5.
	 * 
	 * @param name the name of the associated thread
     *
	 */
	public static Timer createTimer(String name) {
		try {
			Constructor c = Timer.class.getConstructor(new Class[] { String.class });
			return (Timer)c.newInstance(new Object[]{name});
		} catch (Throwable e) {
			// In cany case create new Timer
			return new Timer();
		}
	}

	public static String getCallLocation(String fqn) {
		if (!java13) {
			try {
				StackTraceElement[] ste = new Throwable().getStackTrace();
				for (int i = 0; i < ste.length - 1; i++) {
					if (fqn.equals(ste[i].getClassName())) {
						StackTraceElement callLocation = ste[i + 1];
						String nextClassName = callLocation.getClassName();
						if (nextClassName.equals(fqn)) {
							continue;
						}
						return callLocation.toString();
					}
				}
			} catch (Throwable e) {
				java13 = true;
			}
		}
		return null;
	}
	
	public static String getTreadStackTrace(Thread t) {
		if (java14) {
			return "";
		}
		try {
			// Java 1.5 thread.getStackTrace();
			Method m = t.getClass().getMethod("getStackTrace", null);
			
			StackTraceElement[] trace = (StackTraceElement[])m.invoke(t, null);
			StringBuffer b = new StringBuffer();  
			for (int i=0; i < trace.length; i++) {
			    b.append("\n\tat ").append(trace[i]);
			}
			return b.toString();
		} catch (Throwable e) {
			java14 = true;
			return "";
		}
	}
}