EProperties.java

/*******************************************************************************
 * Copyright (c) 2003-2005, 2013 Till Zoppke.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Public License v3.0
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/gpl.html
 * 
 * Contributors:
 *     Till Zoppke - initial API and implementation
 ******************************************************************************/
package eniac.util;

import java.util.Properties;

import eniac.Manager;

public class EProperties extends Properties {

	/**
	 * Properties file to be loaded from the class path
	 */
	public static final String fileName = "eniac.properties";

	/*
	 * ========================= singleton stuff ===============================
	 */

	// singleton self reference
	private static EProperties instance;

	// singleton private constructor
	private EProperties() {

		// load properties
		try {
			load(Manager.class.getClassLoader().getResourceAsStream(fileName));
		} catch (Exception e) {
			System.out.println("Error: Cannot load properties file.");
		}
	}

	public String getProperty(Status status) {
		return super.getProperty(status.toString());
	}

	// note: this method has to be synchronized, because during loading a skin
	// or scanning for proxies there are separate threads started.
	// So we have to make sure, that the new StatusMap object is created AND
	// it is initialized, befor another thread can enter this method and
	// can find a non-null reference.
	public synchronized static EProperties getInstance() {
		if (instance == null) {
			instance = new EProperties();
		}
		return instance;
	}
}