OpenNIContextSingleton.java

/**
 * Copyright (C) 2013 Colorado School of Mines
 *
 * This file is part of the Interface Software Development Kit (SDK).
 *
 * The InterfaceSDK is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * The InterfaceSDK 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with the InterfaceSDK.  If not, see <http://www.gnu.org/licenses/>.
 */
package edu.mines.acmX.exhibit.input_services.hardware.drivers.openni;

import org.OpenNI.Context;
import org.OpenNI.GeneralException;
import org.OpenNI.OutArg;
import org.OpenNI.ScriptNode;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

/**
 * A singleton for the OpenNI Context that manages communication between
 * the openni library and the kinect device.
 * 
 * @author Aakash Shah
 * @author Ryan Stauffer
 */
public class OpenNIContextSingleton {
	public static final Logger log = LogManager.getLogger(OpenNIContextSingleton.class);
    private static Context context = null;
    private static OutArg<ScriptNode> scriptNode;
    private static String xml_file = null;

    public static void setConfigurationFile(String str) {
    	xml_file = str;
    }
    
    public static Context getContext()
    		throws GeneralException, OpenNIConfigurationException {
    	if (xml_file == null) {
    		throw new OpenNIConfigurationException("No configuration file provided!");
    	}
    	
    	if (context == null) {
    		scriptNode = new OutArg<ScriptNode>();
    		context = Context.createFromXmlFile(xml_file, scriptNode);
    	}
        return context;
    }
    
    public static void destroy() {
	    context.release();
    	context = null;
    }
}