/* 
 * Copyright (c) 2008 Stiftung Deutsches Elektronen-Synchrotron, 
 * Member of the Helmholtz Association, (DESY), HAMBURG, GERMANY.
 *
 * THIS SOFTWARE IS PROVIDED UNDER THIS LICENSE ON AN "../AS IS" BASIS. 
 * WITHOUT WARRANTY OF ANY KIND, EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED 
 * TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR PARTICULAR PURPOSE AND 
 * NON-INFRINGEMENT. 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. SHOULD THE SOFTWARE PROVE DEFECTIVE 
 * IN ANY RESPECT, THE USER ASSUMES THE COST OF ANY NECESSARY SERVICING, REPAIR OR 
 * CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS LICENSE. 
 * NO USE OF ANY SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER THIS DISCLAIMER.
 * DESY HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, 
 * OR MODIFICATIONS.
 * THE FULL LICENSE SPECIFYING FOR THE SOFTWARE THE REDISTRIBUTION, MODIFICATION, 
 * USAGE AND OTHER RIGHTS AND OBLIGATIONS IS INCLUDED WITH THE DISTRIBUTION OF THIS 
 * PROJECT IN THE FILE LICENSE.HTML. IF THE LICENSE IS NOT INCLUDED YOU MAY FIND A COPY 
 * AT HTTP://WWW.DESY.DE/LEGAL/LICENSE.HTM
 */
 package org.csstudio.sds.internal.persistence;

import java.io.InputStream;

import org.csstudio.sds.model.DisplayModel;

/**
 * Thread that loads display models concurrently.
 * 
 * @author Alexander Will
 * @version $Revision: 1.1 $
 * 
 */
public final class ConcurrentModelLoader extends Thread {

	/**
	 * The display model that is to be filled with the loaded data.
	 */
	private DisplayModel _displayModel;

	/**
	 * The source file resource.
	 */
	private InputStream _inputStream;

	/**
	 * Optional listener that will be notified of model loading events.
	 */
	private IDisplayModelLoadListener _loadListener;

	/**
	 * Standard constructor.
	 * 
	 * @param displayModel
	 *            The display model that is to be filled with the loaded data.
	 * @param inputStream
	 *            The source file resource.
	 * @param loaderCallback
	 *            Optional listener that will be notified of model loading
	 *            events (can be null).
	 */
	public ConcurrentModelLoader(final DisplayModel displayModel,
			final InputStream inputStream,
			final IDisplayModelLoadListener loadListener) {
		assert displayModel != null;
		assert inputStream != null;

		_displayModel = displayModel;
		_inputStream = inputStream;
		_loadListener = loadListener;
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public void run() {
		_displayModel.setLoading(true);

		DisplayModelReader reader = new DisplayModelReader();
		reader.readModelFromXml(_inputStream,
				_displayModel, _loadListener);

		if (reader.isErrorOccurred()) {
			if (_loadListener != null) {
				_loadListener.onErrorsOccured(reader
						.getErrorMessages());
			}
		}

		if (_loadListener != null) {
			_loadListener.onDisplayModelLoaded();
		}
		
		_displayModel.setLoading(false);
	}
}