/*
 * Copyright (c) 2006 Stiftung Deutsches Elektronen-Synchroton,
 * 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.dal.impl;

import java.util.Hashtable;
import java.util.Properties;

import org.apache.log4j.Logger;
import org.csstudio.dal.context.AbstractApplicationContext;
import org.csstudio.dal.context.Identifier;
import org.csstudio.dal.context.LifecycleReporterSupport;
import org.csstudio.dal.spi.Plugs;


/**
 * Default application context implementation
 */
public class DefaultApplicationContext extends LifecycleReporterSupport
	implements AbstractApplicationContext
{
	private final String name;
	protected Properties configuration;
	protected Identifier identificator;
	private Logger logger;
	private Hashtable<String, Object> properties;

	/**
	 * Creates a new DefaultApplicationContext object.
	 *
	 * @param name application context name
	 */
	public DefaultApplicationContext(final String name)
	{
		super();
		this.name = name;
		fireInitializing();
		fireInitialized();
	}

	/*
	 *  (non-Javadoc)
	 * @see org.csstudio.dal.context.AbstractApplicationContext#getConfiguration()
	 */
	@Override
    public Properties getConfiguration(){
		if (configuration == null) {
			configuration = new Properties(System.getProperties());
			Plugs.configureSimulatorPlug(configuration);
		}
		return configuration;
	}

	/*
	 *  (non-Javadoc)
	 * @see org.csstudio.dal.context.Identifiable#getIdentifier()
	 */
	@Override
    public Identifier getIdentifier(){
		if (identificator == null)
			return null;
		return identificator;
		// TODO Check if this is OK
	}

	/*
	 *  (non-Javadoc)
	 * @see org.csstudio.dal.context.Identifiable#isDebug()
	 */
	@Override
    public boolean isDebug(){
		return false;
	}

	/*
	 *  (non-Javadoc)
	 * @see org.csstudio.dal.context.AbstractApplicationContext#getName()
	 */
	@Override
    public String getName()
	{
		return name;
	}

	/**
	 * Destroys context by signaling all listners that lifecycle has
	 * ended and  releases all resources. After this point context is not
	 * valid any more.
	 */
	@Override
    public void destroy()
	{
		fireDestroying();
		fireDestroyed();
	}

	/**
	 * Returns a logger registered to this application context. The name of the logger is
	 * the same as the name of application context.
	 * @return
	 */
	public Logger getLogger() {
		if (logger == null) {
			return Logger.getLogger(getClass());
		}
		return logger;
	}

	@Override
	public Object getApplicationProperty(final String keyName) {
		if (properties==null || keyName==null) {
			return null;
		}
		return properties.get(keyName);
	}

	@Override
	public synchronized void putApplicationProperty(final String keyName, final Object value) {
		if (keyName==null) {
			return;
		}
		if (properties==null) {
			properties= new Hashtable<String, Object>();
		}
		properties.put(keyName, value);
	}
}

/* __oOo__ */