/*******************************************************************************
 * Copyright (c) 2003, 2005 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - Initial API and implementation
 *******************************************************************************/
package org.eclipse.wst.internet.monitor.ui.internal;

import org.eclipse.jface.viewers.ILabelProviderListener;

import org.eclipse.swt.graphics.Image;
import org.eclipse.wst.internet.monitor.core.IMonitor;
import org.eclipse.jface.viewers.ITableLabelProvider;
/**
 * Monitor table label provider.
 */
public class MonitorTableLabelProvider implements ITableLabelProvider {
	/**
	 * MonitorTableLabelProvider constructor comment.
	 */
	public MonitorTableLabelProvider() {
		super();
	}

	/**
	 * Adds a listener to this label provider. 
	 * Has no effect if an identical listener is already registered.
	 * <p>
	 * Label provider listeners are informed about state changes 
	 * that affect the rendering of the viewer that uses this label provider.
	 * </p>
	 *
	 * @param listener a label provider listener
	 */
	public void addListener(ILabelProviderListener listener) {
		// do nothing
	}

	/**
	 * Disposes of this label provider.  When a label provider is
	 * attached to a viewer, the viewer will automatically call
	 * this method when the viewer is being closed.  When label providers
	 * are used outside of the context of a viewer, it is the client's
	 * responsibility to ensure that this method is called when the
	 * provider is no longer needed.
	 */
	public void dispose() {
		// do nothing
	}

	/**
	 * Returns the label image for the given column of the given element.
	 *
	 * @param element the object representing the entire row, or 
	 *    <code>null</code> indicating that no input object is set
	 *    in the viewer
	 * @param columnIndex the zero-based index of the column in which
	 *   the label appears
	 */
	public Image getColumnImage(Object element, int columnIndex) {
		if (columnIndex == 0) {
			IMonitor monitor = (IMonitor) element;
			if (monitor.isRunning())
				return MonitorUIPlugin.getImage(MonitorUIPlugin.IMG_MONITOR_ON);
			return MonitorUIPlugin.getImage(MonitorUIPlugin.IMG_MONITOR_OFF);
		}
		return null;
	}

	/**
	 * Returns the label text for the given column of the given element.
	 *
	 * @param element the object representing the entire row, or
	 *   <code>null</code> indicating that no input object is set
	 *   in the viewer
	 * @param columnIndex the zero-based index of the column in which the label appears
	 */
	public String getColumnText(Object element, int columnIndex) {
		IMonitor monitor = (IMonitor) element;
		if (columnIndex == 0) {
			if (monitor.isRunning())
				return MonitorUIPlugin.getResource("%started");
			return MonitorUIPlugin.getResource("%stopped");
		} else if (columnIndex == 1)
			return monitor.getRemoteHost() + ":" + monitor.getRemotePort();
		else if (columnIndex == 2)
			return monitor.getProtocol();
		else if (columnIndex == 3)
			return monitor.getLocalPort() + "";
		else
			return "X";
	}
	
	protected String notNull(String s) {
		if (s == null)
			return "";
		
		return s;
	}

	/**
	 * Returns whether the label would be affected 
	 * by a change to the given property of the given element.
	 * This can be used to optimize a non-structural viewer update.
	 * If the property mentioned in the update does not affect the label,
	 * then the viewer need not update the label.
	 *
	 * @param element the element
	 * @param property the property
	 * @return <code>true</code> if the label would be affected,
	 *    and <code>false</code> if it would be unaffected
	 */
	public boolean isLabelProperty(Object element, String property) {
		return false;
	}

	/**
	 * Removes a listener to this label provider.
	 * Has no affect if an identical listener is not registered.
	 *
	 * @param listener a label provider listener
	 */
	public void removeListener(ILabelProviderListener listener) {
		// do nothing
	}
}