/*******************************************************************************
 * Copyright (c) 2006, 2015 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/

package org.eclipse.jface.viewers;

import org.eclipse.core.commands.common.EventManager;
import org.eclipse.jface.util.SafeRunnable;

/**
 * BaseLabelProvider is a default concrete implementation of
 * {@link IBaseLabelProvider}
 *
 * @since 3.3
 *
 */
public class BaseLabelProvider extends EventManager implements IBaseLabelProvider {

    @Override
	public void addListener(ILabelProviderListener listener) {
        addListenerObject(listener);
    }

    /**
     * The <code>BaseLabelProvider</code> implementation of this
     * <code>IBaseLabelProvider</code> method clears its internal listener list.
     * Subclasses may extend but should call the super implementation.
     */
    @Override
	public void dispose() {
    	clearListeners();
    }

    /**
     * The <code>BaseLabelProvider</code> implementation of this
     * <code>IBaseLabelProvider</code> method returns <code>true</code>. Subclasses may
     * override.
     */
    @Override
	public boolean isLabelProperty(Object element, String property) {
        return true;
    }

    @Override
	public void removeListener(ILabelProviderListener listener) {
        removeListenerObject(listener);
    }

    /**
	 * Fires a label provider changed event to all registered listeners Only
	 * listeners registered at the time this method is called are notified.
	 *
	 * @param event
	 *            a label provider changed event
	 *
	 * @see ILabelProviderListener#labelProviderChanged
	 */
	protected void fireLabelProviderChanged(final LabelProviderChangedEvent event) {
		Object[] listeners = getListeners();
		for (Object listener : listeners) {
			final ILabelProviderListener l = (ILabelProviderListener) listener;
			SafeRunnable.run(new SafeRunnable() {
				@Override
				public void run() {
					l.labelProviderChanged(event);
				}
			});

		}
	}
}
