/*******************************************************************************
 * Copyright (c) 2000, 2003 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jface.action;

import org.eclipse.jface.util.Assert;

/**
 * Abstract superclass for group marker classes.
 * <p>
 * This class is not intended to be subclassed outside the framework.
 * </p>
 */
public abstract class AbstractGroupMarker extends ContributionItem {
/**
 * Constructor for use by subclasses.
 */
protected AbstractGroupMarker() {
}
/**
 * Create a new group marker with the given name.
 * The group name must not be <code>null</code> or the empty string.
 * The group name is also used as the item id.
 * 
 * @param groupName the name of the group
 */
protected AbstractGroupMarker(String groupName) {
	super(groupName);
	Assert.isTrue(groupName != null && groupName.length() > 0);
}
/**
 * Returns the group name.
 *
 * @return the group name
 */
public String getGroupName() {
	return getId();
}
/**
 * The <code>AbstractGroupMarker</code> implementation of this <code>IContributionItem</code>
 * method returns <code>true</code> iff the id is not <code>null</code>. Subclasses may override.
 */
public boolean isGroupMarker() {
	return getId() != null;
}
}