/*******************************************************************************
 * Copyright (c) 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.ui.internal.roles.ui;

import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.swt.graphics.Image;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.internal.Workbench;
import org.eclipse.ui.roles.IRole;
import org.eclipse.ui.roles.NotDefinedException;

/**
 * The RoleLabelProvider is a class that supplies the labels for the viewer in
 * the RolePreferencePage.
 */
public class RoleLabelProvider extends LabelProvider {

    /**
	 * Create a new instance of the receiver.
	 * 
	 * @since 3.0
	 */
    public RoleLabelProvider() {
    }

    /*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.viewers.ILabelProvider#getImage(java.lang.Object)
	 */
    public Image getImage(Object element) {
        return null;
    }

    /*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.viewers.ILabelProvider#getText(java.lang.Object)
	 */
    public String getText(Object element) {
        if (element instanceof String) {
            return getRoleText(((Workbench) PlatformUI.getWorkbench())
                    .getRoleManager()
                    .getRole((String) element));
        }
        else if (element instanceof IRole) {
            return getRoleText((IRole) element);
        }
        else {
            throw new IllegalArgumentException();
        }
    }

    /**
	 * @param role
	 * @return @since 3.0
	 */
    private String getRoleText(IRole role) {
        try {
            return role.getName();
        }
        catch (NotDefinedException e) {
            return role.getId();
        }
    }
}