BackDownloadCommand.java

/*******************************************************************************
 * Copyright (c) 2011-2012 Nokia Corporation
 * 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:
 * Comarch team - initial API and implementation
 *******************************************************************************/
package org.ned.client.command;

import com.sun.lwuit.Command;
import org.ned.client.NedConsts;
import org.ned.client.NedResources;
import org.ned.client.library.advanced.LibraryElement;
import org.ned.client.view.CatalogScreen;
import org.ned.client.view.CategoryScreen;
import org.ned.client.view.MainScreen;
import org.ned.client.view.MediaItemsScreen;

public class BackDownloadCommand extends BackNedCommand {

    private static BackDownloadCommand instance;

    private BackDownloadCommand() {
        command = new Command( NedResources.MID_BACK_COMMAND );
    }

    public static BackDownloadCommand getInstance() {
        if ( instance == null ) {
            instance = new BackDownloadCommand();
        }
        return instance;
    }

    protected void doAction( Object previousItem ) {
        LibraryElement currentContent = (LibraryElement)previousItem;
        if ( previousItem == null ) {
            new MainScreen().show();
        } else if ( currentContent.getType().equals( NedConsts.NedContentType.LIBRARY ) ) {
            new CatalogScreen( currentContent.getId() ).showBack();
        } else if ( currentContent.getType().equals( NedConsts.NedContentType.CATALOG ) ) {
            new CategoryScreen( currentContent.getId() ).showBack();
        } else if ( currentContent.getType().equals( NedConsts.NedContentType.CATEGORY ) ) {
            new MediaItemsScreen( currentContent.getId() ).showBack();
        } else if ( currentContent.isMediaType() ) {
            new MediaItemsScreen( currentContent ).showBack();
        }
    }
}