ItemDropAdapter.java

/*
 * This file is part of the OpenSCADA project
 * Copyright (C) 2006-2012 TH4 SYSTEMS GmbH (http://th4-systems.com)
 *
 * OpenSCADA is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License version 3
 * only, as published by the Free Software Foundation.
 *
 * OpenSCADA is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License version 3 for more details
 * (a copy is included in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU Lesser General Public License
 * version 3 along with OpenSCADA. If not, see
 * <http://opensource.org/licenses/lgpl-3.0.html> for a copy of the LGPLv3 License.
 */

package org.openscada.da.ui.widgets.realtime;

import java.net.URI;
import java.net.URISyntaxException;

import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerDropAdapter;
import org.eclipse.swt.dnd.TextTransfer;
import org.eclipse.swt.dnd.TransferData;
import org.openscada.da.ui.connection.data.Item;
import org.openscada.da.ui.connection.data.Item.Type;
import org.openscada.da.ui.connection.dnd.ItemTransfer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ItemDropAdapter extends ViewerDropAdapter
{

    private final static Logger logger = LoggerFactory.getLogger ( ItemDropAdapter.class );

    private final RealtimeListAdapter list;

    public ItemDropAdapter ( final Viewer viewer, final RealtimeListAdapter list )
    {
        super ( viewer );
        this.list = list;
        setFeedbackEnabled ( true );
        setSelectionFeedbackEnabled ( true );
    }

    @Override
    public boolean performDrop ( final Object data )
    {
        logger.debug ( "Dropping: {}", data );

        if ( data instanceof Item[] )
        {
            dropItems ( (Item[])data );
            return true;
        }
        if ( data instanceof String )
        {
            dropString ( data );
            return true;
        }
        return false;
    }

    private void dropString ( final Object data )
    {
        final TreeViewer viewer = (TreeViewer)getViewer ();
        final String toks[] = ( (String)data ).split ( "[\\n\\r]+" ); //$NON-NLS-1$
        for ( final String tok : toks )
        {
            try
            {
                final URI uri = new URI ( tok );
                if ( uri.getScheme () == null )
                {
                    final String[] stoks = tok.split ( "#" );
                    final Item item = new Item ( stoks[0], stoks[1], Type.ID );
                    dropItem ( item, viewer );
                }
                else if ( uri.getFragment () != null )
                {
                    final String[] stoks = tok.split ( "#", 2 );
                    final Item item = new Item ( stoks[0], uri.getFragment (), Type.URI );
                    dropItem ( item, viewer );
                }

            }
            catch ( final URISyntaxException e )
            {
                final String[] stoks = tok.split ( "#" );
                final Item item = new Item ( stoks[0], stoks[1], Type.ID );
                dropItem ( item, viewer );
            }
        }
    }

    private void dropItems ( final Item[] items )
    {
        final TreeViewer viewer = (TreeViewer)getViewer ();

        for ( final Item item : items )
        {
            dropItem ( item, viewer );
        }
    }

    private void dropItem ( final Item item, final TreeViewer viewer )
    {
        logger.info ( "Dropped item: {} ({})", item, item.getType () );

        final ListEntry entry = new ListEntry ();
        entry.setDataItem ( new Item ( item ) );
        this.list.add ( entry );
    }

    @Override
    public boolean validateDrop ( final Object target, final int operation, final TransferData transferData )
    {
        if ( ItemTransfer.getInstance ().isSupportedType ( transferData ) )
        {
            return true;
        }
        if ( TextTransfer.getInstance ().isSupportedType ( transferData ) )
        {
            return true;
        }
        return false;
    }

}