FileDragAdapterAssistant.java

/**
 * This file Copyright (c) 2005-2010 Aptana, Inc. This program is
 * dual-licensed under both the Aptana Public License and the GNU General
 * Public license. You may elect to use one or the other of these licenses.
 * 
 * This program is distributed in the hope that it will be useful, but
 * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
 * NONINFRINGEMENT. Redistribution, except as permitted by whichever of
 * the GPL or APL you select, is prohibited.
 *
 * 1. For the GPL license (GPL), you can redistribute and/or modify this
 * program under the terms of the GNU General Public License,
 * Version 3, as published by the Free Software Foundation.  You should
 * have received a copy of the GNU General Public License, Version 3 along
 * with this program; if not, write to the Free Software Foundation, Inc., 51
 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 * 
 * Aptana provides a special exception to allow redistribution of this file
 * with certain other free and open source software ("FOSS") code and certain additional terms
 * pursuant to Section 7 of the GPL. You may view the exception and these
 * terms on the web at http://www.aptana.com/legal/gpl/.
 * 
 * 2. For the Aptana Public License (APL), this program and the
 * accompanying materials are made available under the terms of the APL
 * v1.0 which accompanies this distribution, and is available at
 * http://www.aptana.com/legal/apl/.
 * 
 * You may view the GPL, Aptana's exception and additional terms, and the
 * APL in the file titled license.html at the root of the corresponding
 * plugin containing this source file.
 * 
 * Any modifications to this file must keep this entire header intact.
 */
package com.aptana.ide.ui.io.navigator.resources;

import java.io.File;
import java.util.ArrayList;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;

import org.eclipse.core.filesystem.EFS;
import org.eclipse.core.filesystem.IFileStore;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.jface.util.LocalSelectionTransfer;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.swt.dnd.DragSourceEvent;
import org.eclipse.swt.dnd.FileTransfer;
import org.eclipse.ui.navigator.resources.ResourceDragAdapterAssistant;

import com.aptana.ide.ui.io.FileSystemUtils;

/**
 * @author Michael Xia (mxia@aptana.com)
 */
public class FileDragAdapterAssistant extends ResourceDragAdapterAssistant {

    @Override
    public boolean setDragData(DragSourceEvent anEvent, IStructuredSelection aSelection) {
        boolean result = super.setDragData(anEvent, aSelection);
        if (result) {
            return true;
        }

        IFileStore[] fileStores = getSelectedFiles(aSelection);
        if (fileStores.length > 0) {
            if (LocalSelectionTransfer.getTransfer().isSupportedType(anEvent.dataType)) {
                anEvent.data = fileStores;
                return true;
            }

            if (FileTransfer.getInstance().isSupportedType(anEvent.dataType)) {
                List<String> filenames = new ArrayList<String>();
                File file;
                for (IFileStore fileStore : fileStores) {
                    try {
                        file = fileStore.toLocalFile(EFS.NONE, null);
                        if (file != null) {
                            filenames.add(file.getAbsolutePath());
                        }
                    } catch (CoreException e) {
                    }
                }
                if (filenames.isEmpty()) {
                    return false;
                }
                anEvent.data = filenames.toArray(new String[filenames.size()]);
                return true;
            }
        }
        return false;
    }

    private IFileStore[] getSelectedFiles(IStructuredSelection aSelection) {
        Set<IFileStore> files = new LinkedHashSet<IFileStore>();
        IFileStore file;
        Object[] selectedElements = aSelection.toArray();
        for (Object selected : selectedElements) {
            file = FileSystemUtils.getFileStore(selected);
            if (file != null) {
                files.add(file);
            }
        }
        return files.toArray(new IFileStore[files.size()]);
    }
}