com.aptana.ide.ui.io.navigator.resources.FileDragAdapterAssistant.java Source code

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Here is the source code for com.aptana.ide.ui.io.navigator.resources.FileDragAdapterAssistant.java

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/**
 * Aptana Studio
 * Copyright (c) 2005-2011 by Appcelerator, Inc. All Rights Reserved.
 * Licensed under the terms of the GNU Public License (GPL) v3 (with exceptions).
 * Please see the license.html included with this distribution for details.
 * 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.swt.dnd.Transfer;
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 {

    private static final Transfer[] SUPPORTED_TRANSFERS = new Transfer[] { FileTransfer.getInstance() };

    @Override
    public Transfer[] getSupportedTransferTypes() {
        return SUPPORTED_TRANSFERS;
    }

    @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.CACHE, 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()]);
    }
}