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An Open Source JavaFX PDF Viewer
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/*
 * ===========================================
 * Java Pdf Extraction Decoding Access Library
 * ===========================================
 *
 * Project Info:  http://www.idrsolutions.com
 * Help section for developers at http://www.idrsolutions.com/support/
 *
 * (C) Copyright 1997-2017 IDRsolutions and Contributors.
 *
 * This file is part of JPedal/JPDF2HTML5
 *
     This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library 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 for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA


 *
 * ---------------
 * SingleViewTransferHandler.java
 * ---------------
 */
package org.jpedal.examples.viewer.gui;

import java.awt.datatransfer.Transferable;
import java.io.File;
import java.util.List;
import javax.swing.JComponent;
import org.jpedal.examples.viewer.Commands;
import org.jpedal.examples.viewer.Values;
import org.jpedal.exception.PdfException;
import org.jpedal.gui.GUIFactory;
import org.jpedal.utils.LogWriter;

public class SingleViewTransferHandler extends BaseTransferHandler{

	public SingleViewTransferHandler(final Values commonValues, final GUIFactory currentGUI, final Commands currentCommands) {
		super(commonValues, currentGUI, currentCommands);
	}

	@Override
    public boolean importData(final JComponent src, final Transferable transferable) {
		try {
			final Object dragImport = getImport(transferable);

			if (dragImport instanceof String) {
				final String url = (String) dragImport;
				
				if (url.indexOf("file:/") != url.lastIndexOf("file:/")) // make sure only one url is in the String
                {
                    currentGUI.showMessageDialog("You may only import 1 file at a time");
                } else {
                    openFile(url);
                }
			} else if (dragImport instanceof List) {
				final List files = (List) dragImport;
				
                //System.out.println("list = " + list);
                if (files.size() == 1) { // we can process
					final File file = (File) files.get(0);
					openFile(file.getAbsolutePath());
				} else {
					currentGUI.showMessageDialog("You may only import 1 file at a time");
				}
			}
		} catch (final Exception e) {
			LogWriter.writeLog("Exception e "+e.getMessage());
			return false;
		}
		
		return true;
	}

	protected void openFile(final String file) throws PdfException {
		final String testFile = file.toLowerCase();
		
		final boolean isValid = ((testFile.endsWith(".pdf"))
                || (testFile.endsWith(".dcm")) || (testFile.endsWith(".psd"))
                || (testFile.endsWith(".sgi")) || (testFile.endsWith(".rgb"))
				|| (testFile.endsWith(".fdf")) || (testFile.endsWith(".tiff"))
				|| (testFile.endsWith(".tif")) || (testFile.endsWith(".png"))
				|| (testFile.endsWith(".jpg")) || (testFile.endsWith(".jpeg"))
                || (testFile.endsWith(".jpx")) || (testFile.endsWith(".jp2")) 
                || (testFile.endsWith(".j2k")));
	
		if (isValid) {
			currentCommands.handleTransferedFile(file);
		} else {
			currentGUI.showMessageDialog("You may only import a valid PDF or image");
		}
	}	
}