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Open Source (LGPL) 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
 *
 @LICENSE@
 *
 * ---------------
 * 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.examples.viewer.commands.OpenFile;
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 boolean isValid = OpenFile.isSupportedFileExtension(file.toLowerCase());

        if (isValid) {
            currentCommands.handleTransferedFile(file);
        } else {
            currentGUI.showMessageDialog("You may only import a valid PDF or image");
        }
    }
}