/*
 * Copyright (c) 2006, 2017, Oracle and/or its affiliates. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * -Redistribution of source code must retain the above copyright notice, this
 *  list of conditions and the following disclaimer.
 *
 * -Redistribution in binary form must reproduce the above copyright notice,
 *  this list of conditions and the following disclaimer in the documentation
 *  and/or other materials provided with the distribution.
 *
 * Neither the name of Oracle nor the names of contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
 * ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
 * OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MICROSYSTEMS, INC. ("SUN")
 * AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE
 * AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
 * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST
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 * OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
 * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 */

import javax.jnlp.ClipboardService;
import javax.jnlp.ServiceManager;
import javax.jnlp.UnavailableServiceException;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.StringSelection;
import java.awt.datatransfer.DataFlavor;
import java.io.IOException;

/**
 */
public class ClipboardHandler {
    static private boolean _initialized = false;
    static private ClipboardService _cs = null;
    static private String _content = "";

    public static void toClipboard(String txt) {
        System.out.println("toClipboard: " + txt);
        initialize();
        if (_cs != null) {
            _cs.setContents(new StringSelection(txt));
        } else {
            _content = txt;
        }
    }

    public static String fromClipboard() {
        System.out.println("fromClipboard: ");
        initialize();
        if (_cs != null) {
            Transferable t = _cs.getContents();
            try {
                return (String)t.getTransferData(DataFlavor.stringFlavor);
            } catch(Throwable ex) {
                System.out.println(ex);
                return "";
            }
        } else {
            return _content;
        }
    }

    static private synchronized void initialize() {
        if (_initialized) return;
        _initialized = true;
        try {
            _cs = (ClipboardService)ServiceManager.lookup("javax.jnlp.ClipboardService");
        } catch(UnavailableServiceException e) {
            _cs = null;
        }
    }
}