ClipUtils.java

/*
*   EuroCarbDB, a framework for carbohydrate bioinformatics
*
*   Copyright (c) 2006-2009, Eurocarb project, or third-party contributors as
*   indicated by the @author tags or express copyright attribution
*   statements applied by the authors.  
*
*   This copyrighted material is made available to anyone wishing to use, modify,
*   copy, or redistribute it subject to the terms and conditions of the GNU
*   Lesser General Public License, as published by the Free Software Foundation.
*   A copy of this license accompanies this distribution in the file LICENSE.txt.
*
*   This program 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.
*
*   Last commit: $Rev: 1210 $ by $Author: glycoslave $ on $Date:: 2009-06-12 #$  
*/

package org.eurocarbdb.application.glycanbuilder;

import java.util.*;
import java.io.*;
import java.awt.*;
import java.awt.image.*;
import java.awt.datatransfer.*;
import java.awt.Toolkit;

/**
   Utility class with methods to access the system clipboard.
   
   @author Alessio Ceroni (a.ceroni@imperial.ac.uk)
*/

public class ClipUtils {

    protected static final Clipboard local_clipboard;  
    static {    
    local_clipboard = new Clipboard("GWB");
    }         

    private ClipUtils() {}

    /**
       Set the contents of the system clipboard from a transferable
       object. If the system clipboard is not available
       use an application wide clipboard.
     */
    static public void setContents(Transferable t) {
    try {
        Toolkit.getDefaultToolkit().getSystemClipboard().setContents(t,null);
    }
    catch(SecurityException se) {
        local_clipboard.setContents(t,null);
    }    
    }

    /**
       Set the contents of the system clipboard from an image
       transferable object. If the system clipboard is not available
       use an application wide clipboard.
     */
    static public void setContents(BufferedImage img) {
    try {
        Toolkit.getDefaultToolkit().getSystemClipboard().setContents(new ImageTransferable(img),null);
    }
    catch(SecurityException se) {
        local_clipboard.setContents(new ImageTransferable(img),null);
    }
    }

    /**
       Return the contents of the system clipboard. If the system
       clipboard is not available use an application wide clipboard.
     */
    static public Transferable getContents() {
    try {
        return Toolkit.getDefaultToolkit().getSystemClipboard().getContents(null);
    }
    catch(SecurityException se) {
        return local_clipboard.getContents(null);
    }    
    }

    /**
       Print the flavours available for a transferable object.
     */
    static public void showFlavors(Transferable t) {
    
    DataFlavor[] flavors = t.getTransferDataFlavors();
    for(int i=0; i<flavors.length; i++ ) {
        System.out.println(flavors[i].getMimeType() + ": " + flavors[i].getHumanPresentableName());
    }        
    }
}

class ImageTransferable implements Transferable {
    
    static private DataFlavor [] imageFlavors;

    static public DataFlavor imageFlavor;
    static public DataFlavor bmpFlavor;
    static public DataFlavor pngFlavor;
    static public DataFlavor jpegFlavor;
   
    static {    
    imageFlavors = new DataFlavor[4];
    imageFlavors[0] = imageFlavor = DataFlavor.imageFlavor;
    imageFlavors[1] = bmpFlavor = new DataFlavor("image/bmp","image/bmp");
    imageFlavors[2] = pngFlavor = new DataFlavor("image/png","image/png");
    imageFlavors[3] = jpegFlavor = new DataFlavor("image/jpeg","image/jpeg");    
    }

    private BufferedImage theImage = null;

    public ImageTransferable(BufferedImage img) {
    theImage = img;
    }

    public DataFlavor[] getTransferDataFlavors () {    
    return imageFlavors;
    }


    public boolean isDataFlavorSupported (DataFlavor parFlavor) {
    if( parFlavor==null )
        throw new NullPointerException();

    for( int i=0; i<imageFlavors.length; i++ ) {
        if( parFlavor.equals(imageFlavors[i]) )
        return true;
    }
    return false;
    }
  
    public synchronized Object getTransferData (DataFlavor parFlavor) throws UnsupportedFlavorException, IOException {
    if( parFlavor==null )
        throw new NullPointerException();
           
    if( theImage!=null ) {
        if( parFlavor.equals(imageFlavor) ) 
        return getImage();    
        if (parFlavor.equals(bmpFlavor) ) 
        return getImageStream("bmp");    
        if (parFlavor.equals(pngFlavor) ) 
        return getImageStream("png");    
        if (parFlavor.equals(jpegFlavor) ) 
        return getImageStream("jpeg");    
    }

    throw new UnsupportedFlavorException(parFlavor);
    }

    public BufferedImage getImage() {
    return theImage;
    }

    public InputStream getImageStream(String format) {
    try {
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        javax.imageio.ImageIO.write(getImage(),format,bos);
        return new ByteArrayInputStream(bos.toByteArray());
    }
    catch(Exception e) {
        LogUtils.report(e);
        return null;
    }
    }
}