/*
* @(#)CompositeTransferable.java 1.0 2002-04-07
*
* Copyright (c) 2001 Werner Randelshofer, Immensee, Switzerland.
* All rights reserved.
*
* You may not use, copy or modify this file, except in compliance with the
* license agreement you entered into with Werner Randelshofer.
* For details see accompanying license terms.
*/
package ch.randelshofer.gui.datatransfer;
import java.awt.datatransfer.*;
import java.util.*;
import java.io.*;
/**
*
*
* @author Werner Randelshofer
*/
public class CompositeTransferable implements java.awt.datatransfer.Transferable {
private HashMap<DataFlavor, Transferable> transferables = new HashMap<DataFlavor, Transferable>();
private LinkedList<DataFlavor> flavors = new LinkedList<DataFlavor>();
/** Creates a new instance of CompositeTransferable */
public CompositeTransferable() {
}
public void add(Transferable t) {
DataFlavor[] f = t.getTransferDataFlavors();
for (int i=0; i < f.length; i++) {
if (! transferables.containsKey(f[i])) flavors.add(f[i]);
transferables.put(f[i], t);
}
}
/**
* Returns an object which represents the data to be transferred. The class
* of the object returned is defined by the representation class of the flavor.
*
* @param flavor the requested flavor for the data
* @see DataFlavor#getRepresentationClass
* @exception IOException if the data is no longer available
* in the requested flavor.
* @exception UnsupportedFlavorException if the requested data flavor is
* not supported.
*/
public Object getTransferData(DataFlavor flavor) throws UnsupportedFlavorException, IOException {
Transferable t = transferables.get(flavor);
if (t == null) throw new UnsupportedFlavorException(flavor);
return t.getTransferData(flavor);
}
/**
* Returns an array of DataFlavor objects indicating the flavors the data
* can be provided in. The array should be ordered according to preference
* for providing the data (from most richly descriptive to least descriptive).
* @return an array of data flavors in which this data can be transferred
*/
public DataFlavor[] getTransferDataFlavors() {
return flavors.toArray(new DataFlavor[transferables.size()]);
}
/**
* Returns whether or not the specified data flavor is supported for
* this object.
* @param flavor the requested flavor for the data
* @return boolean indicating wjether or not the data flavor is supported
*/
public boolean isDataFlavorSupported(DataFlavor flavor) {
return transferables.containsKey(flavor);
}
}