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/*
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* Copyright 2000-2005 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package sun.awt.datatransfer;
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import java.awt.datatransfer.DataFlavor;
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import java.awt.datatransfer.Transferable;
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import java.awt.datatransfer.UnsupportedFlavorException;
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import java.io.IOException;
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import java.util.HashMap;
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import java.util.Iterator;
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import java.util.Map;
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/**
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* Reads all of the data from the system Clipboard which the data transfer
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* subsystem knows how to translate. This includes all text data, File Lists,
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* Serializable objects, Remote objects, and properly registered, arbitrary
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* data as InputStreams. The data is stored in byte format until requested
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* by client code. At that point, the data is converted, if necessary, into
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* the proper format to deliver to the application.
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*
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* This hybrid pre-fetch/delayed-rendering approach allows us to circumvent
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* the API restriction that client code cannot lock the Clipboard to discover
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* its formats before requesting data in a particular format, while avoiding
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* the overhead of fully rendering all data ahead of time.
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*
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* @author David Mendenhall
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* @author Danila Sinopalnikov
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*
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* @since 1.4 (appeared in modified form as FullyRenderedTransferable in 1.3.1)
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*/
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public class ClipboardTransferable implements Transferable {
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private final HashMap flavorsToData = new HashMap();
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private DataFlavor[] flavors = new DataFlavor[0];
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private final class DataFactory {
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final long format;
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final byte[] data;
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DataFactory(long format, byte[] data) {
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this.format = format;
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this.data = data;
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}
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public Object getTransferData(DataFlavor flavor) throws IOException {
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return DataTransferer.getInstance().
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translateBytes(data, flavor, format,
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ClipboardTransferable.this);
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}
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}
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public ClipboardTransferable(SunClipboard clipboard) {
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clipboard.openClipboard(null);
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try {
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long[] formats = clipboard.getClipboardFormats();
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if (formats != null && formats.length > 0) {
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// Since the SystemFlavorMap will specify many DataFlavors
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// which map to the same format, we should cache data as we
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// read it.
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HashMap cached_data = new HashMap(formats.length, 1.0f);
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Map flavorsForFormats = DataTransferer.getInstance().
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getFlavorsForFormats(formats, SunClipboard.flavorMap);
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for (Iterator iter = flavorsForFormats.keySet().iterator();
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iter.hasNext(); )
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{
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DataFlavor flavor = (DataFlavor)iter.next();
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Long lFormat = (Long)flavorsForFormats.get(flavor);
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fetchOneFlavor(clipboard, flavor, lFormat, cached_data);
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}
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flavors = DataTransferer.getInstance().
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setToSortedDataFlavorArray(flavorsToData.keySet(),
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flavorsForFormats);
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}
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} finally {
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clipboard.closeClipboard();
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}
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}
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private boolean fetchOneFlavor(SunClipboard clipboard, DataFlavor flavor,
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Long lFormat, HashMap cached_data)
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{
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if (!flavorsToData.containsKey(flavor)) {
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long format = lFormat.longValue();
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Object data = null;
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if (!cached_data.containsKey(lFormat)) {
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try {
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data = clipboard.getClipboardData(format);
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} catch (IOException e) {
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data = e;
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} catch (Throwable e) {
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e.printStackTrace();
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}
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// Cache this data, even if it's null, so we don't have to go
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// to native code again for this format.
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cached_data.put(lFormat, data);
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} else {
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data = cached_data.get(lFormat);
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}
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// Casting IOException to byte array causes ClassCastException.
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// We should handle IOException separately - do not wrap them into
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// DataFactory and report failure.
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if (data instanceof IOException) {
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flavorsToData.put(flavor, data);
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return false;
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} else if (data != null) {
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flavorsToData.put(flavor, new DataFactory(format,
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(byte[])data));
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return true;
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}
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}
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return false;
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}
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public DataFlavor[] getTransferDataFlavors() {
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return (DataFlavor[])flavors.clone();
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}
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public boolean isDataFlavorSupported(DataFlavor flavor) {
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return flavorsToData.containsKey(flavor);
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}
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public Object getTransferData(DataFlavor flavor)
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throws UnsupportedFlavorException, IOException
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{
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if (!isDataFlavorSupported(flavor)) {
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throw new UnsupportedFlavorException(flavor);
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}
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Object ret = flavorsToData.get(flavor);
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if (ret instanceof IOException) {
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// rethrow IOExceptions generated while fetching data
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throw (IOException)ret;
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} else if (ret instanceof DataFactory) {
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// Now we can render the data
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DataFactory factory = (DataFactory)ret;
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ret = factory.getTransferData(flavor);
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}
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return ret;
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}
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}
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