/*

 * Copyright (c) 2000, 2005, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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 General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package sun.awt.datatransfer;

import java.awt.datatransfer.DataFlavor;

import java.awt.datatransfer.Transferable;

import java.awt.datatransfer.UnsupportedFlavorException;

import java.io.IOException;

import java.util.HashMap;

import java.util.Iterator;

import java.util.Map;

/**

 * Reads all of the data from the system Clipboard which the data transfer

 * subsystem knows how to translate. This includes all text data, File Lists,

 * Serializable objects, Remote objects, and properly registered, arbitrary

 * data as InputStreams. The data is stored in byte format until requested

 * by client code. At that point, the data is converted, if necessary, into

 * the proper format to deliver to the application.

 *

 * This hybrid pre-fetch/delayed-rendering approach allows us to circumvent

 * the API restriction that client code cannot lock the Clipboard to discover

 * its formats before requesting data in a particular format, while avoiding

 * the overhead of fully rendering all data ahead of time.

 *

 * @author David Mendenhall

 * @author Danila Sinopalnikov

 *

 * @since 1.4 (appeared in modified form as FullyRenderedTransferable in 1.3.1)

 */

public class ClipboardTransferable implements Transferable {

    private final HashMap flavorsToData = new HashMap();

    private DataFlavor[] flavors = new DataFlavor[0];

    private final class DataFactory {

        final long format;

        final byte[] data;

        DataFactory(long format, byte[] data) {

            this.format = format;

            this.data   = data;

        }

        public Object getTransferData(DataFlavor flavor) throws IOException {

            return DataTransferer.getInstance().

                translateBytes(data, flavor, format,

                               ClipboardTransferable.this);

        }

    }

    public ClipboardTransferable(SunClipboard clipboard) {

        clipboard.openClipboard(null);

        try {

            long[] formats = clipboard.getClipboardFormats();

            if (formats != null && formats.length > 0) {

                // Since the SystemFlavorMap will specify many DataFlavors

                // which map to the same format, we should cache data as we

                // read it.

                HashMap cached_data = new HashMap(formats.length, 1.0f);

                Map flavorsForFormats = DataTransferer.getInstance().

                    getFlavorsForFormats(formats, SunClipboard.flavorMap);

                for (Iterator iter = flavorsForFormats.keySet().iterator();

                     iter.hasNext(); )

                {

                    DataFlavor flavor = (DataFlavor)iter.next();

                    Long lFormat = (Long)flavorsForFormats.get(flavor);

                    fetchOneFlavor(clipboard, flavor, lFormat, cached_data);

                }

                flavors = DataTransferer.getInstance().

            }

        } finally {

            clipboard.closeClipboard();

        }

    }

    private boolean fetchOneFlavor(SunClipboard clipboard, DataFlavor flavor,

                                   Long lFormat, HashMap cached_data)

    {

        if (!flavorsToData.containsKey(flavor)) {

            long format = lFormat.longValue();

            Object data = null;

            if (!cached_data.containsKey(lFormat)) {

                try {

                    data = clipboard.getClipboardData(format);

                } catch (IOException e) {

                    data = e;

                } catch (Throwable e) {

                    e.printStackTrace();

                }

                // Cache this data, even if it's null, so we don't have to go

                // to native code again for this format.

                cached_data.put(lFormat, data);

            } else {

                data = cached_data.get(lFormat);

            }

            // Casting IOException to byte array causes ClassCastException.

            // We should handle IOException separately - do not wrap them into

            // DataFactory and report failure.

            if (data instanceof IOException) {

                flavorsToData.put(flavor, data);

                return false;

            } else if (data != null) {

                flavorsToData.put(flavor, new DataFactory(format,

                                                          (byte[])data));

                return true;

            }

        }

        return false;

    }

    public DataFlavor[] getTransferDataFlavors() {

        return (DataFlavor[])flavors.clone();

    }

    public boolean isDataFlavorSupported(DataFlavor flavor) {

        return flavorsToData.containsKey(flavor);

    }

    public Object getTransferData(DataFlavor flavor)

        throws UnsupportedFlavorException, IOException

    {

        if (!isDataFlavorSupported(flavor)) {

            throw new UnsupportedFlavorException(flavor);

        }

        Object ret = flavorsToData.get(flavor);

        if (ret instanceof IOException) {

            // rethrow IOExceptions generated while fetching data

            throw (IOException)ret;

        } else if (ret instanceof DataFactory) {

            // Now we can render the data

            DataFactory factory = (DataFactory)ret;

            ret = factory.getTransferData(flavor);

        }

        return ret;

    }

}