/*
 * SimplyHTML, a word processor based on Java, HTML and CSS
 * Copyright (C) 2002 Ulrich Hilger
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */
package com.lightdev.app.shtm;

import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.io.IOException;

/**
 * A transferable for HTML text.
 *
 * <p>It can be used in drag and drop operations or in copy and paste
 * operations. Additional to <code>HTMLText</code> it supports the
 * <code>String</code> data flavor.</p>
 *
 * @author Ulrich Hilger
 * @author Light Development
 * @author <a href="http://www.lightdev.com">http://www.lightdev.com</a>
 * @author <a href="mailto:info@lightdev.com">info@lightdev.com</a>
 * @author published under the terms and conditions of the
 *      GNU General Public License,
 *      for details see file gpl.txt in the distribution
 *      package of this software
 *
 * 
 *
 * @see java.awt.datatransfer.DataFlavor.stringFlavor
 * @see java.awt.datatransfer.DataFlavor.plainTextFlavor
 * @see com.lightdev.app.shtm.HTMLText
 */
class HTMLTextSelection implements Transferable {
    /** index of HTML text data flavor */
    private static final int HTML_TEXT = 0;
    /** the data to transfer */
    private final HTMLText data;
    /** the data flavor of this transferable */
    private static final DataFlavor[] flavors = { new DataFlavor(com.lightdev.app.shtm.HTMLText.class, "HTMLText") };

    /**
     * construct a <code>HTMLTextSelection</code> with a chunk
     * of styled text.
     *
     * @param data - a HTMLText object
     *
     * @see com.lightdev.app.shtm.HTMLText
     */
    public HTMLTextSelection(final HTMLText data) {
        this.data = data;
    }

    /* ---- start of Transferable implementation ----------------------------*/
    /**
     * 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 (DataFlavor[]) flavors.clone();
    }

    /**
     * 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(final DataFlavor flavor) {
        for (int i = 0; i < flavors.length; i++) {
            if (flavors[i].equals(flavor)) {
                return true;
            }
        }
        return false;
    }

    /**
     * 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(final DataFlavor flavor) throws UnsupportedFlavorException, IOException {
        if (flavor.equals(flavors[HTML_TEXT])) {
            return data;
        }
        else {
            throw new UnsupportedFlavorException(flavor);
        }
    }
    /* ----------- end of Transferable implementation ------------------- */
}