framebodylink.java

java+eclipse做的TTPlayer

/*
 *  MusicTag Copyright (C)2003,2004
 *
 *  This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser
 *  General Public  License as published by the Free Software Foundation; either version 2.1 of the License,
 *  or (at your option) any later version.
 *
 *  This library 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.
 *
 *  You should have received a copy of the GNU Lesser General Public License along with this library; if not,
 *  you can get a copy from http://www.opensource.org/licenses/lgpl-license.php or write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package com.hadeslee.audiotag.tag.id3.framebody;

import com.hadeslee.audiotag.tag.InvalidTagException;
import com.hadeslee.audiotag.tag.datatype.DataTypes;
import com.hadeslee.audiotag.tag.datatype.StringFixedLength;
import com.hadeslee.audiotag.tag.datatype.StringNullTerminated;
import com.hadeslee.audiotag.tag.datatype.StringSizeTerminated;
import com.hadeslee.audiotag.tag.id3.ID3v24Frames;

import java.nio.ByteBuffer;

/**
 * Linked information frame.
 * 
 * <p>
 * To keep space waste as low as possible this frame may be used to link
 * information from another ID3v2 tag that might reside in another audio
 * file or alone in a binary file. It is recommended that this method is
 * only used when the files are stored on a CD-ROM or other
 * circumstances when the risk of file seperation is low. The frame
 * contains a frame identifier, which is the frame that should be linked
 * into this tag, a URL field, where a reference to the file where
 * the frame is given, and additional ID data, if needed. Data should be
 * retrieved from the first tag found in the file to which this link
 * points. There may be more than one "LINK" frame in a tag, but only
 * one with the same contents. A linked frame is to be considered as
 * part of the tag and has the same restrictions as if it was a physical
 * part of the tag (i.e. only one "RVRB" frame allowed, whether it's
 * linked or not).
 * </p><p><table border=0 width="70%">
 * <tr><td>&lt;Header for 'Linked information', ID: "LINK"&gt;   </td></tr>
 * <tr><td>Frame identifier      </td><td>$xx xx xx              </td></tr>
 * <tr><td>URL                   </td><td>&lt;text string&gt; $00</td></tr>
 * <tr><td>ID and additional data</td><td>&lt;text string(s)&gt; </td></tr>
 * </table></p>
 * <p>
 * Frames that may be linked and need no additional data are "IPLS",
 * "MCID", "ETCO", "MLLT", "SYTC", "RVAD", "EQUA", "RVRB", "RBUF", the
 * text information frames and the URL link frames.
 * </p><p>
 * The "TXXX", "APIC", "GEOB" and "AENC" frames may be linked with
 * the content descriptor as additional ID data.
 * </p><p>
 * The "COMM", "SYLT" and "USLT" frames may be linked with three bytes
 * of language descriptor directly followed by a content descriptor as
 * additional ID data.
 * </p>
 * 
 * <p>For more details, please refer to the ID3 specifications:
 * <ul>
 * <li><a href="http://www.id3.org/id3v2.3.0.txt">ID3 v2.3.0 Spec</a>
 * </ul>
 * 
 * @author : Paul Taylor
 * @author : Eric Farng
 * @version $Id: FrameBodyLINK.java,v 1.11 2007/08/06 16:04:34 paultaylor Exp $
 */
public class FrameBodyLINK extends AbstractID3v2FrameBody implements ID3v24FrameBody,ID3v23FrameBody
{
    /**
     * Creates a new FrameBodyLINK datatype.
     */
    public FrameBodyLINK()
    {
        //        this.setObject("Frame Identifier", "");
        //        this.setObject("URL", "");
        //        this.setObject("ID and Additional Data", "");
    }

    public FrameBodyLINK(FrameBodyLINK body)
    {
        super(body);
    }

    /**
     * Creates a new FrameBodyLINK datatype.
     *
     * @param frameIdentifier 
     * @param url             
     * @param additionalData  
     */
    public FrameBodyLINK(String frameIdentifier, String url, String additionalData)
    {
        this.setObjectValue(DataTypes.OBJ_DESCRIPTION, frameIdentifier);
        this.setObjectValue(DataTypes.OBJ_URL, url);
        this.setObjectValue(DataTypes.OBJ_ID, additionalData);
    }

    /**
     * Creates a new FrameBodyLINK datatype.
     *
     * @throws InvalidTagException if unable to create framebody from buffer 
     */
    public FrameBodyLINK(ByteBuffer byteBuffer, int frameSize)
        throws  InvalidTagException
    {
        super(byteBuffer, frameSize);
    }

    /**
     * 
     *
     * @return 
     */
    public String getAdditionalData()
    {
        return (String) getObjectValue(DataTypes.OBJ_ID);
    }

    /**
     * 
     *
     * @param additionalData 
     */
    public void getAdditionalData(String additionalData)
    {
        setObjectValue(DataTypes.OBJ_ID, additionalData);
    }

    /**
     * 
     *
     * @return 
     */
    public String getFrameIdentifier()
    {
        return (String) getObjectValue(DataTypes.OBJ_DESCRIPTION);
    }

    /**
     * 
     *
     * @param frameIdentifier 
     */
    public void getFrameIdentifier(String frameIdentifier)
    {
        setObjectValue(DataTypes.OBJ_DESCRIPTION, frameIdentifier);
    }

    /**
      * The ID3v2 frame identifier
      *
      * @return the ID3v2 frame identifier  for this frame type
     */
    public String getIdentifier()
    {
        return ID3v24Frames.FRAME_ID_LINKED_INFO;
    }
    

    /**
     * 
     */
    protected void setupObjectList()
    {
        objectList.add(new StringFixedLength(DataTypes.OBJ_DESCRIPTION, this, 4));
        objectList.add(new StringNullTerminated(DataTypes.OBJ_URL, this));
        objectList.add(new StringSizeTerminated(DataTypes.OBJ_ID, this));
    }
}