/*
* 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 org.jaudiotagger.tag.id3.framebody;
import org.jaudiotagger.tag.InvalidTagException;
import org.jaudiotagger.tag.datatype.DataTypes;
import org.jaudiotagger.tag.datatype.NumberFixedLength;
import org.jaudiotagger.tag.datatype.NumberVariableLength;
import org.jaudiotagger.tag.datatype.StringNullTerminated;
import org.jaudiotagger.tag.id3.ID3v24Frames;
import java.nio.ByteBuffer;
/**
* Popularimeter frame.
* <p/>
* <p/>
* The purpose of this frame is to specify how good an audio file is.
* Many interesting applications could be found to this frame such as a
* playlist that features better audiofiles more often than others or it
* could be used to profile a person's taste and find other 'good' files
* by comparing people's profiles. The frame is very simple. It contains
* the email address to the user, one rating byte and a four byte play
* counter, intended to be increased with one for every time the file is
* played. The email is a terminated string. The rating is 1-255 where
* 1 is worst and 255 is best. 0 is unknown. If no personal counter is
* wanted it may be omitted. When the counter reaches all one's, one
* byte is inserted in front of the counter thus making the counter
* eight bits bigger in the same away as the play counter ("PCNT").
* There may be more than one "POPM" frame in each tag, but only one
* with the same email address.
* </p><p><table border=0 width="70%">
* <tr><td colspan=2> <Header for 'Popularimeter', ID: "POPM"></td></tr>
* <tr><td>Email to user</td><td><text string> $00</td></tr>
* <tr><td>Rating </td><td>$xx </td></tr>
* <tr><td>Counter </td><td>$xx xx xx xx (xx ...) </td></tr>
* </table></p>
* <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: FrameBodyPOPM.java 938 2010-12-10 13:17:22Z paultaylor $
* @todo : Counter should be optional, whereas we always expect it although allow a size of zero
* needs testing.
*/
public class FrameBodyPOPM extends AbstractID3v2FrameBody implements ID3v24FrameBody, ID3v23FrameBody
{
private static final int RATING_FIELD_SIZE = 1;
private static final int COUNTER_MINIMUM_FIELD_SIZE = 0;
public static final String MEDIA_MONKEY_NO_EMAIL = "no@email";
/**
* Creates a new FrameBodyPOPM datatype.
*/
public FrameBodyPOPM()
{
this.setObjectValue(DataTypes.OBJ_EMAIL, "");
this.setObjectValue(DataTypes.OBJ_RATING, (long) 0);
this.setObjectValue(DataTypes.OBJ_COUNTER, (long) 0);
}
public FrameBodyPOPM(FrameBodyPOPM body)
{
super(body);
}
/**
* Creates a new FrameBodyPOPM datatype.
*
* @param emailToUser
* @param rating
* @param counter
*/
public FrameBodyPOPM(String emailToUser, long rating, long counter)
{
this.setObjectValue(DataTypes.OBJ_EMAIL, emailToUser);
this.setObjectValue(DataTypes.OBJ_RATING, rating);
this.setObjectValue(DataTypes.OBJ_COUNTER, counter);
}
/**
* Creates a new FrameBodyPOPM datatype.
*
* @param byteBuffer
* @param frameSize
* @throws InvalidTagException if unable to create framebody from buffer
*/
public FrameBodyPOPM(ByteBuffer byteBuffer, int frameSize) throws InvalidTagException
{
super(byteBuffer, frameSize);
}
/**
* @param description
*/
public void setEmailToUser(String description)
{
setObjectValue(DataTypes.OBJ_EMAIL, description);
}
/**
* @return the memail of the user who rated this
*/
public String getEmailToUser()
{
return (String) getObjectValue(DataTypes.OBJ_EMAIL);
}
/**
* @return the rating given to this file
*/
public long getRating()
{
return ((Number) getObjectValue(DataTypes.OBJ_RATING)).longValue();
}
/**
* Set the rating given to this file
*
* @param rating
*/
public void setRating(long rating)
{
setObjectValue(DataTypes.OBJ_RATING, rating);
}
/**
* @return the play count of this file
*/
public long getCounter()
{
return ((Number) getObjectValue(DataTypes.OBJ_COUNTER)).longValue();
}
/**
* Set the play counter of this file
*
* @param counter
*/
public void setCounter(long counter)
{
setObjectValue(DataTypes.OBJ_COUNTER, counter);
}
/**
* The ID3v2 frame identifier
*
* @return the ID3v2 frame identifier for this frame type
*/
public String getIdentifier()
{
return ID3v24Frames.FRAME_ID_POPULARIMETER;
}
public String getUserFriendlyValue()
{
return getEmailToUser()+":"+getRating()+":"+getCounter();
}
public void parseString(String data)
{
try
{
int value = Integer.parseInt(data);
setRating(value);
setEmailToUser(MEDIA_MONKEY_NO_EMAIL);
}
catch(NumberFormatException nfe)
{
}
}
/**
*
*/
protected void setupObjectList()
{
objectList.add(new StringNullTerminated(DataTypes.OBJ_EMAIL, this));
objectList.add(new NumberFixedLength(DataTypes.OBJ_RATING, this, RATING_FIELD_SIZE));
objectList.add(new NumberVariableLength(DataTypes.OBJ_COUNTER, this, COUNTER_MINIMUM_FIELD_SIZE));
}
}
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