/*
* POPMID3V2Frame.java
*
* Created on September 3, 2004, 11:11 PM
*
* Copyright (C)2004,2005 Paul Grebenc
*
* 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* $Id: POPMID3V2Frame.java,v 1.11 2005/02/06 18:11:23 paul Exp $
*/
package org.blinkenlights.jid3.v2;
import java.io.*;
import org.blinkenlights.jid3.*;
import org.blinkenlights.jid3.io.*;
import org.blinkenlights.jid3.util.*;
/** Frame containing a popularimeter.
*
* @author paul
*/
public class POPMID3V2Frame extends ID3V2Frame
{
private String m_sEmailToUser = null;
private int m_iPopularity;
//NOTE: No support for play counts greater than 2^31 (is a value out of this range realistic???)
private int m_iPlayCount;
/** Creates a new instance of POPMID3V2Frame.
*
* @param sEmailToUser the email address of the user to be informed of this track's popularity
* @param iPopularity the popularity rating of this track (1=worst, 255=best, 0=unknown)
* @param iPlayCount the current playcount of this file (must be positive)
* @throws ID3Exception if sEmailToUser not provided, or if either iPopularity or iPlayCount values are out of range
*/
public POPMID3V2Frame(String sEmailToUser, int iPopularity, int iPlayCount)
throws ID3Exception
{
if ((sEmailToUser == null) || (sEmailToUser.length() == 0))
{
throw new ID3Exception("Email address is required in POPM frame.");
}
m_sEmailToUser = sEmailToUser;
if ((iPopularity < 0) || (iPopularity > 255))
{
throw new ID3Exception("Popularity must be between 0 and 255 in POPM frame.");
}
m_iPopularity = iPopularity;
if (iPlayCount < 0)
{
throw new ID3Exception("Play count cannot be negative in POPM frame.");
}
m_iPlayCount = iPlayCount;
}
/** Creates a new instance of POPMID3V2Frame, not specifying the play count value.
*
* @param sEmailToUser the email address of the user to be informed of this track's popularity
* @param iPopularity the popularity rating of this track (1=worst, 255=best, 0=unknown)
* @throws ID3Exception if sEmailToUser not provided, or if either iPopularity or iPlayCount values are out of range
*/
public POPMID3V2Frame(String sEmailToUser, int iPopularity)
throws ID3Exception
{
if ((sEmailToUser == null) || (sEmailToUser.length() == 0))
{
throw new ID3Exception("Email address is required in POPM frame.");
}
m_sEmailToUser = sEmailToUser;
if ((iPopularity < 0) || (iPopularity > 255))
{
throw new ID3Exception("Popularity must be between 0 and 255 in POPM frame.");
}
m_iPopularity = iPopularity;
m_iPlayCount = -1;
}
public POPMID3V2Frame(InputStream oIS)
throws ID3Exception
{
try
{
ID3DataInputStream oFrameDataID3DIS = new ID3DataInputStream(oIS);
// email to user
m_sEmailToUser = oFrameDataID3DIS.readStringToNull();
// popularity
m_iPopularity = oFrameDataID3DIS.readUnsignedByte();
// play count (optional)
if (oFrameDataID3DIS.available() > 0)
{
if (oFrameDataID3DIS.available() == 4)
{
m_iPlayCount = oFrameDataID3DIS.readBE32();
}
else
{
// overflow (seriously, this will never _really_ happen...)
m_iPlayCount = Integer.MAX_VALUE;
}
}
else
{
// no play count
m_iPlayCount = -1;
}
}
catch (Exception e)
{
throw new InvalidFrameID3Exception(e);
}
}
public void accept(ID3Visitor oID3Visitor)
{
oID3Visitor.visitPOPMID3V2Frame(this);
}
/** Set the popularity values for this frame.
*
* @param sEmailToUser the email address of the user to be informed of this track's popularity
* @param iPopularity the popularity rating of this track (1=worst, 255=best, 0=unknown)
* @param iPlayCount the current playcount of this file (must be positive)
* @throws ID3Exception if sEmailToUser not provided, or if either iPopularity or iPlayCount values are out of range
* @throws ID3Exception if this frame is in a tag with another POPM frame which would have the same email address
*/
public void setPopularity(String sEmailToUser, int iPopularity, int iPlayCount)
throws ID3Exception
{
String sOrigEmailToUser = m_sEmailToUser;
int iOrigPopularity = m_iPopularity;
int iOrigPlayCount = m_iPlayCount;
if ((sEmailToUser == null) || (sEmailToUser.length() == 0))
{
throw new ID3Exception("Email address is required in POPM frame.");
}
if ((iPopularity < 0) || (iPopularity > 255))
{
throw new ID3Exception("Popularity must be between 0 and 255 in POPM frame.");
}
if (iPlayCount < 0)
{
throw new ID3Exception("Play count cannot be negative in POPM frame.");
}
m_sEmailToUser = sEmailToUser;
m_iPopularity = iPopularity;
m_iPlayCount = iPlayCount;
// try this update, and reverse it if it generates and error
try
{
notifyID3Observers();
}
catch (ID3Exception e)
{
m_sEmailToUser = sOrigEmailToUser;
m_iPopularity = iOrigPopularity;
m_iPlayCount = iOrigPlayCount;
throw e;
}
}
/** Set the popularity values for this frame, not specifying a play count value.
*
* @param sEmailToUser the email address of the user to be informed of this track's popularity
* @param iPopularity the popularity rating of this track (1=worst, 255=best, 0=unknown)
* @throws ID3Exception if sEmailToUser not provided, or if either iPopularity or iPlayCount values are out of range
* @throws ID3Exception if this frame is in a tag with another AENC frame which would have the same email address
*/
public void setPopularity(String sEmailToUser, int iPopularity)
throws ID3Exception
{
String sOrigEmailToUser = m_sEmailToUser;
int iOrigPopularity = m_iPopularity;
int iOrigPlayCount = m_iPlayCount;
if ((sEmailToUser == null) || (sEmailToUser.length() == 0))
{
throw new ID3Exception("Email address is required in POPM frame.");
}
if ((iPopularity < 0) || (iPopularity > 255))
{
throw new ID3Exception("Popularity must be between 0 and 255 in POPM frame.");
}
m_sEmailToUser = sEmailToUser;
m_iPopularity = iPopularity;
m_iPlayCount = -1;
// try this update, and reverse it if it generates and error
try
{
notifyID3Observers();
}
catch (ID3Exception e)
{
m_sEmailToUser = sOrigEmailToUser;
m_iPopularity = iOrigPopularity;
m_iPlayCount = iOrigPlayCount;
throw e;
}
}
/** Get the email address of the user to be informed about the popularity of this track.
*
* @return the email address of the user
*/
public String getEmailToUser()
{
return m_sEmailToUser;
}
/** Get the popularity rating of this track (1=worst, 255=best, 0=unknown)
*
* @return the popularity of this track
*/
public int getPopularity()
{
return m_iPopularity;
}
/** Get the play count value for this track.
*
* @return the play count for this track (-1 = not specified)
*/
public int getPlayCount()
{
return m_iPlayCount;
}
protected byte[] getFrameId()
{
return "POPM".getBytes();
}
public String toString()
{
return "Popularimeter: Email To User=[" + m_sEmailToUser + "], Popularity=" + m_iPopularity +
"], Play Count=[" + m_iPlayCount + "]";
}
protected void writeBody(ID3DataOutputStream oIDOS)
throws IOException
{
// email address plus null
oIDOS.write(m_sEmailToUser.getBytes());
oIDOS.write(0);
// popularity
oIDOS.write(m_iPopularity);
// play count
if (m_iPlayCount >= 0)
{
oIDOS.writeBE32(m_iPlayCount);
}
}
public boolean equals(Object oOther)
{
if ((oOther == null) || (!(oOther instanceof POPMID3V2Frame)))
{
return false;
}
POPMID3V2Frame oOtherPOPM = (POPMID3V2Frame)oOther;
return (m_sEmailToUser.equals(oOtherPOPM.m_sEmailToUser) &&
(m_iPopularity == oOtherPOPM.m_iPopularity) &&
(m_iPlayCount == oOtherPOPM.m_iPlayCount));
}
}
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