/*
* Entagged Audio Tag library
* Copyright (c) 2003-2005 Raphaël Slinckx <raphael@slinckx.net>
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
package org.jaudiotagger.tag.mp4.field;
import org.jaudiotagger.audio.mp4.atom.Mp4BoxHeader;
import org.jaudiotagger.tag.TagField;
import org.jaudiotagger.tag.TagTextField;
import org.jaudiotagger.tag.mp4.Mp4TagField;
import org.jaudiotagger.tag.mp4.atom.Mp4DataBox;
import java.io.UnsupportedEncodingException;
import java.nio.ByteBuffer;
/**
* Represents a single text field
* <p/>
* <p>Mp4 metadata normally held as follows:
* <pre>
* MP4Box Parent contains
* :length (includes length of data child) (4 bytes)
* :name (4 bytes)
* :child with
* :length (4 bytes)
* :name 'Data' (4 bytes)
* :atom version (1 byte)
* :atom type flags (3 bytes)
* :null field (4 bytes)
* :data
* </pre>
* <p/>
* <p>Note:This class is initilized with the child data atom only, the parent data has already been processed, this may
* change as it seems that code should probably be enscapulated into this. Whereas the raw content returned by the
* getRawContent() contais the byte data for parent and child.
*/
public class Mp4TagTextField extends Mp4TagField implements TagTextField {
protected int dataSize;
protected String content;
/**
* Construct from File
*
* @param id parent id
* @param data atom data
* @throws UnsupportedEncodingException
*/
public Mp4TagTextField(String id, ByteBuffer data) throws UnsupportedEncodingException {
super(id, data);
}
/**
* Construct new Field
*
* @param id parent id
* @param content data atom data
*/
public Mp4TagTextField(String id, String content) {
super(id);
this.content = content;
}
protected void build(ByteBuffer data) throws UnsupportedEncodingException {
//Data actually contains a 'Data' Box so process data using this
Mp4BoxHeader header = new Mp4BoxHeader(data);
Mp4DataBox databox = new Mp4DataBox(header, data);
dataSize = header.getDataLength();
content = databox.getContent();
}
public void copyContent(TagField field) {
if (field instanceof Mp4TagTextField) {
this.content = ((Mp4TagTextField) field).getContent();
}
}
public String getContent() {
return content;
}
protected byte[] getDataBytes() throws UnsupportedEncodingException {
return content.getBytes(getEncoding());
}
public Mp4FieldType getFieldType() {
return Mp4FieldType.TEXT;
}
public String getEncoding() {
return Mp4BoxHeader.CHARSET_UTF_8;
}
public boolean isBinary() {
return false;
}
public boolean isEmpty() {
return this.content.trim().equals("");
}
public void setContent(String s) {
this.content = s;
}
public void setEncoding(String s) {
/* Not allowed */
}
public String toString() {
return content;
}
}