/*

  * 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.generic.Utils;

 import org.jaudiotagger.audio.mp4.atom.Mp4BoxHeader;

 import org.jaudiotagger.tag.TagField;

 import org.jaudiotagger.tag.mp4.atom.Mp4DataBox;

 import java.io.ByteArrayOutputStream;

 import java.io.IOException;

 import java.io.UnsupportedEncodingException;

 import java.nio.ByteBuffer;

 import java.util.List;

 /**

  * Represents simple text field that contains an array of number,

  * <p/>

  * <p>But reads the data content as an array of 16 bit unsigned numbers

  */

 public class Mp4TagTextNumberField extends Mp4TagTextField

 {

     public static final int NUMBER_LENGTH = 2;

     //Holds the numbers decoded

     protected List<Short> numbers;

     /**

      * Create a new number, already parsed in subclasses

      *

      * @param id

      * @param numberArray

      */

     public Mp4TagTextNumberField(String id, String numberArray)

     {

         super(id, numberArray);

     }

     public Mp4TagTextNumberField(String id, ByteBuffer data) throws UnsupportedEncodingException

     {

         super(id, data);

     }

     /**

      * Recreate the raw data content from the list of numbers

      *

      * @return

      */

     protected byte[] getDataBytes()

     {

         ByteArrayOutputStream baos = new ByteArrayOutputStream();

         for (Short number : numbers)

         {

             try

             {

                 baos.write(Utils.getSizeBEInt16(number));

             }

             catch (IOException e)

             {

                 //This should never happen because we are not writing to file at this point.

                 throw new RuntimeException(e);

             }

         }

         return baos.toByteArray();

     }

     public void copyContent(TagField field)

     {

         if (field instanceof Mp4TagTextNumberField)

         {

             this.content = ((Mp4TagTextNumberField) field).getContent();

             this.numbers = ((Mp4TagTextNumberField) field).getNumbers();

         }

     }

     /**

      * @return type numeric

      */

     public Mp4FieldType getFieldType()

     {

         return Mp4FieldType.IMPLICIT;

     }

     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();

         numbers = databox.getNumbers();

     }

     /**

      * @return the individual numbers making up this field

      */

     public List<Short> getNumbers()

     {

         return numbers;

     }

 }