public DrawingData() 
{
      
    numDrawings = 0;
    drawingData = null;
    initialized = false;
}

Constructor

 public  void addData(byte[] data) 
{
    addRawData(data);
    numDrawings++;
}

Adds the byte stream to the drawing data

 public  void addRawData(byte[] data) 
{
    if (drawingData == null)
    {
      drawingData = data;
      return;
    }
    // Resize the array
    byte[] newArray = new byte[drawingData.length + data.length];
    System.arraycopy(drawingData, 0, newArray, 0, drawingData.length);
    System.arraycopy(data, 0, newArray, drawingData.length, data.length);
    drawingData = newArray;
    // Dirty up this object
    initialized = false;
}

Adds the data to the array without incrementing the drawing number. This is used by comments, which for some bizarre and inexplicable reason split out the data

 public byte[] getData() 
{
    return drawingData;
}

Gets the data which was read in for the drawings

 final int getNumDrawings() 
{
    return numDrawings;
}

Accessor for the number of drawings

 EscherContainer getSpContainer(int drawingNum) 
{
    if (!initialized)
    {
      initialize();
    }
    if ( (drawingNum + 1)  >= spContainers.length)
    {
      throw new DrawingDataException();
    }
    EscherContainer spContainer =
      (EscherContainer) spContainers[drawingNum + 1];
    Assert.verify(spContainer != null);
    return spContainer;
}

Gets the sp container for the specified drawing number