Package ucar.nc2.iosp

Interface LayoutBB

  • All Superinterfaces:
    Layout
    All Known Implementing Classes:
    H5tiledLayoutBB, H5tiledLayoutBB, LayoutBBTiled
    public interface LayoutBB
extends Layout
    A Layout that supplies the "source" ByteBuffer. This is used when the data must be massaged after being read, eg uncompresed or filtered. The modified data is placed in a ByteBuffer, which may change for different chunks, and so is supplied by each chunk.

    Example for Integers: 

     
 int[] read(LayoutBB index, int[] pa) {
   while (index.hasNext()) {
     LayoutBB.Chunk chunk = index.next();
     IntBuffer buff = chunk.getIntBuffer();
     buff.position(chunk.getSrcElem());
     int pos = (int) chunk.getDestElem();
     for (int i = 0; i < chunk.getNelems(); i++)
       pa[pos++] = buff.get();
   }
   return pa;
 }
    Since:
    Jan 9, 2008

    • Nested Class Summary

      Nested Classes 
      Modifier and Type Interface Description
      static interface  LayoutBB.Chunk
      A chunk of data that is contiguous in both the source and destination.

    • Method Detail

      • getTotalNelems

        long getTotalNelems()
        Get total number of elements in the wanted subset.
        Specified by:
        getTotalNelems in interface Layout
        Returns:
        total number of elements in the wanted subset.

      • getElemSize

        int getElemSize()
        Get size of each element in bytes.
        Specified by:
        getElemSize in interface Layout
        Returns:
        size of each element in bytes.

      • hasNext

        boolean hasNext()
        Is there more to do
        Specified by:
        hasNext in interface Layout
        Returns:
        true if theres more to do

      • next

        LayoutBB.Chunk next()
        Get the next chunk
        Specified by:
        next in interface Layout
        Returns:
        next chunk, or null if !hasNext()