Package ucar.nc2.iosp

Interface LayoutBB

All Superinterfaces:
Layout
All Known Implementing Classes:
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 Summary

    Modifier and Type
    Method
    Description
    int
    getElemSize()
    Get size of each element in bytes.
    long
    getTotalNelems()
    Get total number of elements in the wanted subset.
    boolean
    hasNext()
    Is there more to do
    LayoutBB.Chunk
    next()
    Get the next chunk

  • Method Details

    • 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()