Package ucar.nc2.iosp

Interface Layout

All Known Subinterfaces:

LayoutBB

All Known Implementing Classes:

LayoutBBTiled, LayoutRegular, LayoutRegularSegmented, LayoutSegmented, LayoutTiled

public interface Layout

Iterator to read/write subsets of a multidimensional array, finding the contiguous chunks. The iteration is monotonic in both src and dest positions.

Example for Integers:

  int[] read( Layout index, int[] src) {
    int[] dest = new int[index.getTotalNelems()];
    while (index.hasNext()) {
      Layout.Chunk chunk = index.next();
      System.arraycopy(src, chunk.getSrcElem(), dest, chunk.getDestElem(), chunk.getNelems());
    }
    return dest;
  }

  int[] read( Layout index, RandomAccessFile raf) {
    int[] dest = new int[index.getTotalNelems()];
    while (index.hasNext()) {
      Layout.Chunk chunk = index.next();
      raf.seek( chunk.getSrcPos());
      raf.readInt(dest, chunk.getDestElem(), chunk.getNelems());
    }
    return dest;
  }

   // note src and dest misnamed
    void write( Layout index, int[] src, RandomAccessFile raf) {
      while (index.hasNext()) {
        Layout.Chunk chunk = index.next();
        raf.seek ( chunk.getSrcPos());
        for (int k=0; k<chunk.getNelems(); k++)
          raf.writeInt(src, chunk.getDestElem(), chunk.getNelems());
          raf.writeInt( ii.getByteNext());
      }
 
 

Since:

Jan 2, 2008

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static interface	Layout.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
Layout.Chunk	next()	Get the next chunk

Method Details

getTotalNelems

long getTotalNelems()

Get total number of elements in the wanted subset.

Returns:

total number of elements in the wanted subset.

getElemSize

int getElemSize()

Get size of each element in bytes.

Returns:

size of each element in bytes.

hasNext

boolean hasNext()

Is there more to do

Returns:

true if theres more to do

next

Layout.Chunk next()

Get the next chunk

Returns:

next chunk, or null if !hasNext()