org.deegree.coverage.raster.io.grid
Class SplittedBlobReader

java.lang.Object
  org.deegree.coverage.raster.io.grid.GridReader
      org.deegree.coverage.raster.io.grid.GridFileReader
          org.deegree.coverage.raster.io.grid.SplittedBlobReader

All Implemented Interfaces:

RasterReader

public class SplittedBlobReader
extends GridFileReader

The SplittedBlobReader is a rasterreader for a grid file which is spread over multiple blobs. The blobs are organised as follows: Each blob will hold the so much rows until a given file size is reached, the next blob will hold the next tile in the same row and will then add rows etc. In other words the grid looks like this:

rows: 5 cols: 5 filesize: 7*tilesize.

• file:blob_0.bin [(0,0)(0,1)(0,2)(0,3)(0,4)(1,0)(1,1)]
• file:blob_1.bin [(1,2)(1,3)(1,4),(2,0)(2,1)(2,2)(2,3)]
• ...

the last file might be partially empty. Each tile will be saved flat row first (rb, please check this): pixel(0,0)(0,1)(0,2)(0,3)(0,4)(0,5)(0,6)(0,7)(1,0)(1,1)(1,2)(1,3)(1,4)(1,5)(1,6)(1,7)

Version:

$Revision: 31644 $, $Date: 2011-08-24 22:27:43 +0200 (Wed, 24 Aug 2011) $

Author:

Rutger Bezema, last edited by: $Author: mschneider $

Field Summary

Fields inherited from class org.deegree.coverage.raster.io.grid.GridReader

infoFile, sampleSize

Constructor Summary

SplittedBlobReader(File blobDir, String blobFilename, String blobFileext, GridMetaInfoFile infoFile)
Creates a blob reader for a grid file which is spread over multiple blobs.

Method Summary

boolean	canLoad(File filename) Check if the raster reader is able to read the given raster file.
protected void	read(int columnId, int rowId, ByteBuffer buffer) Reads the data from the grid.
BufferResult	read(RasterRect rect, ByteBuffer resultBuffer)

Methods inherited from class org.deegree.coverage.raster.io.grid.GridFileReader

dispose, file, getDataLocationId, getSupportedFormats, instantiate, leaveStreamOpen, load, readValuesFromTile

Methods inherited from class org.deegree.coverage.raster.io.grid.GridReader

allocateTileBuffer, canReadTiles, getBytesPerTile, getEnvelope, getGeoReference, getHeight, getIntersectingTiles, getNumberOfTiles, getRasterDataInfo, getTile, getTileColumns, getTileData, getTileEnvelope, getTileId, getTileRasterHeight, getTileRasterWidth, getTileRows, getTilesPerBlob, getWidth, instantiate, load, setTilesPerBlob, shouldCreateCacheFile, snapToGrid

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SplittedBlobReader

public SplittedBlobReader(File blobDir,
                          String blobFilename,
                          String blobFileext,
                          GridMetaInfoFile infoFile)

Creates a blob reader for a grid file which is spread over multiple blobs.

Parameters:

blobDir -

blobFilename -

blobFileext -

infoFile -

Method Detail

read

protected void read(int columnId,
                    int rowId,
                    ByteBuffer buffer)
             throws IOException

Description copied from class: GridReader

Reads the data from the grid.

Overrides:

read in class GridFileReader

Throws:

IOException

canLoad

public boolean canLoad(File filename)

Description copied from interface: RasterReader

Check if the raster reader is able to read the given raster file.

Specified by:

canLoad in interface RasterReader

Overrides:

canLoad in class GridFileReader

Returns:

true if the class can read the raster

read

public BufferResult read(RasterRect rect,
                         ByteBuffer resultBuffer)
                  throws IOException

Specified by:

read in interface RasterReader

Overrides:

read in class GridFileReader

Parameters:

rect - to read.

resultBuffer - to store the result in

Returns:

the read buffer and its domain

Throws:

IOException