private void readBandRasterDataSubSampling(
Band sourceBand,
int sourceOffsetX,
int sourceOffsetY,
int sourceWidth,
int sourceHeight,
int sourceStepX,
int sourceStepY,
ProductData destBuffer,
int destWidth,
ProgressMonitor pm)
throws IOException {
final int sourceMinY = sourceOffsetY;
final int sourceMaxY = sourceOffsetY + sourceHeight - 1;
ProductData lineBuffer = ProductData.createInstance(destBuffer.getType(), sourceWidth);
int destPos = 0;
try {
pm.beginTask("Reading sub sampled raster data...", 2 * (sourceMaxY - sourceMinY));
for (int sourceY = sourceMinY; sourceY <= sourceMaxY; sourceY += sourceStepY) {
sourceBand.readRasterData(
sourceOffsetX, sourceY, sourceWidth, 1, lineBuffer, SubProgressMonitor.create(pm, 1));
if (sourceStepX == 1) {
copyData(lineBuffer, 0, destBuffer, destPos, destWidth);
} else {
copyLine(lineBuffer, 0, sourceWidth, sourceStepX, destBuffer, destPos);
}
pm.worked(1);
destPos += destWidth;
}
} finally {
pm.done();
}
}
public DataNode(String name, ProductData data, boolean readOnly) {
super(name);
Guardian.assertNotNull("data", data);
this.dataType = data.getType();
this.numElems = data.getNumElems();
this.data = data;
this.readOnly = readOnly;
}
/**
* Checks if the data that should be used to access the data is compatible with the data this node
* can hold.
*
* @param data the data to be checked for compatibility
* @throws IllegalArgumentException if data is invalid.
*/
protected void checkDataCompatibility(ProductData data) throws IllegalArgumentException {
Debug.assertNotNull(data);
if (data.getType() != getDataType()) {
throw new IllegalArgumentException(
"illegal data for data node '"
+ getName()
+ "', type "
+ ProductData.getTypeString(getDataType())
+ " expected");
}
if (data.getNumElems() != getNumDataElems()) {
throw new IllegalArgumentException(
"illegal number of data elements for data node '"
+ getName()
+ "', "
+ getNumDataElems()
+ " elements expected");
}
}
/** {@inheritDoc} */
public void writeBandRasterData(
Band sourceBand,
int sourceOffsetX,
int sourceOffsetY,
int sourceWidth,
int sourceHeight,
ProductData sourceBuffer,
ProgressMonitor pm)
throws IOException {
checkBufferSize(sourceWidth, sourceHeight, sourceBuffer);
final int sourceBandWidth = sourceBand.getSceneRasterWidth();
final int sourceBandHeight = sourceBand.getSceneRasterHeight();
checkSourceRegionInsideBandRegion(
sourceWidth, sourceBandWidth, sourceHeight, sourceBandHeight, sourceOffsetX, sourceOffsetY);
int memTypeID = -1;
int memSpaceID = -1;
pm.beginTask("Writing band '" + sourceBand.getName() + "'...", 1);
try {
final int datasetID = getOrCreateBandH5D(sourceBand);
final int fileSpaceID = H5.H5Dget_space(datasetID);
final long[] memDims = new long[] {sourceHeight, sourceWidth};
final long[] memStart = new long[2];
final long[] memCount = new long[2];
final long[] fileStart = new long[2];
final long[] fileCount = new long[2];
memTypeID = createH5TypeID(sourceBuffer.getType());
memSpaceID = H5.H5Screate_simple(2, memDims, null);
memStart[0] = 0;
memStart[1] = 0;
memCount[0] = sourceHeight;
memCount[1] = sourceWidth;
H5.H5Sselect_hyperslab(
memSpaceID, HDF5Constants.H5S_SELECT_SET, memStart, null, memCount, null);
fileStart[0] = sourceOffsetY;
fileStart[1] = sourceOffsetX;
fileCount[0] = sourceHeight;
fileCount[1] = sourceWidth;
H5.H5Sselect_hyperslab(
fileSpaceID, HDF5Constants.H5S_SELECT_SET, fileStart, null, fileCount, null);
H5.H5Dwrite(
datasetID,
memTypeID,
memSpaceID,
fileSpaceID,
HDF5Constants.H5P_DEFAULT,
sourceBuffer.getElems());
pm.worked(1);
} catch (IOException e) {
throw e;
} catch (HDF5Exception e) {
throw new ProductIOException(createErrorMessage(e));
} finally {
closeH5S(memSpaceID);
closeH5T(memTypeID);
pm.done();
}
}