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;
}
public synchronized void readBandData(
Band destBand,
int sourceOffsetX,
int sourceOffsetY,
int sourceWidth,
int sourceHeight,
int sourceStepX,
int sourceStepY,
ProductData destBuffer,
ProgressMonitor pm)
throws IOException, InvalidRangeException {
if (mustFlipY) {
sourceOffsetY = destBand.getSceneRasterHeight() - (sourceOffsetY + sourceHeight);
}
if (mustFlipX) {
sourceOffsetX = destBand.getSceneRasterWidth() - (sourceOffsetX + sourceWidth);
}
sourceOffsetY += leadLineSkip;
start[0] = sourceOffsetY;
start[1] = sourceOffsetX;
stride[0] = sourceStepY;
stride[1] = sourceStepX;
count[0] = sourceHeight;
count[1] = sourceWidth;
Object buffer = destBuffer.getElems();
Variable variable = variableMap.get(destBand);
pm.beginTask("Reading band '" + variable.getShortName() + "'...", sourceHeight);
try {
Section section = new Section(start, count, stride);
Array array;
int[] newshape = {sourceHeight, sourceWidth};
array = variable.read(section);
if (array.getRank() == 3) {
array = array.reshapeNoCopy(newshape);
}
Object storage;
if (mustFlipX && !mustFlipY) {
storage = array.flip(1).copyTo1DJavaArray();
} else if (!mustFlipX && mustFlipY) {
storage = array.flip(0).copyTo1DJavaArray();
} else if (mustFlipX && mustFlipY) {
storage = array.flip(0).flip(1).copyTo1DJavaArray();
} else {
storage = array.copyTo1DJavaArray();
}
arraycopy(storage, 0, buffer, 0, destBuffer.getNumElems());
} finally {
pm.done();
}
}
/**
* 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");
}
}
private void checkBufferSize(int sourceWidth, int sourceHeight, ProductData sourceBuffer) {
int expectedBufferSize = sourceWidth * sourceHeight;
int actualBufferSize = sourceBuffer.getNumElems();
Guardian.assertEquals("wrong sourceBuffer size", actualBufferSize, expectedBufferSize);
}
