// Reused by both MR and Spark for performing zero out
public static IndexRange getSelectedRangeForZeroOut(
IndexedMatrixValue in, int blockRowFactor, int blockColFactor, IndexRange indexRange) {
IndexRange tempRange = new IndexRange(-1, -1, -1, -1);
long topBlockRowIndex = UtilFunctions.computeBlockIndex(indexRange.rowStart, blockRowFactor);
int topRowInTopBlock = UtilFunctions.computeCellInBlock(indexRange.rowStart, blockRowFactor);
long bottomBlockRowIndex = UtilFunctions.computeBlockIndex(indexRange.rowEnd, blockRowFactor);
int bottomRowInBottomBlock =
UtilFunctions.computeCellInBlock(indexRange.rowEnd, blockRowFactor);
long leftBlockColIndex = UtilFunctions.computeBlockIndex(indexRange.colStart, blockColFactor);
int leftColInLeftBlock = UtilFunctions.computeCellInBlock(indexRange.colStart, blockColFactor);
long rightBlockColIndex = UtilFunctions.computeBlockIndex(indexRange.colEnd, blockColFactor);
int rightColInRightBlock = UtilFunctions.computeCellInBlock(indexRange.colEnd, blockColFactor);
// no overlap
if (in.getIndexes().getRowIndex() < topBlockRowIndex
|| in.getIndexes().getRowIndex() > bottomBlockRowIndex
|| in.getIndexes().getColumnIndex() < leftBlockColIndex
|| in.getIndexes().getColumnIndex() > rightBlockColIndex) {
tempRange.set(-1, -1, -1, -1);
return tempRange;
}
// get the index range inside the block
tempRange.set(0, in.getValue().getNumRows() - 1, 0, in.getValue().getNumColumns() - 1);
if (topBlockRowIndex == in.getIndexes().getRowIndex()) tempRange.rowStart = topRowInTopBlock;
if (bottomBlockRowIndex == in.getIndexes().getRowIndex())
tempRange.rowEnd = bottomRowInBottomBlock;
if (leftBlockColIndex == in.getIndexes().getColumnIndex())
tempRange.colStart = leftColInLeftBlock;
if (rightBlockColIndex == in.getIndexes().getColumnIndex())
tempRange.colEnd = rightColInRightBlock;
return tempRange;
}
