org.apache.poi.ss.formula.functions.Hlookup Maven / Gradle / Ivy
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package org.apache.poi.ss.formula.functions;
import org.apache.poi.ss.formula.eval.BoolEval;
import org.apache.poi.ss.formula.eval.EvaluationException;
import org.apache.poi.ss.formula.eval.OperandResolver;
import org.apache.poi.ss.formula.eval.ValueEval;
import org.apache.poi.ss.formula.functions.LookupUtils.ValueVector;
import org.apache.poi.ss.formula.TwoDEval;
/**
* Implementation of the HLOOKUP() function.
*
* HLOOKUP finds a column in a lookup table by the first row value and returns the value from another row.
*
* Syntax:
* HLOOKUP(lookup_value, table_array, row_index_num, range_lookup)
*
* lookup_value The value to be found in the first column of the table array.
* table_array An area reference for the lookup data.
* row_index_num a 1 based index specifying which row value of the lookup data will be returned.
* range_lookup If TRUE (default), HLOOKUP finds the largest value less than or equal to
* the lookup_value. If FALSE, only exact matches will be considered
*/
public final class Hlookup extends Var3or4ArgFunction {
private static final ValueEval DEFAULT_ARG3 = BoolEval.TRUE;
@Override
public ValueEval evaluate(int srcRowIndex, int srcColumnIndex, ValueEval arg0, ValueEval arg1,
ValueEval arg2) {
return evaluate(srcRowIndex, srcColumnIndex, arg0, arg1, arg2, DEFAULT_ARG3);
}
@Override
public ValueEval evaluate(int srcRowIndex, int srcColumnIndex, ValueEval arg0, ValueEval arg1,
ValueEval arg2, ValueEval arg3) {
try {
// Evaluation order:
// arg0 lookup_value, arg1 table_array, arg3 range_lookup, find lookup value, arg2 row_index, fetch result
ValueEval lookupValue = OperandResolver.getSingleValue(arg0, srcRowIndex, srcColumnIndex);
TwoDEval tableArray = LookupUtils.resolveTableArrayArg(arg1);
boolean isRangeLookup = LookupUtils.resolveRangeLookupArg(arg3, srcRowIndex, srcColumnIndex);
int colIndex = LookupUtils.lookupFirstIndexOfValue(lookupValue, LookupUtils.createRowVector(tableArray, 0), isRangeLookup);
int rowIndex = LookupUtils.resolveRowOrColIndexArg(arg2, srcRowIndex, srcColumnIndex);
ValueVector resultCol = createResultColumnVector(tableArray, rowIndex);
return resultCol.getItem(colIndex);
} catch (EvaluationException e) {
return e.getErrorEval();
}
}
/**
* Returns one column from an {@code AreaEval}
*
* @param rowIndex assumed to be non-negative
*
* @throws EvaluationException (#REF!) if colIndex is too high
*/
private ValueVector createResultColumnVector(TwoDEval tableArray, int rowIndex) throws EvaluationException {
if(rowIndex >= tableArray.getHeight()) {
throw EvaluationException.invalidRef();
}
return LookupUtils.createRowVector(tableArray, rowIndex);
}
}