Package org.apache.poi.ss.formula.functions

Class Lookup

java.lang.Object

org.apache.poi.ss.formula.functions.Lookup

All Implemented Interfaces:

Function, Function2Arg, Function3Arg

public final class Lookup
extends Object

Implementation of Excel function LOOKUP.

LOOKUP finds an index row in a lookup table by the first column value and returns the value from another column. Syntax:
VLOOKUP(lookup_value, lookup_vector, result_vector)

lookup_value The value to be found in the lookup vector.
lookup_vector An area reference for the lookup data.
result_vector Single row or single column area reference from which the result value is chosen.

Constructor Summary

Constructors

Constructor	Description
Lookup()

Method Summary

Modifier and Type	Method	Description
ValueEval	evaluate(int srcRowIndex, int srcColumnIndex, ValueEval arg0, ValueEval arg1)	see Function.evaluate(ValueEval[], int, int)
ValueEval	evaluate(int srcRowIndex, int srcColumnIndex, ValueEval arg0, ValueEval arg1, ValueEval arg2)	see Function.evaluate(ValueEval[], int, int)
ValueEval	evaluate(ValueEval[] args, int srcRowIndex, int srcColumnIndex)

Methods inherited from class java.lang.Object

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

Constructor Detail

Lookup

public Lookup()

Method Detail

evaluate

public ValueEval evaluate(int srcRowIndex,
                          int srcColumnIndex,
                          ValueEval arg0,
                          ValueEval arg1)

Description copied from interface: Function2Arg

see Function.evaluate(ValueEval[], int, int)

evaluate

public ValueEval evaluate(int srcRowIndex,
                          int srcColumnIndex,
                          ValueEval arg0,
                          ValueEval arg1,
                          ValueEval arg2)

Description copied from interface: Function3Arg

see Function.evaluate(ValueEval[], int, int)

evaluate

public final ValueEval evaluate(ValueEval[] args,
                                int srcRowIndex,
                                int srcColumnIndex)

Specified by:

evaluate in interface Function

Parameters:

args - the evaluated function arguments. Empty values are represented with BlankEval or MissingArgEval, never null.

srcRowIndex - row index of the cell containing the formula under evaluation

srcColumnIndex - column index of the cell containing the formula under evaluation

Returns:

The evaluated result, possibly an ErrorEval, never null. Note - Excel uses the error code #NUM! instead of IEEE NaN, so when numeric functions evaluate to Double.NaN be sure to translate the result to ErrorEval.NUM_ERROR.