/* ====================================================================
|
Licensed to the Apache Software Foundation (ASF) Under one or more
|
contributor license agreements. See the NOTICE file distributed with
|
this work for Additional information regarding copyright ownership.
|
The ASF licenses this file to You Under the Apache License, Version 2.0
|
(the "License"); you may not use this file except in compliance with
|
the License. You may obtain a copy of the License at
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
Unless required by applicable law or agreed to in writing, software
|
distributed Under the License is distributed on an "AS Is" BASIS,
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
See the License for the specific language governing permissions and
|
limitations Under the License.
|
==================================================================== */
|
|
namespace HH.WMS.Utils.NPOI.SS.Formula.Functions
|
{
|
using System;
|
using HH.WMS.Utils.NPOI.SS.Formula.Eval;
|
|
|
public class SimpleValueVector : ValueVector
|
{
|
private ValueEval[] _values;
|
|
public SimpleValueVector(ValueEval[] values)
|
{
|
_values = values;
|
}
|
public ValueEval GetItem(int index)
|
{
|
return _values[index];
|
}
|
public int Size
|
{
|
get
|
{
|
return _values.Length;
|
}
|
}
|
}
|
/**
|
* Implementation of Excel function LOOKUP.<p/>
|
*
|
* LOOKUP Finds an index row in a lookup table by the first column value and returns the value from another column.
|
*
|
* <b>Syntax</b>:<br/>
|
* <b>VLOOKUP</b>(<b>lookup_value</b>, <b>lookup_vector</b>, result_vector)<p/>
|
*
|
* <b>lookup_value</b> The value to be found in the lookup vector.<br/>
|
* <b>lookup_vector</b> An area reference for the lookup data. <br/>
|
* <b>result_vector</b> Single row or single column area reference from which the result value Is chosen.<br/>
|
*
|
* @author Josh Micich
|
*/
|
public class Lookup : Function
|
{
|
|
|
public ValueEval Evaluate(ValueEval[] args, int srcCellRow, int srcCellCol)
|
{
|
switch (args.Length)
|
{
|
case 3:
|
break;
|
case 2:
|
// complex rules to choose lookupVector and resultVector from the single area ref
|
throw new Exception("Two arg version of LOOKUP not supported yet");
|
default:
|
return ErrorEval.VALUE_INVALID;
|
}
|
|
|
try
|
{
|
ValueEval lookupValue = OperandResolver.GetSingleValue(args[0], srcCellRow, srcCellCol);
|
AreaEval aeLookupVector = LookupUtils.ResolveTableArrayArg(args[1]);
|
AreaEval aeResultVector = LookupUtils.ResolveTableArrayArg(args[2]);
|
|
ValueVector lookupVector = CreateVector(aeLookupVector);
|
ValueVector resultVector = CreateVector(aeResultVector);
|
if (lookupVector.Size > resultVector.Size)
|
{
|
// Excel seems to handle this by accessing past the end of the result vector.
|
throw new Exception("Lookup vector and result vector of differing sizes not supported yet");
|
}
|
int index = LookupUtils.LookupIndexOfValue(lookupValue, lookupVector, true);
|
|
return resultVector.GetItem(index);
|
}
|
catch (EvaluationException e)
|
{
|
return e.GetErrorEval();
|
}
|
}
|
|
private static ValueVector CreateVector(AreaEval ae)
|
{
|
ValueVector result = LookupUtils.CreateVector(ae);
|
if (result != null)
|
{
|
return result;
|
}
|
// extra complexity required to emulate the way LOOKUP can handles these abnormal cases.
|
throw new InvalidOperationException("non-vector lookup or result areas not supported yet");
|
}
|
}
|
}
|
