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bug 52063: support 2-argument LOOKUP(lookup_value, array) function in Excel

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git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1799302 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Javen O'Neal 2017-06-20 05:47:56 +00:00
parent 2095c92402
commit 5de40d3261
2 changed files with 91 additions and 5 deletions
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33
src/java/org/apache/poi/ss/formula/functions/Lookup.java
View File

@ -39,11 +39,42 @@ import org.apache.poi.ss.formula.TwoDEval;
*/
public final class Lookup extends Var2or3ArgFunction {
@Override
public ValueEval evaluate(int srcRowIndex, int srcColumnIndex, ValueEval arg0, ValueEval arg1) {
// complex rules to choose lookupVector and resultVector from the single area ref
throw new RuntimeException("Two arg version of LOOKUP not supported yet");
try {
/*
The array form of LOOKUP is very similar to the HLOOKUP and VLOOKUP functions. The difference is that HLOOKUP searches for the value of lookup_value in the first row, VLOOKUP searches in the first column, and LOOKUP searches according to the dimensions of array.
If array covers an area that is wider than it is tall (more columns than rows), LOOKUP searches for the value of lookup_value in the first row.
If an array is square or is taller than it is wide (more rows than columns), LOOKUP searches in the first column.
With the HLOOKUP and VLOOKUP functions, you can index down or across, but LOOKUP always selects the last value in the row or column.
*/
ValueEval lookupValue = OperandResolver.getSingleValue(arg0, srcRowIndex, srcColumnIndex);
TwoDEval lookupArray = LookupUtils.resolveTableArrayArg(arg1);
ValueVector lookupVector;
ValueVector resultVector;
if (lookupArray.getWidth() > lookupArray.getHeight()) {
// If array covers an area that is wider than it is tall (more columns than rows), LOOKUP searches for the value of lookup_value in the first row.
lookupVector = createVector(lookupArray.getRow(0));
resultVector = createVector(lookupArray.getRow(lookupArray.getHeight() - 1));
} else {
// If an array is square or is taller than it is wide (more rows than columns), LOOKUP searches in the first column.
lookupVector = createVector(lookupArray.getColumn(0));
resultVector = createVector(lookupArray.getColumn(lookupArray.getWidth() - 1));
}
// if a rectangular area reference was passed in as arg1, lookupVector and resultVector should be the same size
assert (lookupVector.getSize() == resultVector.getSize());
int index = LookupUtils.lookupIndexOfValue(lookupValue, lookupVector, true);
return resultVector.getItem(index);
} catch (final EvaluationException e) {
return e.getErrorEval();
}
}
@Override
public ValueEval evaluate(int srcRowIndex, int srcColumnIndex, ValueEval arg0, ValueEval arg1,
ValueEval arg2) {
try {

57
src/testcases/org/apache/poi/ss/formula/eval/TestFormulaBugs.java
View File

@ -190,12 +190,67 @@ public final class TestFormulaBugs {
wb.close();
}
private void checkFormulaValue(Workbook wb, Cell cell, String formula, double expectedValue) {
// bug 52063: LOOKUP(2-arg) and LOOKUP(3-arg)
// FIXME: This could be moved into LookupFunctionsTestCaseData.xls, which is tested by TestLookupFunctionsFromSpreadsheet.java
@Test
public void testLookupFormula() throws Exception {
Workbook wb = new HSSFWorkbook();
Sheet sheet = wb.createSheet("52063");
// Note: Values in arrays are in ascending order since LOOKUP expects that in order to work properly
// column
// A B C
// +-------
// row 1 | P Q R
// row 2 | X Y Z
Row row = sheet.createRow(0);
row.createCell(0).setCellValue("P");
row.createCell(1).setCellValue("Q");
row.createCell(2).setCellValue("R");
row = sheet.createRow(1);
row.createCell(0).setCellValue("X");
row.createCell(1).setCellValue("Y");
row.createCell(2).setCellValue("Z");
Cell evalcell = sheet.createRow(2).createCell(0);
//// ROW VECTORS
// lookup and result row are the same
checkFormulaValue(wb, evalcell, "LOOKUP(\"Q\", A1:C1)", "Q");
checkFormulaValue(wb, evalcell, "LOOKUP(\"R\", A1:C1)", "R");
checkFormulaValue(wb, evalcell, "LOOKUP(\"Q\", A1:C1, A1:C1)", "Q");
checkFormulaValue(wb, evalcell, "LOOKUP(\"R\", A1:C1, A1:C1)", "R");
// lookup and result row are different
checkFormulaValue(wb, evalcell, "LOOKUP(\"Q\", A1:C2)", "Y");
checkFormulaValue(wb, evalcell, "LOOKUP(\"R\", A1:C2)", "Z");
checkFormulaValue(wb, evalcell, "LOOKUP(\"Q\", A1:C1, A2:C2)", "Y");
checkFormulaValue(wb, evalcell, "LOOKUP(\"R\", A1:C1, A2:C2)", "Z");
//// COLUMN VECTORS
// lookup and result column are different
checkFormulaValue(wb, evalcell, "LOOKUP(\"P\", A1:B2)", "Q");
checkFormulaValue(wb, evalcell, "LOOKUP(\"X\", A1:A2, C1:C2)", "Z");
wb.close();
}
private CellValue evaluateFormulaInCell(Workbook wb, Cell cell, String formula) {
cell.setCellFormula(formula);
FormulaEvaluator evaluator = wb.getCreationHelper().createFormulaEvaluator();
CellValue value = evaluator.evaluate(cell);
return value;
}
private void checkFormulaValue(Workbook wb, Cell cell, String formula, double expectedValue) {
CellValue value = evaluateFormulaInCell(wb, cell, formula);
assertEquals(expectedValue, value.getNumberValue(), 0.0001);
}
private void checkFormulaValue(Workbook wb, Cell cell, String formula, String expectedValue) {
CellValue value = evaluateFormulaInCell(wb, cell, formula);
assertEquals(expectedValue, value.getStringValue());
}
}