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The Apache Commons Codec package contains simple encoder and decoders for
various formats such as Base64 and Hexadecimal. In addition to these
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/* ====================================================================
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this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
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package org.apache.poi.ss.formula.functions;
import org.apache.poi.ss.formula.TwoDEval;
import org.apache.poi.ss.formula.eval.BlankEval;
import org.apache.poi.ss.formula.eval.ErrorEval;
import org.apache.poi.ss.formula.eval.EvaluationException;
import org.apache.poi.ss.formula.eval.MissingArgEval;
import org.apache.poi.ss.formula.eval.NumberEval;
import org.apache.poi.ss.formula.eval.NumericValueEval;
import org.apache.poi.ss.formula.eval.OperandResolver;
import org.apache.poi.ss.formula.eval.RefEval;
import org.apache.poi.ss.formula.eval.StringEval;
import org.apache.poi.ss.formula.eval.ValueEval;
import org.apache.poi.ss.formula.functions.LookupUtils.CompareResult;
import org.apache.poi.ss.formula.functions.LookupUtils.LookupValueComparer;
import org.apache.poi.ss.formula.functions.LookupUtils.ValueVector;
/**
* Implementation for the MATCH() Excel function.
*
* Syntax:
* MATCH(lookup_value, lookup_array, match_type)
*
* Returns a 1-based index specifying at what position in the lookup_array the specified
* lookup_value is found.
*
* Specific matching behaviour can be modified with the optional match_type parameter.
*
*
* Value Matching Behaviour 1 (default) find the largest value that is less than or equal to lookup_value.
* The lookup_array must be in ascending order*. 0 find the first value that is exactly equal to lookup_value.
* The lookup_array can be in any order. -1 find the smallest value that is greater than or equal to lookup_value.
* The lookup_array must be in descending order*.
*
* * Note regarding order - For the match_type cases that require the lookup_array to
* be ordered, MATCH() can produce incorrect results if this requirement is not met. Observed
* behaviour in Excel is to return the lowest index value for which every item after that index
* breaks the match rule.
* The (ascending) sort order expected by MATCH() is:
* numbers (low to high), strings (A to Z), boolean (FALSE to TRUE)
* MATCH() ignores all elements in the lookup_array with a different type to the lookup_value.
* Type conversion of the lookup_array elements is never performed.
*/
public final class Match extends Var2or3ArgFunction {
public ValueEval evaluate(int srcRowIndex, int srcColumnIndex, ValueEval arg0, ValueEval arg1) {
// default match_type is 1.0
return eval(srcRowIndex, srcColumnIndex, arg0, arg1, 1.0);
}
public ValueEval evaluate(int srcRowIndex, int srcColumnIndex, ValueEval arg0, ValueEval arg1,
ValueEval arg2) {
double match_type;
try {
match_type = evaluateMatchTypeArg(arg2, srcRowIndex, srcColumnIndex);
} catch (EvaluationException e) {
// Excel/MATCH() seems to have slightly abnormal handling of errors with
// the last parameter. Errors do not propagate up. Every error gets
// translated into #REF!
return ErrorEval.REF_INVALID;
}
return eval(srcRowIndex, srcColumnIndex, arg0, arg1, match_type);
}
private static ValueEval eval(int srcRowIndex, int srcColumnIndex, ValueEval arg0, ValueEval arg1,
double match_type) {
boolean matchExact = match_type == 0;
// Note - Excel does not strictly require -1 and +1
boolean findLargestLessThanOrEqual = match_type > 0;
try {
ValueEval lookupValue = OperandResolver.getSingleValue(arg0, srcRowIndex, srcColumnIndex);
ValueVector lookupRange = evaluateLookupRange(arg1);
int index = findIndexOfValue(lookupValue, lookupRange, matchExact, findLargestLessThanOrEqual);
return new NumberEval(index + 1.); // +1 to convert to 1-based
} catch (EvaluationException e) {
return e.getErrorEval();
}
}
private static final class SingleValueVector implements ValueVector {
private final ValueEval _value;
public SingleValueVector(ValueEval value) {
_value = value;
}
public ValueEval getItem(int index) {
if (index != 0) {
throw new RuntimeException("Invalid index ("
+ index + ") only zero is allowed");
}
return _value;
}
public int getSize() {
return 1;
}
}
private static ValueVector evaluateLookupRange(ValueEval eval) throws EvaluationException {
if (eval instanceof RefEval) {
RefEval re = (RefEval) eval;
if (re.getNumberOfSheets() == 1) {
return new SingleValueVector(re.getInnerValueEval(re.getFirstSheetIndex()));
} else {
return LookupUtils.createVector(re);
}
}
if (eval instanceof TwoDEval) {
ValueVector result = LookupUtils.createVector((TwoDEval)eval);
if (result == null) {
throw new EvaluationException(ErrorEval.NA);
}
return result;
}
// Error handling for lookup_range arg is also unusual
if(eval instanceof NumericValueEval) {
throw new EvaluationException(ErrorEval.NA);
}
if (eval instanceof StringEval) {
StringEval se = (StringEval) eval;
Double d = OperandResolver.parseDouble(se.getStringValue());
if(d == null) {
// plain string
throw new EvaluationException(ErrorEval.VALUE_INVALID);
}
// else looks like a number
throw new EvaluationException(ErrorEval.NA);
}
throw new RuntimeException("Unexpected eval type (" + eval + ")");
}
private static double evaluateMatchTypeArg(ValueEval arg, int srcCellRow, int srcCellCol)
throws EvaluationException {
ValueEval match_type = OperandResolver.getSingleValue(arg, srcCellRow, srcCellCol);
if(match_type instanceof ErrorEval) {
throw new EvaluationException((ErrorEval)match_type);
}
if(match_type instanceof NumericValueEval) {
NumericValueEval ne = (NumericValueEval) match_type;
return ne.getNumberValue();
}
if (match_type instanceof StringEval) {
StringEval se = (StringEval) match_type;
Double d = OperandResolver.parseDouble(se.getStringValue());
if(d == null) {
// plain string
throw new EvaluationException(ErrorEval.VALUE_INVALID);
}
// if the string parses as a number, it is OK
return d;
}
if (match_type instanceof MissingArgEval || match_type instanceof BlankEval) {
// Excel-Online ignores a missing match-type and
// uses the default-value instead
return 1;
}
throw new RuntimeException("Unexpected match_type type (" + match_type.getClass().getName() + ")");
}
/**
* @return zero based index
*/
private static int findIndexOfValue(ValueEval lookupValue, ValueVector lookupRange,
boolean matchExact, boolean findLargestLessThanOrEqual) throws EvaluationException {
LookupValueComparer lookupComparer = createLookupComparer(lookupValue, matchExact);
int size = lookupRange.getSize();
if(matchExact) {
for (int i = 0; i < size; i++) {
if(lookupComparer.compareTo(lookupRange.getItem(i)).isEqual()) {
return i;
}
}
throw new EvaluationException(ErrorEval.NA);
}
if(findLargestLessThanOrEqual) {
// Note - backward iteration
for (int i = size - 1; i>=0; i--) {
CompareResult cmp = lookupComparer.compareTo(lookupRange.getItem(i));
if(cmp.isTypeMismatch()) {
continue;
}
if(!cmp.isLessThan()) {
return i;
}
}
throw new EvaluationException(ErrorEval.NA);
}
// else - find smallest greater than or equal to
// TODO - is binary search used for (match_type==+1) ?
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