org.apache.poi.ss.formula.atp.TextJoinFunction Maven / Gradle / Ivy
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package org.apache.poi.ss.formula.atp;
import org.apache.poi.ss.formula.OperationEvaluationContext;
import org.apache.poi.ss.formula.eval.*;
import org.apache.poi.ss.formula.functions.FreeRefFunction;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
/**
* Implementation of Excel function TEXTJOIN()
*
* Syntax
* TEXTJOIN(delimiter, ignore_empty, text1, [text2], …)
*
* delimiter A text string, either empty, or one or more characters enclosed by double quotes, or a reference to a valid text string.
* If a number is supplied, it will be treated as text.
* ignore_empty If TRUE, ignores empty cells.
* text1 Text item to be joined. A text string, or array of strings, such as a range of cells.
* text2 ... Optional. Additional text items to be joined. There can be a maximum of 252 text arguments for the text items, including text1.
* Each can be a text string, or array of strings, such as a range of cells.
*
* @since POI 5.1.0
*/
final class TextJoinFunction implements FreeRefFunction {
public static final FreeRefFunction instance = new TextJoinFunction(ArgumentsEvaluator.instance);
private ArgumentsEvaluator evaluator;
private TextJoinFunction(ArgumentsEvaluator anEvaluator) {
// enforces singleton
this.evaluator = anEvaluator;
}
public ValueEval evaluate(ValueEval[] args, OperationEvaluationContext ec) {
/*
* Must be at least three arguments:
* - delimiter Delimiter for joining text arguments
* - ignoreEmpty If true, empty strings will be ignored in the join
* - text1 First value to be evaluated as text and joined
* - text2, etc. Optional additional values to be evaluated and joined
*/
// Make sure we have at least one text value, and at most 252 text values, as documented at:
// https://support.microsoft.com/en-us/office/textjoin-function-357b449a-ec91-49d0-80c3-0e8fc845691c?ui=en-us&rs=en-us&ad=us
if (args.length < 3 || args.length > 254) {
return ErrorEval.VALUE_INVALID;
}
int srcRowIndex = ec.getRowIndex();
int srcColumnIndex = ec.getColumnIndex();
try {
// Get the delimiter argument
List delimiterArgs = getValues(args[0], srcRowIndex, srcColumnIndex, true);
// Get the boolean ignoreEmpty argument
ValueEval ignoreEmptyArg = OperandResolver.getSingleValue(args[1], srcRowIndex, srcColumnIndex);
boolean ignoreEmpty = OperandResolver.coerceValueToBoolean(ignoreEmptyArg, false);
// Get a list of string values for each text argument
ArrayList textValues = new ArrayList<>();
for (int i = 2; i < args.length; i++) {
List textArgs = getValues(args[i], srcRowIndex, srcColumnIndex, false);
for (ValueEval textArg : textArgs) {
String textValue = OperandResolver.coerceValueToString(textArg);
// If we're not ignoring empty values or if our value is not empty, add it to the list
if (!ignoreEmpty || (textValue != null && textValue.length() > 0)) {
textValues.add(textValue);
}
}
}
// Join the list of values with the specified delimiter and return
if (delimiterArgs.size() == 0) {
return new StringEval(String.join("", textValues));
} else if (delimiterArgs.size() == 1) {
String delimiter = laxValueToString(delimiterArgs.get(0));
return new StringEval(String.join(delimiter, textValues));
} else {
//https://support.microsoft.com/en-us/office/textjoin-function-357b449a-ec91-49d0-80c3-0e8fc845691c
//see example 3 to see why this is needed
List delimiters = new ArrayList<>();
for (ValueEval delimiterArg: delimiterArgs) {
delimiters.add(laxValueToString(delimiterArg));
}
StringBuilder sb = new StringBuilder();
for (int i = 0; i < textValues.size(); i++) {
if (i > 0) {
int delimiterIndex = (i - 1) % delimiters.size();
sb.append(delimiters.get(delimiterIndex));
}
sb.append(textValues.get(i));
}
return new StringEval(sb.toString());
}
} catch (EvaluationException e){
return e.getErrorEval();
}
}
private String laxValueToString(ValueEval eval) {
return (eval instanceof MissingArgEval) ? "" : OperandResolver.coerceValueToString(eval);
}
//https://support.microsoft.com/en-us/office/textjoin-function-357b449a-ec91-49d0-80c3-0e8fc845691c
//in example 3, the delimiter is defined by a large area but only the last row of that area seems to be used
//this is why lastRowOnly is supported
private List getValues(ValueEval eval, int srcRowIndex, int srcColumnIndex,
boolean lastRowOnly) throws EvaluationException {
if (eval instanceof AreaEval) {
AreaEval ae = (AreaEval)eval;
List list = new ArrayList<>();
int startRow = lastRowOnly ? ae.getLastRow() : ae.getFirstRow();
for (int r = startRow; r <= ae.getLastRow(); r++) {
for (int c = ae.getFirstColumn(); c <= ae.getLastColumn(); c++) {
list.add(OperandResolver.getSingleValue(ae.getAbsoluteValue(r, c), r, c));
}
}
return list;
} else {
return Collections.singletonList(OperandResolver.getSingleValue(eval, srcRowIndex, srcColumnIndex));
}
}
}