org.apache.poi.ss.formula.functions.Replace Maven / Gradle / Ivy
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package org.apache.poi.ss.formula.functions;
import org.apache.poi.ss.formula.eval.ErrorEval;
import org.apache.poi.ss.formula.eval.EvaluationException;
import org.apache.poi.ss.formula.eval.StringEval;
import org.apache.poi.ss.formula.eval.ValueEval;
/**
* An implementation of the Excel REPLACE() function:
* Replaces part of a text string based on the number of characters
* you specify, with another text string.
*
* Syntax:
* REPLACE(oldText, startNum, numChars, newText)
*
* oldText The text string containing characters to replace
* startNum The position of the first character to replace (1-based)
* numChars The number of characters to replace
* newText The new text value to replace the removed section
*
* @author Manda Wilson < wilson at c bio dot msk cc dot org >
*/
public final class Replace extends Fixed4ArgFunction {
public ValueEval evaluate(int srcRowIndex, int srcColumnIndex, ValueEval arg0, ValueEval arg1,
ValueEval arg2, ValueEval arg3) {
String oldStr;
int startNum;
int numChars;
String newStr;
try {
oldStr = TextFunction.evaluateStringArg(arg0, srcRowIndex, srcColumnIndex);
startNum = TextFunction.evaluateIntArg(arg1, srcRowIndex, srcColumnIndex);
numChars = TextFunction.evaluateIntArg(arg2, srcRowIndex, srcColumnIndex);
newStr = TextFunction.evaluateStringArg(arg3, srcRowIndex, srcColumnIndex);
} catch (EvaluationException e) {
return e.getErrorEval();
}
if (startNum < 1 || numChars < 0) {
return ErrorEval.VALUE_INVALID;
}
StringBuffer strBuff = new StringBuffer(oldStr);
// remove any characters that should be replaced
if (startNum <= oldStr.length() && numChars != 0) {
strBuff.delete(startNum - 1, startNum - 1 + numChars);
}
// now insert (or append) newStr
if (startNum > strBuff.length()) {
strBuff.append(newStr);
} else {
strBuff.insert(startNum - 1, newStr);
}
return new StringEval(strBuff.toString());
}
}