package org.apache.poi.ss.formula.eval;
import org.apache.poi.ss.formula.functions.Fixed2ArgFunction;
import org.apache.poi.ss.formula.functions.Function;
public final class RangeEval extends Fixed2ArgFunction {
public static final Function instance = new RangeEval();
private RangeEval() {
}
public ValueEval evaluate(int srcRowIndex, int srcColumnIndex, ValueEval arg0, ValueEval arg1) {
try {
AreaEval reA = evaluateRef(arg0);
AreaEval reB = evaluateRef(arg1);
return resolveRange(reA, reB);
} catch (EvaluationException e) {
return e.getErrorEval();
}
}
private static AreaEval resolveRange(AreaEval aeA, AreaEval aeB) {
int aeAfr = aeA.getFirstRow();
int aeAfc = aeA.getFirstColumn();
int top = Math.min(aeAfr, aeB.getFirstRow());
int bottom = Math.max(aeA.getLastRow(), aeB.getLastRow());
int left = Math.min(aeAfc, aeB.getFirstColumn());
int right = Math.max(aeA.getLastColumn(), aeB.getLastColumn());
return aeA.offset(top-aeAfr, bottom-aeAfr, left-aeAfc, right-aeAfc);
}
private static AreaEval evaluateRef(ValueEval arg) throws EvaluationException {
if (arg instanceof AreaEval) {
return (AreaEval) arg;
}
if (arg instanceof RefEval) {
return ((RefEval) arg).offset(0, 0, 0, 0);
}
if (arg instanceof ErrorEval) {
throw new EvaluationException((ErrorEval)arg);
}
throw new IllegalArgumentException("Unexpected ref arg class (" + arg.getClass().getName() + ")");
}
}