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 IntersectionEval extends Fixed2ArgFunction {
public static final Function instance = new IntersectionEval();
private IntersectionEval() {
}
public ValueEval evaluate(int srcRowIndex, int srcColumnIndex, ValueEval arg0, ValueEval arg1) {
try {
AreaEval reA = evaluateRef(arg0);
AreaEval reB = evaluateRef(arg1);
AreaEval result = resolveRange(reA, reB);
if (result == null) {
return ErrorEval.NULL_INTERSECTION;
}
return result;
} catch (EvaluationException e) {
return e.getErrorEval();
}
}
private static AreaEval resolveRange(AreaEval aeA, AreaEval aeB) {
int aeAfr = aeA.getFirstRow();
int aeAfc = aeA.getFirstColumn();
int aeBlc = aeB.getLastColumn();
if (aeAfc > aeBlc) {
return null;
}
int aeBfc = aeB.getFirstColumn();
if (aeBfc > aeA.getLastColumn()) {
return null;
}
int aeBlr = aeB.getLastRow();
if (aeAfr > aeBlr) {
return null;
}
int aeBfr = aeB.getFirstRow();
int aeAlr = aeA.getLastRow();
if (aeBfr > aeAlr) {
return null;
}
int top = Math.max(aeAfr, aeBfr);
int bottom = Math.min(aeAlr, aeBlr);
int left = Math.max(aeAfc, aeBfc);
int right = Math.min(aeA.getLastColumn(), aeBlc);
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() + ")");
}
}