/* ====================================================================
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
==================================================================== */
package org.apache.poi.hssf.record.formula.functions;
import org.apache.poi.hssf.record.formula.eval.AreaEval;
import org.apache.poi.hssf.record.formula.eval.ErrorEval;
import org.apache.poi.hssf.record.formula.eval.Eval;
import org.apache.poi.hssf.record.formula.eval.NumberEval;
import org.apache.poi.hssf.record.formula.eval.RefEval;
/**
* Implementation for Excel COLUMNS function.
*
* @author Josh Micich
*/
public final class Columns implements Function {
public Eval evaluate(Eval[] args, int srcCellRow, short srcCellCol) {
switch(args.length) {
case 1:
// expected
break;
case 0:
// too few arguments
return ErrorEval.VALUE_INVALID;
default:
// too many arguments
return ErrorEval.VALUE_INVALID;
}
Eval firstArg = args[0];
int result;
if (firstArg instanceof AreaEval) {
AreaEval ae = (AreaEval) firstArg;
result = ae.getLastColumn() - ae.getFirstColumn() + 1;
} else if (firstArg instanceof RefEval) {
result = 1;
} else { // anything else is not valid argument
return ErrorEval.VALUE_INVALID;
}
return new NumberEval(result);
}
}