/*
* 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);
}
}