/*
* 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.
*/
/*
* Created on May 15, 2005
*
*/
package org.apache.poi.hssf.record.formula.functions;
import org.apache.poi.hssf.record.formula.eval.BlankEval;
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.NumericValueEval;
import org.apache.poi.hssf.record.formula.eval.ValueEval;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
/**
*
* @author Guenter Kickinger g.kickinger@gmx.net
*
*/
public class Month extends NumericFunction {
/* (non-Javadoc)
* @see org.apache.poi.hssf.record.formula.functions.Function#evaluate(org.apache.poi.hssf.record.formula.eval.Eval[], int, short)
*/
public Eval evaluate(Eval[] operands, int srcCellRow, short srcCellCol) {
ValueEval retval = null;
switch (operands.length) {
default:
retval = ErrorEval.VALUE_INVALID;
break;
case 1:
ValueEval ve = singleOperandEvaluate(operands[0], srcCellRow, srcCellCol);
if (ve instanceof NumericValueEval) {
NumericValueEval ne = (NumericValueEval) ve;
if (HSSFDateUtil.isValidExcelDate(ne.getNumberValue())) {
java.util.Date d = HSSFDateUtil.getJavaDate(ne.getNumberValue(), false); // XXX fix 1900/1904 problem
retval = new NumberEval(d.getMonth()+1);
} else {
retval = ErrorEval.NUM_ERROR;
}
}
else if (ve instanceof BlankEval) {
// do nothing
} else {
retval = ErrorEval.NUM_ERROR;
}
}
return retval;
}
}