01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * http://www.apache.org/licenses/LICENSE-2.0
10: *
11: * Unless required by applicable law or agreed to in writing, software
12: * distributed under the License is distributed on an "AS IS" BASIS,
13: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14: * See the License for the specific language governing permissions and
15: * limitations under the License.
16: */
17: /*
18: * Created on May 15, 2005
19: *
20: */
21: package org.apache.poi.hssf.record.formula.functions;
22:
23: import org.apache.poi.hssf.record.formula.eval.BlankEval;
24: import org.apache.poi.hssf.record.formula.eval.ErrorEval;
25: import org.apache.poi.hssf.record.formula.eval.Eval;
26: import org.apache.poi.hssf.record.formula.eval.NumberEval;
27: import org.apache.poi.hssf.record.formula.eval.NumericValueEval;
28: import org.apache.poi.hssf.record.formula.eval.ValueEval;
29: import org.apache.poi.hssf.usermodel.HSSFDateUtil;
30:
31: /**
32: *
33: * @author Guenter Kickinger g.kickinger@gmx.net
34: *
35: */
36: public class Month extends NumericFunction {
37:
38: /* (non-Javadoc)
39: * @see org.apache.poi.hssf.record.formula.functions.Function#evaluate(org.apache.poi.hssf.record.formula.eval.Eval[], int, short)
40: */
41: public Eval evaluate(Eval[] operands, int srcCellRow,
42: short srcCellCol) {
43: ValueEval retval = null;
44:
45: switch (operands.length) {
46: default:
47: retval = ErrorEval.VALUE_INVALID;
48: break;
49: case 1:
50: ValueEval ve = singleOperandEvaluate(operands[0],
51: srcCellRow, srcCellCol);
52: if (ve instanceof NumericValueEval) {
53: NumericValueEval ne = (NumericValueEval) ve;
54: if (HSSFDateUtil.isValidExcelDate(ne.getNumberValue())) {
55: java.util.Date d = HSSFDateUtil.getJavaDate(ne
56: .getNumberValue(), false); // XXX fix 1900/1904 problem
57: retval = new NumberEval(d.getMonth() + 1);
58: } else {
59: retval = ErrorEval.NUM_ERROR;
60: }
61: } else if (ve instanceof BlankEval) {
62: // do nothing
63: } else {
64: retval = ErrorEval.NUM_ERROR;
65: }
66: }
67: return retval;
68: }
69: }
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