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.BoolEval;
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.RefEval;
28:
29: /**
30: * @author Amol S. Deshmukh < amolweb at ya hoo dot com >
31: *
32: */
33: public class Isnumber extends LogicalFunction {
34: public Eval evaluate(Eval[] operands, int srcCellRow,
35: short srcCellCol) {
36: Eval retval = BoolEval.FALSE;
37:
38: switch (operands.length) {
39: default:
40: retval = ErrorEval.VALUE_INVALID;
41: break;
42: case 1:
43: Eval eval = operands[0];
44: if (eval instanceof NumberEval) {
45: retval = BoolEval.TRUE;
46: } else if (eval instanceof RefEval) {
47: Eval xlatedEval = xlateRefEval((RefEval) eval);
48: if (xlatedEval instanceof NumberEval) {
49: retval = BoolEval.TRUE;
50: }
51: }
52: }
53:
54: return retval;
55: }
56: }
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