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 8, 2005
19: *
20: */
21: package org.apache.poi.hssf.record.formula.eval;
22:
23: import org.apache.poi.hssf.record.formula.Ptg;
24: import org.apache.poi.hssf.record.formula.UnaryMinusPtg;
25:
26: /**
27: * @author Amol S. Deshmukh < amolweb at ya hoo dot com >
28: *
29: */
30: public class UnaryMinusEval extends NumericOperationEval {
31:
32: private UnaryMinusPtg delegate;
33: private static final ValueEvalToNumericXlator NUM_XLATOR = new ValueEvalToNumericXlator(
34: (short) (ValueEvalToNumericXlator.BOOL_IS_PARSED
35: | ValueEvalToNumericXlator.EVALUATED_REF_BOOL_IS_PARSED
36: | ValueEvalToNumericXlator.EVALUATED_REF_STRING_IS_PARSED
37: | ValueEvalToNumericXlator.REF_BOOL_IS_PARSED
38: | ValueEvalToNumericXlator.STRING_IS_PARSED | ValueEvalToNumericXlator.REF_STRING_IS_PARSED));
39:
40: public UnaryMinusEval(Ptg ptg) {
41: this .delegate = (UnaryMinusPtg) ptg;
42: }
43:
44: protected ValueEvalToNumericXlator getXlator() {
45: return NUM_XLATOR;
46: }
47:
48: public Eval evaluate(Eval[] operands, int srcRow, short srcCol) {
49: ValueEval retval = null;
50: double d = 0;
51:
52: switch (operands.length) {
53: default:
54: retval = ErrorEval.UNKNOWN_ERROR;
55: break;
56: case 1:
57: ValueEval ve = singleOperandEvaluate(operands[0], srcRow,
58: srcCol);
59: if (ve instanceof NumericValueEval) {
60: d = ((NumericValueEval) ve).getNumberValue();
61: } else if (ve instanceof BlankEval) {
62: // do nothing
63: } else if (ve instanceof ErrorEval) {
64: retval = ve;
65: }
66: }
67:
68: if (retval == null) {
69: retval = new NumberEval(-d);
70: }
71:
72: return retval;
73: }
74:
75: public int getNumberOfOperands() {
76: return delegate.getNumberOfOperands();
77: }
78:
79: public int getType() {
80: return delegate.getType();
81: }
82:
83: }
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