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.PowerPtg;
25:
26: /**
27: * @author Amol S. Deshmukh < amolweb at ya hoo dot com >
28: *
29: */
30: public class PowerEval extends NumericOperationEval {
31:
32: private PowerPtg delegate;
33:
34: private static final ValueEvalToNumericXlator NUM_XLATOR = new ValueEvalToNumericXlator(
35: (short) (ValueEvalToNumericXlator.BOOL_IS_PARSED
36: | ValueEvalToNumericXlator.EVALUATED_REF_BOOL_IS_PARSED
37: | ValueEvalToNumericXlator.EVALUATED_REF_STRING_IS_PARSED
38: | ValueEvalToNumericXlator.REF_BOOL_IS_PARSED
39: | ValueEvalToNumericXlator.STRING_IS_PARSED | ValueEvalToNumericXlator.REF_STRING_IS_PARSED));
40:
41: public PowerEval(Ptg ptg) {
42: delegate = (PowerPtg) ptg;
43: }
44:
45: protected ValueEvalToNumericXlator getXlator() {
46: return NUM_XLATOR;
47: }
48:
49: public Eval evaluate(Eval[] operands, int srcRow, short srcCol) {
50: Eval retval = null;
51: double d0 = 0;
52: double d1 = 0;
53:
54: switch (operands.length) {
55: default: // will rarely happen. currently the parser itself fails.
56: retval = ErrorEval.UNKNOWN_ERROR;
57: break;
58: case 2:
59: ValueEval ve = singleOperandEvaluate(operands[0], srcRow,
60: srcCol);
61: if (ve instanceof NumericValueEval) {
62: d0 = ((NumericValueEval) ve).getNumberValue();
63: } else if (ve instanceof BlankEval) {
64: // do nothing
65: } else {
66: retval = ErrorEval.VALUE_INVALID;
67: }
68:
69: if (retval == null) { // no error yet
70: ve = singleOperandEvaluate(operands[1], srcRow, srcCol);
71: if (ve instanceof NumericValueEval) {
72: d1 = ((NumericValueEval) ve).getNumberValue();
73: } else if (ve instanceof BlankEval) {
74: // do nothing
75: } else {
76: retval = ErrorEval.VALUE_INVALID;
77: }
78: }
79: } // end switch
80:
81: if (retval == null) {
82: double p = Math.pow(d0, d1);
83: retval = (Double.isNaN(p)) ? (ValueEval) ErrorEval.VALUE_INVALID
84: : new NumberEval(p);
85: }
86: return retval;
87: }
88:
89: public int getNumberOfOperands() {
90: return delegate.getNumberOfOperands();
91: }
92:
93: public int getType() {
94: return delegate.getType();
95: }
96: }
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