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.ErrorEval;
24: import org.apache.poi.hssf.record.formula.eval.Eval;
25: import org.apache.poi.hssf.record.formula.eval.NumberEval;
26: import org.apache.poi.hssf.record.formula.eval.ValueEval;
27: import org.apache.poi.hssf.record.formula.eval.ValueEvalToNumericXlator;
28:
29: /**
30: * @author Amol S. Deshmukh < amolweb at ya hoo dot com >
31: *
32: */
33: public class Median extends MultiOperandNumericFunction {
34: private static final ValueEvalToNumericXlator DEFAULT_NUM_XLATOR = new ValueEvalToNumericXlator(
35: (short) (0 | ValueEvalToNumericXlator.BOOL_IS_PARSED
36: //| ValueEvalToNumericXlator.REF_BOOL_IS_PARSED
37: //| ValueEvalToNumericXlator.EVALUATED_REF_BOOL_IS_PARSED
38: | ValueEvalToNumericXlator.STRING_IS_PARSED
39: //| ValueEvalToNumericXlator.REF_STRING_IS_PARSED
40: //| ValueEvalToNumericXlator.EVALUATED_REF_STRING_IS_PARSED
41: //| ValueEvalToNumericXlator.STRING_TO_BOOL_IS_PARSED
42: //| ValueEvalToNumericXlator.REF_STRING_TO_BOOL_IS_PARSED
43: //| ValueEvalToNumericXlator.STRING_IS_INVALID_VALUE
44: //| ValueEvalToNumericXlator.REF_STRING_IS_INVALID_VALUE
45: //| ValueEvalToNumericXlator.EVALUATED_REF_BLANK_IS_PARSED
46: //| ValueEvalToNumericXlator.REF_BLANK_IS_PARSED
47: //| ValueEvalToNumericXlator.BLANK_IS_PARSED
48: ));
49:
50: /**
51: * this is the default impl for the factory method getXlator
52: * of the super class NumericFunction. Subclasses can override this method
53: * if they desire to return a different ValueEvalToNumericXlator instance
54: * than the default.
55: */
56: protected ValueEvalToNumericXlator getXlator() {
57: return DEFAULT_NUM_XLATOR;
58: }
59:
60: public Eval evaluate(Eval[] operands, int srcCellRow,
61: short srcCellCol) {
62: ValueEval retval = null;
63: double[] values = getNumberArray(operands, srcCellRow,
64: srcCellCol);
65: if (values == null) {
66: retval = ErrorEval.VALUE_INVALID;
67: } else {
68: double d = StatsLib.median(values);
69: retval = (Double.isNaN(d) || Double.isInfinite(d)) ? (ValueEval) ErrorEval.NUM_ERROR
70: : new NumberEval(d);
71: }
72:
73: return retval;
74: }
75: }
|