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source: trunk/sources/HeuristicLab.ExtLibs/HeuristicLab.EPPlus/4.0.3/EPPlus-4.0.3/FormulaParsing/Excel/Functions/RefAndLookup/LookupFunction.cs @ 12074

Last change on this file since 12074 was 12074, checked in by sraggl, 9 years ago

#2341: Added EPPlus-4.0.3 to ExtLibs

File size: 4.6 KB
Line 
1/* Copyright (C) 2011  Jan Källman
2 *
3 * This library is free software; you can redistribute it and/or
4 * modify it under the terms of the GNU Lesser General Public
5 * License as published by the Free Software Foundation; either
6 * version 2.1 of the License, or (at your option) any later version.
7
8 * This library is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
11 * See the GNU Lesser General Public License for more details.
12 *
13 * The GNU Lesser General Public License can be viewed at http://www.opensource.org/licenses/lgpl-license.php
14 * If you unfamiliar with this license or have questions about it, here is an http://www.gnu.org/licenses/gpl-faq.html
15 *
16 * All code and executables are provided "as is" with no warranty either express or implied.
17 * The author accepts no liability for any damage or loss of business that this product may cause.
18 *
19 * Code change notes:
20 *
21 * Author             Change            Date
22 *******************************************************************************
23 * Mats Alm                       Added                   2013-12-03
24 *******************************************************************************/
25using System;
26using System.Collections.Generic;
27using System.Linq;
28using System.Text;
29using OfficeOpenXml.FormulaParsing.ExcelUtilities;
30using OfficeOpenXml.FormulaParsing.ExpressionGraph;
31using OfficeOpenXml.FormulaParsing.Exceptions;
32
33namespace OfficeOpenXml.FormulaParsing.Excel.Functions.RefAndLookup
34{
35    public abstract class LookupFunction : ExcelFunction
36    {
37        private readonly ValueMatcher _valueMatcher;
38        private readonly CompileResultFactory _compileResultFactory;
39
40        public LookupFunction()
41            : this(new LookupValueMatcher(), new CompileResultFactory())
42        {
43
44        }
45
46        public LookupFunction(ValueMatcher valueMatcher, CompileResultFactory compileResultFactory)
47        {
48            _valueMatcher = valueMatcher;
49            _compileResultFactory = compileResultFactory;
50        }
51
52        public override bool IsLookupFuction
53        {
54            get
55            {
56                return true;
57            }
58        }
59
60        protected int IsMatch(object o1, object o2)
61        {
62            return _valueMatcher.IsMatch(o1, o2);
63        }
64
65        protected LookupDirection GetLookupDirection(RangeAddress rangeAddress)
66        {
67            var nRows = rangeAddress.ToRow - rangeAddress.FromRow;
68            var nCols = rangeAddress.ToCol - rangeAddress.FromCol;
69            return nCols > nRows ? LookupDirection.Horizontal : LookupDirection.Vertical;
70        }
71
72        protected CompileResult Lookup(LookupNavigator navigator, LookupArguments lookupArgs)
73        {
74            object lastValue = null;
75            object lastLookupValue = null;
76            int? lastMatchResult = null;
77            if (lookupArgs.SearchedValue == null)
78            {
79                return new CompileResult(ExcelErrorValue.Create(eErrorType.NA), DataType.ExcelError);
80            }
81            do
82            {
83                var matchResult = IsMatch(navigator.CurrentValue, lookupArgs.SearchedValue);
84                if (matchResult != 0)
85                {
86                    if (lastValue != null && navigator.CurrentValue == null) break;
87                   
88                    if (lookupArgs.RangeLookup)
89                    {
90                        if (lastValue == null && matchResult > 0)
91                        {
92                            ThrowExcelErrorValueException(eErrorType.NA);
93                        }
94                        if (lastValue != null && matchResult > 0 && lastMatchResult < 0)
95                        {
96                            return _compileResultFactory.Create(lastLookupValue);
97                        }
98                        lastMatchResult = matchResult;
99                        lastValue = navigator.CurrentValue;
100                        lastLookupValue = navigator.GetLookupValue();
101                    }
102                }
103                else
104                {
105                    return _compileResultFactory.Create(navigator.GetLookupValue());
106                }
107            }
108            while (navigator.MoveNext());
109
110            if (lookupArgs.RangeLookup)
111            {
112                return _compileResultFactory.Create(lastLookupValue);
113            }
114            return new CompileResult(ExcelErrorValue.Create(eErrorType.NA), DataType.ExcelError);
115        }
116    }
117}
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