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NumericUtils.h
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1 // Copyright (c) 2009-2014 Alan Wright. All rights reserved.
3 // Distributable under the terms of either the Apache License (Version 2.0)
4 // or the GNU Lesser General Public License.
6
7 #ifndef NUMERICUTILS_H
8 #define NUMERICUTILS_H
9
10 #include "LuceneObject.h"
11
12 namespace Lucene {
13
37 class LPPAPI NumericUtils : public LuceneObject {
38 public:
39 virtual ~NumericUtils();
40
41 LUCENE_CLASS(NumericUtils);
42
43 public:
46 static const int32_t PRECISION_STEP_DEFAULT;
47
50 static const wchar_t SHIFT_START_LONG;
51
54 static const int32_t BUF_SIZE_LONG;
55
58 static const wchar_t SHIFT_START_INT;
59
62 static const int32_t BUF_SIZE_INT;
63
64 public:
71 static int32_t longToPrefixCoded(int64_t val, int32_t shift, CharArray buffer);
72
77 static String longToPrefixCoded(int64_t val, int32_t shift);
78
82 static String longToPrefixCoded(int64_t val);
83
90 static int32_t intToPrefixCoded(int32_t val, int32_t shift, CharArray buffer);
91
96 static String intToPrefixCoded(int32_t val, int32_t shift);
97
101 static String intToPrefixCoded(int32_t val);
102
106 static int64_t prefixCodedToLong(const String& prefixCoded);
107
111 static int32_t prefixCodedToInt(const String& prefixCoded);
112
117 static int64_t doubleToSortableLong(double val);
118
120 static String doubleToPrefixCoded(double val);
121
124 static double sortableLongToDouble(int64_t val);
125
127 static double prefixCodedToDouble(const String& val);
128
132 static void splitLongRange(const LongRangeBuilderPtr& builder, int32_t precisionStep, int64_t minBound, int64_t maxBound);
133
137 static void splitIntRange(const IntRangeBuilderPtr& builder, int32_t precisionStep, int32_t minBound, int32_t maxBound);
138
140 static void splitRange(const LuceneObjectPtr& builder, int32_t valSize, int32_t precisionStep, int64_t minBound, int64_t maxBound);
141
143 static void addRange(const LuceneObjectPtr& builder, int32_t valSize, int64_t minBound, int64_t maxBound, int32_t shift);
144 };
145
148 class LPPAPI LongRangeBuilder : public LuceneObject {
149 public:
150 virtual ~LongRangeBuilder();
151
152 public:
155 virtual void addRange(const String& minPrefixCoded, const String& maxPrefixCoded);
156
159 virtual void addRange(int64_t min, int64_t max, int32_t shift);
160 };
161
162 class LPPAPI IntRangeBuilder : public LuceneObject {
163 public:
164 virtual ~IntRangeBuilder();
165
166 public:
169 virtual void addRange(const String& minPrefixCoded, const String& maxPrefixCoded);
170
173 virtual void addRange(int32_t min, int32_t max, int32_t shift);
174 };
175
176 }
177
178 #endif
Lucene::NumericUtils::BUF_SIZE_LONG
static const int32_t BUF_SIZE_LONG
The maximum term length (used for char[] buffer size) for encoding long values.
Definition: NumericUtils.h:54
Lucene::IntRangeBuilderPtr
boost::shared_ptr< IntRangeBuilder > IntRangeBuilderPtr
Definition: LuceneTypes.h:537
LUCENE_CLASS
#define LUCENE_CLASS(Name)
Definition: LuceneObject.h:24
Lucene::NumericUtils::SHIFT_START_LONG
static const wchar_t SHIFT_START_LONG
Longs are stored at lower precision by shifting off lower bits. The shift count is stored as SHIFT_ST...
Definition: NumericUtils.h:50
Lucene::LuceneObjectPtr
boost::shared_ptr< LuceneObject > LuceneObjectPtr
Definition: LuceneTypes.h:539
Lucene::NumericUtils::BUF_SIZE_INT
static const int32_t BUF_SIZE_INT
The maximum term length (used for char[] buffer size) for encoding int values.
Definition: NumericUtils.h:62
Lucene::NumericUtils
This is a helper class to generate prefix-encoded representations for numerical values and supplies c...
Definition: NumericUtils.h:37
Lucene::IntRangeBuilder
Definition: NumericUtils.h:162
Lucene
Definition: AbstractAllTermDocs.h:12
Lucene::LuceneObject
Base class for all Lucene classes.
Definition: LuceneObject.h:31
Lucene::LongRangeBuilder
Callback for splitLongRange. You need to overwrite only one of the methods. NOTE: This is a very low-...
Definition: NumericUtils.h:148
Lucene::LongRangeBuilderPtr
boost::shared_ptr< LongRangeBuilder > LongRangeBuilderPtr
Definition: LuceneTypes.h:538
Lucene::NumericUtils::SHIFT_START_INT
static const wchar_t SHIFT_START_INT
Integers are stored at lower precision by shifting off lower bits. The shift count is stored as SHIFT...
Definition: NumericUtils.h:58
LuceneObject.h

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