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comparison: intl/icu/source/common/unicode/ucharstriebuilder.h

intl/icu/source/common/unicode/ucharstriebuilder.h

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1 /*
2 *******************************************************************************
3 * Copyright (C) 2010-2013, International Business Machines
4 * Corporation and others. All Rights Reserved.
5 *******************************************************************************
6 * file name: ucharstriebuilder.h
7 * encoding: US-ASCII
8 * tab size: 8 (not used)
9 * indentation:4
10 *
11 * created on: 2010nov14
12 * created by: Markus W. Scherer
13 */
14
15 #ifndef __UCHARSTRIEBUILDER_H__
16 #define __UCHARSTRIEBUILDER_H__
17
18 #include "unicode/utypes.h"
19 #include "unicode/stringtriebuilder.h"
20 #include "unicode/ucharstrie.h"
21 #include "unicode/unistr.h"
22
23 /**
24 * \file
25 * \brief C++ API: Builder for icu::UCharsTrie
26 */
27
28 U_NAMESPACE_BEGIN
29
30 class UCharsTrieElement;
31
32 /**
33 * Builder class for UCharsTrie.
34 *
35 * This class is not intended for public subclassing.
36 * @stable ICU 4.8
37 */
38 class U_COMMON_API UCharsTrieBuilder : public StringTrieBuilder {
39 public:
40 /**
41 * Constructs an empty builder.
42 * @param errorCode Standard ICU error code.
43 * @stable ICU 4.8
44 */
45 UCharsTrieBuilder(UErrorCode &errorCode);
46
47 /**
48 * Destructor.
49 * @stable ICU 4.8
50 */
51 virtual ~UCharsTrieBuilder();
52
53 /**
54 * Adds a (string, value) pair.
55 * The string must be unique.
56 * The string contents will be copied; the builder does not keep
57 * a reference to the input UnicodeString or its buffer.
58 * @param s The input string.
59 * @param value The value associated with this string.
60 * @param errorCode Standard ICU error code. Its input value must
61 * pass the U_SUCCESS() test, or else the function returns
62 * immediately. Check for U_FAILURE() on output or use with
63 * function chaining. (See User Guide for details.)
64 * @return *this
65 * @stable ICU 4.8
66 */
67 UCharsTrieBuilder &add(const UnicodeString &s, int32_t value, UErrorCode &errorCode);
68
69 /**
70 * Builds a UCharsTrie for the add()ed data.
71 * Once built, no further data can be add()ed until clear() is called.
72 *
73 * A UCharsTrie cannot be empty. At least one (string, value) pair
74 * must have been add()ed.
75 *
76 * This method passes ownership of the builder's internal result array to the new trie object.
77 * Another call to any build() variant will re-serialize the trie.
78 * After clear() has been called, a new array will be used as well.
79 * @param buildOption Build option, see UStringTrieBuildOption.
80 * @param errorCode Standard ICU error code. Its input value must
81 * pass the U_SUCCESS() test, or else the function returns
82 * immediately. Check for U_FAILURE() on output or use with
83 * function chaining. (See User Guide for details.)
84 * @return A new UCharsTrie for the add()ed data.
85 * @stable ICU 4.8
86 */
87 UCharsTrie *build(UStringTrieBuildOption buildOption, UErrorCode &errorCode);
88
89 /**
90 * Builds a UCharsTrie for the add()ed data and UChar-serializes it.
91 * Once built, no further data can be add()ed until clear() is called.
92 *
93 * A UCharsTrie cannot be empty. At least one (string, value) pair
94 * must have been add()ed.
95 *
96 * Multiple calls to buildUnicodeString() set the UnicodeStrings to the
97 * builder's same UChar array, without rebuilding.
98 * If buildUnicodeString() is called after build(), the trie will be
99 * re-serialized into a new array.
100 * If build() is called after buildUnicodeString(), the trie object will become
101 * the owner of the previously returned array.
102 * After clear() has been called, a new array will be used as well.
103 * @param buildOption Build option, see UStringTrieBuildOption.
104 * @param result A UnicodeString which will be set to the UChar-serialized
105 * UCharsTrie for the add()ed data.
106 * @param errorCode Standard ICU error code. Its input value must
107 * pass the U_SUCCESS() test, or else the function returns
108 * immediately. Check for U_FAILURE() on output or use with
109 * function chaining. (See User Guide for details.)
110 * @return result
111 * @stable ICU 4.8
112 */
113 UnicodeString &buildUnicodeString(UStringTrieBuildOption buildOption, UnicodeString &result,
114 UErrorCode &errorCode);
115
116 /**
117 * Removes all (string, value) pairs.
118 * New data can then be add()ed and a new trie can be built.
119 * @return *this
120 * @stable ICU 4.8
121 */
122 UCharsTrieBuilder &clear() {
123 strings.remove();
124 elementsLength=0;
125 ucharsLength=0;
126 return *this;
127 }
128
129 private:
130 UCharsTrieBuilder(const UCharsTrieBuilder &other); // no copy constructor
131 UCharsTrieBuilder &operator=(const UCharsTrieBuilder &other); // no assignment operator
132
133 void buildUChars(UStringTrieBuildOption buildOption, UErrorCode &errorCode);
134
135 virtual int32_t getElementStringLength(int32_t i) const;
136 virtual UChar getElementUnit(int32_t i, int32_t unitIndex) const;
137 virtual int32_t getElementValue(int32_t i) const;
138
139 virtual int32_t getLimitOfLinearMatch(int32_t first, int32_t last, int32_t unitIndex) const;
140
141 virtual int32_t countElementUnits(int32_t start, int32_t limit, int32_t unitIndex) const;
142 virtual int32_t skipElementsBySomeUnits(int32_t i, int32_t unitIndex, int32_t count) const;
143 virtual int32_t indexOfElementWithNextUnit(int32_t i, int32_t unitIndex, UChar unit) const;
144
145 virtual UBool matchNodesCanHaveValues() const { return TRUE; }
146
147 virtual int32_t getMaxBranchLinearSubNodeLength() const { return UCharsTrie::kMaxBranchLinearSubNodeLength; }
148 virtual int32_t getMinLinearMatch() const { return UCharsTrie::kMinLinearMatch; }
149 virtual int32_t getMaxLinearMatchLength() const { return UCharsTrie::kMaxLinearMatchLength; }
150
151 #ifndef U_HIDE_INTERNAL_API
152 class UCTLinearMatchNode : public LinearMatchNode {
153 public:
154 UCTLinearMatchNode(const UChar *units, int32_t len, Node *nextNode);
155 virtual UBool operator==(const Node &other) const;
156 virtual void write(StringTrieBuilder &builder);
157 private:
158 const UChar *s;
159 };
160 #endif
161
162 virtual Node *createLinearMatchNode(int32_t i, int32_t unitIndex, int32_t length,
163 Node *nextNode) const;
164
165 UBool ensureCapacity(int32_t length);
166 virtual int32_t write(int32_t unit);
167 int32_t write(const UChar *s, int32_t length);
168 virtual int32_t writeElementUnits(int32_t i, int32_t unitIndex, int32_t length);
169 virtual int32_t writeValueAndFinal(int32_t i, UBool isFinal);
170 virtual int32_t writeValueAndType(UBool hasValue, int32_t value, int32_t node);
171 virtual int32_t writeDeltaTo(int32_t jumpTarget);
172
173 UnicodeString strings;
174 UCharsTrieElement *elements;
175 int32_t elementsCapacity;
176 int32_t elementsLength;
177
178 // UChar serialization of the trie.
179 // Grows from the back: ucharsLength measures from the end of the buffer!
180 UChar *uchars;
181 int32_t ucharsCapacity;
182 int32_t ucharsLength;
183 };
184
185 U_NAMESPACE_END
186
187 #endif // __UCHARSTRIEBUILDER_H__

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