1 /* 2 ******************************************************************************* 3 * Copyright (C) 2010-2014, 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 class UCTLinearMatchNode : public LinearMatchNode { 152 public: 153 UCTLinearMatchNode(const UChar *units, int32_t len, Node *nextNode); 154 virtual UBool operator==(const Node &other) const; 155 virtual void write(StringTrieBuilder &builder); 156 private: 157 const UChar *s; 158 }; 159 160 virtual Node *createLinearMatchNode(int32_t i, int32_t unitIndex, int32_t length, 161 Node *nextNode) const; 162 163 UBool ensureCapacity(int32_t length); 164 virtual int32_t write(int32_t unit); 165 int32_t write(const UChar *s, int32_t length); 166 virtual int32_t writeElementUnits(int32_t i, int32_t unitIndex, int32_t length); 167 virtual int32_t writeValueAndFinal(int32_t i, UBool isFinal); 168 virtual int32_t writeValueAndType(UBool hasValue, int32_t value, int32_t node); 169 virtual int32_t writeDeltaTo(int32_t jumpTarget); 170 171 UnicodeString strings; 172 UCharsTrieElement *elements; 173 int32_t elementsCapacity; 174 int32_t elementsLength; 175 176 // UChar serialization of the trie. 177 // Grows from the back: ucharsLength measures from the end of the buffer! 178 UChar *uchars; 179 int32_t ucharsCapacity; 180 int32_t ucharsLength; 181 }; 182 183 U_NAMESPACE_END 184 185 #endif // __UCHARSTRIEBUILDER_H__ 186
