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bytestriebuilder.h
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1 /*
2 *******************************************************************************
3 * Copyright (C) 2010-2014, International Business Machines
4 * Corporation and others. All Rights Reserved.
5 *******************************************************************************
6 * file name: bytestriebuilder.h
7 * encoding: US-ASCII
8 * tab size: 8 (not used)
9 * indentation:4
10 *
11 * created on: 2010sep25
12 * created by: Markus W. Scherer
13 */
14 
20 #ifndef __BYTESTRIEBUILDER_H__
21 #define __BYTESTRIEBUILDER_H__
22 
23 #include "unicode/utypes.h"
24 #include "unicode/bytestrie.h"
25 #include "unicode/stringpiece.h"
27 
29 
30 class BytesTrieElement;
31 class CharString;
32 
40 public:
46  BytesTrieBuilder(UErrorCode &errorCode);
47 
52  virtual ~BytesTrieBuilder();
53 
68  BytesTrieBuilder &add(const StringPiece &s, int32_t value, UErrorCode &errorCode);
69 
88  BytesTrie *build(UStringTrieBuildOption buildOption, UErrorCode &errorCode);
89 
112  StringPiece buildStringPiece(UStringTrieBuildOption buildOption, UErrorCode &errorCode);
113 
120  BytesTrieBuilder &clear();
121 
122 private:
123  BytesTrieBuilder(const BytesTrieBuilder &other); // no copy constructor
124  BytesTrieBuilder &operator=(const BytesTrieBuilder &other); // no assignment operator
125 
126  void buildBytes(UStringTrieBuildOption buildOption, UErrorCode &errorCode);
127 
128  virtual int32_t getElementStringLength(int32_t i) const;
129  virtual UChar getElementUnit(int32_t i, int32_t byteIndex) const;
130  virtual int32_t getElementValue(int32_t i) const;
131 
132  virtual int32_t getLimitOfLinearMatch(int32_t first, int32_t last, int32_t byteIndex) const;
133 
134  virtual int32_t countElementUnits(int32_t start, int32_t limit, int32_t byteIndex) const;
135  virtual int32_t skipElementsBySomeUnits(int32_t i, int32_t byteIndex, int32_t count) const;
136  virtual int32_t indexOfElementWithNextUnit(int32_t i, int32_t byteIndex, UChar byte) const;
137 
138  virtual UBool matchNodesCanHaveValues() const { return FALSE; }
139 
140  virtual int32_t getMaxBranchLinearSubNodeLength() const { return BytesTrie::kMaxBranchLinearSubNodeLength; }
141  virtual int32_t getMinLinearMatch() const { return BytesTrie::kMinLinearMatch; }
142  virtual int32_t getMaxLinearMatchLength() const { return BytesTrie::kMaxLinearMatchLength; }
143 
147  class BTLinearMatchNode : public LinearMatchNode {
148  public:
149  BTLinearMatchNode(const char *units, int32_t len, Node *nextNode);
150  virtual UBool operator==(const Node &other) const;
151  virtual void write(StringTrieBuilder &builder);
152  private:
153  const char *s;
154  };
155 
156  virtual Node *createLinearMatchNode(int32_t i, int32_t byteIndex, int32_t length,
157  Node *nextNode) const;
158 
159  UBool ensureCapacity(int32_t length);
160  virtual int32_t write(int32_t byte);
161  int32_t write(const char *b, int32_t length);
162  virtual int32_t writeElementUnits(int32_t i, int32_t byteIndex, int32_t length);
163  virtual int32_t writeValueAndFinal(int32_t i, UBool isFinal);
164  virtual int32_t writeValueAndType(UBool hasValue, int32_t value, int32_t node);
165  virtual int32_t writeDeltaTo(int32_t jumpTarget);
166 
167  CharString *strings; // Pointer not object so we need not #include internal charstr.h.
168  BytesTrieElement *elements;
169  int32_t elementsCapacity;
170  int32_t elementsLength;
171 
172  // Byte serialization of the trie.
173  // Grows from the back: bytesLength measures from the end of the buffer!
174  char *bytes;
175  int32_t bytesCapacity;
176  int32_t bytesLength;
177 };
178 
180 
181 #endif // __BYTESTRIEBUILDER_H__