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// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
*******************************************************************************
* Copyright (C) 2010-2016, International Business Machines
* Corporation and others. All Rights Reserved.
*******************************************************************************
* file name: ucharstriebuilder.h
* encoding: UTF-8
* tab size: 8 (not used)
* indentation:4
*
* created on: 2010nov14
* created by: Markus W. Scherer
*/
#ifndef __UCHARSTRIEBUILDER_H__
#define __UCHARSTRIEBUILDER_H__
#include "unicode/utypes.h"
#if U_SHOW_CPLUSPLUS_API
#include "unicode/stringtriebuilder.h"
#include "unicode/ucharstrie.h"
#include "unicode/unistr.h"
/**
* \file
* \brief C++ API: Builder for icu::UCharsTrie
*/
U_NAMESPACE_BEGIN
class UCharsTrieElement;
/**
* Builder class for UCharsTrie.
*
* This class is not intended for public subclassing.
* @stable ICU 4.8
*/
class U_COMMON_API UCharsTrieBuilder : public StringTrieBuilder {
public:
/**
* Constructs an empty builder.
* @param errorCode Standard ICU error code.
* @stable ICU 4.8
*/
UCharsTrieBuilder(UErrorCode &errorCode);
/**
* Destructor.
* @stable ICU 4.8
*/
virtual ~UCharsTrieBuilder();
/**
* Adds a (string, value) pair.
* The string must be unique.
* The string contents will be copied; the builder does not keep
* a reference to the input UnicodeString or its buffer.
* @param s The input string.
* @param value The value associated with this string.
* @param errorCode Standard ICU error code. Its input value must
* pass the U_SUCCESS() test, or else the function returns
* immediately. Check for U_FAILURE() on output or use with
* function chaining. (See User Guide for details.)
* @return *this
* @stable ICU 4.8
*/
UCharsTrieBuilder &add(const UnicodeString &s, int32_t value, UErrorCode &errorCode);
/**
* Builds a UCharsTrie for the add()ed data.
* Once built, no further data can be add()ed until clear() is called.
*
* A UCharsTrie cannot be empty. At least one (string, value) pair
* must have been add()ed.
*
* This method passes ownership of the builder's internal result array to the new trie object.
* Another call to any build() variant will re-serialize the trie.
* After clear() has been called, a new array will be used as well.
* @param buildOption Build option, see UStringTrieBuildOption.
* @param errorCode Standard ICU error code. Its input value must
* pass the U_SUCCESS() test, or else the function returns
* immediately. Check for U_FAILURE() on output or use with
* function chaining. (See User Guide for details.)
* @return A new UCharsTrie for the add()ed data.
* @stable ICU 4.8
*/
UCharsTrie *build(UStringTrieBuildOption buildOption, UErrorCode &errorCode);
/**
* Builds a UCharsTrie for the add()ed data and char16_t-serializes it.
* Once built, no further data can be add()ed until clear() is called.
*
* A UCharsTrie cannot be empty. At least one (string, value) pair
* must have been add()ed.
*
* Multiple calls to buildUnicodeString() set the UnicodeStrings to the
* builder's same char16_t array, without rebuilding.
* If buildUnicodeString() is called after build(), the trie will be
* re-serialized into a new array (because build() passes on ownership).
* If build() is called after buildUnicodeString(), the trie object returned
* by build() will become the owner of the underlying data for the
* previously returned UnicodeString.
* After clear() has been called, a new array will be used as well.
* @param buildOption Build option, see UStringTrieBuildOption.
* @param result A UnicodeString which will be set to the char16_t-serialized
* UCharsTrie for the add()ed data.
* @param errorCode Standard ICU error code. Its input value must
* pass the U_SUCCESS() test, or else the function returns
* immediately. Check for U_FAILURE() on output or use with
* function chaining. (See User Guide for details.)
* @return result
* @stable ICU 4.8
*/
UnicodeString &buildUnicodeString(UStringTrieBuildOption buildOption, UnicodeString &result,
UErrorCode &errorCode);
/**
* Removes all (string, value) pairs.
* New data can then be add()ed and a new trie can be built.
* @return *this
* @stable ICU 4.8
*/
UCharsTrieBuilder &clear() {
strings.remove();
elementsLength=0;
ucharsLength=0;
return *this;
}
private:
UCharsTrieBuilder(const UCharsTrieBuilder &other) = delete; // no copy constructor
UCharsTrieBuilder &operator=(const UCharsTrieBuilder &other) = delete; // no assignment operator
void buildUChars(UStringTrieBuildOption buildOption, UErrorCode &errorCode);
virtual int32_t getElementStringLength(int32_t i) const override;
virtual char16_t getElementUnit(int32_t i, int32_t unitIndex) const override;
virtual int32_t getElementValue(int32_t i) const override;
virtual int32_t getLimitOfLinearMatch(int32_t first, int32_t last, int32_t unitIndex) const override;
virtual int32_t countElementUnits(int32_t start, int32_t limit, int32_t unitIndex) const override;
virtual int32_t skipElementsBySomeUnits(int32_t i, int32_t unitIndex, int32_t count) const override;
virtual int32_t indexOfElementWithNextUnit(int32_t i, int32_t unitIndex, char16_t unit) const override;
virtual UBool matchNodesCanHaveValues() const override { return true; }
virtual int32_t getMaxBranchLinearSubNodeLength() const override { return UCharsTrie::kMaxBranchLinearSubNodeLength; }
virtual int32_t getMinLinearMatch() const override { return UCharsTrie::kMinLinearMatch; }
virtual int32_t getMaxLinearMatchLength() const override { return UCharsTrie::kMaxLinearMatchLength; }
class UCTLinearMatchNode : public LinearMatchNode {
public:
UCTLinearMatchNode(const char16_t *units, int32_t len, Node *nextNode);
virtual bool operator==(const Node &other) const override;
virtual void write(StringTrieBuilder &builder) override;
private:
const char16_t *s;
};
virtual Node *createLinearMatchNode(int32_t i, int32_t unitIndex, int32_t length,
Node *nextNode) const override;
UBool ensureCapacity(int32_t length);
virtual int32_t write(int32_t unit) override;
int32_t write(const char16_t *s, int32_t length);
virtual int32_t writeElementUnits(int32_t i, int32_t unitIndex, int32_t length) override;
virtual int32_t writeValueAndFinal(int32_t i, UBool isFinal) override;
virtual int32_t writeValueAndType(UBool hasValue, int32_t value, int32_t node) override;
virtual int32_t writeDeltaTo(int32_t jumpTarget) override;
UnicodeString strings;
UCharsTrieElement *elements;
int32_t elementsCapacity;
int32_t elementsLength;
// char16_t serialization of the trie.
// Grows from the back: ucharsLength measures from the end of the buffer!
char16_t *uchars;
int32_t ucharsCapacity;
int32_t ucharsLength;
};
U_NAMESPACE_END
#endif /* U_SHOW_CPLUSPLUS_API */
#endif // __UCHARSTRIEBUILDER_H__
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