mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-05 15:21:43 +00:00
75 lines
1.6 KiB
C++
75 lines
1.6 KiB
C++
#pragma once
|
||
|
||
#include <unicode/ucol.h>
|
||
|
||
#include <DB/Common/Exception.h>
|
||
#include <DB/IO/WriteHelpers.h>
|
||
|
||
#include <common/Common.h>
|
||
|
||
#include <Poco/String.h>
|
||
|
||
#include <boost/noncopyable.hpp>
|
||
|
||
|
||
namespace DB
|
||
{
|
||
namespace ErrorCodes
|
||
{
|
||
extern const int UNSUPPORTED_COLLATION_LOCALE;
|
||
extern const int COLLATION_COMPARISON_FAILED;
|
||
}
|
||
}
|
||
|
||
|
||
class Collator : private boost::noncopyable
|
||
{
|
||
public:
|
||
explicit Collator(const std::string & locale_) : locale(Poco::toLower(locale_))
|
||
{
|
||
UErrorCode status = U_ZERO_ERROR;
|
||
|
||
collator = ucol_open(locale.c_str(), &status);
|
||
if (status != U_ZERO_ERROR)
|
||
{
|
||
ucol_close(collator);
|
||
throw DB::Exception("Unsupported collation locale: " + locale, DB::ErrorCodes::UNSUPPORTED_COLLATION_LOCALE);
|
||
}
|
||
}
|
||
|
||
~Collator()
|
||
{
|
||
ucol_close(collator);
|
||
}
|
||
|
||
int compare(const char * str1, size_t length1, const char * str2, size_t length2) const
|
||
{
|
||
UCharIterator iter1, iter2;
|
||
uiter_setUTF8(&iter1, str1, length1);
|
||
uiter_setUTF8(&iter2, str2, length2);
|
||
|
||
UErrorCode status = U_ZERO_ERROR;
|
||
UCollationResult compare_result = ucol_strcollIter(collator, &iter1, &iter2, &status);
|
||
|
||
if (status != U_ZERO_ERROR)
|
||
throw DB::Exception("ICU collation comparison failed with error code: " + DB::toString(status),
|
||
DB::ErrorCodes::COLLATION_COMPARISON_FAILED);
|
||
|
||
/** Значения enum UCollationResult совпадают с нужными нам:
|
||
* UCOL_EQUAL = 0
|
||
* UCOL_GREATER = 1
|
||
* UCOL_LESS = -1
|
||
*/
|
||
return compare_result;
|
||
}
|
||
|
||
const std::string & getLocale() const
|
||
{
|
||
return locale;
|
||
}
|
||
|
||
private:
|
||
std::string locale;
|
||
UCollator * collator;
|
||
};
|