2011-11-06 00:59:37 +00:00
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#pragma once
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2010-05-18 18:51:51 +00:00
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#include <DB/Core/Exception.h>
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#include <DB/Core/ErrorCodes.h>
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2010-06-04 18:25:25 +00:00
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#include <DB/IO/VarInt.h>
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2011-08-12 18:27:39 +00:00
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#include <DB/Columns/ColumnConst.h>
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2010-05-18 18:51:51 +00:00
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#include <DB/DataTypes/IDataTypeNumber.h>
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namespace DB
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{
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/** Реализует часть интерфейса IDataType, общую для знаковых и беззнаковых чисел переменной длины
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* - ввод и вывод в текстовом и бинарном виде.
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* Остаётся лишь чисто виртуальный метод getName().
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*
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* Параметры: FieldType - тип единичного значения, ColumnType - тип столбца со значениями.
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* (см. Core/Field.h, Columns/IColumn.h)
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*/
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template <typename FieldType, typename ColumnType>
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class IDataTypeNumberVariable : public IDataTypeNumber<FieldType>
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{
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2012-07-18 18:27:42 +00:00
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typedef IDataType::WriteCallback WriteCallback;
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2010-05-18 18:51:51 +00:00
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public:
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2010-06-04 18:25:25 +00:00
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void serializeBinary(const Field & field, WriteBuffer & ostr) const
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2010-05-18 18:51:51 +00:00
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{
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2010-06-01 14:12:28 +00:00
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writeVarT(static_cast<typename ColumnType::value_type>(boost::get<FieldType>(field)), ostr);
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2010-05-18 18:51:51 +00:00
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}
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2010-06-04 18:25:25 +00:00
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void deserializeBinary(Field & field, ReadBuffer & istr) const
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2010-05-18 18:51:51 +00:00
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{
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2010-06-04 18:25:25 +00:00
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readVarT(static_cast<typename ColumnType::value_type &>(boost::get<FieldType &>(field)), istr);
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2010-05-18 18:51:51 +00:00
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}
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2012-07-18 18:27:42 +00:00
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void serializeBinary(const IColumn & column, WriteBuffer & ostr, WriteCallback callback = WriteCallback()) const
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2010-05-18 18:51:51 +00:00
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{
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const typename ColumnType::Container_t & x = dynamic_cast<const ColumnType &>(column).getData();
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size_t size = x.size();
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2012-07-18 18:27:42 +00:00
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size_t next_callback_point = callback ? callback() : 0;
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2010-05-18 18:51:51 +00:00
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for (size_t i = 0; i < size; ++i)
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2012-07-18 18:27:42 +00:00
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{
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if (next_callback_point && i == next_callback_point)
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next_callback_point = callback();
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2010-06-01 14:12:28 +00:00
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writeVarT(x[i], ostr);
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2012-07-18 18:27:42 +00:00
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}
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2010-05-18 18:51:51 +00:00
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}
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2010-06-04 18:25:25 +00:00
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void deserializeBinary(IColumn & column, ReadBuffer & istr, size_t limit) const
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2010-05-18 18:51:51 +00:00
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{
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typename ColumnType::Container_t & x = dynamic_cast<ColumnType &>(column).getData();
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x.resize(limit);
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2011-11-06 00:59:37 +00:00
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size_t i = 0;
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while (i < limit && !istr.eof())
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2010-05-18 18:51:51 +00:00
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{
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2010-06-01 14:12:28 +00:00
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readVarT(x[i], istr);
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2011-11-06 00:59:37 +00:00
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++i;
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2010-05-18 18:51:51 +00:00
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}
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2011-11-06 00:59:37 +00:00
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x.resize(i);
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2010-05-18 18:51:51 +00:00
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}
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2011-08-09 19:19:00 +00:00
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ColumnPtr createColumn() const
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2010-05-18 18:51:51 +00:00
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{
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return new ColumnType;
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}
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2011-08-12 18:27:39 +00:00
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ColumnPtr createConstColumn(size_t size, const Field & field) const
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{
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return new ColumnConst<FieldType>(size, boost::get<FieldType>(field));
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}
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2010-05-18 18:51:51 +00:00
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};
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}
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