greenplumn CWStringDynamic 源码
greenplumn CWStringDynamic 代码
文件路径：/src/backend/gporca/libgpos/include/gpos/string/CWStringDynamic.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2010 Greenplum, Inc.
//
// @filename:
// CWStringDynamic.h
//
// @doc:
// Wide character string class with dynamic buffer allocation.
//---------------------------------------------------------------------------
#ifndef GPOS_CWStringDynamic_H
#define GPOS_CWStringDynamic_H
#include "gpos/memory/CMemoryPoolManager.h"
#include "gpos/string/CWString.h"
#define GPOS_WSTR_DYNAMIC_CAPACITY_INIT (1 << 7)
#define GPOS_WSTR_DYNAMIC_STATIC_BUFFER (1 << 10)
namespace gpos
{
//---------------------------------------------------------------------------
// @class:
// CWStringDynamic
//
// @doc:
// Implementation of the string interface with dynamic buffer allocation.
// This CWStringDynamic class dynamically allocates memory when constructing a new
// string, or when modifying a string. The memory is released at destruction time
// or when the string is reset.
//
//---------------------------------------------------------------------------
class CWStringDynamic : public CWString
{
private:
// string memory pool used for allocating new memory for the string
CMemoryPool *m_mp;
// string capacity
ULONG m_capacity;
// increase string capacity
void IncreaseCapacity(ULONG requested);
// find capacity that fits requested string size
static ULONG Capacity(ULONG requested);
protected:
// appends the contents of a buffer to the current string
void AppendBuffer(const WCHAR *w_str_buffer) override;
public:
CWStringDynamic(const CWStringDynamic &) = delete;
// ctor
CWStringDynamic(CMemoryPool *mp);
// ctor - copies passed string
CWStringDynamic(CMemoryPool *mp, const WCHAR *w_str_buffer);
// appends a string and replaces character with string
void AppendEscape(const CWStringBase *str, WCHAR wc,
const WCHAR *w_str_replace) override;
// appends a formatted string
void AppendFormat(const WCHAR *format, ...) override;
// appends a null terminated character array
void AppendCharArray(const CHAR *sz) override;
// appends a null terminated wide character array
void AppendWideCharArray(const WCHAR *w_str) override;
// dtor
~CWStringDynamic() override;
// resets string
void Reset() override;
};
} // namespace gpos
#endif // !GPOS_CWStringDynamic_H
// EOF
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