greenplumn CParseHandlerManager 源码
greenplumn CParseHandlerManager 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/parser/CParseHandlerManager.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2010 Greenplum, Inc.
//
// @filename:
// CParseHandlerManager.h
//
// @doc:
// Class for managing the creation and installation of parse handlers.
// The class serves as a factory for creating parse handler objects, and
// for switching between parse handlers during parsing.
//---------------------------------------------------------------------------
#ifndef GPDXL_CParseHandlerManager_H
#define GPDXL_CParseHandlerManager_H
#include <xercesc/sax2/SAX2XMLReader.hpp>
#include "gpos/base.h"
#include "gpos/common/CStack.h"
#include "naucrates/dxl/parser/CParseHandlerBase.h"
namespace gpdxl
{
using namespace gpos;
// fwd decl
class CParseHandlerPhysicalOp;
class CDXLMemoryManager;
// stack of parse handlers
using ParseHandlerStack = CStack<CParseHandlerBase>;
//---------------------------------------------------------------------------
// @class:
// CParseHandlerManager
//
// @doc:
// Manages the creation, activation and deactivation of parse handlers
//
//
//---------------------------------------------------------------------------
class CParseHandlerManager
{
private:
// the memory manager used for parsing the current document
CDXLMemoryManager *m_dxl_memory_manager;
// parser object responsible for parsing the current XML document
SAX2XMLReader *m_xml_reader;
// current parse handler
CParseHandlerBase *m_curr_parse_handler;
// stack of parse handlers
ParseHandlerStack *m_parse_handler_stack;
// steps since last check for aborts
ULONG m_iteration_since_last_abortcheck;
// check for aborts at regular intervals
void CheckForAborts();
public:
CParseHandlerManager(const CParseHandlerManager &) = delete;
// ctor/dtor
CParseHandlerManager(CDXLMemoryManager *, SAX2XMLReader *);
~CParseHandlerManager();
// returns the current memory manager
CDXLMemoryManager *
GetDXLMemoryManager()
{
return m_dxl_memory_manager;
}
// activation and deactivation of parsers
// Gives parsing control to the specified handler. When the handler
// exits (by calling Deactivate), control will be returned to the handler,
// which was active before the function was invoked.
void ActivateParseHandler(CParseHandlerBase *);
// Replaces current parse handler with the specified one. When the new
// handler exits, control goes to the handler active before the one replaced
// with this function call.
void ReplaceHandler(CParseHandlerBase *parse_handler_new,
CParseHandlerBase *parse_handler_root);
// Deactivates current handler and returns control to the previously active one.
void DeactivateHandler();
// Returns the current parse handler if one exists; used for debugging purposes
const CParseHandlerBase *GetCurrentParseHandler();
};
} // namespace gpdxl
#endif // !GPDXL_CParseHandlerManager_H
// EOF
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