greenplumn CParseHandlerMetadata 源码
greenplumn CParseHandlerMetadata 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/parser/CParseHandlerMetadata.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2010 Greenplum, Inc.
//
// @filename:
// CParseHandlerMetadata.h
//
// @doc:
// SAX parse handler class for parsing metadata from a DXL document.
//---------------------------------------------------------------------------
#ifndef GPDXL_CParseHandlerMetadata_H
#define GPDXL_CParseHandlerMetadata_H
#include "gpos/base.h"
#include "naucrates/dxl/parser/CParseHandlerBase.h"
#include "naucrates/dxl/xml/dxltokens.h"
#include "naucrates/md/IMDCacheObject.h"
namespace gpdxl
{
using namespace gpos;
using namespace gpmd;
using namespace gpnaucrates;
XERCES_CPP_NAMESPACE_USE
//---------------------------------------------------------------------------
// @class:
// CParseHandlerMetadata
//
// @doc:
// Parse handler for metadata.
//
//---------------------------------------------------------------------------
class CParseHandlerMetadata : public CParseHandlerBase
{
private:
// list of parsed metadata objects
IMDCacheObjectArray *m_mdid_cached_obj_array;
// list of parsed mdids
IMdIdArray *m_mdid_array;
// list of parsed metatadata source system ids
CSystemIdArray *m_system_id_array;
// process the start of an element
void StartElement(
const XMLCh *const element_uri, // URI of element's namespace
const XMLCh *const element_local_name, // local part of element's name
const XMLCh *const element_qname, // element's qname
const Attributes &attr // element's attributes
) override;
// process the end of an element
void EndElement(
const XMLCh *const element_uri, // URI of element's namespace
const XMLCh *const element_local_name, // local part of element's name
const XMLCh *const element_qname // element's qname
) override;
// parse an array of system ids from the XML attributes
CSystemIdArray *GetSrcSysIdArray(const Attributes &attr,
Edxltoken target_attr,
Edxltoken target_elem);
public:
CParseHandlerMetadata(const CParseHandlerMetadata &) = delete;
// ctor
CParseHandlerMetadata(CMemoryPool *mp,
CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root);
// dtor
~CParseHandlerMetadata() override;
// parse hander type
EDxlParseHandlerType GetParseHandlerType() const override;
// return the list of parsed metadata objects
IMDCacheObjectArray *GetMdIdCachedObjArray();
// return the list of parsed mdids
IMdIdArray *GetMdIdArray();
// return the list of parsed system ids
CSystemIdArray *GetSysidPtrArray();
};
} // namespace gpdxl
#endif // !GPDXL_CParseHandlerMetadata_H
// EOF
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