greenplumn CParseHandlerMetadataColumns 源码
greenplumn CParseHandlerMetadataColumns 代码
文件路径:/src/backend/gporca/libnaucrates/src/parser/CParseHandlerMetadataColumns.cpp
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 Greenplum, Inc.
//
// @filename:
// CParseHandlerMetadataColumns.cpp
//
// @doc:
// Implementation of the SAX parse handler class for parsing a list of
// columns in a relation's metadata.
//---------------------------------------------------------------------------
#include "naucrates/dxl/parser/CParseHandlerMetadataColumns.h"
#include "naucrates/dxl/operators/CDXLOperatorFactory.h"
#include "naucrates/dxl/parser/CParseHandlerFactory.h"
#include "naucrates/dxl/parser/CParseHandlerManager.h"
#include "naucrates/dxl/parser/CParseHandlerMetadataColumn.h"
using namespace gpdxl;
XERCES_CPP_NAMESPACE_USE
//---------------------------------------------------------------------------
// @function:
// CParseHandlerMetadataColumns::CParseHandlerMetadataColumns
//
// @doc:
// Constructor
//
//---------------------------------------------------------------------------
CParseHandlerMetadataColumns::CParseHandlerMetadataColumns(
CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root)
: CParseHandlerBase(mp, parse_handler_mgr, parse_handler_root),
m_md_col_array(nullptr)
{
}
//---------------------------------------------------------------------------
// @function:
// CParseHandlerMetadataColumns::~CParseHandlerMetadataColumns
//
// @doc:
// Destructor
//
//---------------------------------------------------------------------------
CParseHandlerMetadataColumns::~CParseHandlerMetadataColumns()
{
CRefCount::SafeRelease(m_md_col_array);
}
//---------------------------------------------------------------------------
// @function:
// CParseHandlerMetadataColumns::StartElement
//
// @doc:
// Invoked by Xerces to process an opening tag
//
//---------------------------------------------------------------------------
void
CParseHandlerMetadataColumns::StartElement(
const XMLCh *const element_uri, const XMLCh *const element_local_name,
const XMLCh *const element_qname, const Attributes &attrs)
{
if (0 == XMLString::compareString(CDXLTokens::XmlstrToken(EdxltokenColumns),
element_local_name))
{
// start of a columns' list
GPOS_ASSERT(nullptr == m_md_col_array);
m_md_col_array = GPOS_NEW(m_mp) CMDColumnArray(m_mp);
}
else if (0 ==
XMLString::compareString(CDXLTokens::XmlstrToken(EdxltokenColumn),
element_local_name))
{
// column list must be initialized already
GPOS_ASSERT(nullptr != m_md_col_array);
// activate parse handler to parse the column info
CParseHandlerBase *col_parse_handler =
CParseHandlerFactory::GetParseHandler(
m_mp, CDXLTokens::XmlstrToken(EdxltokenMetadataColumn),
m_parse_handler_mgr, this);
m_parse_handler_mgr->ActivateParseHandler(col_parse_handler);
this->Append(col_parse_handler);
col_parse_handler->startElement(element_uri, element_local_name,
element_qname, attrs);
}
else
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
}
//---------------------------------------------------------------------------
// @function:
// CParseHandlerMetadataColumns::EndElement
//
// @doc:
// Invoked by Xerces to process a closing tag
//
//---------------------------------------------------------------------------
void
CParseHandlerMetadataColumns::EndElement(const XMLCh *const, // element_uri,
const XMLCh *const element_local_name,
const XMLCh *const // element_qname
)
{
if (0 == XMLString::compareString(CDXLTokens::XmlstrToken(EdxltokenColumns),
element_local_name))
{
// end of the columns' list
GPOS_ASSERT(nullptr != m_md_col_array);
const ULONG size = this->Length();
// add parsed columns to the list
for (ULONG ul = 0; ul < size; ul++)
{
CParseHandlerMetadataColumn *md_col_parse_handler =
dynamic_cast<CParseHandlerMetadataColumn *>((*this)[ul]);
GPOS_ASSERT(nullptr != md_col_parse_handler->GetMdCol());
CMDColumn *md_col = md_col_parse_handler->GetMdCol();
md_col->AddRef();
m_md_col_array->Append(md_col);
}
// deactivate handler
m_parse_handler_mgr->DeactivateHandler();
}
else
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
}
//---------------------------------------------------------------------------
// @function:
// CParseHandlerMetadataColumns::GetMdColArray
//
// @doc:
// Return the constructed list of metadata columns
//
//---------------------------------------------------------------------------
CMDColumnArray *
CParseHandlerMetadataColumns::GetMdColArray()
{
return m_md_col_array;
}
// EOF
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