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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