greenplumn CParseHandlerLogicalCTEAnchor 代码
文件路径：/src/backend/gporca/libnaucrates/src/parser/CParseHandlerLogicalCTEAnchor.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CParseHandlerLogicalCTEAnchor.cpp
/
/ @doc:
/ Implementation of the SAX parse handler class for parsing CTE anchor
/ operators
/---------------------------------------------------------------------------
#include "naucrates/dxl/parser/CParseHandlerLogicalCTEAnchor.h"
#include "naucrates/dxl/operators/CDXLLogicalCTEAnchor.h"
#include "naucrates/dxl/operators/CDXLOperatorFactory.h"
#include "naucrates/dxl/parser/CParseHandlerFactory.h"
using namespace gpdxl;
XERCES_CPP_NAMESPACE_USE
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerLogicalCTEAnchor::CParseHandlerLogicalCTEAnchor
/
/ @doc:
/ Ctor
/
/---------------------------------------------------------------------------
CParseHandlerLogicalCTEAnchor::CParseHandlerLogicalCTEAnchor(
CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root)
: CParseHandlerLogicalOp(mp, parse_handler_mgr, parse_handler_root)
{
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerLogicalCTEAnchor::StartElement
/
/ @doc:
/ Invoked by Xerces to process an opening tag
/
/---------------------------------------------------------------------------
void
CParseHandlerLogicalCTEAnchor::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(EdxltokenLogicalCTEAnchor),
element_local_name))
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
/ parse cteid and create cte operator
ULONG id = CDXLOperatorFactory::ExtractConvertAttrValueToUlong(
m_parse_handler_mgr->GetDXLMemoryManager(), attrs, EdxltokenCTEId,
EdxltokenLogicalCTEAnchor);
m_dxl_node = GPOS_NEW(m_mp)
CDXLNode(m_mp, GPOS_NEW(m_mp) CDXLLogicalCTEAnchor(m_mp, id));
/ create and activate the parse handler for the child expression node
CParseHandlerBase *child_parse_handler =
CParseHandlerFactory::GetParseHandler(
m_mp, CDXLTokens::XmlstrToken(EdxltokenLogical),
m_parse_handler_mgr, this);
m_parse_handler_mgr->ActivateParseHandler(child_parse_handler);
/ store parse handler
this->Append(child_parse_handler);
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerLogicalCTEAnchor::EndElement
/
/ @doc:
/ Invoked by Xerces to process a closing tag
/
/---------------------------------------------------------------------------
void
CParseHandlerLogicalCTEAnchor::EndElement(const XMLCh *const, / element_uri,
const XMLCh *const element_local_name,
const XMLCh *const / element_qname
)
{
if (0 != XMLString::compareString(
CDXLTokens::XmlstrToken(EdxltokenLogicalCTEAnchor),
element_local_name))
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
GPOS_ASSERT(nullptr != m_dxl_node);
CParseHandlerLogicalOp *child_parse_handler =
dynamic_cast<CParseHandlerLogicalOp *>((*this)[0]);
AddChildFromParseHandler(child_parse_handler);
#ifdef GPOS_DEBUG
m_dxl_node->GetOperator()->AssertValid(m_dxl_node,
false /* validate_children */);
#endif / GPOS_DEBUG
m_parse_handler_mgr->DeactivateHandler();
}
/ EOF
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