greenplumn CParseHandlerScalarWindowFrameEdge 代码
文件路径：/src/backend/gporca/libnaucrates/src/parser/CParseHandlerScalarWindowFrameEdge.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CParseHandlerScalarWindowFrameEdge.cpp
/
/ @doc:
/ Implementation of the SAX parse handler class for parsing a window frame
/ edge
/---------------------------------------------------------------------------
#include "naucrates/dxl/parser/CParseHandlerScalarWindowFrameEdge.h"
#include "naucrates/dxl/operators/CDXLOperatorFactory.h"
#include "naucrates/dxl/parser/CParseHandlerFactory.h"
#include "naucrates/dxl/parser/CParseHandlerScalarOp.h"
using namespace gpdxl;
XERCES_CPP_NAMESPACE_USE
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerScalarWindowFrameEdge::CParseHandlerScalarWindowFrameEdge
/
/ @doc:
/ Ctor
/
/---------------------------------------------------------------------------
CParseHandlerScalarWindowFrameEdge::CParseHandlerScalarWindowFrameEdge(
CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root)
: CParseHandlerScalarOp(mp, parse_handler_mgr, parse_handler_root)
{
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerScalarWindowFrameEdge::StartElement
/
/ @doc:
/ Invoked by Xerces to process an opening tag
/
/---------------------------------------------------------------------------
void
CParseHandlerScalarWindowFrameEdge::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(EdxltokenScalarWindowFrameLeadingEdge),
element_local_name))
{
GPOS_ASSERT(nullptr == m_dxl_node);
EdxlFrameBoundary dxl_frame_bound =
CDXLOperatorFactory::ParseDXLFrameBoundary(
attrs, EdxltokenWindowLeadingBoundary);
m_dxl_node = GPOS_NEW(m_mp)
CDXLNode(m_mp, GPOS_NEW(m_mp) CDXLScalarWindowFrameEdge(
m_mp, true /*fLeading*/, dxl_frame_bound));
}
else if (0 == XMLString::compareString(
CDXLTokens::XmlstrToken(
EdxltokenScalarWindowFrameTrailingEdge),
element_local_name))
{
GPOS_ASSERT(nullptr == m_dxl_node);
EdxlFrameBoundary dxl_frame_bound =
CDXLOperatorFactory::ParseDXLFrameBoundary(
attrs, EdxltokenWindowTrailingBoundary);
m_dxl_node = GPOS_NEW(m_mp)
CDXLNode(m_mp, GPOS_NEW(m_mp) CDXLScalarWindowFrameEdge(
m_mp, false /*fLeading*/, dxl_frame_bound));
}
else
{
/ we must have seen a Window Frame Edge already and initialized its corresponding node
if (nullptr == m_dxl_node)
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
/ install a scalar element parser for parsing the frame edge value
CParseHandlerBase *child_parse_handler =
CParseHandlerFactory::GetParseHandler(
m_mp, CDXLTokens::XmlstrToken(EdxltokenScalar),
m_parse_handler_mgr, this);
m_parse_handler_mgr->ActivateParseHandler(child_parse_handler);
/ store parse handler
this->Append(child_parse_handler);
child_parse_handler->startElement(element_uri, element_local_name,
element_qname, attrs);
}
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerScalarWindowFrameEdge::EndElement
/
/ @doc:
/ Processes a Xerces end element event
/
/---------------------------------------------------------------------------
void
CParseHandlerScalarWindowFrameEdge::EndElement(
const XMLCh *const, / element_uri,
const XMLCh *const element_local_name,
const XMLCh *const / element_qname
)
{
if (0 == XMLString::compareString(
CDXLTokens::XmlstrToken(EdxltokenScalarWindowFrameLeadingEdge),
element_local_name) ||
0 ==
XMLString::compareString(
CDXLTokens::XmlstrToken(EdxltokenScalarWindowFrameTrailingEdge),
element_local_name))
{
const ULONG arity = this->Length();
if (0 < arity)
{
GPOS_ASSERT(1 == arity);
/ limit count node was not empty
CParseHandlerScalarOp *child_parse_handler =
dynamic_cast<CParseHandlerScalarOp *>((*this)[0]);
AddChildFromParseHandler(child_parse_handler);
}
/ 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());
}
}
/ EOF
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