greenplumn CParseHandlerScalarOpExpr 代码
文件路径：/src/backend/gporca/libnaucrates/src/parser/CParseHandlerScalarOpExpr.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2010 Greenplum, Inc.
/
/ @filename:
/ CParseHandlerScalarOpExpr.cpp
/
/ @doc:
/
/ Implementation of the SAX parse handler class for parsing scalar OpExpr.
/---------------------------------------------------------------------------
#include "naucrates/dxl/parser/CParseHandlerScalarOpExpr.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:
/ CParseHandlerScalarOpExpr::CParseHandlerScalarOpExpr
/
/ @doc:
/ Constructor
/
/---------------------------------------------------------------------------
CParseHandlerScalarOpExpr::CParseHandlerScalarOpExpr(
CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root)
: CParseHandlerScalarOp(mp, parse_handler_mgr, parse_handler_root),
m_num_of_children(0)
{
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerScalarOpExpr::StartElement
/
/ @doc:
/ Processes a Xerces start element event
/
/---------------------------------------------------------------------------
void
CParseHandlerScalarOpExpr::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(EdxltokenScalarOpExpr),
element_local_name) &&
(nullptr == m_dxl_node))
{
/ parse and create scalar OpExpr
CDXLScalarOpExpr *dxl_op =
(CDXLScalarOpExpr *) CDXLOperatorFactory::MakeDXLOpExpr(
m_parse_handler_mgr->GetDXLMemoryManager(), attrs);
/ construct node from the created child nodes
m_dxl_node = GPOS_NEW(m_mp) CDXLNode(m_mp, dxl_op);
}
else if (nullptr != m_dxl_node)
{
if (2 > m_num_of_children)
{
CParseHandlerBase *op_parse_handler =
CParseHandlerFactory::GetParseHandler(
m_mp, CDXLTokens::XmlstrToken(EdxltokenScalar),
m_parse_handler_mgr, this);
m_parse_handler_mgr->ActivateParseHandler(op_parse_handler);
/ store parse handlers
this->Append(op_parse_handler);
op_parse_handler->startElement(element_uri, element_local_name,
element_qname, attrs);
m_num_of_children++;
}
else
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
}
else
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLIncorrectNumberOfChildren,
str->GetBuffer());
}
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerScalarOpExpr::EndElement
/
/ @doc:
/ Processes a Xerces end element event
/
/---------------------------------------------------------------------------
void
CParseHandlerScalarOpExpr::EndElement(const XMLCh *const, / element_uri,
const XMLCh *const element_local_name,
const XMLCh *const / element_qname
)
{
if (0 !=
XMLString::compareString(CDXLTokens::XmlstrToken(EdxltokenScalarOpExpr),
element_local_name))
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
const ULONG arity = this->Length();
GPOS_ASSERT(1 == arity || 2 == arity);
/ add constructed children from child parse handlers
for (ULONG ul = 0; ul < arity; ul++)
{
CParseHandlerScalarOp *op_parse_handler =
dynamic_cast<CParseHandlerScalarOp *>((*this)[ul]);
AddChildFromParseHandler(op_parse_handler);
}
/ deactivate handler
m_parse_handler_mgr->DeactivateHandler();
}
/ EOF
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