greenplumn CParseHandlerScalarArrayCoerceExpr 代码
文件路径：/src/backend/gporca/libnaucrates/src/parser/CParseHandlerScalarArrayCoerceExpr.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2014 VMware, Inc. or its affiliates.
/
/ @filename:
/ CParseHandlerScalarArrayCoerceExpr.cpp
/
/ @doc:
/
/ Implementation of the SAX parse handler class for parsing scalar array coerce expression operator.
/
/ @owner:
/
/ @test:
/
/
/---------------------------------------------------------------------------
#include "naucrates/dxl/parser/CParseHandlerScalarArrayCoerceExpr.h"
#include "naucrates/dxl/CDXLUtils.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:
/ CParseHandlerScalarArrayCoerceExpr::CParseHandlerScalarArrayCoerceExpr
/
/ @doc:
/ Ctor
/
/---------------------------------------------------------------------------
CParseHandlerScalarArrayCoerceExpr::CParseHandlerScalarArrayCoerceExpr(
CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root)
: CParseHandlerScalarOp(mp, parse_handler_mgr, parse_handler_root)
{
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerScalarArrayCoerceExpr::StartElement
/
/ @doc:
/ Processes a Xerces start element event
/
/---------------------------------------------------------------------------
void
CParseHandlerScalarArrayCoerceExpr::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(EdxltokenScalarArrayCoerceExpr),
element_local_name))
{
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());
}
/ parse and create scalar coerce
CDXLScalarArrayCoerceExpr *dxl_op = (CDXLScalarArrayCoerceExpr *)
CDXLOperatorFactory::MakeDXLArrayCoerceExpr(
m_parse_handler_mgr->GetDXLMemoryManager(), attrs);
m_dxl_node = GPOS_NEW(m_mp) CDXLNode(m_mp, dxl_op);
/ parse handler for child scalar node
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);
}
else
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerScalarArrayCoerceExpr::EndElement
/
/ @doc:
/ Processes a Xerces end element event
/
/---------------------------------------------------------------------------
void
CParseHandlerScalarArrayCoerceExpr::EndElement(
const XMLCh *const, / element_uri,
const XMLCh *const element_local_name,
const XMLCh *const / element_qname
)
{
if (0 != XMLString::compareString(
CDXLTokens::XmlstrToken(EdxltokenScalarArrayCoerceExpr),
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(1 == this->Length());
/ add constructed child from child parse handlers
CParseHandlerScalarOp *child_parse_handler =
dynamic_cast<CParseHandlerScalarOp *>((*this)[0]);
AddChildFromParseHandler(child_parse_handler);
/ deactivate handler
m_parse_handler_mgr->DeactivateHandler();
}
/ EOF
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