greenplumn CParseHandlerScalarNullIf 代码
文件路径：/src/backend/gporca/libnaucrates/src/parser/CParseHandlerScalarNullIf.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CParseHandlerScalarNullIf.cpp
/
/ @doc:
/ Implementation of the SAX parse handler class for scalar NullIf
/---------------------------------------------------------------------------
#include "naucrates/dxl/parser/CParseHandlerScalarNullIf.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:
/ CParseHandlerScalarNullIf::CParseHandlerScalarNullIf
/
/ @doc:
/ Constructor
/
/---------------------------------------------------------------------------
CParseHandlerScalarNullIf::CParseHandlerScalarNullIf(
CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root)
: CParseHandlerScalarOp(mp, parse_handler_mgr, parse_handler_root)
{
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerScalarNullIf::StartElement
/
/ @doc:
/ Processes a Xerces start element event
/
/---------------------------------------------------------------------------
void
CParseHandlerScalarNullIf::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(EdxltokenScalarNullIf),
element_local_name))
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
IMDId *mdid_op = CDXLOperatorFactory::ExtractConvertAttrValueToMdId(
m_parse_handler_mgr->GetDXLMemoryManager(), attrs, EdxltokenOpNo,
EdxltokenScalarNullIf);
IMDId *mdid_return_type =
CDXLOperatorFactory::ExtractConvertAttrValueToMdId(
m_parse_handler_mgr->GetDXLMemoryManager(), attrs, EdxltokenTypeId,
EdxltokenScalarNullIf);
m_dxl_node = GPOS_NEW(m_mp) CDXLNode(
m_mp, GPOS_NEW(m_mp) CDXLScalarNullIf(m_mp, mdid_op, mdid_return_type));
/ create and activate the parse handler for the children nodes in reverse
/ order of their expected appearance
/ parse handler for right scalar node
CParseHandlerBase *right_child_parse_handler =
CParseHandlerFactory::GetParseHandler(
m_mp, CDXLTokens::XmlstrToken(EdxltokenScalar), m_parse_handler_mgr,
this);
m_parse_handler_mgr->ActivateParseHandler(right_child_parse_handler);
/ parse handler for left scalar node
CParseHandlerBase *left_child_parse_handler =
CParseHandlerFactory::GetParseHandler(
m_mp, CDXLTokens::XmlstrToken(EdxltokenScalar), m_parse_handler_mgr,
this);
m_parse_handler_mgr->ActivateParseHandler(left_child_parse_handler);
/ store parse handlers
this->Append(left_child_parse_handler);
this->Append(right_child_parse_handler);
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerScalarNullIf::EndElement
/
/ @doc:
/ Processes a Xerces end element event
/
/---------------------------------------------------------------------------
void
CParseHandlerScalarNullIf::EndElement(const XMLCh *const, / element_uri,
const XMLCh *const element_local_name,
const XMLCh *const / element_qname
)
{
if (0 !=
XMLString::compareString(CDXLTokens::XmlstrToken(EdxltokenScalarNullIf),
element_local_name))
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
CParseHandlerScalarOp *left_child_parse_handler =
dynamic_cast<CParseHandlerScalarOp *>((*this)[0]);
CParseHandlerScalarOp *right_child_parse_handler =
dynamic_cast<CParseHandlerScalarOp *>((*this)[1]);
/ add constructed children
AddChildFromParseHandler(left_child_parse_handler);
AddChildFromParseHandler(right_child_parse_handler);
/ deactivate handler
m_parse_handler_mgr->DeactivateHandler();
}
/ EOF
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