greenplumn CParseHandlerScalarCoalesce 代码
文件路径：/src/backend/gporca/libnaucrates/src/parser/CParseHandlerScalarCoalesce.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CParseHandlerScalarCoalesce.cpp
/
/ @doc:
/
/ Implementation of the SAX parse handler class for a coalesce operator
/---------------------------------------------------------------------------
#include "naucrates/dxl/parser/CParseHandlerScalarCoalesce.h"
#include "naucrates/dxl/CDXLUtils.h"
#include "naucrates/dxl/operators/CDXLOperatorFactory.h"
#include "naucrates/dxl/parser/CParseHandlerFactory.h"
using namespace gpdxl;
XERCES_CPP_NAMESPACE_USE
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerScalarCoalesce::CParseHandlerScalarCoalesce
/
/ @doc:
/ Ctor
/
/---------------------------------------------------------------------------
CParseHandlerScalarCoalesce::CParseHandlerScalarCoalesce(
CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root)
: CParseHandlerScalarOp(mp, parse_handler_mgr, parse_handler_root),
m_mdid_type(nullptr)
{
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerScalarCoalesce::StartElement
/
/ @doc:
/ Processes a Xerces start element event
/
/---------------------------------------------------------------------------
void
CParseHandlerScalarCoalesce::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(EdxltokenScalarCoalesce),
element_local_name) &&
nullptr == m_mdid_type)
{
/ parse type id
m_mdid_type = CDXLOperatorFactory::ExtractConvertAttrValueToMdId(
m_parse_handler_mgr->GetDXLMemoryManager(), attrs, EdxltokenTypeId,
EdxltokenScalarCoalesce);
}
else
{
/ parse scalar child
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 handlers
this->Append(child_parse_handler);
child_parse_handler->startElement(element_uri, element_local_name,
element_qname, attrs);
}
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerScalarCoalesce::EndElement
/
/ @doc:
/ Invoked by Xerces to process a closing tag
/
/---------------------------------------------------------------------------
void
CParseHandlerScalarCoalesce::EndElement(const XMLCh *const, / element_uri
const XMLCh *const element_local_name,
const XMLCh *const / element_qname
)
{
if (0 != XMLString::compareString(
CDXLTokens::XmlstrToken(EdxltokenScalarCoalesce),
element_local_name))
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
/ construct node
m_dxl_node = GPOS_NEW(m_mp)
CDXLNode(m_mp, GPOS_NEW(m_mp) CDXLScalarCoalesce(m_mp, m_mdid_type));
/ loop over children and add them to this parsehandler
const ULONG size = this->Length();
for (ULONG idx = 0; idx < size; idx++)
{
CParseHandlerScalarOp *child_parse_handler =
dynamic_cast<CParseHandlerScalarOp *>((*this)[idx]);
AddChildFromParseHandler(child_parse_handler);
}
/ deactivate handler
m_parse_handler_mgr->DeactivateHandler();
}
/EOF
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