greenplumn CParseHandlerScalarCoerceViaIO 源码
greenplumn CParseHandlerScalarCoerceViaIO 代码
文件路径:/src/backend/gporca/libnaucrates/src/parser/CParseHandlerScalarCoerceViaIO.cpp
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2014 VMware, Inc. or its affiliates.
//
// @filename:
// CParseHandlerScalarCoerceViaIO.cpp
//
// @doc:
//
// Implementation of the SAX parse handler class for parsing scalar coerce operator.
//
// @owner:
//
// @test:
//
//
//---------------------------------------------------------------------------
#include "naucrates/dxl/parser/CParseHandlerScalarCoerceViaIO.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:
// CParseHandlerScalarCoerceViaIO::CParseHandlerScalarCoerceViaIO
//
// @doc:
// Ctor
//
//---------------------------------------------------------------------------
CParseHandlerScalarCoerceViaIO::CParseHandlerScalarCoerceViaIO(
CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root)
: CParseHandlerScalarOp(mp, parse_handler_mgr, parse_handler_root)
{
}
//---------------------------------------------------------------------------
// @function:
// CParseHandlerScalarCoerceViaIO::StartElement
//
// @doc:
// Processes a Xerces start element event
//
//---------------------------------------------------------------------------
void
CParseHandlerScalarCoerceViaIO::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(EdxltokenScalarCoerceViaIO),
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
CDXLScalarCoerceViaIO *dxl_op =
(CDXLScalarCoerceViaIO *) CDXLOperatorFactory::MakeDXLCoerceViaIO(
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:
// CParseHandlerScalarCoerceViaIO::EndElement
//
// @doc:
// Processes a Xerces end element event
//
//---------------------------------------------------------------------------
void
CParseHandlerScalarCoerceViaIO::EndElement(
const XMLCh *const, // element_uri,
const XMLCh *const element_local_name,
const XMLCh *const // element_qname
)
{
if (0 != XMLString::compareString(
CDXLTokens::XmlstrToken(EdxltokenScalarCoerceViaIO),
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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