greenplumn CParseHandlerScalarSwitch 代码
文件路径：/src/backend/gporca/libnaucrates/src/parser/CParseHandlerScalarSwitch.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CParseHandlerScalarSwitch.cpp
/
/ @doc:
/
/ Implementation of the SAX parse handler class for a Switch operator
/---------------------------------------------------------------------------
#include "naucrates/dxl/parser/CParseHandlerScalarSwitch.h"
#include "naucrates/dxl/CDXLUtils.h"
#include "naucrates/dxl/operators/CDXLOperatorFactory.h"
#include "naucrates/dxl/parser/CParseHandlerFactory.h"
#include "naucrates/dxl/parser/CParseHandlerScalarSwitchCase.h"
using namespace gpdxl;
XERCES_CPP_NAMESPACE_USE
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerScalarSwitch::CParseHandlerScalarSwitch
/
/ @doc:
/ Ctor
/
/---------------------------------------------------------------------------
CParseHandlerScalarSwitch::CParseHandlerScalarSwitch(
CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root)
: CParseHandlerScalarOp(mp, parse_handler_mgr, parse_handler_root),
m_mdid_type(nullptr),
m_arg_processed(false),
m_default_val_processed(false)
{
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerScalarSwitch::StartElement
/
/ @doc:
/ Processes a Xerces start element event
/
/---------------------------------------------------------------------------
void
CParseHandlerScalarSwitch::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(EdxltokenScalarSwitch),
element_local_name) &&
nullptr == m_mdid_type)
{
/ parse type id
m_mdid_type = CDXLOperatorFactory::ExtractConvertAttrValueToMdId(
m_parse_handler_mgr->GetDXLMemoryManager(), attrs, EdxltokenTypeId,
EdxltokenScalarSwitch);
/ construct node
CDXLScalarSwitch *dxl_op =
GPOS_NEW(m_mp) CDXLScalarSwitch(m_mp, m_mdid_type);
m_dxl_node = GPOS_NEW(m_mp) CDXLNode(m_mp, dxl_op);
}
else if (0 == XMLString::compareString(
CDXLTokens::XmlstrToken(EdxltokenScalarSwitchCase),
element_local_name))
{
/ we must have already seen the arg child, but have not seen the DEFAULT child
GPOS_ASSERT(nullptr != m_dxl_node && m_arg_processed &&
!m_default_val_processed);
/ parse case
CParseHandlerBase *parse_handler_case =
CParseHandlerFactory::GetParseHandler(
m_mp, CDXLTokens::XmlstrToken(EdxltokenScalarSwitchCase),
m_parse_handler_mgr, this);
m_parse_handler_mgr->ActivateParseHandler(parse_handler_case);
/ store parse handlers
this->Append(parse_handler_case);
parse_handler_case->startElement(element_uri, element_local_name,
element_qname, attrs);
}
else
{
GPOS_ASSERT(nullptr != m_dxl_node && !m_default_val_processed);
/ 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);
if (!m_arg_processed)
{
/ this child was the arg child
m_arg_processed = true;
}
else
{
/ that was the default expr child
m_default_val_processed = true;
}
}
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerScalarSwitch::EndElement
/
/ @doc:
/ Invoked by Xerces to process a closing tag
/
/---------------------------------------------------------------------------
void
CParseHandlerScalarSwitch::EndElement(const XMLCh *const, / element_uri
const XMLCh *const element_local_name,
const XMLCh *const / element_qname
)
{
if (0 !=
XMLString::compareString(CDXLTokens::XmlstrToken(EdxltokenScalarSwitch),
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);
for (ULONG ul = 0; ul < arity; ul++)
{
CParseHandlerScalarOp *child_parse_handler =
dynamic_cast<CParseHandlerScalarOp *>((*this)[ul]);
AddChildFromParseHandler(child_parse_handler);
}
/ deactivate handler
m_parse_handler_mgr->DeactivateHandler();
}
/EOF
相关信息
相关文章
greenplumn CParseHandlerAgg 源码
greenplumn CParseHandlerAppend 源码
greenplumn CParseHandlerArray 源码
greenplumn CParseHandlerAssert 源码
greenplumn CParseHandlerBase 源码
greenplumn CParseHandlerBroadcastMotion 源码
greenplumn CParseHandlerCTEConfig 源码
greenplumn CParseHandlerCTEList 源码