greenplumn CParseHandlerHashExprList 代码
文件路径：/src/backend/gporca/libnaucrates/src/parser/CParseHandlerHashExprList.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2010 Greenplum, Inc.
/
/ @filename:
/ CParseHandlerHashExprList.cpp
/
/ @doc:
/ Implementation of the SAX parse handler class for parsing hash expression lists.
/---------------------------------------------------------------------------
#include "naucrates/dxl/parser/CParseHandlerHashExprList.h"
#include "naucrates/dxl/operators/CDXLOperatorFactory.h"
#include "naucrates/dxl/operators/CDXLScalarHashExprList.h"
#include "naucrates/dxl/operators/CDXLScalarProjList.h"
#include "naucrates/dxl/parser/CParseHandlerFactory.h"
#include "naucrates/dxl/parser/CParseHandlerHashExpr.h"
#include "naucrates/dxl/parser/CParseHandlerScalarOp.h"
using namespace gpdxl;
XERCES_CPP_NAMESPACE_USE
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerHashExprList::CParseHandlerHashExprList
/
/ @doc:
/ Constructor
/
/---------------------------------------------------------------------------
CParseHandlerHashExprList::CParseHandlerHashExprList(
CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root)
: CParseHandlerScalarOp(mp, parse_handler_mgr, parse_handler_root)
{
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerHashExprList::StartElement
/
/ @doc:
/ Invoked by Xerces to process an opening tag
/
/---------------------------------------------------------------------------
void
CParseHandlerHashExprList::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(EdxltokenScalarHashExprList),
element_local_name))
{
/ start the hash expr list
m_dxl_node = GPOS_NEW(m_mp)
CDXLNode(m_mp, GPOS_NEW(m_mp) CDXLScalarHashExprList(m_mp));
}
else if (0 == XMLString::compareString(
CDXLTokens::XmlstrToken(EdxltokenScalarHashExpr),
element_local_name))
{
/ we must have seen a hash expr list already and initialized the hash expr list node
GPOS_ASSERT(nullptr != m_dxl_node);
/ start new hash expr element
CParseHandlerBase *hash_expr_parse_handler =
CParseHandlerFactory::GetParseHandler(
m_mp, CDXLTokens::XmlstrToken(EdxltokenScalarHashExpr),
m_parse_handler_mgr, this);
m_parse_handler_mgr->ActivateParseHandler(hash_expr_parse_handler);
/ store parse handler
this->Append(hash_expr_parse_handler);
hash_expr_parse_handler->startElement(element_uri, element_local_name,
element_qname, attrs);
}
else
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerHashExprList::EndElement
/
/ @doc:
/ Invoked by Xerces to process a closing tag
/
/---------------------------------------------------------------------------
void
CParseHandlerHashExprList::EndElement(const XMLCh *const, / element_uri,
const XMLCh *const element_local_name,
const XMLCh *const / element_qname
)
{
if (0 != XMLString::compareString(
CDXLTokens::XmlstrToken(EdxltokenScalarHashExprList),
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 length = this->Length();
/ add hash expressions from child parse handlers
for (ULONG ul = 0; ul < length; ul++)
{
CParseHandlerHashExpr *hash_expr_parse_handler =
dynamic_cast<CParseHandlerHashExpr *>((*this)[ul]);
AddChildFromParseHandler(hash_expr_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