greenplumn CParseHandlerScalarIfStmt 代码
文件路径：/src/backend/gporca/libnaucrates/src/parser/CParseHandlerScalarIfStmt.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2010 Greenplum, Inc.
/
/ @filename:
/ CParseHandlerScalarIfStmt.cpp
/
/ @doc:
/
/ Implementation of the SAX parse handler class for an if statement.
/---------------------------------------------------------------------------
#include "naucrates/dxl/parser/CParseHandlerScalarIfStmt.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:
/ CParseHandlerScalarIfStmt::CParseHandlerScalarIfStmt
/
/ @doc:
/ Constructor
/
/---------------------------------------------------------------------------
CParseHandlerScalarIfStmt::CParseHandlerScalarIfStmt(
CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root)
: CParseHandlerScalarOp(mp, parse_handler_mgr, parse_handler_root)
{
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerScalarIfStmt::StartElement
/
/ @doc:
/ Processes a Xerces start element event
/
/---------------------------------------------------------------------------
void
CParseHandlerScalarIfStmt::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(EdxltokenScalarIfStmt),
element_local_name))
{
/ parse and create scalar if statment
CDXLScalarIfStmt *dxl_op =
(CDXLScalarIfStmt *) CDXLOperatorFactory::MakeDXLIfStmt(
m_parse_handler_mgr->GetDXLMemoryManager(), attrs);
/ construct node
m_dxl_node = GPOS_NEW(m_mp) CDXLNode(m_mp, dxl_op);
/ create and activate the parse handler for the children nodes in reverse
/ order of their expected appearance
/ parse handler for handling else result expression scalar node
CParseHandlerBase *else_parse_handler =
CParseHandlerFactory::GetParseHandler(
m_mp, CDXLTokens::XmlstrToken(EdxltokenScalar),
m_parse_handler_mgr, this);
m_parse_handler_mgr->ActivateParseHandler(else_parse_handler);
/ parse handler for handling result expression scalar node
CParseHandlerBase *result_parse_handler =
CParseHandlerFactory::GetParseHandler(
m_mp, CDXLTokens::XmlstrToken(EdxltokenScalar),
m_parse_handler_mgr, this);
m_parse_handler_mgr->ActivateParseHandler(result_parse_handler);
/ parse handler for the when condition clause
CParseHandlerBase *when_cond_parse_handler =
CParseHandlerFactory::GetParseHandler(
m_mp, CDXLTokens::XmlstrToken(EdxltokenScalar),
m_parse_handler_mgr, this);
m_parse_handler_mgr->ActivateParseHandler(when_cond_parse_handler);
/ store parse handlers
this->Append(when_cond_parse_handler);
this->Append(result_parse_handler);
this->Append(else_parse_handler);
}
else
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerScalarIfStmt::EndElement
/
/ @doc:
/ Invoked by Xerces to process a closing tag
/
/---------------------------------------------------------------------------
void
CParseHandlerScalarIfStmt::EndElement(const XMLCh *const, / element_uri
const XMLCh *const element_local_name,
const XMLCh *const / element_qname
)
{
if (0 !=
XMLString::compareString(CDXLTokens::XmlstrToken(EdxltokenScalarIfStmt),
element_local_name))
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
CParseHandlerScalarOp *when_cond_parse_handler =
dynamic_cast<CParseHandlerScalarOp *>((*this)[0]);
CParseHandlerScalarOp *result_parse_handler =
dynamic_cast<CParseHandlerScalarOp *>((*this)[1]);
CParseHandlerScalarOp *else_parse_handler =
dynamic_cast<CParseHandlerScalarOp *>((*this)[2]);
/ add constructed children
AddChildFromParseHandler(when_cond_parse_handler);
AddChildFromParseHandler(result_parse_handler);
AddChildFromParseHandler(else_parse_handler);
/ deactivate handler
m_parse_handler_mgr->DeactivateHandler();
}
/ EOF
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