greenplumn CParseHandlerLogicalOp 源码
greenplumn CParseHandlerLogicalOp 代码
文件路径：/src/backend/gporca/libnaucrates/src/parser/CParseHandlerLogicalOp.cpp
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 Greenplum, Inc.
//
// @filename:
// CParseHandlerLogicalOp.cpp
//
// @doc:
// Implementation of the SAX parse handler class for parsing logical operators.
//---------------------------------------------------------------------------
#include "naucrates/dxl/parser/CParseHandlerLogicalOp.h"
#include "naucrates/dxl/parser/CParseHandlerFactory.h"
using namespace gpdxl;
XERCES_CPP_NAMESPACE_USE
//---------------------------------------------------------------------------
// @function:
// CParseHandlerLogicalOp::CParseHandlerLogicalOp
//
// @doc:
// Constructor
//
//---------------------------------------------------------------------------
CParseHandlerLogicalOp::CParseHandlerLogicalOp(
CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root)
: CParseHandlerOp(mp, parse_handler_mgr, parse_handler_root)
{
}
//---------------------------------------------------------------------------
// @function:
// CParseHandlerLogicalOp::StartElement
//
// @doc:
// Invoked by Xerces to process an opening tag of a logical operator node.
// This function serves as a dispatcher for invoking the correct processing
// function for the respective operator type.
//
//---------------------------------------------------------------------------
void
CParseHandlerLogicalOp::StartElement(const XMLCh *const element_uri,
const XMLCh *const element_local_name,
const XMLCh *const element_qname,
const Attributes &attrs)
{
// instantiate the parse handler
CParseHandlerBase *logical_op_parse_handler =
CParseHandlerFactory::GetParseHandler(m_mp, element_local_name,
m_parse_handler_mgr, this);
GPOS_ASSERT(nullptr != logical_op_parse_handler);
// activate the parse handler
m_parse_handler_mgr->ReplaceHandler(logical_op_parse_handler,
m_parse_handler_root);
// pass the startElement message for the specialized parse handler to process
logical_op_parse_handler->startElement(element_uri, element_local_name,
element_qname, attrs);
}
//---------------------------------------------------------------------------
// @function:
// CParseHandlerLogicalOp::EndElement
//
// @doc:
// Invoked by Xerces to process a closing tag.
// This function should never be called. Instead, the endElement function
// of the parse handler for the actual physical operator type is called.
//
//---------------------------------------------------------------------------
void
CParseHandlerLogicalOp::EndElement(const XMLCh *const, // element_uri,
const XMLCh *const, // element_local_name,
const XMLCh *const // element_qname
)
{
GPOS_ASSERT(!"Invalid call of endElement inside CParseHandlerLogicalOp");
}
// EOF
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