greenplumn CParseHandlerOp 源码
greenplumn CParseHandlerOp 代码
文件路径：/src/backend/gporca/libnaucrates/src/parser/CParseHandlerOp.cpp
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2010 Greenplum, Inc.
//
// @filename:
// CParseHandlerOp.cpp
//
// @doc:
// Implementation of the base SAX parse handler class for parsing DXL operators.
//---------------------------------------------------------------------------
#include "naucrates/dxl/parser/CParseHandlerOp.h"
#include "naucrates/dxl/parser/CParseHandlerFactory.h"
using namespace gpdxl;
XERCES_CPP_NAMESPACE_USE
//---------------------------------------------------------------------------
// @function:
// CParseHandlerOp::CParseHandlerOp
//
// @doc:
// Constructor
//
//---------------------------------------------------------------------------
CParseHandlerOp::CParseHandlerOp(CMemoryPool *mp,
CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root)
: CParseHandlerBase(mp, parse_handler_mgr, parse_handler_root),
m_dxl_node(nullptr)
{
}
//---------------------------------------------------------------------------
// @function:
// CParseHandlerOp::~CParseHandlerOp
//
// @doc:
// Destructor
//
//---------------------------------------------------------------------------
CParseHandlerOp::~CParseHandlerOp()
{
CRefCount::SafeRelease(m_dxl_node);
}
//---------------------------------------------------------------------------
// @function:
// CParseHandlerOp::CreateDXLNode
//
// @doc:
// Returns the constructed DXL node and passes ownership over it.
//
//---------------------------------------------------------------------------
CDXLNode *
CParseHandlerOp::CreateDXLNode() const
{
return m_dxl_node;
}
//---------------------------------------------------------------------------
// @function:
// CParseHandlerOp::AddChildFromParseHandler
//
// @doc:
// Extracts the node constructed from the given parse handler and adds it
// to children array of the current node. Child nodes are ref-counted before
// being added to the array.
//
//---------------------------------------------------------------------------
void
CParseHandlerOp::AddChildFromParseHandler(
const CParseHandlerOp *parse_handler_op)
{
GPOS_ASSERT(nullptr != m_dxl_node);
GPOS_ASSERT(nullptr != parse_handler_op);
// extract constructed element
CDXLNode *child_dxlnode = parse_handler_op->CreateDXLNode();
GPOS_ASSERT(nullptr != child_dxlnode);
child_dxlnode->AddRef();
m_dxl_node->AddChild(child_dxlnode);
}
// EOF
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