greenplumn CParseHandlerArray 源码

greenplumn CParseHandlerArray 代码

文件路径：/src/backend/gporca/libnaucrates/src/parser/CParseHandlerArray.cpp

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2012 EMC Corp.
//
//	@filename:
//		CParseHandlerArray.cpp
//
//	@doc:
//		Implementation of the SAX parse handler class for parsing arrays
//---------------------------------------------------------------------------

#include "naucrates/dxl/parser/CParseHandlerArray.h"

#include "naucrates/dxl/operators/CDXLOperatorFactory.h"
#include "naucrates/dxl/operators/CDXLScalarArray.h"
#include "naucrates/dxl/parser/CParseHandlerFactory.h"

using namespace gpdxl;


XERCES_CPP_NAMESPACE_USE

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerArray::CParseHandlerArray
//
//	@doc:
//		Ctor
//
//---------------------------------------------------------------------------
CParseHandlerArray::CParseHandlerArray(CMemoryPool *mp,
									   CParseHandlerManager *parse_handler_mgr,
									   CParseHandlerBase *parse_handler_root)
	: CParseHandlerScalarOp(mp, parse_handler_mgr, parse_handler_root)
{
}


//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerArray::StartElement
//
//	@doc:
//		Invoked by Xerces to process an opening tag
//
//---------------------------------------------------------------------------
void
CParseHandlerArray::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(EdxltokenScalarArray),
				 element_local_name) &&
		nullptr == m_dxl_node)
	{
		// parse and create array
		CDXLScalarArray *dxl_op =
			(CDXLScalarArray *) CDXLOperatorFactory::MakeDXLArray(
				m_parse_handler_mgr->GetDXLMemoryManager(), attrs);
		m_dxl_node = GPOS_NEW(m_mp) CDXLNode(m_mp, dxl_op);
	}
	else
	{
		// parse child of array
		GPOS_ASSERT(nullptr != m_dxl_node);

		CParseHandlerBase *child_parse_handler =
			CParseHandlerFactory::GetParseHandler(
				m_mp, CDXLTokens::XmlstrToken(EdxltokenScalar),
				m_parse_handler_mgr, this);
		m_parse_handler_mgr->ActivateParseHandler(child_parse_handler);
		this->Append(child_parse_handler);
		child_parse_handler->startElement(element_uri, element_local_name,
										  element_qname, attrs);
	}
}

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerArray::EndElement
//
//	@doc:
//		Invoked by Xerces to process a closing tag
//
//---------------------------------------------------------------------------
void
CParseHandlerArray::EndElement(const XMLCh *const,	// element_uri,
							   const XMLCh *const element_local_name,
							   const XMLCh *const  // element_qname
)
{
	if (0 !=
		XMLString::compareString(CDXLTokens::XmlstrToken(EdxltokenScalarArray),
								 element_local_name))
	{
		CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
			m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
		GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
				   str->GetBuffer());
	}

	// construct node from the created child nodes

	for (ULONG ul = 0; ul < this->Length(); ul++)
	{
		CParseHandlerScalarOp *child_parse_handler =
			dynamic_cast<CParseHandlerScalarOp *>((*this)[ul]);
		GPOS_ASSERT(nullptr != child_parse_handler);
		AddChildFromParseHandler(child_parse_handler);
	}

#ifdef GPOS_DEBUG
	m_dxl_node->GetOperator()->AssertValid(m_dxl_node,
										   false /* validate_children */);
#endif	// GPOS_DEBUG

	// deactivate handler
	m_parse_handler_mgr->DeactivateHandler();
}

// EOF

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