greenplumn CParseHandlerScalarAssertConstraintList 源码

greenplumn CParseHandlerScalarAssertConstraintList 代码

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

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2015 VMware, Inc. or its affiliates.
//
//	@filename:
//		CParseHandlerScalarAssertConstraintList.cpp
//
//	@doc:
//		Implementation of the SAX parse handler class for parsing scalar
//		assert operator constraint lists
//---------------------------------------------------------------------------

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

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

using namespace gpdxl;


XERCES_CPP_NAMESPACE_USE

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerScalarAssertConstraintList::CParseHandlerScalarAssertConstraintList
//
//	@doc:
//		Ctor
//
//---------------------------------------------------------------------------
CParseHandlerScalarAssertConstraintList::
	CParseHandlerScalarAssertConstraintList(
		CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
		CParseHandlerBase *parse_handler_root)
	: CParseHandlerScalarOp(mp, parse_handler_mgr, parse_handler_root),
	  m_dxl_op(nullptr),
	  m_dxl_op_assert_constraint(nullptr),
	  m_dxlnode_assert_constraints_parsed_array(nullptr)
{
}


//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerScalarAssertConstraintList::StartElement
//
//	@doc:
//		Invoked by Xerces to process an opening tag
//
//---------------------------------------------------------------------------
void
CParseHandlerScalarAssertConstraintList::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(EdxltokenScalarAssertConstraintList),
				 element_local_name))
	{
		GPOS_ASSERT(nullptr == m_dxl_op);
		GPOS_ASSERT(nullptr == m_dxl_op_assert_constraint);
		GPOS_ASSERT(nullptr == m_dxlnode_assert_constraints_parsed_array);

		m_dxl_op = GPOS_NEW(m_mp) CDXLScalarAssertConstraintList(m_mp);
		m_dxlnode_assert_constraints_parsed_array =
			GPOS_NEW(m_mp) CDXLNodeArray(m_mp);
	}
	else if (0 == XMLString::compareString(
					  CDXLTokens::XmlstrToken(EdxltokenScalarAssertConstraint),
					  element_local_name))
	{
		GPOS_ASSERT(nullptr != m_dxl_op);
		GPOS_ASSERT(nullptr == m_dxl_op_assert_constraint);

		// parse error message
		CWStringDynamic *pstrErrorMsg =
			CDXLOperatorFactory::ExtractConvertAttrValueToStr(
				m_parse_handler_mgr->GetDXLMemoryManager(), attrs,
				EdxltokenErrorMessage, EdxltokenScalarAssertConstraint);
		m_dxl_op_assert_constraint =
			GPOS_NEW(m_mp) CDXLScalarAssertConstraint(m_mp, pstrErrorMsg);

		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);
	}
	else
	{
		CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
			m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
		GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
				   str->GetBuffer());
	}
}

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerScalarAssertConstraintList::EndElement
//
//	@doc:
//		Invoked by Xerces to process a closing tag
//
//---------------------------------------------------------------------------
void
CParseHandlerScalarAssertConstraintList::EndElement(
	const XMLCh *const,	 // element_uri,
	const XMLCh *const element_local_name,
	const XMLCh *const	// element_qname
)
{
	if (0 == XMLString::compareString(
				 CDXLTokens::XmlstrToken(EdxltokenScalarAssertConstraintList),
				 element_local_name))
	{
		GPOS_ASSERT(nullptr != m_dxl_op);
		GPOS_ASSERT(nullptr != m_dxlnode_assert_constraints_parsed_array);

		// assemble final assert predicate node
		m_dxl_node = GPOS_NEW(m_mp)
			CDXLNode(m_dxl_op, m_dxlnode_assert_constraints_parsed_array);

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

		// deactivate handler
		m_parse_handler_mgr->DeactivateHandler();
	}
	else if (0 == XMLString::compareString(
					  CDXLTokens::XmlstrToken(EdxltokenScalarAssertConstraint),
					  element_local_name))
	{
		GPOS_ASSERT(nullptr != m_dxl_op_assert_constraint);

		CParseHandlerScalarOp *child_parse_handler =
			dynamic_cast<CParseHandlerScalarOp *>((*this)[this->Length() - 1]);
		CDXLNode *child_dxlnode = child_parse_handler->CreateDXLNode();
		GPOS_ASSERT(nullptr != child_dxlnode);
		child_dxlnode->AddRef();

		CDXLNode *pdxlnAssertConstraint = GPOS_NEW(m_mp)
			CDXLNode(m_mp, m_dxl_op_assert_constraint, child_dxlnode);
		m_dxlnode_assert_constraints_parsed_array->Append(
			pdxlnAssertConstraint);
		m_dxl_op_assert_constraint = nullptr;
	}
	else
	{
		CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
			m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
		GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
				   str->GetBuffer());
	}
}

// EOF

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