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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