greenplumn CParseHandlerScalarNullTest 代码
文件路径：/src/backend/gporca/libnaucrates/src/parser/CParseHandlerScalarNullTest.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2011 Greenplum, Inc.
/
/ @filename:
/ CParseHandlerScalarNullTest.cpp
/
/ @doc:
/
/ Implementation of the SAX parse handler class for parsing scalar NullTest.
/---------------------------------------------------------------------------
#include "naucrates/dxl/parser/CParseHandlerScalarNullTest.h"
#include "naucrates/dxl/CDXLUtils.h"
#include "naucrates/dxl/operators/CDXLOperatorFactory.h"
#include "naucrates/dxl/parser/CParseHandlerFactory.h"
#include "naucrates/dxl/parser/CParseHandlerScalarOp.h"
using namespace gpdxl;
XERCES_CPP_NAMESPACE_USE
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerScalarNullTest::CParseHandlerScalarNullTest
/
/ @doc:
/ Constructor
/
/---------------------------------------------------------------------------
CParseHandlerScalarNullTest::CParseHandlerScalarNullTest(
CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root)
: CParseHandlerScalarOp(mp, parse_handler_mgr, parse_handler_root)
{
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerScalarNullTest::StartElement
/
/ @doc:
/ Processes a Xerces start element event
/
/---------------------------------------------------------------------------
void
CParseHandlerScalarNullTest::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(EdxltokenScalarIsNull),
element_local_name)) ||
(0 == XMLString::compareString(
CDXLTokens::XmlstrToken(EdxltokenScalarIsNotNull),
element_local_name)))
{
if (nullptr != m_dxl_node)
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
BOOL is_null = true;
if (0 == XMLString::compareString(
CDXLTokens::XmlstrToken(EdxltokenScalarIsNotNull),
element_local_name))
{
is_null = false;
}
/ parse and create scalar NullTest
CDXLScalarNullTest *dxl_op =
(CDXLScalarNullTest *) CDXLOperatorFactory::MakeDXLNullTest(
m_parse_handler_mgr->GetDXLMemoryManager(), is_null);
/ construct node from the created child node
m_dxl_node = GPOS_NEW(m_mp) CDXLNode(m_mp, dxl_op);
/ parse handler for child scalar 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);
/ store 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:
/ CParseHandlerScalarNullTest::EndElement
/
/ @doc:
/ Processes a Xerces end element event
/
/---------------------------------------------------------------------------
void
CParseHandlerScalarNullTest::EndElement(const XMLCh *const, / element_uri,
const XMLCh *const element_local_name,
const XMLCh *const / element_qname
)
{
if ((0 != XMLString::compareString(
CDXLTokens::XmlstrToken(EdxltokenScalarIsNull),
element_local_name)) &&
(0 != XMLString::compareString(
CDXLTokens::XmlstrToken(EdxltokenScalarIsNotNull),
element_local_name)))
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
GPOS_ASSERT(1 == this->Length());
/ add constructed child from child parse handler
CParseHandlerScalarOp *child_parse_handler =
dynamic_cast<CParseHandlerScalarOp *>((*this)[0]);
AddChildFromParseHandler(child_parse_handler);
/ deactivate handler
m_parse_handler_mgr->DeactivateHandler();
}
/ EOF
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