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from rdflib.sparql.bison.GraphPattern import GraphPattern
class Query(object):
"""
Query ::= Prolog ( SelectQuery | ConstructQuery | DescribeQuery | AskQuery )
See: http://www.w3.org/TR/rdf-sparql-query/#rQuery
"""
def __init__(self,prolog,query):
self.prolog = prolog
self.query = query
def __repr__(self):
return repr(self.query)
class WhereClause(object):
"""
The where clause is essentially a wrapper for an instance of a ParsedGraphPattern
"""
def __init__(self,parsedGraphPattern):
self.parsedGraphPattern = parsedGraphPattern
class SelectQuery(object):
"""
SelectQuery ::= 'SELECT' 'DISTINCT'? ( Var+ | '*' ) DatasetClause* WhereClause SolutionModifier
See: http://www.w3.org/TR/rdf-sparql-query/#rSelectQuery
"""
def __init__(self,variables,dataSetList,whereClause,solutionModifier,distinct=None):
self.variables = variables is not None and variables or []
self.dataSets = dataSetList and dataSetList or []
self.whereClause = whereClause
self.solutionModifier = solutionModifier
self.distinct = distinct is not None
def __repr__(self):
return "SELECT %s %s %s %s %s"%(self.distinct and 'DISTINCT' or '',self.variables and self.variables or '*',self.dataSets,self.whereClause.parsedGraphPattern,self.solutionModifier and self.solutionModifier or '')
class AskQuery(object):
"""
AskQuery ::= 'ASK' DatasetClause* WhereClause
See: http://www.w3.org/TR/rdf-sparql-query/#rAskQuery
"""
def __init__(self,dataSetList,whereClause):
self.dataSets = dataSetList and dataSetList or []
self.whereClause = whereClause
def __repr__(self):
return "ASK %s %s"%(self.dataSets,self.whereClause.parsedGraphPattern)
class ConstructQuery(object):
"""
ConstructQuery ::= 'CONSTRUCT' ConstructTemplate DatasetClause* WhereClause SolutionModifier
See: http://www.w3.org/TR/rdf-sparql-query/#rConstructQuery
"""
def __init__(self,triples,dataSetList,whereClause,solutionModifier):
self.triples = GraphPattern(triples=triples)
self.dataSets = dataSetList and dataSetList or []
self.whereClause = whereClause
self.solutionModifier = solutionModifier
class DescribeQuery(object):
"""
DescribeQuery ::= 'DESCRIBE' ( VarOrIRIref+ | '*' ) DatasetClause* WhereClause? SolutionModifier
http://www.w3.org/TR/rdf-sparql-query/#rConstructQuery
"""
def __init__(self,variables,dataSetList,whereClause,solutionModifier):
self.describeVars = variables is not None and variables or []
self.dataSets = dataSetList and dataSetList or []
self.whereClause = whereClause
self.solutionModifier = solutionModifier
def __repr__(self):
return "DESCRIBE %s %s %s %s"%(
self.describeVars,
self.dataSets,
self.whereClause.parsedGraphPattern,
self.solutionModifier)
class Prolog(object):
"""
Prolog ::= BaseDecl? PrefixDecl*
See: http://www.w3.org/TR/rdf-sparql-query/#rProlog
"""
def __init__(self,baseDeclaration,prefixDeclarations):
self.baseDeclaration = baseDeclaration
self.extensionFunctions={}
self.prefixBindings = {}
if prefixDeclarations:
for prefixBind in prefixDeclarations:
if hasattr(prefixBind,'base'):
self.prefixBindings[prefixBind.qName] = prefixBind.base
def __repr__(self):
return repr(self.prefixBindings)
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