private void ProcessSelectable(bool isSubQuery, ISelectableQueryComponent expression, Func <string, string> createVariableName, StrongEntityAccessor mainEntityAccessor)
{
System.Reflection.MethodInfo processSelectable = typeof(GenericSparqlQueryVisitor).GetTypeInfo().GetMethod("ProcessSelectable" + expression.GetType().Name, System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);
if (processSelectable != null)
{
processSelectable.Invoke(this, new object[] { expression, isSubQuery, createVariableName, mainEntityAccessor });
}
foreach (IExpression selectableExpression in expression.Expressions)
{
VisitComponent(selectableExpression);
_commandText.Append(" ");
}
}
private void ProcessSelectable(bool isSubQuery, ISelectableQueryComponent expression, Func<string, string> createVariableName)
{
if (!isSubQuery)
{
if (expression is UnspecifiedEntityAccessor)
{
if ((_metaGraphVariableName == null) && (_entityVariableName == null))
{
_metaGraphVariableName = "graph";
_entityVariableName = ((StrongEntityAccessor)expression).About.Name;
}
_commandText.AppendFormat(
"IF(BOUND(?G{0}),?G{0},?G{1}) AS ?{2} ",
((UnspecifiedEntityAccessor)expression).About.Name,
((UnspecifiedEntityAccessor)expression).EntityAccessor.About.Name,
_metaGraphVariableName);
}
else if (expression is IdentifierEntityAccessor)
{
if ((_metaGraphVariableName == null) && (_entityVariableName == null))
{
_metaGraphVariableName = String.Format("G{0}", ((StrongEntityAccessor)expression).About.Name);
_entityVariableName = ((StrongEntityAccessor)expression).About.Name + "_Distinct";
}
_subjectVariableName = ((StrongEntityAccessor)expression).About.Name;
_predicateVariableName = ((StrongEntityAccessor)expression).About.Name + "_Predicate";
_objectVariableName = ((StrongEntityAccessor)expression).About.Name + "_Object";
_commandText.AppendFormat(
"DISTINCT(?{2}) AS ?{1} ?{0} ?{3} ?{4} ",
_metaGraphVariableName,
_entityVariableName,
((StrongEntityAccessor)expression).About.Name,
_predicateVariableName,
_objectVariableName);
}
else if (expression is StrongEntityAccessor)
{
if ((_metaGraphVariableName == null) && (_entityVariableName == null))
{
_metaGraphVariableName = String.Format("G{0}", _entityVariableName = ((StrongEntityAccessor)expression).About.Name);
}
_commandText.AppendFormat("?{0} ", _metaGraphVariableName);
}
else if (expression is UnboundConstrain)
{
UnboundConstrain unboundConstrain = (UnboundConstrain)expression;
if ((unboundConstrain.Subject is Identifier) && (unboundConstrain.Predicate is Identifier) && (unboundConstrain.Value is Identifier))
{
_subjectVariableName = ((Identifier)unboundConstrain.Subject).Name;
_predicateVariableName = ((Identifier)unboundConstrain.Predicate).Name;
_objectVariableName = ((Identifier)unboundConstrain.Value).Name;
}
}
else if (expression is Call)
{
if (_scalarVariableName == null)
{
_scalarVariableName = createVariableName(((Call)expression).Member.ToString());
}
}
else if (expression is Alias)
{
Alias alias = (Alias)expression;
if ((_scalarVariableName == null) && (alias.Name != null))
{
_scalarVariableName = alias.Name.Name;
}
}
}
foreach (IExpression selectableExpression in expression.Expressions)
{
VisitComponent(selectableExpression);
_commandText.Append(" ");
}
}
