/// <summary>
/// Converts the Algebra back to a SPARQL Query
/// </summary>
/// <returns></returns>
public GraphPattern ToGraphPattern()
{
GraphPattern p = _lhs.ToGraphPattern();
p.AddGraphPattern(_rhs.ToGraphPattern());
return(p);
}
/// <summary>
/// Tries to substitute variables within primary expressions
/// </summary>
/// <param name="expr">Expression</param>
/// <returns></returns>
protected override ISparqlExpression SubstitutePrimaryExpression(ISparqlExpression expr)
{
if (expr is VariableTerm)
{
if (expr.Variables.First().Equals(this._findVar))
{
return(this._replaceExpr);
}
else
{
return(expr);
}
}
else if (expr is GraphPatternTerm)
{
GraphPatternTerm gp = (GraphPatternTerm)expr;
ISparqlAlgebra alg = gp.Pattern.ToAlgebra();
alg = this.Optimise(alg);
return(new GraphPatternTerm(alg.ToGraphPattern()));
}
else
{
return(expr);
}
}
/// <summary>
/// Converts the Algebra back to a SPARQL Query
/// </summary>
/// <returns></returns>
public GraphPattern ToGraphPattern()
{
GraphPattern p = _lhs.ToGraphPattern();
GraphPattern opt = _rhs.ToGraphPattern();
opt.IsOptional = true;
if (_filter.Expression is ConstantTerm)
{
try
{
if (!_filter.Expression.Evaluate(null, 0).AsSafeBoolean())
{
opt.Filter = _filter;
}
}
catch
{
opt.Filter = _filter;
}
}
else
{
opt.Filter = _filter;
}
p.AddGraphPattern(opt);
return(p);
}
private void RunTest(ISparqlPath path, IEnumerable <String> expectedOperators)
{
VariablePattern x = new VariablePattern("?x");
VariablePattern y = new VariablePattern("?y");
PathTransformContext context = new PathTransformContext(x, y);
Console.WriteLine("Path: " + path.ToString());
ISparqlAlgebra algebra = path.ToAlgebra(context);
String result = algebra.ToString();
Console.WriteLine("Algebra: " + result);
try
{
GraphPattern gp = algebra.ToGraphPattern();
Console.WriteLine("GraphPattern:");
Console.WriteLine(this._formatter.Format(gp));
Console.WriteLine();
}
catch
{
Console.WriteLine("Algebra not translatable to a GraphPattern");
}
foreach (String op in expectedOperators)
{
if (result.Contains(op))
{
continue;
}
Console.WriteLine("Expected Operator '" + op + "' missing");
Assert.True(false, "Expected Operator '" + op + "' missing");
}
}
/// <summary>
/// Converts the Algebra back to a Graph Pattern.
/// </summary>
/// <returns></returns>
public GraphPattern ToGraphPattern()
{
GraphPattern p = _pattern.ToGraphPattern();
GraphPattern f = new GraphPattern();
f.AddFilter(_filter);
p.AddGraphPattern(f);
return(p);
}
/// <summary>
/// Converts the Union back to Graph Patterns.
/// </summary>
/// <returns></returns>
public GraphPattern ToGraphPattern()
{
GraphPattern p = new GraphPattern();
p.IsUnion = true;
p.AddGraphPattern(_lhs.ToGraphPattern());
p.AddGraphPattern(_rhs.ToGraphPattern());
return(p);
}
/// <summary>
/// Converts the Algebra back to a Graph Pattern
/// </summary>
/// <returns></returns>
public GraphPattern ToGraphPattern()
{
GraphPattern p = _pattern.ToGraphPattern();
if (!p.IsGraph)
{
p.IsGraph = true;
p.GraphSpecifier = _graphSpecifier;
}
return(p);
}
/// <summary>
/// Converts the Algebra back to a Graph Pattern
/// </summary>
/// <returns></returns>
public GraphPattern ToGraphPattern()
{
GraphPattern p = _lhs.ToGraphPattern();
GraphPattern opt = _rhs.ToGraphPattern();
if (_mustExist)
{
opt.IsExists = true;
}
else
{
opt.IsNotExists = true;
}
p.AddGraphPattern(opt);
return(p);
}
/// <summary>
/// Converts the Algebra to a Graph Pattern.
/// </summary>
/// <returns></returns>
public GraphPattern ToGraphPattern()
{
GraphPattern gp = _inner.ToGraphPattern();
if (gp.HasModifier)
{
GraphPattern p = new GraphPattern();
p.AddGraphPattern(gp);
p.AddAssignment(new BindPattern(_var, _expr));
return(p);
}
else
{
gp.AddAssignment(new BindPattern(_var, _expr));
return(gp);
}
}
/// <summary>
/// Converts the Minus() back to a MINUS Graph Pattern.
/// </summary>
/// <returns></returns>
public GraphPattern ToGraphPattern()
{
GraphPattern p = _lhs.ToGraphPattern();
GraphPattern opt = _rhs.ToGraphPattern();
if (!opt.HasModifier)
{
opt.IsMinus = true;
p.AddGraphPattern(opt);
}
else
{
GraphPattern parent = new GraphPattern();
parent.AddGraphPattern(opt);
parent.IsMinus = true;
p.AddGraphPattern(parent);
}
return(p);
}