static void Test(Graph document, Triple clause)
{
Console.WriteLine(clause.Display());
foreach (var entry in document.Match(clause))
{
Console.WriteLine(entry);
}
}
static Triple MakeClause(Triple queryTriple)
{
return new Triple
{
Subject = queryTriple.Subject is Variable ? null : queryTriple.Subject,
Predicate = queryTriple.Predicate is Variable ? null : queryTriple.Predicate,
Object = queryTriple.Object is Variable ? null : queryTriple.Object
};
}
static IDictionary<string, object> UpdateBinding(Triple queryTriple, Triple row, IDictionary<string, object> existingBinding)
{
var result = new Dictionary<string, object>(existingBinding);
if (queryTriple.Subject is Variable)
{
var variableName = ((Variable)queryTriple.Subject).Value;
var newValue = row.Subject;
if (result.ContainsKey(variableName))
{
if (!result[variableName].Equals(newValue))
{
return null;
}
}
else
{
result[variableName] = newValue;
}
}
if (queryTriple.Predicate is Variable)
{
var variableName = ((Variable)queryTriple.Predicate).Value;
var newValue = row.Predicate;
if (result.ContainsKey(variableName))
{
if (!result[variableName].Equals(newValue))
{
return null;
}
}
else
{
result[variableName] = newValue;
}
}
if (queryTriple.Object is Variable)
{
var variableName = ((Variable)queryTriple.Object).Value;
var newValue = row.Object;
if (result.ContainsKey(variableName))
{
if (!result[variableName].Equals(newValue))
{
return null;
}
}
else
{
result[variableName] = newValue;
}
}
return result;
}
static IDictionary<string, object> MakeBinding(Triple queryTriple, Triple row, IDictionary<string, object> parameters)
{
var result = new Dictionary<string, object>(parameters ?? new Dictionary<string, object>());
if (queryTriple.Subject is Variable)
{
result[((Variable)queryTriple.Subject).Value] = row.Subject;
}
if (queryTriple.Predicate is Variable)
{
result[((Variable)queryTriple.Predicate).Value] = row.Predicate;
}
if (queryTriple.Object is Variable)
{
result[((Variable)queryTriple.Object).Value] = row.Object;
}
return result;
}
static Triple()
{
Empty = new Triple();
}