/// <summary>
/// Recursively create a query model for a particular type
/// </summary>
private LabelledTreeNode <object, Term> ConvertTypeToGraph(Type objectType)
{
var graph = new LabelledTreeNode <object, Term>(new Variable());
var resourceAttribute = objectType.GetTypeInfo().GetCustomAttribute <EntityBindAttribute>();
if (resourceAttribute != null)
{
graph.AddChild(new Rdf("type"), resourceAttribute.Type);
}
foreach (var member in objectType.GetRuntimeProperties())
{
var memberAttribute = member.GetCustomAttribute <PropertyBindAttribute>();
if (memberAttribute != null)
{
Type relevantType;
if (member.PropertyType.IsListType())
{
relevantType = member.PropertyType.GenericTypeArguments[0];
}
else
{
relevantType = member.PropertyType;
}
var memberGraph = ConvertTypeToGraph(relevantType);
graph.AddChild(memberAttribute.Property, memberGraph);
}
}
return(graph);
}
private void AddChildToGraph(LabelledTreeNode <object, Term> graph, object obj, Type objType, Resource property)
{
if (typeof(Resource).GetTypeInfo().IsAssignableFrom(objType))
{
var memberGraph = CreateObjectGraph((Resource)obj);
graph.AddChild(property, memberGraph);
}
else
{
var value = obj;
graph.AddChild(property, value);
}
}
/// <summary>
/// Create a graph of typed objects using the type graph as a model
/// </summary>
private LabelledTreeNode <object, Term> TypifyGraph(LabelledTreeNode <object, Term> objectGraph, LabelledTreeNode <Type, Term> typeGraph)
{
var obj = ConvertGraphToTypedObject(objectGraph, typeGraph.Value);
var typedGraph = new LabelledTreeNode <object, Term>(obj);
foreach (var outEdge in typeGraph.Children)
{
var edge = outEdge.Edge;
var childTypeGraph = outEdge.TerminalNode;
var childObjectGraphs = objectGraph.Descend(edge);
foreach (var childObjectGraph in childObjectGraphs)
{
typedGraph.AddChild(edge, TypifyGraph(childObjectGraph, childTypeGraph));
}
}
return(typedGraph);
}
public void InsertionAndDeletion()
{
IGraphContext context = new GraphContext();
var query = context.Select <RdfPropertyWithRange>();
int i = 0;
foreach (var item in query)
{
i++;
}
Assert.Equal(181, i);
var prop = new RdfPropertyWithRange("http://example.org/exampleprop");
prop.Range = new RdfClass("http://example.org/exampleclass");
context.Add(prop);
i = 0;
foreach (var item in query)
{
i++;
}
Assert.Equal(183, i);
var graph = new LabelledTreeNode <object, Term>(prop);
graph.AddChild(new Rdfs("range"), new RdfClass("http://example.org/exampleclass"));
context.Remove(graph);
i = 0;
foreach (var item in query)
{
i++;
}
Assert.Equal(181, i);
}
private LabelledTreeNode <object, Term> CreateObjectGraph(Resource resource)
{
var graph = new LabelledTreeNode <object, Term>(new Resource(resource.Id));
var objectType = resource.GetType();
var resourceAttribute = objectType.GetTypeInfo().GetCustomAttribute <EntityBindAttribute>();
if (resourceAttribute != null)
{
graph.AddChild(new Rdf("type"), resourceAttribute.Type);
}
foreach (var member in objectType.GetRuntimeProperties())
{
var memberAttribute = member.GetCustomAttribute <PropertyBindAttribute>();
if (memberAttribute != null)
{
Type relevantType;
if (member.PropertyType.IsListType())
{
relevantType = member.PropertyType.GenericTypeArguments[0];
var countMember = member.PropertyType.GetRuntimeProperty("Count");
var removeMethod = member.PropertyType.GetRuntimeMethod("Remove", new Type[] { });
while ((int)countMember.GetValue(member.GetValue(resource)) > 0)
{
var obj = removeMethod.Invoke(member.GetValue(resource), new object[] { });
AddChildToGraph(graph, obj, relevantType, memberAttribute.Property);
}
}
else
{
relevantType = member.PropertyType;
var obj = member.GetValue(resource);
AddChildToGraph(graph, obj, relevantType, memberAttribute.Property);
}
}
}
return(graph);
}
public IEnumerable <LabelledTreeNode <object, Term> > Evaluate(LabelledTreeNode <object, Term> queryModel, int?offset, int?limit, IFilter filter, IGraphSource source)
{
if (source.EndPoint.Equals(TestUris.MathematiciansRepoUri)) //8 mathematicians
{
var archimedes = new LabelledTreeNode <object, Term>("archimedes");
var gauss = new LabelledTreeNode <object, Term>("gauss");
var descartes = new LabelledTreeNode <object, Term>("descartes");
var euclid = new LabelledTreeNode <object, Term>("euclid");
var newton = new LabelledTreeNode <object, Term>("newton");
var pythagoras = new LabelledTreeNode <object, Term>("pythagoras");
var euler = new LabelledTreeNode <object, Term>("euler");
var leibniz = new LabelledTreeNode <object, Term>("leibniz");
archimedes.AddChild(Biografy.Name, "Archimedes")
.AddChild(Biografy.YearOfBirth, -287)
.AddChild(Biografy.YearOfDeath, -212)
.AddChild(Biografy.Nationality, "greece");
gauss.AddChild(Biografy.Name, "Carl Friedrich Gauss")
.AddChild(Biografy.YearOfBirth, 1777)
.AddChild(Biografy.YearOfDeath, 1855)
.AddChild(Biografy.Nationality, "germany");
descartes.AddChild(Biografy.Name, "René Descartes")
.AddChild(Biografy.YearOfBirth, 1596)
.AddChild(Biografy.YearOfDeath, 1650)
.AddChild(Biografy.Nationality, "france");
euclid.AddChild(Biografy.Name, "Euclid")
.AddChild(Biografy.YearOfBirth, -325)
.AddChild(Biografy.YearOfDeath, -265)
.AddChild(Biografy.Nationality, "greece");
newton.AddChild(Biografy.Name, "Isaac Newton")
.AddChild(Biografy.YearOfBirth, 1643)
.AddChild(Biografy.YearOfDeath, 1727)
.AddChild(Biografy.Nationality, "england");
pythagoras.AddChild(Biografy.Name, "Pythagoras")
.AddChild(Biografy.YearOfBirth, -569)
.AddChild(Biografy.YearOfDeath, -475)
.AddChild(Biografy.Nationality, "greece");
euler.AddChild(Biografy.Name, "Leonhard Euler")
.AddChild(Biografy.YearOfBirth, 1707)
.AddChild(Biografy.YearOfDeath, 1783)
.AddChild(Biografy.Nationality, "switzerland");
leibniz.AddChild(Biografy.Name, "Gottfried Wilhelm Leibniz")
.AddChild(Biografy.YearOfBirth, 1646)
.AddChild(Biografy.YearOfDeath, 1716)
.AddChild(Biografy.Nationality, "germany");
yield return(archimedes);
yield return(gauss);
yield return(descartes);
yield return(euclid);
yield return(newton);
yield return(pythagoras);
yield return(euler);
yield return(leibniz);
}
else if (source.EndPoint.Equals(TestUris.PhysicistRepoUri)) //7 physiscists
{
var einstein = new LabelledTreeNode <object, Term>("einstein");
var curie = new LabelledTreeNode <object, Term>("curie");
var bohr = new LabelledTreeNode <object, Term>("bohr");
var feynman = new LabelledTreeNode <object, Term>("feynman");
var newton = new LabelledTreeNode <object, Term>("newton");
var galilei = new LabelledTreeNode <object, Term>("galilei");
var maxwell = new LabelledTreeNode <object, Term>("maxwell");
einstein.AddChild(Biografy.Name, "Albert Einstein")
.AddChild(Biografy.YearOfBirth, 1879)
.AddChild(Biografy.YearOfDeath, 1955)
.AddChild(Biografy.Nationality, "germany");
curie.AddChild(Biografy.Name, "Marie Curie")
.AddChild(Biografy.YearOfBirth, 1867)
.AddChild(Biografy.YearOfDeath, 1934)
.AddChild(Biografy.Nationality, "france");
bohr.AddChild(Biografy.Name, "Niels Bohr")
.AddChild(Biografy.YearOfBirth, 1885)
.AddChild(Biografy.YearOfDeath, 1962)
.AddChild(Biografy.Nationality, "denmark");
feynman.AddChild(Biografy.Name, "Richard Feynman")
.AddChild(Biografy.YearOfBirth, 1918)
.AddChild(Biografy.YearOfDeath, 1988)
.AddChild(Biografy.Nationality, "usa");
newton.AddChild(Biografy.Name, "Isaac Newton")
.AddChild(Biografy.YearOfBirth, 1643)
.AddChild(Biografy.YearOfDeath, 1727)
.AddChild(Biografy.Nationality, "england");
galilei.AddChild(Biografy.Name, "Galileo Galilei")
.AddChild(Biografy.YearOfBirth, 1564)
.AddChild(Biografy.YearOfDeath, 1642)
.AddChild(Biografy.Nationality, "italy");
maxwell.AddChild(Biografy.Name, "James Clerk Maxwell")
.AddChild(Biografy.YearOfBirth, 1831)
.AddChild(Biografy.YearOfDeath, 1879)
.AddChild(Biografy.Nationality, "scottland");
yield return(einstein);
yield return(curie);
yield return(bohr);
yield return(feynman);
yield return(newton);
yield return(galilei);
yield return(maxwell);
}
else if (source.EndPoint.Equals(TestUris.NationsRepouri)) //7 nations
{
var germany = new LabelledTreeNode <object, Term>("germany");
var france = new LabelledTreeNode <object, Term>("france");
var denmark = new LabelledTreeNode <object, Term>("denmark");
var greece = new LabelledTreeNode <object, Term>("greece");
var italy = new LabelledTreeNode <object, Term>("italy");
var england = new LabelledTreeNode <object, Term>("england");
var scottland = new LabelledTreeNode <object, Term>("scottland");
var usa = new LabelledTreeNode <object, Term>("usa");
var switzerland = new LabelledTreeNode <object, Term>("switzerland");
germany.AddChild(Geografy.Name, "Germany")
.AddChild(Geografy.Capital, "Berlin")
.AddChild(Geografy.Continent, "Europe")
.AddChild(Geografy.Population, 80620000);
france.AddChild(Geografy.Name, "France")
.AddChild(Geografy.Capital, "Paris")
.AddChild(Geografy.Continent, "Europe")
.AddChild(Geografy.Population, 66030000);
denmark.AddChild(Geografy.Name, "Denmark")
.AddChild(Geografy.Capital, "Berlin")
.AddChild(Geografy.Continent, "Europe");
greece.AddChild(Geografy.Name, "Greece")
.AddChild(Geografy.Capital, "Athens")
.AddChild(Geografy.Continent, "Europe")
.AddChild(Geografy.Population, 11030000);
italy.AddChild(Geografy.Name, "Italy")
.AddChild(Geografy.Capital, "Rome")
.AddChild(Geografy.Continent, "Europe");
england.AddChild(Geografy.Name, "England")
.AddChild(Geografy.Capital, "Berlin")
.AddChild(Geografy.Continent, "Europe")
.AddChild(Geografy.Population, 53010000);
scottland.AddChild(Geografy.Name, "Scottland")
.AddChild(Geografy.Capital, "Berlin")
.AddChild(Geografy.Continent, "Europe")
.AddChild(Geografy.Population, 5295000);
usa.AddChild(Geografy.Name, "United States Of America")
.AddChild(Geografy.Capital, "Washington")
.AddChild(Geografy.Continent, "America")
.AddChild(Geografy.Population, 318900000);
switzerland.AddChild(Geografy.Name, "Switzerland")
.AddChild(Geografy.Capital, "Bern")
.AddChild(Geografy.Continent, "Europe")
.AddChild(Geografy.Population, 8081000);
yield return(germany);
yield return(france);
yield return(denmark);
yield return(greece);
yield return(england);
yield return(scottland);
yield return(usa);
yield return(switzerland);
}
else
{
yield return(new LabelledTreeNode <object, Term>(null));
}
}