internal static ServiceBaseExpression ToServiceExpression(IExpression myExpression)
{
ServiceBaseExpression expression = null;
if (myExpression is BinaryExpression)
{
expression = new ServiceBinaryExpression((BinaryExpression)myExpression);
}
else if (myExpression is PropertyExpression)
{
expression = new ServicePropertyExpression((PropertyExpression)myExpression);
}
else if (myExpression is SingleLiteralExpression)
{
expression = new ServiceSingleLiteralExpression((SingleLiteralExpression)myExpression);
}
else if (myExpression is CollectionLiteralExpression)
{
expression = new ServiceCollectionLiteralExpression((CollectionLiteralExpression)myExpression);
}
else if (myExpression is RangeLiteralExpression)
{
expression = new ServiceRangeLiteralExpression((RangeLiteralExpression)myExpression);
}
else if (myExpression is UnaryExpression)
{
expression = new ServiceUnaryExpression((UnaryExpression)myExpression);
}
return(expression);
}
private void GatherData()
{
#region Get VertexType from DB by Name
//how to get a type from the DB
var TagDBType = _GraphDS_Service.GetVertexTypeByName(SecToken, TransToken, "Tag");
var WebsiteDBType = _GraphDS_Service.GetVertexTypeByName(SecToken, TransToken, "Website");
#endregion
#region Get VertexType definition information with VertexTypeService
//read informations from type
Console.WriteLine("Got vertex type name " + TagDBType.Name + " with ID " + TagDBType.ID);
Console.WriteLine("Got vertex type name " + WebsiteDBType.Name + " with ID " + WebsiteDBType.ID);
//are there other types wich extend the type "Tag" or "Website"
var hasChildTypes = _VertexTypeService.HasChildTypeByVertexType(SecToken,TransToken,TagDBType);
Console.WriteLine(TagDBType.Name + " HasChildTypes: " + hasChildTypes.ToString());
hasChildTypes = _VertexTypeService.HasChildTypeByVertexType(SecToken, TransToken, WebsiteDBType);
Console.WriteLine(WebsiteDBType.Name + " HasChildTypes: " + hasChildTypes.ToString());
#region collect all Properties on VertexType "Tag" and "Website"
var TagPropertyList = _VertexTypeService.GetPropertyDefinitionsByVertexType(SecToken, TransToken,TagDBType.Name, false);
var WebsitePropertyList = _VertexTypeService.GetPropertyDefinitionsByVertexType(SecToken, TransToken, WebsiteDBType.Name, false);
Console.WriteLine(Environment.NewLine);
Console.WriteLine("Properties of VertexType 'Tag'");
foreach (var Property in TagPropertyList)
{
Console.WriteLine(Property.Name + " : " + Property.BaseType.Substring(0, Property.BaseType.IndexOf(',')) + "| IsMandatory: "
+ Property.IsMandatory.ToString() + "| ID: " + Property.ID.ToString());
}
Console.WriteLine(Environment.NewLine);
Console.WriteLine("Properties of VertexType 'Website'");
foreach (var Property in WebsitePropertyList)
{
Console.WriteLine(Property.Name + " : " + Property.BaseType.Substring(0, Property.BaseType.IndexOf(',')) + "| IsMandatory: "
+ Property.IsMandatory.ToString() + "| ID: " + Property.ID.ToString());
}
Console.WriteLine(Environment.NewLine);
#endregion
//are there any IncomingEdges
var TagIncoming = _VertexTypeService.HasIncomingEdges(SecToken, TransToken, TagDBType, false);
var WebsiteIncoming = _VertexTypeService.HasIncomingEdges(SecToken, TransToken, WebsiteDBType, false);
Console.WriteLine(TagDBType.Name + " HasIncomingEdges: " + TagIncoming);
Console.WriteLine(WebsiteDBType.Name + " HasIncomingEdges: " + WebsiteIncoming);
Console.WriteLine(Environment.NewLine);
//todo add some VertexTypeService functions
#endregion
#region Get Vertex Instance information with VertexInstanceService
//get a specific property definition
var TagPropName = _VertexTypeService.GetPropertyDefinitionByVertexType(SecToken, TransToken, TagDBType.Name, "Name");
var WebPropName = _VertexTypeService.GetPropertyDefinitionByVertexType(SecToken, TransToken, WebsiteDBType.Name, "Name");
var WebPropURL = _VertexTypeService.GetPropertyDefinitionByVertexType(SecToken, TransToken, WebsiteDBType.Name, "URL");
var TagWebsite = _VertexTypeService.GetOutgoingEdgeDefinitionByVertexType(SecToken, TransToken, TagDBType, "TaggedWebsites");
#region Get all instances of the VertexTypes
//how to get all instances of a type from the DB
Stopwatch watch1 = Stopwatch.StartNew();
var TagInstances = _GraphDS_Service.GetVerticesByType(SecToken, TransToken, TagDBType);
watch1.Stop();
Console.WriteLine(watch1.Elapsed.TotalMilliseconds);
watch1.Reset();
watch1.Start();
TagInstances = _GraphDS_Service.GetVerticesByType(SecToken, TransToken, TagDBType);
watch1.Stop();
Console.WriteLine(watch1.Elapsed.TotalMilliseconds);
var WebsiteInstances = _GraphDS_Service.GetVerticesByType(SecToken, TransToken, WebsiteDBType);
#endregion
#region Iterate over all instances
Console.WriteLine("Collect all vertex instances of type " + WebsiteDBType.Name + ":");
foreach (var item in WebsiteInstances)
{
//to get the value of a property of an instance, you need the property ID
//(that's why we fetched the type from DB an read out the property definition of property "Name")
var name = _VertexInstanceService.GetPropertyAsStringByVertexInstance(SecToken, TransToken, item, WebPropName.ID);
var url = _VertexInstanceService.GetPropertyAsStringByVertexInstance(SecToken, TransToken, item, WebPropURL.ID);
Console.WriteLine("Vertex instance: " + name + " | URL: " + url);
}
Console.WriteLine(Environment.NewLine);
Console.WriteLine("Collect all vertex instances of type " + TagDBType.Name + ":");
foreach (var item in TagInstances)
{
var vertexname = _VertexInstanceService.GetPropertyAsStringByVertexInstance(SecToken, TransToken, item, TagPropName.ID);
var edges = _VertexInstanceService.GetOutgoingHyperEdge(SecToken, TransToken, item, TagWebsite.ID).SingleEdges;
Console.Write(vertexname + " points to: ");
foreach (var edge in edges)
{
var name = _VertexInstanceService.GetPropertyAsStringByVertexInstance(SecToken, TransToken, edge.TargetVertex, WebPropName.ID);
Console.Write(" |-->" + name + " ");
}
Console.Write(Environment.NewLine);
}
#endregion
#region How to use Expressions to filter like a 'Where'
//We want to search through an property
var PropExpression = new ServicePropertyExpression();
PropExpression.NameOfProperty = "Name";
PropExpression.NameOfVertexType = "Website";
//Single Constances are SingleLiteralExpression, there are also Range and Multiple Literals
var SingleExpression = new ServiceSingleLiteralExpression();
SingleExpression.Constant = "CNN";
//BinaryExpression With a Left Statement, an Operator and a Right Statement
var BinExpression = new ServiceBinaryExpression();
BinExpression.Right = PropExpression;
BinExpression.Left = SingleExpression;
BinExpression.Operator = ServiceBinaryOperator.Equals;
//In this case we query the Vertices "Where Name = 'CNN'". That's just one vertex ;)
var a = _GraphDS_Service.GetVerticesByExpression(SecToken, TransToken, BinExpression);
Console.WriteLine("\r\nExpression was: Name(Property) = (Equals) 'CNN'");
Console.WriteLine("Expression Result: " + a.Count + " affected Vertices");
#endregion
#endregion
}
