/// <summary>
/// Tries to load a SPARQL Query/Algebra Optimiser based on information from the Configuration Graph.
/// </summary>
/// <param name="g">Configuration Graph.</param>
/// <param name="objNode">Object Node.</param>
/// <param name="targetType">Target Type.</param>
/// <param name="obj">Output Object.</param>
/// <returns></returns>
public bool TryLoadObject(IGraph g, INode objNode, Type targetType, out object obj)
{
obj = null;
Object temp;
switch (targetType.FullName)
{
case QueryOptimiserDefault:
obj = new DefaultOptimiser();
break;
case QueryOptimiserNoReorder:
obj = new NoReorderOptimiser();
break;
case QueryOptimiserWeighted:
INode statsObj = ConfigurationLoader.GetConfigurationNode(g, objNode, g.CreateUriNode(UriFactory.Create(ConfigurationLoader.PropertyUsingGraph)));
if (statsObj != null)
{
temp = ConfigurationLoader.LoadObject(g, statsObj);
if (temp is IGraph)
{
obj = new WeightedOptimiser((IGraph)temp);
}
else
{
throw new DotNetRdfConfigurationException("Unable to create the Weighted Query Optimiser identified by the Node '" + objNode.ToString() + "' since the dnr:usingGraph property points to an object that cannot be loaded as an Object that imlements the required IGraph interface");
}
}
else
{
obj = new WeightedOptimiser();
}
break;
default:
// Try and create an Algebra Optimiser
try
{
obj = (IAlgebraOptimiser)Activator.CreateInstance(targetType);
}
catch
{
// Any error means this loader can't load this type
return(false);
}
break;
}
// Return true only if we've loaded something into the output object
if (obj != null)
{
return(true);
}
else
{
return(false);
}
}
/// <summary>
/// Tries to load a SPARQL Query/Algebra Optimiser based on information from the Configuration Graph
/// </summary>
/// <param name="g">Configuration Graph</param>
/// <param name="objNode">Object Node</param>
/// <param name="targetType">Target Type</param>
/// <param name="obj">Output Object</param>
/// <returns></returns>
public bool TryLoadObject(IGraph g, INode objNode, Type targetType, out object obj)
{
obj = null;
Object temp;
switch (targetType.FullName)
{
case QueryOptimiserDefault:
obj = new DefaultOptimiser();
break;
case QueryOptimiserNoReorder:
obj = new NoReorderOptimiser();
break;
case QueryOptimiserWeighted:
INode statsObj = ConfigurationLoader.GetConfigurationNode(g, objNode, ConfigurationLoader.CreateConfigurationNode(g, ConfigurationLoader.PropertyUsingGraph));
if (statsObj != null)
{
temp = ConfigurationLoader.LoadObject(g, statsObj);
if (temp is IGraph)
{
obj = new WeightedOptimiser((IGraph)temp);
}
else
{
throw new DotNetRdfConfigurationException("Unable to create the Weighted Query Optimiser identified by the Node '" + objNode.ToString() + "' since the dnr:usingGraph property points to an object that cannot be loaded as an Object that imlements the required IGraph interface");
}
}
else
{
obj = new WeightedOptimiser();
}
break;
default:
//Try and create an Algebra Optimiser
try
{
obj = (IAlgebraOptimiser)Activator.CreateInstance(targetType);
}
catch
{
//Any error means this loader can't load this type
return false;
}
break;
}
//Return true only if we've loaded something into the output object
if (obj != null)
{
return true;
}
else
{
return false;
}
}