public void SelectBest() // Select the best fragment with the highest relevance which is not disabled (that is, compatible with other selections)
{
var relevantAlternatives = Alternatives.Where(f => f.IsRelevant == true);
double bestRelevance = relevantAlternatives.Max(f => f.Relevance);
RecommendedFragment <T> bestFragment = relevantAlternatives.First(f => f.Relevance == bestRelevance);
SelectedFragment = bestFragment; // Can be null which means reset selection
}
public override void Recommend()
{
base.Recommend();
// Add more for aggregations
MeasureDimensions.Alternatives.Clear();
if (this.TargetSet != null)
{
foreach (ComColumn dim in this.TargetSet.GreaterDims)
{
var frag = new RecommendedFragment <ComColumn>(dim, 1.0);
MeasureDimensions.Alternatives.Add(frag);
}
}
AggregationFunctions.Alternatives.Clear();
AggregationFunctions.Alternatives.Add(new RecommendedFragment <string>("SUM", 1.0));
AggregationFunctions.Alternatives.Add(new RecommendedFragment <string>("AVG", 1.0));
}
/// <summary>
/// Find all possible relationship paths from this set to the specified destination set via the specified lesser set.
/// </summary>
public override void Recommend()
{
//
// 1. Find all possible lesser sets (relationship or fact sets)
//
var lesserSets = new List <ComTable>();
if (this.FactSet != null) // Lesser set is provided
{
lesserSets.Add(this.FactSet);
}
else // Generate all possible lesser sets
{
// All least sets of the source set(s)
var allPaths = new PathEnumerator(null, new List <ComTable> {
this.SourceSet
}, true, DimensionType.IDENTITY_ENTITY).ToList();
// All lesser sets of the source set(s)
foreach (var path in allPaths)
{
foreach (ComColumn seg in path.Path)
{
if (!lesserSets.Contains(seg.LesserSet))
{
lesserSets.Add(seg.LesserSet);
}
}
}
}
//
// 2. Given a lesser set, find all relationship paths as pairs of <grouping path, measure path>
//
foreach (ComTable set in lesserSets)
{
var gPaths = new PathEnumerator(new List <ComTable> {
set
}, new List <ComTable> {
this.SourceSet
}, false, DimensionType.IDENTITY_ENTITY).ToList();
var mPaths = new PathEnumerator(new List <ComTable> {
set
}, new List <ComTable> {
this.TargetSet
}, false, DimensionType.IDENTITY_ENTITY).ToList();
if (gPaths.Count == 0)
{
continue; // In fact, there must be at least one path - because the set is known to be a lesser set
}
if (set == this.TargetSet) // Target (measure) set is the same as fact set
{
List <ComColumn> loop = new List <ComColumn>();
loop.Add(new Dim(set));
mPaths.Add(new DimPath(loop));
}
if (mPaths.Count == 0)
{
continue;
}
RecommendedFragment <ComTable> frag = new RecommendedFragment <ComTable>(set, 1.0);
this.FactSets.Alternatives.Add(frag);
gPaths.ForEach(gp => this.GroupingPaths.Alternatives.Add(new RecommendedFragment <List <ComColumn> >(gp.Path, 1.0)));
mPaths.ForEach(mp => this.MeasurePaths.Alternatives.Add(new RecommendedFragment <List <ComColumn> >(mp.Path, 1.0)));
// For each pair of grouping paths build a complete relationship path
foreach (var gp in gPaths)
{
foreach (var mp in mPaths)
{
this.Recommendations.Alternatives.Add(new RecommendedFragment <object>(null, 1.0)); // TODO: build complete path or an object (tuple of indexes) representing a complete path
}
}
}
}
