public virtual ObjectFeatureProvider GetObjectSubsetProvider(ObjectFeatureFilter filter)
{
Contract.Requires(filter != null);
Contract.Ensures(Contract.Result<ObjectFeatureProvider>() != null);
return new ObjectFeatureProvider(this, filter);
}
private ObjectFeatureProvider(ObjectFeatureProvider baseProvider, ObjectFeatureFilter filter)
{
Contract.Requires(baseProvider != null);
Contract.Requires(filter != null);
entries = baseProvider.entries;
SourceList = ApplyFilter(baseProvider.SourceList, filter);
}
private IList ApplyFilter(IList sourceList, ObjectFeatureFilter filter)
{
Contract.Requires(entries != null);
Contract.Requires(entries.Length > 0);
if (filter == null) return sourceList;
var filteredList = new ArrayList();
for (int idx = 0; idx < sourceList.Count; idx++)
{
object obj = sourceList[idx];
var values = entries.ToDictionary(e => e.Description.ID, e => e.GetValue(obj));
if (filter(idx, values)) filteredList.Add(obj);
}
return filteredList.ToArray();
}
public ObjectFeatureProvider(IList sourceList, Strings featureProjections, ObjectFeatureFilter filter = null)
{
Contract.Requires(sourceList != null);
Contract.Requires(featureProjections != null);
Contract.Requires(sourceList.Count > 0);
Contract.Requires(featureProjections.Count > 0);
entries = featureProjections.Select(p => new Entry(this, p, GetObjectType(sourceList), sourceList)).ToArray();
SourceList = ApplyFilter(sourceList, filter);
}
