// Factory method
public static RankingFeatureHelper Create(RankingFeature rankingFeature)
{
RankingFeatureHelper helper = null;
if (rankingFeature is StaticRank)
{
helper = new StaticRankFeatureHelper((StaticRank)rankingFeature);
}
else if (rankingFeature is BucketedStatic)
{
helper = new BucketedStaticHelper((BucketedStatic)rankingFeature);
}
else if (rankingFeature is BM25)
{
helper = new BM25Helper((BM25)rankingFeature);
}
else if (rankingFeature is MinSpan)
{
helper = new MinSpanHelper((MinSpan)rankingFeature);
}
else if (rankingFeature is Dynamic)
{
helper = new DynamicHelper((Dynamic)rankingFeature);
}
else
{
throw new Exception("Unknown Ranking Feature type: " + rankingFeature.GetType().Name);
}
return(helper);
}
public static IRankingFeatureFormatter SelectFormatter(RankingFeature rankFeature)
{
if (rankFeature is BM25)
{
return(new BM25Formatter((BM25)rankFeature));
}
else if (rankFeature is BucketedStatic)
{
return(new BucketedStaticFormatter((BucketedStatic)rankFeature));
}
else if (rankFeature is Dynamic)
{
return(new DynamicFeatureFormatter((Dynamic)rankFeature));
}
else if (rankFeature is StaticRank)
{
return(new StaticRankFormatter((StaticRank)rankFeature));
}
else if (rankFeature is MinSpan)
{
return(new MinSpanRankFormatter((MinSpan)rankFeature));
}
else
{
return(new NullRankingFeatureFormatter());
}
}