Lucene.Net.Search.MultiPhraseQuery.MultiPhraseWeight.Explain C# (CSharp) Method

			public override Explanation Explain(IndexReader reader, int doc)
			{
				ComplexExplanation result = new ComplexExplanation();
				result.Description = "weight(" + Query + " in " + doc + "), product of:";
				
				Explanation idfExpl = new Explanation(idf, "idf(" + Query + ")");
				
				// explain query weight
				Explanation queryExpl = new Explanation();
				queryExpl.Description = "queryWeight(" + Query + "), product of:";
				
				Explanation boostExpl = new Explanation(Enclosing_Instance.Boost, "boost");
				if (Enclosing_Instance.Boost != 1.0f)
					queryExpl.AddDetail(boostExpl);
				
				queryExpl.AddDetail(idfExpl);
				
				Explanation queryNormExpl = new Explanation(queryNorm, "queryNorm");
				queryExpl.AddDetail(queryNormExpl);
				
				queryExpl.Value = boostExpl.Value * idfExpl.Value * queryNormExpl.Value;
				
				result.AddDetail(queryExpl);
				
				// explain field weight
				ComplexExplanation fieldExpl = new ComplexExplanation();
				fieldExpl.Description = "fieldWeight(" + Query + " in " + doc + "), product of:";

                PhraseScorer scorer = (PhraseScorer)Scorer(reader, true, false);
				if (scorer == null)
				{
					return new Explanation(0.0f, "no matching docs");
				}
				Explanation tfExplanation = new Explanation();
			    int d = scorer.Advance(doc);
			    float phraseFreq = (d == doc) ? scorer.CurrentFreq() : 0.0f;
                tfExplanation.Value = similarity.Tf(phraseFreq);
                tfExplanation.Description = "tf(phraseFreq=" + phraseFreq + ")";
                fieldExpl.AddDetail(tfExplanation);
				fieldExpl.AddDetail(idfExpl);
				
				Explanation fieldNormExpl = new Explanation();
				byte[] fieldNorms = reader.Norms(Enclosing_Instance.field);
				float fieldNorm = fieldNorms != null?Similarity.DecodeNorm(fieldNorms[doc]):1.0f;
				fieldNormExpl.Value = fieldNorm;
				fieldNormExpl.Description = "fieldNorm(field=" + Enclosing_Instance.field + ", doc=" + doc + ")";
				fieldExpl.AddDetail(fieldNormExpl);
				
				fieldExpl.Match = tfExplanation.IsMatch;
                fieldExpl.Value = tfExplanation.Value * idfExpl.Value * fieldNormExpl.Value;
				
				result.AddDetail(fieldExpl);
				System.Boolean? tempAux = fieldExpl.Match;
				result.Match = tempAux;
				
				// combine them
				result.Value = queryExpl.Value * fieldExpl.Value;
				
				if (queryExpl.Value == 1.0f)
					return fieldExpl;
				
				return result;
			}
		}