https://lucene.apache.org/lucene-parent/lucene-core: Apache Lucene Java Core (The Apache Software Foundation) 
public class org.apache.lucene.search.similarities.BM25Similarity extends org.apache.lucene.search.similarities.Similarity
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.apache.lucene.search.similarities.BM25Similarity
  super_class: org.apache.lucene.search.similarities.Similarity
{
  private final float k1;
    descriptor: F
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private final float b;
    descriptor: F
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  protected boolean discountOverlaps;
    descriptor: Z
    flags: (0x0004) ACC_PROTECTED

  private static final float[] LENGTH_TABLE;
    descriptor: [F
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=3, locals=1, args_size=0
         0: .line 106
            sipush 256
            newarray 6
            putstatic org.apache.lucene.search.similarities.BM25Similarity.LENGTH_TABLE:[F
         1: .line 109
            iconst_0
            istore 0 /* i */
        start local 0 // int i
         2: goto 5
         3: .line 110
      StackMap locals: int
      StackMap stack:
            getstatic org.apache.lucene.search.similarities.BM25Similarity.LENGTH_TABLE:[F
            iload 0 /* i */
            iload 0 /* i */
            i2b
            invokestatic org.apache.lucene.util.SmallFloat.byte4ToInt:(B)I
            i2f
            fastore
         4: .line 109
            iinc 0 /* i */ 1
      StackMap locals:
      StackMap stack:
         5: iload 0 /* i */
            sipush 256
            if_icmplt 3
        end local 0 // int i
         6: .line 112
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            2    6     0     i  I

  public void <init>(float, float);
    descriptor: (FF)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=3, args_size=3
        start local 0 // org.apache.lucene.search.similarities.BM25Similarity this
        start local 1 // float k1
        start local 2 // float b
         0: .line 48
            aload 0 /* this */
            invokespecial org.apache.lucene.search.similarities.Similarity.<init>:()V
         1: .line 88
            aload 0 /* this */
            iconst_1
            putfield org.apache.lucene.search.similarities.BM25Similarity.discountOverlaps:Z
         2: .line 49
            fload 1 /* k1 */
            invokestatic java.lang.Float.isFinite:(F)Z
            ifeq 3
            fload 1 /* k1 */
            fconst_0
            fcmpg
            ifge 4
         3: .line 50
      StackMap locals: org.apache.lucene.search.similarities.BM25Similarity float float
      StackMap stack:
            new java.lang.IllegalArgumentException
            dup
            new java.lang.StringBuilder
            dup
            ldc "illegal k1 value: "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            fload 1 /* k1 */
            invokevirtual java.lang.StringBuilder.append:(F)Ljava/lang/StringBuilder;
            ldc ", must be a non-negative finite value"
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;)V
            athrow
         4: .line 52
      StackMap locals:
      StackMap stack:
            fload 2 /* b */
            invokestatic java.lang.Float.isNaN:(F)Z
            ifne 5
            fload 2 /* b */
            fconst_0
            fcmpg
            iflt 5
            fload 2 /* b */
            fconst_1
            fcmpl
            ifle 6
         5: .line 53
      StackMap locals:
      StackMap stack:
            new java.lang.IllegalArgumentException
            dup
            new java.lang.StringBuilder
            dup
            ldc "illegal b value: "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            fload 2 /* b */
            invokevirtual java.lang.StringBuilder.append:(F)Ljava/lang/StringBuilder;
            ldc ", must be between 0 and 1"
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;)V
            athrow
         6: .line 55
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            fload 1 /* k1 */
            putfield org.apache.lucene.search.similarities.BM25Similarity.k1:F
         7: .line 56
            aload 0 /* this */
            fload 2 /* b */
            putfield org.apache.lucene.search.similarities.BM25Similarity.b:F
         8: .line 57
            return
        end local 2 // float b
        end local 1 // float k1
        end local 0 // org.apache.lucene.search.similarities.BM25Similarity this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    9     0  this  Lorg/apache/lucene/search/similarities/BM25Similarity;
            0    9     1    k1  F
            0    9     2     b  F
    MethodParameters:
      Name  Flags
      k1    
      b     

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // org.apache.lucene.search.similarities.BM25Similarity this
         0: .line 66
            aload 0 /* this */
            ldc 1.2
            ldc 0.75
            invokespecial org.apache.lucene.search.similarities.BM25Similarity.<init>:(FF)V
         1: .line 67
            return
        end local 0 // org.apache.lucene.search.similarities.BM25Similarity this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lorg/apache/lucene/search/similarities/BM25Similarity;

  protected float idf(long, long);
    descriptor: (JJ)F
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=8, locals=5, args_size=3
        start local 0 // org.apache.lucene.search.similarities.BM25Similarity this
        start local 1 // long docFreq
        start local 3 // long docCount
         0: .line 71
            dconst_1
            lload 3 /* docCount */
            lload 1 /* docFreq */
            lsub
            l2d
            ldc 0.5
            dadd
            lload 1 /* docFreq */
            l2d
            ldc 0.5
            dadd
            ddiv
            dadd
            invokestatic java.lang.Math.log:(D)D
            d2f
            freturn
        end local 3 // long docCount
        end local 1 // long docFreq
        end local 0 // org.apache.lucene.search.similarities.BM25Similarity this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    1     0      this  Lorg/apache/lucene/search/similarities/BM25Similarity;
            0    1     1   docFreq  J
            0    1     3  docCount  J
    MethodParameters:
          Name  Flags
      docFreq   
      docCount  

  protected float scorePayload(int, int, int, org.apache.lucene.util.BytesRef);
    descriptor: (IIILorg/apache/lucene/util/BytesRef;)F
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=1, locals=5, args_size=5
        start local 0 // org.apache.lucene.search.similarities.BM25Similarity this
        start local 1 // int doc
        start local 2 // int start
        start local 3 // int end
        start local 4 // org.apache.lucene.util.BytesRef payload
         0: .line 76
            fconst_1
            freturn
        end local 4 // org.apache.lucene.util.BytesRef payload
        end local 3 // int end
        end local 2 // int start
        end local 1 // int doc
        end local 0 // org.apache.lucene.search.similarities.BM25Similarity this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    1     0     this  Lorg/apache/lucene/search/similarities/BM25Similarity;
            0    1     1      doc  I
            0    1     2    start  I
            0    1     3      end  I
            0    1     4  payload  Lorg/apache/lucene/util/BytesRef;
    MethodParameters:
         Name  Flags
      doc      
      start    
      end      
      payload  

  protected float avgFieldLength(org.apache.lucene.search.CollectionStatistics);
    descriptor: (Lorg/apache/lucene/search/CollectionStatistics;)F
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=4, locals=2, args_size=2
        start local 0 // org.apache.lucene.search.similarities.BM25Similarity this
        start local 1 // org.apache.lucene.search.CollectionStatistics collectionStats
         0: .line 81
            aload 1 /* collectionStats */
            invokevirtual org.apache.lucene.search.CollectionStatistics.sumTotalTermFreq:()J
            l2d
            aload 1 /* collectionStats */
            invokevirtual org.apache.lucene.search.CollectionStatistics.docCount:()J
            l2d
            ddiv
            d2f
            freturn
        end local 1 // org.apache.lucene.search.CollectionStatistics collectionStats
        end local 0 // org.apache.lucene.search.similarities.BM25Similarity this
      LocalVariableTable:
        Start  End  Slot             Name  Signature
            0    1     0             this  Lorg/apache/lucene/search/similarities/BM25Similarity;
            0    1     1  collectionStats  Lorg/apache/lucene/search/CollectionStatistics;
    MethodParameters:
                 Name  Flags
      collectionStats  

  public void setDiscountOverlaps(boolean);
    descriptor: (Z)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.apache.lucene.search.similarities.BM25Similarity this
        start local 1 // boolean v
         0: .line 94
            aload 0 /* this */
            iload 1 /* v */
            putfield org.apache.lucene.search.similarities.BM25Similarity.discountOverlaps:Z
         1: .line 95
            return
        end local 1 // boolean v
        end local 0 // org.apache.lucene.search.similarities.BM25Similarity this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lorg/apache/lucene/search/similarities/BM25Similarity;
            0    2     1     v  Z
    MethodParameters:
      Name  Flags
      v     

  public boolean getDiscountOverlaps();
    descriptor: ()Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.apache.lucene.search.similarities.BM25Similarity this
         0: .line 102
            aload 0 /* this */
            getfield org.apache.lucene.search.similarities.BM25Similarity.discountOverlaps:Z
            ireturn
        end local 0 // org.apache.lucene.search.similarities.BM25Similarity this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/apache/lucene/search/similarities/BM25Similarity;

  public final long computeNorm(org.apache.lucene.index.FieldInvertState);
    descriptor: (Lorg/apache/lucene/index/FieldInvertState;)J
    flags: (0x0011) ACC_PUBLIC, ACC_FINAL
    Code:
      stack=2, locals=3, args_size=2
        start local 0 // org.apache.lucene.search.similarities.BM25Similarity this
        start local 1 // org.apache.lucene.index.FieldInvertState state
         0: .line 118
            aload 1 /* state */
            invokevirtual org.apache.lucene.index.FieldInvertState.getIndexOptions:()Lorg/apache/lucene/index/IndexOptions;
            getstatic org.apache.lucene.index.IndexOptions.DOCS:Lorg/apache/lucene/index/IndexOptions;
            if_acmpne 3
            aload 1 /* state */
            invokevirtual org.apache.lucene.index.FieldInvertState.getIndexCreatedVersionMajor:()I
            bipush 8
            if_icmplt 3
         1: .line 119
            aload 1 /* state */
            invokevirtual org.apache.lucene.index.FieldInvertState.getUniqueTermCount:()I
            istore 2 /* numTerms */
        start local 2 // int numTerms
         2: .line 120
            goto 7
        end local 2 // int numTerms
      StackMap locals:
      StackMap stack:
         3: aload 0 /* this */
            getfield org.apache.lucene.search.similarities.BM25Similarity.discountOverlaps:Z
            ifeq 6
         4: .line 121
            aload 1 /* state */
            invokevirtual org.apache.lucene.index.FieldInvertState.getLength:()I
            aload 1 /* state */
            invokevirtual org.apache.lucene.index.FieldInvertState.getNumOverlap:()I
            isub
            istore 2 /* numTerms */
        start local 2 // int numTerms
         5: .line 122
            goto 7
        end local 2 // int numTerms
         6: .line 123
      StackMap locals:
      StackMap stack:
            aload 1 /* state */
            invokevirtual org.apache.lucene.index.FieldInvertState.getLength:()I
            istore 2 /* numTerms */
        start local 2 // int numTerms
         7: .line 125
      StackMap locals: int
      StackMap stack:
            iload 2 /* numTerms */
            invokestatic org.apache.lucene.util.SmallFloat.intToByte4:(I)B
            i2l
            lreturn
        end local 2 // int numTerms
        end local 1 // org.apache.lucene.index.FieldInvertState state
        end local 0 // org.apache.lucene.search.similarities.BM25Similarity this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    8     0      this  Lorg/apache/lucene/search/similarities/BM25Similarity;
            0    8     1     state  Lorg/apache/lucene/index/FieldInvertState;
            2    3     2  numTerms  I
            5    6     2  numTerms  I
            7    8     2  numTerms  I
    MethodParameters:
       Name  Flags
      state  

  public org.apache.lucene.search.Explanation idfExplain(org.apache.lucene.search.CollectionStatistics, org.apache.lucene.search.TermStatistics);
    descriptor: (Lorg/apache/lucene/search/CollectionStatistics;Lorg/apache/lucene/search/TermStatistics;)Lorg/apache/lucene/search/Explanation;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=8, locals=8, args_size=3
        start local 0 // org.apache.lucene.search.similarities.BM25Similarity this
        start local 1 // org.apache.lucene.search.CollectionStatistics collectionStats
        start local 2 // org.apache.lucene.search.TermStatistics termStats
         0: .line 151
            aload 2 /* termStats */
            invokevirtual org.apache.lucene.search.TermStatistics.docFreq:()J
            lstore 3 /* df */
        start local 3 // long df
         1: .line 152
            aload 1 /* collectionStats */
            invokevirtual org.apache.lucene.search.CollectionStatistics.docCount:()J
            lstore 5 /* docCount */
        start local 5 // long docCount
         2: .line 153
            aload 0 /* this */
            lload 3 /* df */
            lload 5 /* docCount */
            invokevirtual org.apache.lucene.search.similarities.BM25Similarity.idf:(JJ)F
            fstore 7 /* idf */
        start local 7 // float idf
         3: .line 154
            fload 7 /* idf */
            invokestatic java.lang.Float.valueOf:(F)Ljava/lang/Float;
            ldc "idf, computed as log(1 + (N - n + 0.5) / (n + 0.5)) from:"
            iconst_2
            anewarray org.apache.lucene.search.Explanation
            dup
            iconst_0
         4: .line 155
            lload 3 /* df */
            invokestatic java.lang.Long.valueOf:(J)Ljava/lang/Long;
            ldc "n, number of documents containing term"
            iconst_0
            anewarray org.apache.lucene.search.Explanation
            invokestatic org.apache.lucene.search.Explanation.match:(Ljava/lang/Number;Ljava/lang/String;[Lorg/apache/lucene/search/Explanation;)Lorg/apache/lucene/search/Explanation;
            aastore
            dup
            iconst_1
         5: .line 156
            lload 5 /* docCount */
            invokestatic java.lang.Long.valueOf:(J)Ljava/lang/Long;
            ldc "N, total number of documents with field"
            iconst_0
            anewarray org.apache.lucene.search.Explanation
            invokestatic org.apache.lucene.search.Explanation.match:(Ljava/lang/Number;Ljava/lang/String;[Lorg/apache/lucene/search/Explanation;)Lorg/apache/lucene/search/Explanation;
            aastore
         6: .line 154
            invokestatic org.apache.lucene.search.Explanation.match:(Ljava/lang/Number;Ljava/lang/String;[Lorg/apache/lucene/search/Explanation;)Lorg/apache/lucene/search/Explanation;
            areturn
        end local 7 // float idf
        end local 5 // long docCount
        end local 3 // long df
        end local 2 // org.apache.lucene.search.TermStatistics termStats
        end local 1 // org.apache.lucene.search.CollectionStatistics collectionStats
        end local 0 // org.apache.lucene.search.similarities.BM25Similarity this
      LocalVariableTable:
        Start  End  Slot             Name  Signature
            0    7     0             this  Lorg/apache/lucene/search/similarities/BM25Similarity;
            0    7     1  collectionStats  Lorg/apache/lucene/search/CollectionStatistics;
            0    7     2        termStats  Lorg/apache/lucene/search/TermStatistics;
            1    7     3               df  J
            2    7     5         docCount  J
            3    7     7              idf  F
    MethodParameters:
                 Name  Flags
      collectionStats  
      termStats        

  public org.apache.lucene.search.Explanation idfExplain(org.apache.lucene.search.CollectionStatistics, org.apache.lucene.search.TermStatistics[]);
    descriptor: (Lorg/apache/lucene/search/CollectionStatistics;[Lorg/apache/lucene/search/TermStatistics;)Lorg/apache/lucene/search/Explanation;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=11, args_size=3
        start local 0 // org.apache.lucene.search.similarities.BM25Similarity this
        start local 1 // org.apache.lucene.search.CollectionStatistics collectionStats
        start local 2 // org.apache.lucene.search.TermStatistics[] termStats
         0: .line 173
            dconst_0
            dstore 3 /* idf */
        start local 3 // double idf
         1: .line 174
            new java.util.ArrayList
            dup
            invokespecial java.util.ArrayList.<init>:()V
            astore 5 /* details */
        start local 5 // java.util.List details
         2: .line 175
            aload 2 /* termStats */
            dup
            astore 9
            arraylength
            istore 8
            iconst_0
            istore 7
            goto 8
      StackMap locals: org.apache.lucene.search.similarities.BM25Similarity org.apache.lucene.search.CollectionStatistics org.apache.lucene.search.TermStatistics[] double java.util.List top int int org.apache.lucene.search.TermStatistics[]
      StackMap stack:
         3: aload 9
            iload 7
            aaload
            astore 6 /* stat */
        start local 6 // org.apache.lucene.search.TermStatistics stat
         4: .line 176
            aload 0 /* this */
            aload 1 /* collectionStats */
            aload 6 /* stat */
            invokevirtual org.apache.lucene.search.similarities.BM25Similarity.idfExplain:(Lorg/apache/lucene/search/CollectionStatistics;Lorg/apache/lucene/search/TermStatistics;)Lorg/apache/lucene/search/Explanation;
            astore 10 /* idfExplain */
        start local 10 // org.apache.lucene.search.Explanation idfExplain
         5: .line 177
            aload 5 /* details */
            aload 10 /* idfExplain */
            invokeinterface java.util.List.add:(Ljava/lang/Object;)Z
            pop
         6: .line 178
            dload 3 /* idf */
            aload 10 /* idfExplain */
            invokevirtual org.apache.lucene.search.Explanation.getValue:()Ljava/lang/Number;
            invokevirtual java.lang.Number.floatValue:()F
            f2d
            dadd
            dstore 3 /* idf */
        end local 10 // org.apache.lucene.search.Explanation idfExplain
        end local 6 // org.apache.lucene.search.TermStatistics stat
         7: .line 175
            iinc 7 1
      StackMap locals:
      StackMap stack:
         8: iload 7
            iload 8
            if_icmplt 3
         9: .line 180
            dload 3 /* idf */
            d2f
            invokestatic java.lang.Float.valueOf:(F)Ljava/lang/Float;
            ldc "idf, sum of:"
            aload 5 /* details */
            invokestatic org.apache.lucene.search.Explanation.match:(Ljava/lang/Number;Ljava/lang/String;Ljava/util/Collection;)Lorg/apache/lucene/search/Explanation;
            areturn
        end local 5 // java.util.List details
        end local 3 // double idf
        end local 2 // org.apache.lucene.search.TermStatistics[] termStats
        end local 1 // org.apache.lucene.search.CollectionStatistics collectionStats
        end local 0 // org.apache.lucene.search.similarities.BM25Similarity this
      LocalVariableTable:
        Start  End  Slot             Name  Signature
            0   10     0             this  Lorg/apache/lucene/search/similarities/BM25Similarity;
            0   10     1  collectionStats  Lorg/apache/lucene/search/CollectionStatistics;
            0   10     2        termStats  [Lorg/apache/lucene/search/TermStatistics;
            1   10     3              idf  D
            2   10     5          details  Ljava/util/List<Lorg/apache/lucene/search/Explanation;>;
            4    7     6             stat  Lorg/apache/lucene/search/TermStatistics;
            5    7    10       idfExplain  Lorg/apache/lucene/search/Explanation;
    MethodParameters:
                 Name  Flags
      collectionStats  
      termStats        

  public final org.apache.lucene.search.similarities.Similarity$SimScorer scorer(float, org.apache.lucene.search.CollectionStatistics, org.apache.lucene.search.TermStatistics[]);
    descriptor: (FLorg/apache/lucene/search/CollectionStatistics;[Lorg/apache/lucene/search/TermStatistics;)Lorg/apache/lucene/search/similarities/Similarity$SimScorer;
    flags: (0x0091) ACC_PUBLIC, ACC_FINAL, ACC_VARARGS
    Code:
      stack=8, locals=8, args_size=4
        start local 0 // org.apache.lucene.search.similarities.BM25Similarity this
        start local 1 // float boost
        start local 2 // org.apache.lucene.search.CollectionStatistics collectionStats
        start local 3 // org.apache.lucene.search.TermStatistics[] termStats
         0: .line 185
            aload 3 /* termStats */
            arraylength
            iconst_1
            if_icmpne 1
            aload 0 /* this */
            aload 2 /* collectionStats */
            aload 3 /* termStats */
            iconst_0
            aaload
            invokevirtual org.apache.lucene.search.similarities.BM25Similarity.idfExplain:(Lorg/apache/lucene/search/CollectionStatistics;Lorg/apache/lucene/search/TermStatistics;)Lorg/apache/lucene/search/Explanation;
            goto 2
      StackMap locals:
      StackMap stack:
         1: aload 0 /* this */
            aload 2 /* collectionStats */
            aload 3 /* termStats */
            invokevirtual org.apache.lucene.search.similarities.BM25Similarity.idfExplain:(Lorg/apache/lucene/search/CollectionStatistics;[Lorg/apache/lucene/search/TermStatistics;)Lorg/apache/lucene/search/Explanation;
      StackMap locals:
      StackMap stack: org.apache.lucene.search.Explanation
         2: astore 4 /* idf */
        start local 4 // org.apache.lucene.search.Explanation idf
         3: .line 186
            aload 0 /* this */
            aload 2 /* collectionStats */
            invokevirtual org.apache.lucene.search.similarities.BM25Similarity.avgFieldLength:(Lorg/apache/lucene/search/CollectionStatistics;)F
            fstore 5 /* avgdl */
        start local 5 // float avgdl
         4: .line 188
            sipush 256
            newarray 6
            astore 6 /* cache */
        start local 6 // float[] cache
         5: .line 189
            iconst_0
            istore 7 /* i */
        start local 7 // int i
         6: goto 9
         7: .line 190
      StackMap locals: org.apache.lucene.search.similarities.BM25Similarity float org.apache.lucene.search.CollectionStatistics org.apache.lucene.search.TermStatistics[] org.apache.lucene.search.Explanation float float[] int
      StackMap stack:
            aload 6 /* cache */
            iload 7 /* i */
            fconst_1
            aload 0 /* this */
            getfield org.apache.lucene.search.similarities.BM25Similarity.k1:F
            fconst_1
            aload 0 /* this */
            getfield org.apache.lucene.search.similarities.BM25Similarity.b:F
            fsub
            aload 0 /* this */
            getfield org.apache.lucene.search.similarities.BM25Similarity.b:F
            getstatic org.apache.lucene.search.similarities.BM25Similarity.LENGTH_TABLE:[F
            iload 7 /* i */
            faload
            fmul
            fload 5 /* avgdl */
            fdiv
            fadd
            fmul
            fdiv
            fastore
         8: .line 189
            iinc 7 /* i */ 1
      StackMap locals:
      StackMap stack:
         9: iload 7 /* i */
            aload 6 /* cache */
            arraylength
            if_icmplt 7
        end local 7 // int i
        10: .line 192
            new org.apache.lucene.search.similarities.BM25Similarity$BM25Scorer
            dup
            fload 1 /* boost */
            aload 0 /* this */
            getfield org.apache.lucene.search.similarities.BM25Similarity.k1:F
            aload 0 /* this */
            getfield org.apache.lucene.search.similarities.BM25Similarity.b:F
            aload 4 /* idf */
            fload 5 /* avgdl */
            aload 6 /* cache */
            invokespecial org.apache.lucene.search.similarities.BM25Similarity$BM25Scorer.<init>:(FFFLorg/apache/lucene/search/Explanation;F[F)V
            areturn
        end local 6 // float[] cache
        end local 5 // float avgdl
        end local 4 // org.apache.lucene.search.Explanation idf
        end local 3 // org.apache.lucene.search.TermStatistics[] termStats
        end local 2 // org.apache.lucene.search.CollectionStatistics collectionStats
        end local 1 // float boost
        end local 0 // org.apache.lucene.search.similarities.BM25Similarity this
      LocalVariableTable:
        Start  End  Slot             Name  Signature
            0   11     0             this  Lorg/apache/lucene/search/similarities/BM25Similarity;
            0   11     1            boost  F
            0   11     2  collectionStats  Lorg/apache/lucene/search/CollectionStatistics;
            0   11     3        termStats  [Lorg/apache/lucene/search/TermStatistics;
            3   11     4              idf  Lorg/apache/lucene/search/Explanation;
            4   11     5            avgdl  F
            5   11     6            cache  [F
            6   10     7                i  I
    MethodParameters:
                 Name  Flags
      boost            
      collectionStats  
      termStats        

  public java.lang.String toString();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // org.apache.lucene.search.similarities.BM25Similarity this
         0: .line 281
            new java.lang.StringBuilder
            dup
            ldc "BM25(k1="
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 0 /* this */
            getfield org.apache.lucene.search.similarities.BM25Similarity.k1:F
            invokevirtual java.lang.StringBuilder.append:(F)Ljava/lang/StringBuilder;
            ldc ",b="
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            aload 0 /* this */
            getfield org.apache.lucene.search.similarities.BM25Similarity.b:F
            invokevirtual java.lang.StringBuilder.append:(F)Ljava/lang/StringBuilder;
            ldc ")"
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            areturn
        end local 0 // org.apache.lucene.search.similarities.BM25Similarity this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/apache/lucene/search/similarities/BM25Similarity;

  public final float getK1();
    descriptor: ()F
    flags: (0x0011) ACC_PUBLIC, ACC_FINAL
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.apache.lucene.search.similarities.BM25Similarity this
         0: .line 289
            aload 0 /* this */
            getfield org.apache.lucene.search.similarities.BM25Similarity.k1:F
            freturn
        end local 0 // org.apache.lucene.search.similarities.BM25Similarity this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/apache/lucene/search/similarities/BM25Similarity;

  public final float getB();
    descriptor: ()F
    flags: (0x0011) ACC_PUBLIC, ACC_FINAL
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.apache.lucene.search.similarities.BM25Similarity this
         0: .line 297
            aload 0 /* this */
            getfield org.apache.lucene.search.similarities.BM25Similarity.b:F
            freturn
        end local 0 // org.apache.lucene.search.similarities.BM25Similarity this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/apache/lucene/search/similarities/BM25Similarity;
}
SourceFile: "BM25Similarity.java"
NestMembers:
  org.apache.lucene.search.similarities.BM25Similarity$BM25Scorer
InnerClasses:
  private BM25Scorer = org.apache.lucene.search.similarities.BM25Similarity$BM25Scorer of org.apache.lucene.search.similarities.BM25Similarity
  public abstract SimScorer = org.apache.lucene.search.similarities.Similarity$SimScorer of org.apache.lucene.search.similarities.Similarity