http://lucene.apache.org/lucene-parent/lucene-grouping: Lucene Grouping Module (The Apache Software Foundation) 
class org.apache.lucene.search.grouping.AllGroupHeadsCollector$SortingGroupHead<T> extends org.apache.lucene.search.grouping.AllGroupHeadsCollector$GroupHead<T>
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: org.apache.lucene.search.grouping.AllGroupHeadsCollector$SortingGroupHead
  super_class: org.apache.lucene.search.grouping.AllGroupHeadsCollector$GroupHead
{
  final org.apache.lucene.search.FieldComparator[] comparators;
    descriptor: [Lorg/apache/lucene/search/FieldComparator;
    flags: (0x0010) ACC_FINAL

  final org.apache.lucene.search.LeafFieldComparator[] leafComparators;
    descriptor: [Lorg/apache/lucene/search/LeafFieldComparator;
    flags: (0x0010) ACC_FINAL

  protected void <init>(org.apache.lucene.search.Sort, T, int, org.apache.lucene.index.LeafReaderContext, org.apache.lucene.search.Scorable);
    descriptor: (Lorg/apache/lucene/search/Sort;Ljava/lang/Object;ILorg/apache/lucene/index/LeafReaderContext;Lorg/apache/lucene/search/Scorable;)V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=5, locals=8, args_size=6
        start local 0 // org.apache.lucene.search.grouping.AllGroupHeadsCollector$SortingGroupHead this
        start local 1 // org.apache.lucene.search.Sort sort
        start local 2 // java.lang.Object groupValue
        start local 3 // int doc
        start local 4 // org.apache.lucene.index.LeafReaderContext context
        start local 5 // org.apache.lucene.search.Scorable scorer
         0: .line 260
            aload 0 /* this */
            aload 2 /* groupValue */
            iload 3 /* doc */
            aload 4 /* context */
            getfield org.apache.lucene.index.LeafReaderContext.docBase:I
            invokespecial org.apache.lucene.search.grouping.AllGroupHeadsCollector$GroupHead.<init>:(Ljava/lang/Object;II)V
         1: .line 261
            aload 1 /* sort */
            invokevirtual org.apache.lucene.search.Sort.getSort:()[Lorg/apache/lucene/search/SortField;
            astore 6 /* sortFields */
        start local 6 // org.apache.lucene.search.SortField[] sortFields
         2: .line 262
            aload 0 /* this */
            aload 6 /* sortFields */
            arraylength
            anewarray org.apache.lucene.search.FieldComparator
            putfield org.apache.lucene.search.grouping.AllGroupHeadsCollector$SortingGroupHead.comparators:[Lorg/apache/lucene/search/FieldComparator;
         3: .line 263
            aload 0 /* this */
            aload 6 /* sortFields */
            arraylength
            anewarray org.apache.lucene.search.LeafFieldComparator
            putfield org.apache.lucene.search.grouping.AllGroupHeadsCollector$SortingGroupHead.leafComparators:[Lorg/apache/lucene/search/LeafFieldComparator;
         4: .line 264
            iconst_0
            istore 7 /* i */
        start local 7 // int i
         5: goto 12
         6: .line 265
      StackMap locals: org.apache.lucene.search.grouping.AllGroupHeadsCollector$SortingGroupHead org.apache.lucene.search.Sort java.lang.Object int org.apache.lucene.index.LeafReaderContext org.apache.lucene.search.Scorable org.apache.lucene.search.SortField[] int
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.lucene.search.grouping.AllGroupHeadsCollector$SortingGroupHead.comparators:[Lorg/apache/lucene/search/FieldComparator;
            iload 7 /* i */
            aload 6 /* sortFields */
            iload 7 /* i */
            aaload
            iconst_1
            iload 7 /* i */
            invokevirtual org.apache.lucene.search.SortField.getComparator:(II)Lorg/apache/lucene/search/FieldComparator;
            aastore
         7: .line 266
            aload 0 /* this */
            getfield org.apache.lucene.search.grouping.AllGroupHeadsCollector$SortingGroupHead.leafComparators:[Lorg/apache/lucene/search/LeafFieldComparator;
            iload 7 /* i */
            aload 0 /* this */
            getfield org.apache.lucene.search.grouping.AllGroupHeadsCollector$SortingGroupHead.comparators:[Lorg/apache/lucene/search/FieldComparator;
            iload 7 /* i */
            aaload
            aload 4 /* context */
            invokevirtual org.apache.lucene.search.FieldComparator.getLeafComparator:(Lorg/apache/lucene/index/LeafReaderContext;)Lorg/apache/lucene/search/LeafFieldComparator;
            aastore
         8: .line 267
            aload 0 /* this */
            getfield org.apache.lucene.search.grouping.AllGroupHeadsCollector$SortingGroupHead.leafComparators:[Lorg/apache/lucene/search/LeafFieldComparator;
            iload 7 /* i */
            aaload
            aload 5 /* scorer */
            invokeinterface org.apache.lucene.search.LeafFieldComparator.setScorer:(Lorg/apache/lucene/search/Scorable;)V
         9: .line 268
            aload 0 /* this */
            getfield org.apache.lucene.search.grouping.AllGroupHeadsCollector$SortingGroupHead.leafComparators:[Lorg/apache/lucene/search/LeafFieldComparator;
            iload 7 /* i */
            aaload
            iconst_0
            iload 3 /* doc */
            invokeinterface org.apache.lucene.search.LeafFieldComparator.copy:(II)V
        10: .line 269
            aload 0 /* this */
            getfield org.apache.lucene.search.grouping.AllGroupHeadsCollector$SortingGroupHead.leafComparators:[Lorg/apache/lucene/search/LeafFieldComparator;
            iload 7 /* i */
            aaload
            iconst_0
            invokeinterface org.apache.lucene.search.LeafFieldComparator.setBottom:(I)V
        11: .line 264
            iinc 7 /* i */ 1
      StackMap locals:
      StackMap stack:
        12: iload 7 /* i */
            aload 6 /* sortFields */
            arraylength
            if_icmplt 6
        end local 7 // int i
        13: .line 271
            return
        end local 6 // org.apache.lucene.search.SortField[] sortFields
        end local 5 // org.apache.lucene.search.Scorable scorer
        end local 4 // org.apache.lucene.index.LeafReaderContext context
        end local 3 // int doc
        end local 2 // java.lang.Object groupValue
        end local 1 // org.apache.lucene.search.Sort sort
        end local 0 // org.apache.lucene.search.grouping.AllGroupHeadsCollector$SortingGroupHead this
      LocalVariableTable:
        Start  End  Slot        Name  Signature
            0   14     0        this  Lorg/apache/lucene/search/grouping/AllGroupHeadsCollector$SortingGroupHead<TT;>;
            0   14     1        sort  Lorg/apache/lucene/search/Sort;
            0   14     2  groupValue  TT;
            0   14     3         doc  I
            0   14     4     context  Lorg/apache/lucene/index/LeafReaderContext;
            0   14     5      scorer  Lorg/apache/lucene/search/Scorable;
            2   14     6  sortFields  [Lorg/apache/lucene/search/SortField;
            5   13     7           i  I
    Exceptions:
      throws java.io.IOException
    Signature: (Lorg/apache/lucene/search/Sort;TT;ILorg/apache/lucene/index/LeafReaderContext;Lorg/apache/lucene/search/Scorable;)V
    MethodParameters:
            Name  Flags
      sort        
      groupValue  
      doc         
      context     
      scorer      

  public void setNextReader(org.apache.lucene.index.LeafReaderContext);
    descriptor: (Lorg/apache/lucene/index/LeafReaderContext;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=3, args_size=2
        start local 0 // org.apache.lucene.search.grouping.AllGroupHeadsCollector$SortingGroupHead this
        start local 1 // org.apache.lucene.index.LeafReaderContext ctx
         0: .line 275
            aload 0 /* this */
            aload 1 /* ctx */
            invokespecial org.apache.lucene.search.grouping.AllGroupHeadsCollector$GroupHead.setNextReader:(Lorg/apache/lucene/index/LeafReaderContext;)V
         1: .line 276
            iconst_0
            istore 2 /* i */
        start local 2 // int i
         2: goto 5
         3: .line 277
      StackMap locals: int
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.lucene.search.grouping.AllGroupHeadsCollector$SortingGroupHead.leafComparators:[Lorg/apache/lucene/search/LeafFieldComparator;
            iload 2 /* i */
            aload 0 /* this */
            getfield org.apache.lucene.search.grouping.AllGroupHeadsCollector$SortingGroupHead.comparators:[Lorg/apache/lucene/search/FieldComparator;
            iload 2 /* i */
            aaload
            aload 1 /* ctx */
            invokevirtual org.apache.lucene.search.FieldComparator.getLeafComparator:(Lorg/apache/lucene/index/LeafReaderContext;)Lorg/apache/lucene/search/LeafFieldComparator;
            aastore
         4: .line 276
            iinc 2 /* i */ 1
      StackMap locals:
      StackMap stack:
         5: iload 2 /* i */
            aload 0 /* this */
            getfield org.apache.lucene.search.grouping.AllGroupHeadsCollector$SortingGroupHead.comparators:[Lorg/apache/lucene/search/FieldComparator;
            arraylength
            if_icmplt 3
        end local 2 // int i
         6: .line 279
            return
        end local 1 // org.apache.lucene.index.LeafReaderContext ctx
        end local 0 // org.apache.lucene.search.grouping.AllGroupHeadsCollector$SortingGroupHead this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    7     0  this  Lorg/apache/lucene/search/grouping/AllGroupHeadsCollector$SortingGroupHead<TT;>;
            0    7     1   ctx  Lorg/apache/lucene/index/LeafReaderContext;
            2    6     2     i  I
    Exceptions:
      throws java.io.IOException
    MethodParameters:
      Name  Flags
      ctx   

  protected void setScorer(org.apache.lucene.search.Scorable);
    descriptor: (Lorg/apache/lucene/search/Scorable;)V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=2, locals=6, args_size=2
        start local 0 // org.apache.lucene.search.grouping.AllGroupHeadsCollector$SortingGroupHead this
        start local 1 // org.apache.lucene.search.Scorable scorer
         0: .line 283
            aload 0 /* this */
            getfield org.apache.lucene.search.grouping.AllGroupHeadsCollector$SortingGroupHead.leafComparators:[Lorg/apache/lucene/search/LeafFieldComparator;
            dup
            astore 5
            arraylength
            istore 4
            iconst_0
            istore 3
            goto 4
      StackMap locals: org.apache.lucene.search.grouping.AllGroupHeadsCollector$SortingGroupHead org.apache.lucene.search.Scorable top int int org.apache.lucene.search.LeafFieldComparator[]
      StackMap stack:
         1: aload 5
            iload 3
            aaload
            astore 2 /* c */
        start local 2 // org.apache.lucene.search.LeafFieldComparator c
         2: .line 284
            aload 2 /* c */
            aload 1 /* scorer */
            invokeinterface org.apache.lucene.search.LeafFieldComparator.setScorer:(Lorg/apache/lucene/search/Scorable;)V
        end local 2 // org.apache.lucene.search.LeafFieldComparator c
         3: .line 283
            iinc 3 1
      StackMap locals:
      StackMap stack:
         4: iload 3
            iload 4
            if_icmplt 1
         5: .line 286
            return
        end local 1 // org.apache.lucene.search.Scorable scorer
        end local 0 // org.apache.lucene.search.grouping.AllGroupHeadsCollector$SortingGroupHead this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    6     0    this  Lorg/apache/lucene/search/grouping/AllGroupHeadsCollector$SortingGroupHead<TT;>;
            0    6     1  scorer  Lorg/apache/lucene/search/Scorable;
            2    3     2       c  Lorg/apache/lucene/search/LeafFieldComparator;
    Exceptions:
      throws java.io.IOException
    MethodParameters:
        Name  Flags
      scorer  

  public int compare(int, int);
    descriptor: (II)I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // org.apache.lucene.search.grouping.AllGroupHeadsCollector$SortingGroupHead this
        start local 1 // int compIDX
        start local 2 // int doc
         0: .line 290
            aload 0 /* this */
            getfield org.apache.lucene.search.grouping.AllGroupHeadsCollector$SortingGroupHead.leafComparators:[Lorg/apache/lucene/search/LeafFieldComparator;
            iload 1 /* compIDX */
            aaload
            iload 2 /* doc */
            invokeinterface org.apache.lucene.search.LeafFieldComparator.compareBottom:(I)I
            ireturn
        end local 2 // int doc
        end local 1 // int compIDX
        end local 0 // org.apache.lucene.search.grouping.AllGroupHeadsCollector$SortingGroupHead this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    1     0     this  Lorg/apache/lucene/search/grouping/AllGroupHeadsCollector$SortingGroupHead<TT;>;
            0    1     1  compIDX  I
            0    1     2      doc  I
    Exceptions:
      throws java.io.IOException
    MethodParameters:
         Name  Flags
      compIDX  
      doc      

  public void updateDocHead(int);
    descriptor: (I)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=6, args_size=2
        start local 0 // org.apache.lucene.search.grouping.AllGroupHeadsCollector$SortingGroupHead this
        start local 1 // int doc
         0: .line 295
            aload 0 /* this */
            getfield org.apache.lucene.search.grouping.AllGroupHeadsCollector$SortingGroupHead.leafComparators:[Lorg/apache/lucene/search/LeafFieldComparator;
            dup
            astore 5
            arraylength
            istore 4
            iconst_0
            istore 3
            goto 5
      StackMap locals: org.apache.lucene.search.grouping.AllGroupHeadsCollector$SortingGroupHead int top int int org.apache.lucene.search.LeafFieldComparator[]
      StackMap stack:
         1: aload 5
            iload 3
            aaload
            astore 2 /* comparator */
        start local 2 // org.apache.lucene.search.LeafFieldComparator comparator
         2: .line 296
            aload 2 /* comparator */
            iconst_0
            iload 1 /* doc */
            invokeinterface org.apache.lucene.search.LeafFieldComparator.copy:(II)V
         3: .line 297
            aload 2 /* comparator */
            iconst_0
            invokeinterface org.apache.lucene.search.LeafFieldComparator.setBottom:(I)V
        end local 2 // org.apache.lucene.search.LeafFieldComparator comparator
         4: .line 295
            iinc 3 1
      StackMap locals:
      StackMap stack:
         5: iload 3
            iload 4
            if_icmplt 1
         6: .line 299
            aload 0 /* this */
            iload 1 /* doc */
            aload 0 /* this */
            getfield org.apache.lucene.search.grouping.AllGroupHeadsCollector$SortingGroupHead.docBase:I
            iadd
            putfield org.apache.lucene.search.grouping.AllGroupHeadsCollector$SortingGroupHead.doc:I
         7: .line 300
            return
        end local 1 // int doc
        end local 0 // org.apache.lucene.search.grouping.AllGroupHeadsCollector$SortingGroupHead this
      LocalVariableTable:
        Start  End  Slot        Name  Signature
            0    8     0        this  Lorg/apache/lucene/search/grouping/AllGroupHeadsCollector$SortingGroupHead<TT;>;
            0    8     1         doc  I
            2    4     2  comparator  Lorg/apache/lucene/search/LeafFieldComparator;
    Exceptions:
      throws java.io.IOException
    MethodParameters:
      Name  Flags
      doc   
}
Signature: <T:Ljava/lang/Object;>Lorg/apache/lucene/search/grouping/AllGroupHeadsCollector$GroupHead<TT;>;
SourceFile: "AllGroupHeadsCollector.java"
NestHost: org.apache.lucene.search.grouping.AllGroupHeadsCollector
InnerClasses:
  public abstract GroupHead = org.apache.lucene.search.grouping.AllGroupHeadsCollector$GroupHead of org.apache.lucene.search.grouping.AllGroupHeadsCollector
  private SortingGroupHead = org.apache.lucene.search.grouping.AllGroupHeadsCollector$SortingGroupHead of org.apache.lucene.search.grouping.AllGroupHeadsCollector