https://lucene.apache.org/lucene-parent/lucene-core: Apache Lucene Java Core (The Apache Software Foundation) 
public class org.apache.lucene.util.BitSetIterator extends org.apache.lucene.search.DocIdSetIterator
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.apache.lucene.util.BitSetIterator
  super_class: org.apache.lucene.search.DocIdSetIterator
{
  private final org.apache.lucene.util.BitSet bits;
    descriptor: Lorg/apache/lucene/util/BitSet;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private final int length;
    descriptor: I
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private final long cost;
    descriptor: J
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private int doc;
    descriptor: I
    flags: (0x0002) ACC_PRIVATE

  static final boolean $assertionsDisabled;
    descriptor: Z
    flags: (0x1018) ACC_STATIC, ACC_FINAL, ACC_SYNTHETIC

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=1, locals=0, args_size=0
         0: .line 27
            ldc Lorg/apache/lucene/util/BitSetIterator;
            invokevirtual java.lang.Class.desiredAssertionStatus:()Z
            ifne 1
            iconst_1
            goto 2
      StackMap locals:
      StackMap stack:
         1: iconst_0
      StackMap locals:
      StackMap stack: int
         2: putstatic org.apache.lucene.util.BitSetIterator.$assertionsDisabled:Z
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  private static <T extends org.apache.lucene.util.BitSet> T getBitSet(org.apache.lucene.search.DocIdSetIterator, java.lang.Class<? extends T>);
    descriptor: (Lorg/apache/lucene/search/DocIdSetIterator;Ljava/lang/Class;)Lorg/apache/lucene/util/BitSet;
    flags: (0x000a) ACC_PRIVATE, ACC_STATIC
    Code:
      stack=2, locals=3, args_size=2
        start local 0 // org.apache.lucene.search.DocIdSetIterator iterator
        start local 1 // java.lang.Class clazz
         0: .line 30
            aload 0 /* iterator */
            instanceof org.apache.lucene.util.BitSetIterator
            ifeq 5
         1: .line 31
            aload 0 /* iterator */
            checkcast org.apache.lucene.util.BitSetIterator
            getfield org.apache.lucene.util.BitSetIterator.bits:Lorg/apache/lucene/util/BitSet;
            astore 2 /* bits */
        start local 2 // org.apache.lucene.util.BitSet bits
         2: .line 32
            getstatic org.apache.lucene.util.BitSetIterator.$assertionsDisabled:Z
            ifne 3
            aload 2 /* bits */
            ifnonnull 3
            new java.lang.AssertionError
            dup
            invokespecial java.lang.AssertionError.<init>:()V
            athrow
         3: .line 33
      StackMap locals: org.apache.lucene.util.BitSet
      StackMap stack:
            aload 1 /* clazz */
            aload 2 /* bits */
            invokevirtual java.lang.Class.isInstance:(Ljava/lang/Object;)Z
            ifeq 5
         4: .line 34
            aload 1 /* clazz */
            aload 2 /* bits */
            invokevirtual java.lang.Class.cast:(Ljava/lang/Object;)Ljava/lang/Object;
            checkcast org.apache.lucene.util.BitSet
            areturn
        end local 2 // org.apache.lucene.util.BitSet bits
         5: .line 37
      StackMap locals:
      StackMap stack:
            aconst_null
            areturn
        end local 1 // java.lang.Class clazz
        end local 0 // org.apache.lucene.search.DocIdSetIterator iterator
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    6     0  iterator  Lorg/apache/lucene/search/DocIdSetIterator;
            0    6     1     clazz  Ljava/lang/Class<+TT;>;
            2    5     2      bits  Lorg/apache/lucene/util/BitSet;
    Signature: <T:Lorg/apache/lucene/util/BitSet;>(Lorg/apache/lucene/search/DocIdSetIterator;Ljava/lang/Class<+TT;>;)TT;
    MethodParameters:
          Name  Flags
      iterator  
      clazz     

  public static org.apache.lucene.util.FixedBitSet getFixedBitSetOrNull(org.apache.lucene.search.DocIdSetIterator);
    descriptor: (Lorg/apache/lucene/search/DocIdSetIterator;)Lorg/apache/lucene/util/FixedBitSet;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // org.apache.lucene.search.DocIdSetIterator iterator
         0: .line 42
            aload 0 /* iterator */
            ldc Lorg/apache/lucene/util/FixedBitSet;
            invokestatic org.apache.lucene.util.BitSetIterator.getBitSet:(Lorg/apache/lucene/search/DocIdSetIterator;Ljava/lang/Class;)Lorg/apache/lucene/util/BitSet;
            checkcast org.apache.lucene.util.FixedBitSet
            areturn
        end local 0 // org.apache.lucene.search.DocIdSetIterator iterator
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    1     0  iterator  Lorg/apache/lucene/search/DocIdSetIterator;
    MethodParameters:
          Name  Flags
      iterator  

  public static org.apache.lucene.util.SparseFixedBitSet getSparseFixedBitSetOrNull(org.apache.lucene.search.DocIdSetIterator);
    descriptor: (Lorg/apache/lucene/search/DocIdSetIterator;)Lorg/apache/lucene/util/SparseFixedBitSet;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // org.apache.lucene.search.DocIdSetIterator iterator
         0: .line 47
            aload 0 /* iterator */
            ldc Lorg/apache/lucene/util/SparseFixedBitSet;
            invokestatic org.apache.lucene.util.BitSetIterator.getBitSet:(Lorg/apache/lucene/search/DocIdSetIterator;Ljava/lang/Class;)Lorg/apache/lucene/util/BitSet;
            checkcast org.apache.lucene.util.SparseFixedBitSet
            areturn
        end local 0 // org.apache.lucene.search.DocIdSetIterator iterator
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    1     0  iterator  Lorg/apache/lucene/search/DocIdSetIterator;
    MethodParameters:
          Name  Flags
      iterator  

  public void <init>(org.apache.lucene.util.BitSet, long);
    descriptor: (Lorg/apache/lucene/util/BitSet;J)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=4, args_size=3
        start local 0 // org.apache.lucene.util.BitSetIterator this
        start local 1 // org.apache.lucene.util.BitSet bits
        start local 2 // long cost
         0: .line 56
            aload 0 /* this */
            invokespecial org.apache.lucene.search.DocIdSetIterator.<init>:()V
         1: .line 53
            aload 0 /* this */
            iconst_m1
            putfield org.apache.lucene.util.BitSetIterator.doc:I
         2: .line 57
            lload 2 /* cost */
            lconst_0
            lcmp
            ifge 4
         3: .line 58
            new java.lang.IllegalArgumentException
            dup
            new java.lang.StringBuilder
            dup
            ldc "cost must be >= 0, got "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            lload 2 /* cost */
            invokevirtual java.lang.StringBuilder.append:(J)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;)V
            athrow
         4: .line 60
      StackMap locals: org.apache.lucene.util.BitSetIterator org.apache.lucene.util.BitSet long
      StackMap stack:
            aload 0 /* this */
            aload 1 /* bits */
            putfield org.apache.lucene.util.BitSetIterator.bits:Lorg/apache/lucene/util/BitSet;
         5: .line 61
            aload 0 /* this */
            aload 1 /* bits */
            invokevirtual org.apache.lucene.util.BitSet.length:()I
            putfield org.apache.lucene.util.BitSetIterator.length:I
         6: .line 62
            aload 0 /* this */
            lload 2 /* cost */
            putfield org.apache.lucene.util.BitSetIterator.cost:J
         7: .line 63
            return
        end local 2 // long cost
        end local 1 // org.apache.lucene.util.BitSet bits
        end local 0 // org.apache.lucene.util.BitSetIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    8     0  this  Lorg/apache/lucene/util/BitSetIterator;
            0    8     1  bits  Lorg/apache/lucene/util/BitSet;
            0    8     2  cost  J
    MethodParameters:
      Name  Flags
      bits  
      cost  

  public org.apache.lucene.util.BitSet getBitSet();
    descriptor: ()Lorg/apache/lucene/util/BitSet;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.apache.lucene.util.BitSetIterator this
         0: .line 67
            aload 0 /* this */
            getfield org.apache.lucene.util.BitSetIterator.bits:Lorg/apache/lucene/util/BitSet;
            areturn
        end local 0 // org.apache.lucene.util.BitSetIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/apache/lucene/util/BitSetIterator;

  public int docID();
    descriptor: ()I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.apache.lucene.util.BitSetIterator this
         0: .line 72
            aload 0 /* this */
            getfield org.apache.lucene.util.BitSetIterator.doc:I
            ireturn
        end local 0 // org.apache.lucene.util.BitSetIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/apache/lucene/util/BitSetIterator;

  public void setDocId(int);
    descriptor: (I)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.apache.lucene.util.BitSetIterator this
        start local 1 // int docId
         0: .line 77
            aload 0 /* this */
            iload 1 /* docId */
            putfield org.apache.lucene.util.BitSetIterator.doc:I
         1: .line 78
            return
        end local 1 // int docId
        end local 0 // org.apache.lucene.util.BitSetIterator this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    2     0   this  Lorg/apache/lucene/util/BitSetIterator;
            0    2     1  docId  I
    MethodParameters:
       Name  Flags
      docId  

  public int nextDoc();
    descriptor: ()I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // org.apache.lucene.util.BitSetIterator this
         0: .line 82
            aload 0 /* this */
            aload 0 /* this */
            getfield org.apache.lucene.util.BitSetIterator.doc:I
            iconst_1
            iadd
            invokevirtual org.apache.lucene.util.BitSetIterator.advance:(I)I
            ireturn
        end local 0 // org.apache.lucene.util.BitSetIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/apache/lucene/util/BitSetIterator;

  public int advance(int);
    descriptor: (I)I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // org.apache.lucene.util.BitSetIterator this
        start local 1 // int target
         0: .line 87
            iload 1 /* target */
            aload 0 /* this */
            getfield org.apache.lucene.util.BitSetIterator.length:I
            if_icmplt 2
         1: .line 88
            aload 0 /* this */
            ldc 2147483647
            dup_x1
            putfield org.apache.lucene.util.BitSetIterator.doc:I
            ireturn
         2: .line 90
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            aload 0 /* this */
            getfield org.apache.lucene.util.BitSetIterator.bits:Lorg/apache/lucene/util/BitSet;
            iload 1 /* target */
            invokevirtual org.apache.lucene.util.BitSet.nextSetBit:(I)I
            dup_x1
            putfield org.apache.lucene.util.BitSetIterator.doc:I
            ireturn
        end local 1 // int target
        end local 0 // org.apache.lucene.util.BitSetIterator this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    3     0    this  Lorg/apache/lucene/util/BitSetIterator;
            0    3     1  target  I
    MethodParameters:
        Name  Flags
      target  

  public long cost();
    descriptor: ()J
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // org.apache.lucene.util.BitSetIterator this
         0: .line 95
            aload 0 /* this */
            getfield org.apache.lucene.util.BitSetIterator.cost:J
            lreturn
        end local 0 // org.apache.lucene.util.BitSetIterator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/apache/lucene/util/BitSetIterator;
}
SourceFile: "BitSetIterator.java"