https://lucene.apache.org/lucene-parent/lucene-core: Apache Lucene Java Core (The Apache Software Foundation) 
public abstract class org.apache.lucene.util.packed.PackedInts$Mutable extends org.apache.lucene.util.packed.PackedInts$Reader
  minor version: 0
  major version: 59
  flags: flags: (0x0421) ACC_PUBLIC, ACC_SUPER, ACC_ABSTRACT
  this_class: org.apache.lucene.util.packed.PackedInts$Mutable
  super_class: org.apache.lucene.util.packed.PackedInts$Reader
{
  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 533
            ldc Lorg/apache/lucene/util/packed/PackedInts;
            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.packed.PackedInts$Mutable.$assertionsDisabled:Z
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.apache.lucene.util.packed.PackedInts$Mutable this
         0: .line 533
            aload 0 /* this */
            invokespecial org.apache.lucene.util.packed.PackedInts$Reader.<init>:()V
            return
        end local 0 // org.apache.lucene.util.packed.PackedInts$Mutable this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/apache/lucene/util/packed/PackedInts$Mutable;

  public abstract int getBitsPerValue();
    descriptor: ()I
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public abstract void set(int, long);
    descriptor: (IJ)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
       Name  Flags
      index  
      value  

  public int set(int, long[], int, int);
    descriptor: (I[JII)I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=8, args_size=5
        start local 0 // org.apache.lucene.util.packed.PackedInts$Mutable this
        start local 1 // int index
        start local 2 // long[] arr
        start local 3 // int off
        start local 4 // int len
         0: .line 557
            getstatic org.apache.lucene.util.packed.PackedInts$Mutable.$assertionsDisabled:Z
            ifne 1
            iload 4 /* len */
            ifgt 1
            new java.lang.AssertionError
            dup
            new java.lang.StringBuilder
            dup
            ldc "len must be > 0 (got "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            iload 4 /* len */
            invokevirtual java.lang.StringBuilder.append:(I)Ljava/lang/StringBuilder;
            ldc ")"
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            invokespecial java.lang.AssertionError.<init>:(Ljava/lang/Object;)V
            athrow
         1: .line 558
      StackMap locals:
      StackMap stack:
            getstatic org.apache.lucene.util.packed.PackedInts$Mutable.$assertionsDisabled:Z
            ifne 3
            iload 1 /* index */
            iflt 2
            iload 1 /* index */
            aload 0 /* this */
            invokevirtual org.apache.lucene.util.packed.PackedInts$Mutable.size:()I
            if_icmplt 3
      StackMap locals:
      StackMap stack:
         2: new java.lang.AssertionError
            dup
            invokespecial java.lang.AssertionError.<init>:()V
            athrow
         3: .line 559
      StackMap locals:
      StackMap stack:
            iload 4 /* len */
            aload 0 /* this */
            invokevirtual org.apache.lucene.util.packed.PackedInts$Mutable.size:()I
            iload 1 /* index */
            isub
            invokestatic java.lang.Math.min:(II)I
            istore 4 /* len */
         4: .line 560
            getstatic org.apache.lucene.util.packed.PackedInts$Mutable.$assertionsDisabled:Z
            ifne 5
            iload 3 /* off */
            iload 4 /* len */
            iadd
            aload 2 /* arr */
            arraylength
            if_icmple 5
            new java.lang.AssertionError
            dup
            invokespecial java.lang.AssertionError.<init>:()V
            athrow
         5: .line 562
      StackMap locals:
      StackMap stack:
            iload 1 /* index */
            istore 5 /* i */
        start local 5 // int i
         6: iload 3 /* off */
            istore 6 /* o */
        start local 6 // int o
         7: iload 1 /* index */
            iload 4 /* len */
            iadd
            istore 7 /* end */
        start local 7 // int end
         8: goto 11
         9: .line 563
      StackMap locals: int int int
      StackMap stack:
            aload 0 /* this */
            iload 5 /* i */
            aload 2 /* arr */
            iload 6 /* o */
            laload
            invokevirtual org.apache.lucene.util.packed.PackedInts$Mutable.set:(IJ)V
        10: .line 562
            iinc 5 /* i */ 1
            iinc 6 /* o */ 1
      StackMap locals:
      StackMap stack:
        11: iload 5 /* i */
            iload 7 /* end */
            if_icmplt 9
        end local 7 // int end
        end local 6 // int o
        end local 5 // int i
        12: .line 565
            iload 4 /* len */
            ireturn
        end local 4 // int len
        end local 3 // int off
        end local 2 // long[] arr
        end local 1 // int index
        end local 0 // org.apache.lucene.util.packed.PackedInts$Mutable this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0   13     0   this  Lorg/apache/lucene/util/packed/PackedInts$Mutable;
            0   13     1  index  I
            0   13     2    arr  [J
            0   13     3    off  I
            0   13     4    len  I
            6   12     5      i  I
            7   12     6      o  I
            8   12     7    end  I
    MethodParameters:
       Name  Flags
      index  
      arr    
      off    
      len    

  public void fill(int, int, long);
    descriptor: (IIJ)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=6, args_size=4
        start local 0 // org.apache.lucene.util.packed.PackedInts$Mutable this
        start local 1 // int fromIndex
        start local 2 // int toIndex
        start local 3 // long val
         0: .line 573
            getstatic org.apache.lucene.util.packed.PackedInts$Mutable.$assertionsDisabled:Z
            ifne 1
            lload 3 /* val */
            aload 0 /* this */
            invokevirtual org.apache.lucene.util.packed.PackedInts$Mutable.getBitsPerValue:()I
            invokestatic org.apache.lucene.util.packed.PackedInts.maxValue:(I)J
            lcmp
            ifle 1
            new java.lang.AssertionError
            dup
            invokespecial java.lang.AssertionError.<init>:()V
            athrow
         1: .line 574
      StackMap locals:
      StackMap stack:
            getstatic org.apache.lucene.util.packed.PackedInts$Mutable.$assertionsDisabled:Z
            ifne 2
            iload 1 /* fromIndex */
            iload 2 /* toIndex */
            if_icmple 2
            new java.lang.AssertionError
            dup
            invokespecial java.lang.AssertionError.<init>:()V
            athrow
         2: .line 575
      StackMap locals:
      StackMap stack:
            iload 1 /* fromIndex */
            istore 5 /* i */
        start local 5 // int i
         3: goto 6
         4: .line 576
      StackMap locals: int
      StackMap stack:
            aload 0 /* this */
            iload 5 /* i */
            lload 3 /* val */
            invokevirtual org.apache.lucene.util.packed.PackedInts$Mutable.set:(IJ)V
         5: .line 575
            iinc 5 /* i */ 1
      StackMap locals:
      StackMap stack:
         6: iload 5 /* i */
            iload 2 /* toIndex */
            if_icmplt 4
        end local 5 // int i
         7: .line 578
            return
        end local 3 // long val
        end local 2 // int toIndex
        end local 1 // int fromIndex
        end local 0 // org.apache.lucene.util.packed.PackedInts$Mutable this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0    8     0       this  Lorg/apache/lucene/util/packed/PackedInts$Mutable;
            0    8     1  fromIndex  I
            0    8     2    toIndex  I
            0    8     3        val  J
            3    7     5          i  I
    MethodParameters:
           Name  Flags
      fromIndex  
      toIndex    
      val        

  public void clear();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=1, args_size=1
        start local 0 // org.apache.lucene.util.packed.PackedInts$Mutable this
         0: .line 584
            aload 0 /* this */
            iconst_0
            aload 0 /* this */
            invokevirtual org.apache.lucene.util.packed.PackedInts$Mutable.size:()I
            lconst_0
            invokevirtual org.apache.lucene.util.packed.PackedInts$Mutable.fill:(IIJ)V
         1: .line 585
            return
        end local 0 // org.apache.lucene.util.packed.PackedInts$Mutable this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lorg/apache/lucene/util/packed/PackedInts$Mutable;

  public void save(org.apache.lucene.store.DataOutput);
    descriptor: (Lorg/apache/lucene/store/DataOutput;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=4, args_size=2
        start local 0 // org.apache.lucene.util.packed.PackedInts$Mutable this
        start local 1 // org.apache.lucene.store.DataOutput out
         0: .line 593
            aload 1 /* out */
            aload 0 /* this */
            invokevirtual org.apache.lucene.util.packed.PackedInts$Mutable.getFormat:()Lorg/apache/lucene/util/packed/PackedInts$Format;
            aload 0 /* this */
            invokevirtual org.apache.lucene.util.packed.PackedInts$Mutable.size:()I
            aload 0 /* this */
            invokevirtual org.apache.lucene.util.packed.PackedInts$Mutable.getBitsPerValue:()I
            sipush 1024
            invokestatic org.apache.lucene.util.packed.PackedInts.getWriterNoHeader:(Lorg/apache/lucene/store/DataOutput;Lorg/apache/lucene/util/packed/PackedInts$Format;III)Lorg/apache/lucene/util/packed/PackedInts$Writer;
            astore 2 /* writer */
        start local 2 // org.apache.lucene.util.packed.PackedInts$Writer writer
         1: .line 594
            aload 2 /* writer */
            invokevirtual org.apache.lucene.util.packed.PackedInts$Writer.writeHeader:()V
         2: .line 595
            iconst_0
            istore 3 /* i */
        start local 3 // int i
         3: goto 6
         4: .line 596
      StackMap locals: org.apache.lucene.util.packed.PackedInts$Writer int
      StackMap stack:
            aload 2 /* writer */
            aload 0 /* this */
            iload 3 /* i */
            invokevirtual org.apache.lucene.util.packed.PackedInts$Mutable.get:(I)J
            invokevirtual org.apache.lucene.util.packed.PackedInts$Writer.add:(J)V
         5: .line 595
            iinc 3 /* i */ 1
      StackMap locals:
      StackMap stack:
         6: iload 3 /* i */
            aload 0 /* this */
            invokevirtual org.apache.lucene.util.packed.PackedInts$Mutable.size:()I
            if_icmplt 4
        end local 3 // int i
         7: .line 598
            aload 2 /* writer */
            invokevirtual org.apache.lucene.util.packed.PackedInts$Writer.finish:()V
         8: .line 599
            return
        end local 2 // org.apache.lucene.util.packed.PackedInts$Writer writer
        end local 1 // org.apache.lucene.store.DataOutput out
        end local 0 // org.apache.lucene.util.packed.PackedInts$Mutable this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    9     0    this  Lorg/apache/lucene/util/packed/PackedInts$Mutable;
            0    9     1     out  Lorg/apache/lucene/store/DataOutput;
            1    9     2  writer  Lorg/apache/lucene/util/packed/PackedInts$Writer;
            3    7     3       i  I
    Exceptions:
      throws java.io.IOException
    MethodParameters:
      Name  Flags
      out   

  org.apache.lucene.util.packed.PackedInts$Format getFormat();
    descriptor: ()Lorg/apache/lucene/util/packed/PackedInts$Format;
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.apache.lucene.util.packed.PackedInts$Mutable this
         0: .line 603
            getstatic org.apache.lucene.util.packed.PackedInts$Format.PACKED:Lorg/apache/lucene/util/packed/PackedInts$Format;
            areturn
        end local 0 // org.apache.lucene.util.packed.PackedInts$Mutable this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/apache/lucene/util/packed/PackedInts$Mutable;
}
SourceFile: "PackedInts.java"
NestHost: org.apache.lucene.util.packed.PackedInts
InnerClasses:
  public Format = org.apache.lucene.util.packed.PackedInts$Format of org.apache.lucene.util.packed.PackedInts
  public abstract Mutable = org.apache.lucene.util.packed.PackedInts$Mutable of org.apache.lucene.util.packed.PackedInts
  public abstract Reader = org.apache.lucene.util.packed.PackedInts$Reader of org.apache.lucene.util.packed.PackedInts
  public abstract Writer = org.apache.lucene.util.packed.PackedInts$Writer of org.apache.lucene.util.packed.PackedInts