https://github.com/google/guava/guava: Guava is a suite of core and expanded libraries that include utility classes, google's collections, io classes, and much much more. 
final class com.google.common.io.ByteSource$SlicedByteSource extends com.google.common.io.ByteSource
  minor version: 0
  major version: 59
  flags: flags: (0x0030) ACC_FINAL, ACC_SUPER
  this_class: com.google.common.io.ByteSource$SlicedByteSource
  super_class: com.google.common.io.ByteSource
{
  final long offset;
    descriptor: J
    flags: (0x0010) ACC_FINAL

  final long length;
    descriptor: J
    flags: (0x0010) ACC_FINAL

  final com.google.common.io.ByteSource this$0;
    descriptor: Lcom/google/common/io/ByteSource;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

  void <init>(com.google.common.io.ByteSource, long, long);
    descriptor: (Lcom/google/common/io/ByteSource;JJ)V
    flags: (0x0000) 
    Code:
      stack=4, locals=6, args_size=4
        start local 0 // com.google.common.io.ByteSource$SlicedByteSource this
        start local 2 // long offset
        start local 4 // long length
         0: .line 487
            aload 0 /* this */
            aload 1
            putfield com.google.common.io.ByteSource$SlicedByteSource.this$0:Lcom/google/common/io/ByteSource;
            aload 0 /* this */
            invokespecial com.google.common.io.ByteSource.<init>:()V
         1: .line 488
            lload 2 /* offset */
            lconst_0
            lcmp
            iflt 2
            iconst_1
            goto 3
      StackMap locals: com.google.common.io.ByteSource$SlicedByteSource com.google.common.io.ByteSource long long
      StackMap stack:
         2: iconst_0
      StackMap locals:
      StackMap stack: int
         3: ldc "offset (%s) may not be negative"
            lload 2 /* offset */
            invokestatic com.google.common.base.Preconditions.checkArgument:(ZLjava/lang/String;J)V
         4: .line 489
            lload 4 /* length */
            lconst_0
            lcmp
            iflt 5
            iconst_1
            goto 6
      StackMap locals:
      StackMap stack:
         5: iconst_0
      StackMap locals:
      StackMap stack: int
         6: ldc "length (%s) may not be negative"
            lload 4 /* length */
            invokestatic com.google.common.base.Preconditions.checkArgument:(ZLjava/lang/String;J)V
         7: .line 490
            aload 0 /* this */
            lload 2 /* offset */
            putfield com.google.common.io.ByteSource$SlicedByteSource.offset:J
         8: .line 491
            aload 0 /* this */
            lload 4 /* length */
            putfield com.google.common.io.ByteSource$SlicedByteSource.length:J
         9: .line 492
            return
        end local 4 // long length
        end local 2 // long offset
        end local 0 // com.google.common.io.ByteSource$SlicedByteSource this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0   10     0    this  Lcom/google/common/io/ByteSource$SlicedByteSource;
            0   10     2  offset  J
            0   10     4  length  J
    MethodParameters:
        Name  Flags
      this$0  final
      offset  
      length  

  public java.io.InputStream openStream();
    descriptor: ()Ljava/io/InputStream;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // com.google.common.io.ByteSource$SlicedByteSource this
         0: .line 496
            aload 0 /* this */
            aload 0 /* this */
            getfield com.google.common.io.ByteSource$SlicedByteSource.this$0:Lcom/google/common/io/ByteSource;
            invokevirtual com.google.common.io.ByteSource.openStream:()Ljava/io/InputStream;
            invokevirtual com.google.common.io.ByteSource$SlicedByteSource.sliceStream:(Ljava/io/InputStream;)Ljava/io/InputStream;
            areturn
        end local 0 // com.google.common.io.ByteSource$SlicedByteSource this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/io/ByteSource$SlicedByteSource;
    Exceptions:
      throws java.io.IOException

  public java.io.InputStream openBufferedStream();
    descriptor: ()Ljava/io/InputStream;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // com.google.common.io.ByteSource$SlicedByteSource this
         0: .line 501
            aload 0 /* this */
            aload 0 /* this */
            getfield com.google.common.io.ByteSource$SlicedByteSource.this$0:Lcom/google/common/io/ByteSource;
            invokevirtual com.google.common.io.ByteSource.openBufferedStream:()Ljava/io/InputStream;
            invokevirtual com.google.common.io.ByteSource$SlicedByteSource.sliceStream:(Ljava/io/InputStream;)Ljava/io/InputStream;
            areturn
        end local 0 // com.google.common.io.ByteSource$SlicedByteSource this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/io/ByteSource$SlicedByteSource;
    Exceptions:
      throws java.io.IOException

  private java.io.InputStream sliceStream(java.io.InputStream);
    descriptor: (Ljava/io/InputStream;)Ljava/io/InputStream;
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=4, locals=7, args_size=2
        start local 0 // com.google.common.io.ByteSource$SlicedByteSource this
        start local 1 // java.io.InputStream in
         0: .line 505
            aload 0 /* this */
            getfield com.google.common.io.ByteSource$SlicedByteSource.offset:J
            lconst_0
            lcmp
            ifle 13
         1: .line 508
            aload 1 /* in */
            aload 0 /* this */
            getfield com.google.common.io.ByteSource$SlicedByteSource.offset:J
            invokestatic com.google.common.io.ByteStreams.skipUpTo:(Ljava/io/InputStream;J)J
            lstore 2 /* skipped */
        start local 2 // long skipped
         2: .line 509
            goto 10
        end local 2 // long skipped
      StackMap locals:
      StackMap stack: java.lang.Throwable
         3: astore 4 /* e */
        start local 4 // java.lang.Throwable e
         4: .line 510
            invokestatic com.google.common.io.Closer.create:()Lcom/google/common/io/Closer;
            astore 5 /* closer */
        start local 5 // com.google.common.io.Closer closer
         5: .line 511
            aload 5 /* closer */
            aload 1 /* in */
            invokevirtual com.google.common.io.Closer.register:(Ljava/io/Closeable;)Ljava/io/Closeable;
            pop
         6: .line 513
            aload 5 /* closer */
            aload 4 /* e */
            invokevirtual com.google.common.io.Closer.rethrow:(Ljava/lang/Throwable;)Ljava/lang/RuntimeException;
            athrow
         7: .line 514
      StackMap locals: com.google.common.io.ByteSource$SlicedByteSource java.io.InputStream top top java.lang.Throwable com.google.common.io.Closer
      StackMap stack: java.lang.Throwable
            astore 6
         8: .line 515
            aload 5 /* closer */
            invokevirtual com.google.common.io.Closer.close:()V
         9: .line 516
            aload 6
            athrow
        end local 5 // com.google.common.io.Closer closer
        end local 4 // java.lang.Throwable e
        start local 2 // long skipped
        10: .line 519
      StackMap locals: com.google.common.io.ByteSource$SlicedByteSource java.io.InputStream long
      StackMap stack:
            lload 2 /* skipped */
            aload 0 /* this */
            getfield com.google.common.io.ByteSource$SlicedByteSource.offset:J
            lcmp
            ifge 13
        11: .line 521
            aload 1 /* in */
            invokevirtual java.io.InputStream.close:()V
        12: .line 522
            new java.io.ByteArrayInputStream
            dup
            iconst_0
            newarray 8
            invokespecial java.io.ByteArrayInputStream.<init>:([B)V
            areturn
        end local 2 // long skipped
        13: .line 525
      StackMap locals:
      StackMap stack:
            aload 1 /* in */
            aload 0 /* this */
            getfield com.google.common.io.ByteSource$SlicedByteSource.length:J
            invokestatic com.google.common.io.ByteStreams.limit:(Ljava/io/InputStream;J)Ljava/io/InputStream;
            areturn
        end local 1 // java.io.InputStream in
        end local 0 // com.google.common.io.ByteSource$SlicedByteSource this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0   14     0     this  Lcom/google/common/io/ByteSource$SlicedByteSource;
            0   14     1       in  Ljava/io/InputStream;
            2    3     2  skipped  J
           10   13     2  skipped  J
            4   10     4        e  Ljava/lang/Throwable;
            5   10     5   closer  Lcom/google/common/io/Closer;
      Exception table:
        from    to  target  type
           1     2       3  Class java.lang.Throwable
           6     7       7  any
    Exceptions:
      throws java.io.IOException
    MethodParameters:
      Name  Flags
      in    

  public com.google.common.io.ByteSource slice(long, long);
    descriptor: (JJ)Lcom/google/common/io/ByteSource;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=7, locals=7, args_size=3
        start local 0 // com.google.common.io.ByteSource$SlicedByteSource this
        start local 1 // long offset
        start local 3 // long length
         0: .line 530
            lload 1 /* offset */
            lconst_0
            lcmp
            iflt 1
            iconst_1
            goto 2
      StackMap locals:
      StackMap stack:
         1: iconst_0
      StackMap locals:
      StackMap stack: int
         2: ldc "offset (%s) may not be negative"
            lload 1 /* offset */
            invokestatic com.google.common.base.Preconditions.checkArgument:(ZLjava/lang/String;J)V
         3: .line 531
            lload 3 /* length */
            lconst_0
            lcmp
            iflt 4
            iconst_1
            goto 5
      StackMap locals:
      StackMap stack:
         4: iconst_0
      StackMap locals:
      StackMap stack: int
         5: ldc "length (%s) may not be negative"
            lload 3 /* length */
            invokestatic com.google.common.base.Preconditions.checkArgument:(ZLjava/lang/String;J)V
         6: .line 532
            aload 0 /* this */
            getfield com.google.common.io.ByteSource$SlicedByteSource.length:J
            lload 1 /* offset */
            lsub
            lstore 5 /* maxLength */
        start local 5 // long maxLength
         7: .line 533
            lload 5 /* maxLength */
            lconst_0
            lcmp
            ifgt 9
         8: .line 534
            invokestatic com.google.common.io.ByteSource.empty:()Lcom/google/common/io/ByteSource;
            goto 10
         9: .line 535
      StackMap locals: long
      StackMap stack:
            aload 0 /* this */
            getfield com.google.common.io.ByteSource$SlicedByteSource.this$0:Lcom/google/common/io/ByteSource;
            aload 0 /* this */
            getfield com.google.common.io.ByteSource$SlicedByteSource.offset:J
            lload 1 /* offset */
            ladd
            lload 3 /* length */
            lload 5 /* maxLength */
            invokestatic java.lang.Math.min:(JJ)J
            invokevirtual com.google.common.io.ByteSource.slice:(JJ)Lcom/google/common/io/ByteSource;
        10: .line 533
      StackMap locals:
      StackMap stack: com.google.common.io.ByteSource
            areturn
        end local 5 // long maxLength
        end local 3 // long length
        end local 1 // long offset
        end local 0 // com.google.common.io.ByteSource$SlicedByteSource this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0   11     0       this  Lcom/google/common/io/ByteSource$SlicedByteSource;
            0   11     1     offset  J
            0   11     3     length  J
            7   11     5  maxLength  J
    MethodParameters:
        Name  Flags
      offset  
      length  

  public boolean isEmpty();
    descriptor: ()Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=1, args_size=1
        start local 0 // com.google.common.io.ByteSource$SlicedByteSource this
         0: .line 540
            aload 0 /* this */
            getfield com.google.common.io.ByteSource$SlicedByteSource.length:J
            lconst_0
            lcmp
            ifeq 1
            aload 0 /* this */
            invokespecial com.google.common.io.ByteSource.isEmpty:()Z
            ifne 1
            iconst_0
            ireturn
      StackMap locals:
      StackMap stack:
         1: iconst_1
            ireturn
        end local 0 // com.google.common.io.ByteSource$SlicedByteSource this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lcom/google/common/io/ByteSource$SlicedByteSource;
    Exceptions:
      throws java.io.IOException

  public com.google.common.base.Optional<java.lang.Long> sizeIfKnown();
    descriptor: ()Lcom/google/common/base/Optional;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=6, locals=6, args_size=1
        start local 0 // com.google.common.io.ByteSource$SlicedByteSource this
         0: .line 545
            aload 0 /* this */
            getfield com.google.common.io.ByteSource$SlicedByteSource.this$0:Lcom/google/common/io/ByteSource;
            invokevirtual com.google.common.io.ByteSource.sizeIfKnown:()Lcom/google/common/base/Optional;
            astore 1 /* optionalUnslicedSize */
        start local 1 // com.google.common.base.Optional optionalUnslicedSize
         1: .line 546
            aload 1 /* optionalUnslicedSize */
            invokevirtual com.google.common.base.Optional.isPresent:()Z
            ifeq 5
         2: .line 547
            aload 1 /* optionalUnslicedSize */
            invokevirtual com.google.common.base.Optional.get:()Ljava/lang/Object;
            checkcast java.lang.Long
            invokevirtual java.lang.Long.longValue:()J
            lstore 2 /* unslicedSize */
        start local 2 // long unslicedSize
         3: .line 548
            aload 0 /* this */
            getfield com.google.common.io.ByteSource$SlicedByteSource.offset:J
            lload 2 /* unslicedSize */
            invokestatic java.lang.Math.min:(JJ)J
            lstore 4 /* off */
        start local 4 // long off
         4: .line 549
            aload 0 /* this */
            getfield com.google.common.io.ByteSource$SlicedByteSource.length:J
            lload 2 /* unslicedSize */
            lload 4 /* off */
            lsub
            invokestatic java.lang.Math.min:(JJ)J
            invokestatic java.lang.Long.valueOf:(J)Ljava/lang/Long;
            invokestatic com.google.common.base.Optional.of:(Ljava/lang/Object;)Lcom/google/common/base/Optional;
            areturn
        end local 4 // long off
        end local 2 // long unslicedSize
         5: .line 551
      StackMap locals: com.google.common.base.Optional
      StackMap stack:
            invokestatic com.google.common.base.Optional.absent:()Lcom/google/common/base/Optional;
            areturn
        end local 1 // com.google.common.base.Optional optionalUnslicedSize
        end local 0 // com.google.common.io.ByteSource$SlicedByteSource this
      LocalVariableTable:
        Start  End  Slot                  Name  Signature
            0    6     0                  this  Lcom/google/common/io/ByteSource$SlicedByteSource;
            1    6     1  optionalUnslicedSize  Lcom/google/common/base/Optional<Ljava/lang/Long;>;
            3    5     2          unslicedSize  J
            4    5     4                   off  J
    Signature: ()Lcom/google/common/base/Optional<Ljava/lang/Long;>;

  public java.lang.String toString();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // com.google.common.io.ByteSource$SlicedByteSource this
         0: .line 556
            new java.lang.StringBuilder
            dup
            aload 0 /* this */
            getfield com.google.common.io.ByteSource$SlicedByteSource.this$0:Lcom/google/common/io/ByteSource;
            invokevirtual java.lang.Object.toString:()Ljava/lang/String;
            invokestatic java.lang.String.valueOf:(Ljava/lang/Object;)Ljava/lang/String;
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            ldc ".slice("
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            aload 0 /* this */
            getfield com.google.common.io.ByteSource$SlicedByteSource.offset:J
            invokevirtual java.lang.StringBuilder.append:(J)Ljava/lang/StringBuilder;
            ldc ", "
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            aload 0 /* this */
            getfield com.google.common.io.ByteSource$SlicedByteSource.length:J
            invokevirtual java.lang.StringBuilder.append:(J)Ljava/lang/StringBuilder;
            ldc ")"
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            areturn
        end local 0 // com.google.common.io.ByteSource$SlicedByteSource this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/io/ByteSource$SlicedByteSource;
}
SourceFile: "ByteSource.java"
NestHost: com.google.common.io.ByteSource
InnerClasses:
  private final SlicedByteSource = com.google.common.io.ByteSource$SlicedByteSource of com.google.common.io.ByteSource