http://netty.io/netty-all/: Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers and clients. (The Netty Project) 
public final class io.netty.handler.codec.compression.ZlibCodecFactory
  minor version: 0
  major version: 59
  flags: flags: (0x0031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER
  this_class: io.netty.handler.codec.compression.ZlibCodecFactory
  super_class: java.lang.Object
{
  private static final io.netty.util.internal.logging.InternalLogger logger;
    descriptor: Lio/netty/util/internal/logging/InternalLogger;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL

  private static final int DEFAULT_JDK_WINDOW_SIZE;
    descriptor: I
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: 15

  private static final int DEFAULT_JDK_MEM_LEVEL;
    descriptor: I
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: 8

  private static final boolean noJdkZlibDecoder;
    descriptor: Z
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL

  private static final boolean noJdkZlibEncoder;
    descriptor: Z
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL

  private static final boolean supportsWindowSizeAndMemLevel;
    descriptor: Z
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=3, locals=0, args_size=0
         0: .line 27
            ldc Lio/netty/handler/codec/compression/ZlibCodecFactory;
            invokestatic io.netty.util.internal.logging.InternalLoggerFactory.getInstance:(Ljava/lang/Class;)Lio/netty/util/internal/logging/InternalLogger;
            putstatic io.netty.handler.codec.compression.ZlibCodecFactory.logger:Lio/netty/util/internal/logging/InternalLogger;
         1: .line 37
            ldc "io.netty.noJdkZlibDecoder"
         2: .line 38
            invokestatic io.netty.util.internal.PlatformDependent.javaVersion:()I
            bipush 7
            if_icmpge 3
            iconst_1
            goto 4
      StackMap locals:
      StackMap stack: java.lang.String
         3: iconst_0
         4: .line 37
      StackMap locals:
      StackMap stack: java.lang.String int
            invokestatic io.netty.util.internal.SystemPropertyUtil.getBoolean:(Ljava/lang/String;Z)Z
            putstatic io.netty.handler.codec.compression.ZlibCodecFactory.noJdkZlibDecoder:Z
         5: .line 39
            getstatic io.netty.handler.codec.compression.ZlibCodecFactory.logger:Lio/netty/util/internal/logging/InternalLogger;
            ldc "-Dio.netty.noJdkZlibDecoder: {}"
            getstatic io.netty.handler.codec.compression.ZlibCodecFactory.noJdkZlibDecoder:Z
            invokestatic java.lang.Boolean.valueOf:(Z)Ljava/lang/Boolean;
            invokeinterface io.netty.util.internal.logging.InternalLogger.debug:(Ljava/lang/String;Ljava/lang/Object;)V
         6: .line 41
            ldc "io.netty.noJdkZlibEncoder"
            iconst_0
            invokestatic io.netty.util.internal.SystemPropertyUtil.getBoolean:(Ljava/lang/String;Z)Z
            putstatic io.netty.handler.codec.compression.ZlibCodecFactory.noJdkZlibEncoder:Z
         7: .line 42
            getstatic io.netty.handler.codec.compression.ZlibCodecFactory.logger:Lio/netty/util/internal/logging/InternalLogger;
            ldc "-Dio.netty.noJdkZlibEncoder: {}"
            getstatic io.netty.handler.codec.compression.ZlibCodecFactory.noJdkZlibEncoder:Z
            invokestatic java.lang.Boolean.valueOf:(Z)Ljava/lang/Boolean;
            invokeinterface io.netty.util.internal.logging.InternalLogger.debug:(Ljava/lang/String;Ljava/lang/Object;)V
         8: .line 44
            getstatic io.netty.handler.codec.compression.ZlibCodecFactory.noJdkZlibDecoder:Z
            ifne 9
            invokestatic io.netty.util.internal.PlatformDependent.javaVersion:()I
            bipush 7
            if_icmpge 9
            iconst_0
            goto 10
      StackMap locals:
      StackMap stack:
         9: iconst_1
      StackMap locals:
      StackMap stack: int
        10: putstatic io.netty.handler.codec.compression.ZlibCodecFactory.supportsWindowSizeAndMemLevel:Z
        11: .line 45
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public static boolean isSupportingWindowSizeAndMemLevel();
    descriptor: ()Z
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=1, locals=0, args_size=0
         0: .line 51
            getstatic io.netty.handler.codec.compression.ZlibCodecFactory.supportsWindowSizeAndMemLevel:Z
            ireturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public static io.netty.handler.codec.compression.ZlibEncoder newZlibEncoder(int);
    descriptor: (I)Lio/netty/handler/codec/compression/ZlibEncoder;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // int compressionLevel
         0: .line 55
            invokestatic io.netty.util.internal.PlatformDependent.javaVersion:()I
            bipush 7
            if_icmplt 1
            getstatic io.netty.handler.codec.compression.ZlibCodecFactory.noJdkZlibEncoder:Z
            ifeq 2
         1: .line 56
      StackMap locals:
      StackMap stack:
            new io.netty.handler.codec.compression.JZlibEncoder
            dup
            iload 0 /* compressionLevel */
            invokespecial io.netty.handler.codec.compression.JZlibEncoder.<init>:(I)V
            areturn
         2: .line 58
      StackMap locals:
      StackMap stack:
            new io.netty.handler.codec.compression.JdkZlibEncoder
            dup
            iload 0 /* compressionLevel */
            invokespecial io.netty.handler.codec.compression.JdkZlibEncoder.<init>:(I)V
            areturn
        end local 0 // int compressionLevel
      LocalVariableTable:
        Start  End  Slot              Name  Signature
            0    3     0  compressionLevel  I
    MethodParameters:
                  Name  Flags
      compressionLevel  

  public static io.netty.handler.codec.compression.ZlibEncoder newZlibEncoder(io.netty.handler.codec.compression.ZlibWrapper);
    descriptor: (Lio/netty/handler/codec/compression/ZlibWrapper;)Lio/netty/handler/codec/compression/ZlibEncoder;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // io.netty.handler.codec.compression.ZlibWrapper wrapper
         0: .line 63
            invokestatic io.netty.util.internal.PlatformDependent.javaVersion:()I
            bipush 7
            if_icmplt 1
            getstatic io.netty.handler.codec.compression.ZlibCodecFactory.noJdkZlibEncoder:Z
            ifeq 2
         1: .line 64
      StackMap locals:
      StackMap stack:
            new io.netty.handler.codec.compression.JZlibEncoder
            dup
            aload 0 /* wrapper */
            invokespecial io.netty.handler.codec.compression.JZlibEncoder.<init>:(Lio/netty/handler/codec/compression/ZlibWrapper;)V
            areturn
         2: .line 66
      StackMap locals:
      StackMap stack:
            new io.netty.handler.codec.compression.JdkZlibEncoder
            dup
            aload 0 /* wrapper */
            invokespecial io.netty.handler.codec.compression.JdkZlibEncoder.<init>:(Lio/netty/handler/codec/compression/ZlibWrapper;)V
            areturn
        end local 0 // io.netty.handler.codec.compression.ZlibWrapper wrapper
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    3     0  wrapper  Lio/netty/handler/codec/compression/ZlibWrapper;
    MethodParameters:
         Name  Flags
      wrapper  

  public static io.netty.handler.codec.compression.ZlibEncoder newZlibEncoder(io.netty.handler.codec.compression.ZlibWrapper, int);
    descriptor: (Lio/netty/handler/codec/compression/ZlibWrapper;I)Lio/netty/handler/codec/compression/ZlibEncoder;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=4, locals=2, args_size=2
        start local 0 // io.netty.handler.codec.compression.ZlibWrapper wrapper
        start local 1 // int compressionLevel
         0: .line 71
            invokestatic io.netty.util.internal.PlatformDependent.javaVersion:()I
            bipush 7
            if_icmplt 1
            getstatic io.netty.handler.codec.compression.ZlibCodecFactory.noJdkZlibEncoder:Z
            ifeq 2
         1: .line 72
      StackMap locals:
      StackMap stack:
            new io.netty.handler.codec.compression.JZlibEncoder
            dup
            aload 0 /* wrapper */
            iload 1 /* compressionLevel */
            invokespecial io.netty.handler.codec.compression.JZlibEncoder.<init>:(Lio/netty/handler/codec/compression/ZlibWrapper;I)V
            areturn
         2: .line 74
      StackMap locals:
      StackMap stack:
            new io.netty.handler.codec.compression.JdkZlibEncoder
            dup
            aload 0 /* wrapper */
            iload 1 /* compressionLevel */
            invokespecial io.netty.handler.codec.compression.JdkZlibEncoder.<init>:(Lio/netty/handler/codec/compression/ZlibWrapper;I)V
            areturn
        end local 1 // int compressionLevel
        end local 0 // io.netty.handler.codec.compression.ZlibWrapper wrapper
      LocalVariableTable:
        Start  End  Slot              Name  Signature
            0    3     0           wrapper  Lio/netty/handler/codec/compression/ZlibWrapper;
            0    3     1  compressionLevel  I
    MethodParameters:
                  Name  Flags
      wrapper           
      compressionLevel  

  public static io.netty.handler.codec.compression.ZlibEncoder newZlibEncoder(io.netty.handler.codec.compression.ZlibWrapper, int, int, int);
    descriptor: (Lio/netty/handler/codec/compression/ZlibWrapper;III)Lio/netty/handler/codec/compression/ZlibEncoder;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=6, locals=4, args_size=4
        start local 0 // io.netty.handler.codec.compression.ZlibWrapper wrapper
        start local 1 // int compressionLevel
        start local 2 // int windowBits
        start local 3 // int memLevel
         0: .line 79
            invokestatic io.netty.util.internal.PlatformDependent.javaVersion:()I
            bipush 7
            if_icmplt 2
            getstatic io.netty.handler.codec.compression.ZlibCodecFactory.noJdkZlibEncoder:Z
            ifne 2
         1: .line 80
            iload 2 /* windowBits */
            bipush 15
            if_icmpne 2
            iload 3 /* memLevel */
            bipush 8
            if_icmpeq 3
         2: .line 81
      StackMap locals:
      StackMap stack:
            new io.netty.handler.codec.compression.JZlibEncoder
            dup
            aload 0 /* wrapper */
            iload 1 /* compressionLevel */
            iload 2 /* windowBits */
            iload 3 /* memLevel */
            invokespecial io.netty.handler.codec.compression.JZlibEncoder.<init>:(Lio/netty/handler/codec/compression/ZlibWrapper;III)V
            areturn
         3: .line 83
      StackMap locals:
      StackMap stack:
            new io.netty.handler.codec.compression.JdkZlibEncoder
            dup
            aload 0 /* wrapper */
            iload 1 /* compressionLevel */
            invokespecial io.netty.handler.codec.compression.JdkZlibEncoder.<init>:(Lio/netty/handler/codec/compression/ZlibWrapper;I)V
            areturn
        end local 3 // int memLevel
        end local 2 // int windowBits
        end local 1 // int compressionLevel
        end local 0 // io.netty.handler.codec.compression.ZlibWrapper wrapper
      LocalVariableTable:
        Start  End  Slot              Name  Signature
            0    4     0           wrapper  Lio/netty/handler/codec/compression/ZlibWrapper;
            0    4     1  compressionLevel  I
            0    4     2        windowBits  I
            0    4     3          memLevel  I
    MethodParameters:
                  Name  Flags
      wrapper           
      compressionLevel  
      windowBits        
      memLevel          

  public static io.netty.handler.codec.compression.ZlibEncoder newZlibEncoder(byte[]);
    descriptor: ([B)Lio/netty/handler/codec/compression/ZlibEncoder;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // byte[] dictionary
         0: .line 88
            invokestatic io.netty.util.internal.PlatformDependent.javaVersion:()I
            bipush 7
            if_icmplt 1
            getstatic io.netty.handler.codec.compression.ZlibCodecFactory.noJdkZlibEncoder:Z
            ifeq 2
         1: .line 89
      StackMap locals:
      StackMap stack:
            new io.netty.handler.codec.compression.JZlibEncoder
            dup
            aload 0 /* dictionary */
            invokespecial io.netty.handler.codec.compression.JZlibEncoder.<init>:([B)V
            areturn
         2: .line 91
      StackMap locals:
      StackMap stack:
            new io.netty.handler.codec.compression.JdkZlibEncoder
            dup
            aload 0 /* dictionary */
            invokespecial io.netty.handler.codec.compression.JdkZlibEncoder.<init>:([B)V
            areturn
        end local 0 // byte[] dictionary
      LocalVariableTable:
        Start  End  Slot        Name  Signature
            0    3     0  dictionary  [B
    MethodParameters:
            Name  Flags
      dictionary  

  public static io.netty.handler.codec.compression.ZlibEncoder newZlibEncoder(int, byte[]);
    descriptor: (I[B)Lio/netty/handler/codec/compression/ZlibEncoder;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=4, locals=2, args_size=2
        start local 0 // int compressionLevel
        start local 1 // byte[] dictionary
         0: .line 96
            invokestatic io.netty.util.internal.PlatformDependent.javaVersion:()I
            bipush 7
            if_icmplt 1
            getstatic io.netty.handler.codec.compression.ZlibCodecFactory.noJdkZlibEncoder:Z
            ifeq 2
         1: .line 97
      StackMap locals:
      StackMap stack:
            new io.netty.handler.codec.compression.JZlibEncoder
            dup
            iload 0 /* compressionLevel */
            aload 1 /* dictionary */
            invokespecial io.netty.handler.codec.compression.JZlibEncoder.<init>:(I[B)V
            areturn
         2: .line 99
      StackMap locals:
      StackMap stack:
            new io.netty.handler.codec.compression.JdkZlibEncoder
            dup
            iload 0 /* compressionLevel */
            aload 1 /* dictionary */
            invokespecial io.netty.handler.codec.compression.JdkZlibEncoder.<init>:(I[B)V
            areturn
        end local 1 // byte[] dictionary
        end local 0 // int compressionLevel
      LocalVariableTable:
        Start  End  Slot              Name  Signature
            0    3     0  compressionLevel  I
            0    3     1        dictionary  [B
    MethodParameters:
                  Name  Flags
      compressionLevel  
      dictionary        

  public static io.netty.handler.codec.compression.ZlibEncoder newZlibEncoder(int, int, int, byte[]);
    descriptor: (III[B)Lio/netty/handler/codec/compression/ZlibEncoder;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=6, locals=4, args_size=4
        start local 0 // int compressionLevel
        start local 1 // int windowBits
        start local 2 // int memLevel
        start local 3 // byte[] dictionary
         0: .line 104
            invokestatic io.netty.util.internal.PlatformDependent.javaVersion:()I
            bipush 7
            if_icmplt 2
            getstatic io.netty.handler.codec.compression.ZlibCodecFactory.noJdkZlibEncoder:Z
            ifne 2
         1: .line 105
            iload 1 /* windowBits */
            bipush 15
            if_icmpne 2
            iload 2 /* memLevel */
            bipush 8
            if_icmpeq 3
         2: .line 106
      StackMap locals:
      StackMap stack:
            new io.netty.handler.codec.compression.JZlibEncoder
            dup
            iload 0 /* compressionLevel */
            iload 1 /* windowBits */
            iload 2 /* memLevel */
            aload 3 /* dictionary */
            invokespecial io.netty.handler.codec.compression.JZlibEncoder.<init>:(III[B)V
            areturn
         3: .line 108
      StackMap locals:
      StackMap stack:
            new io.netty.handler.codec.compression.JdkZlibEncoder
            dup
            iload 0 /* compressionLevel */
            aload 3 /* dictionary */
            invokespecial io.netty.handler.codec.compression.JdkZlibEncoder.<init>:(I[B)V
            areturn
        end local 3 // byte[] dictionary
        end local 2 // int memLevel
        end local 1 // int windowBits
        end local 0 // int compressionLevel
      LocalVariableTable:
        Start  End  Slot              Name  Signature
            0    4     0  compressionLevel  I
            0    4     1        windowBits  I
            0    4     2          memLevel  I
            0    4     3        dictionary  [B
    MethodParameters:
                  Name  Flags
      compressionLevel  
      windowBits        
      memLevel          
      dictionary        

  public static io.netty.handler.codec.compression.ZlibDecoder newZlibDecoder();
    descriptor: ()Lio/netty/handler/codec/compression/ZlibDecoder;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=0, args_size=0
         0: .line 113
            invokestatic io.netty.util.internal.PlatformDependent.javaVersion:()I
            bipush 7
            if_icmplt 1
            getstatic io.netty.handler.codec.compression.ZlibCodecFactory.noJdkZlibDecoder:Z
            ifeq 2
         1: .line 114
      StackMap locals:
      StackMap stack:
            new io.netty.handler.codec.compression.JZlibDecoder
            dup
            invokespecial io.netty.handler.codec.compression.JZlibDecoder.<init>:()V
            areturn
         2: .line 116
      StackMap locals:
      StackMap stack:
            new io.netty.handler.codec.compression.JdkZlibDecoder
            dup
            iconst_1
            invokespecial io.netty.handler.codec.compression.JdkZlibDecoder.<init>:(Z)V
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public static io.netty.handler.codec.compression.ZlibDecoder newZlibDecoder(io.netty.handler.codec.compression.ZlibWrapper);
    descriptor: (Lio/netty/handler/codec/compression/ZlibWrapper;)Lio/netty/handler/codec/compression/ZlibDecoder;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=4, locals=1, args_size=1
        start local 0 // io.netty.handler.codec.compression.ZlibWrapper wrapper
         0: .line 121
            invokestatic io.netty.util.internal.PlatformDependent.javaVersion:()I
            bipush 7
            if_icmplt 1
            getstatic io.netty.handler.codec.compression.ZlibCodecFactory.noJdkZlibDecoder:Z
            ifeq 2
         1: .line 122
      StackMap locals:
      StackMap stack:
            new io.netty.handler.codec.compression.JZlibDecoder
            dup
            aload 0 /* wrapper */
            invokespecial io.netty.handler.codec.compression.JZlibDecoder.<init>:(Lio/netty/handler/codec/compression/ZlibWrapper;)V
            areturn
         2: .line 124
      StackMap locals:
      StackMap stack:
            new io.netty.handler.codec.compression.JdkZlibDecoder
            dup
            aload 0 /* wrapper */
            iconst_1
            invokespecial io.netty.handler.codec.compression.JdkZlibDecoder.<init>:(Lio/netty/handler/codec/compression/ZlibWrapper;Z)V
            areturn
        end local 0 // io.netty.handler.codec.compression.ZlibWrapper wrapper
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    3     0  wrapper  Lio/netty/handler/codec/compression/ZlibWrapper;
    MethodParameters:
         Name  Flags
      wrapper  

  public static io.netty.handler.codec.compression.ZlibDecoder newZlibDecoder(byte[]);
    descriptor: ([B)Lio/netty/handler/codec/compression/ZlibDecoder;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // byte[] dictionary
         0: .line 129
            invokestatic io.netty.util.internal.PlatformDependent.javaVersion:()I
            bipush 7
            if_icmplt 1
            getstatic io.netty.handler.codec.compression.ZlibCodecFactory.noJdkZlibDecoder:Z
            ifeq 2
         1: .line 130
      StackMap locals:
      StackMap stack:
            new io.netty.handler.codec.compression.JZlibDecoder
            dup
            aload 0 /* dictionary */
            invokespecial io.netty.handler.codec.compression.JZlibDecoder.<init>:([B)V
            areturn
         2: .line 132
      StackMap locals:
      StackMap stack:
            new io.netty.handler.codec.compression.JdkZlibDecoder
            dup
            aload 0 /* dictionary */
            invokespecial io.netty.handler.codec.compression.JdkZlibDecoder.<init>:([B)V
            areturn
        end local 0 // byte[] dictionary
      LocalVariableTable:
        Start  End  Slot        Name  Signature
            0    3     0  dictionary  [B
    MethodParameters:
            Name  Flags
      dictionary  

  private void <init>();
    descriptor: ()V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // io.netty.handler.codec.compression.ZlibCodecFactory this
         0: .line 136
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 138
            return
        end local 0 // io.netty.handler.codec.compression.ZlibCodecFactory this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lio/netty/handler/codec/compression/ZlibCodecFactory;
}
SourceFile: "ZlibCodecFactory.java"