https://github.com/cglib/cglib/cglib: cglib is a powerful, high performance and quality Code Generation Library, It is used to extend JAVA classes and implements interfaces at runtime. 
public class net.sf.cglib.util.StringSwitcher$Generator extends net.sf.cglib.core.AbstractClassGenerator
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: net.sf.cglib.util.StringSwitcher$Generator
  super_class: net.sf.cglib.core.AbstractClassGenerator
{
  private static final net.sf.cglib.core.AbstractClassGenerator$Source SOURCE;
    descriptor: Lnet/sf/cglib/core/AbstractClassGenerator$Source;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL

  private java.lang.String[] strings;
    descriptor: [Ljava/lang/String;
    flags: (0x0002) ACC_PRIVATE

  private int[] ints;
    descriptor: [I
    flags: (0x0002) ACC_PRIVATE

  private boolean fixedInput;
    descriptor: Z
    flags: (0x0002) ACC_PRIVATE

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=3, locals=0, args_size=0
         0: .line 69
            new net.sf.cglib.core.AbstractClassGenerator$Source
            dup
            ldc Lnet/sf/cglib/util/StringSwitcher;
            invokevirtual java.lang.Class.getName:()Ljava/lang/String;
            invokespecial net.sf.cglib.core.AbstractClassGenerator$Source.<init>:(Ljava/lang/String;)V
            putstatic net.sf.cglib.util.StringSwitcher$Generator.SOURCE:Lnet/sf/cglib/core/AbstractClassGenerator$Source;
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // net.sf.cglib.util.StringSwitcher$Generator this
         0: .line 76
            aload 0 /* this */
            getstatic net.sf.cglib.util.StringSwitcher$Generator.SOURCE:Lnet/sf/cglib/core/AbstractClassGenerator$Source;
            invokespecial net.sf.cglib.core.AbstractClassGenerator.<init>:(Lnet/sf/cglib/core/AbstractClassGenerator$Source;)V
         1: .line 77
            return
        end local 0 // net.sf.cglib.util.StringSwitcher$Generator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lnet/sf/cglib/util/StringSwitcher$Generator;

  public void setStrings(java.lang.String[]);
    descriptor: ([Ljava/lang/String;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // net.sf.cglib.util.StringSwitcher$Generator this
        start local 1 // java.lang.String[] strings
         0: .line 85
            aload 0 /* this */
            aload 1 /* strings */
            putfield net.sf.cglib.util.StringSwitcher$Generator.strings:[Ljava/lang/String;
         1: .line 86
            return
        end local 1 // java.lang.String[] strings
        end local 0 // net.sf.cglib.util.StringSwitcher$Generator this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    2     0     this  Lnet/sf/cglib/util/StringSwitcher$Generator;
            0    2     1  strings  [Ljava/lang/String;
    MethodParameters:
         Name  Flags
      strings  

  public void setInts(int[]);
    descriptor: ([I)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // net.sf.cglib.util.StringSwitcher$Generator this
        start local 1 // int[] ints
         0: .line 94
            aload 0 /* this */
            aload 1 /* ints */
            putfield net.sf.cglib.util.StringSwitcher$Generator.ints:[I
         1: .line 95
            return
        end local 1 // int[] ints
        end local 0 // net.sf.cglib.util.StringSwitcher$Generator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lnet/sf/cglib/util/StringSwitcher$Generator;
            0    2     1  ints  [I
    MethodParameters:
      Name  Flags
      ints  

  public void setFixedInput(boolean);
    descriptor: (Z)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // net.sf.cglib.util.StringSwitcher$Generator this
        start local 1 // boolean fixedInput
         0: .line 103
            aload 0 /* this */
            iload 1 /* fixedInput */
            putfield net.sf.cglib.util.StringSwitcher$Generator.fixedInput:Z
         1: .line 104
            return
        end local 1 // boolean fixedInput
        end local 0 // net.sf.cglib.util.StringSwitcher$Generator this
      LocalVariableTable:
        Start  End  Slot        Name  Signature
            0    2     0        this  Lnet/sf/cglib/util/StringSwitcher$Generator;
            0    2     1  fixedInput  Z
    MethodParameters:
            Name  Flags
      fixedInput  

  protected java.lang.ClassLoader getDefaultClassLoader();
    descriptor: ()Ljava/lang/ClassLoader;
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // net.sf.cglib.util.StringSwitcher$Generator this
         0: .line 107
            aload 0 /* this */
            invokevirtual java.lang.Object.getClass:()Ljava/lang/Class;
            invokevirtual java.lang.Class.getClassLoader:()Ljava/lang/ClassLoader;
            areturn
        end local 0 // net.sf.cglib.util.StringSwitcher$Generator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lnet/sf/cglib/util/StringSwitcher$Generator;

  public net.sf.cglib.util.StringSwitcher create();
    descriptor: ()Lnet/sf/cglib/util/StringSwitcher;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=2, args_size=1
        start local 0 // net.sf.cglib.util.StringSwitcher$Generator this
         0: .line 114
            aload 0 /* this */
            ldc Lnet/sf/cglib/util/StringSwitcher;
            invokevirtual java.lang.Class.getName:()Ljava/lang/String;
            invokevirtual net.sf.cglib.util.StringSwitcher$Generator.setNamePrefix:(Ljava/lang/String;)V
         1: .line 115
            getstatic net.sf.cglib.util.StringSwitcher.KEY_FACTORY:Lnet/sf/cglib/util/StringSwitcher$StringSwitcherKey;
            aload 0 /* this */
            getfield net.sf.cglib.util.StringSwitcher$Generator.strings:[Ljava/lang/String;
            aload 0 /* this */
            getfield net.sf.cglib.util.StringSwitcher$Generator.ints:[I
            aload 0 /* this */
            getfield net.sf.cglib.util.StringSwitcher$Generator.fixedInput:Z
            invokeinterface net.sf.cglib.util.StringSwitcher$StringSwitcherKey.newInstance:([Ljava/lang/String;[IZ)Ljava/lang/Object;
            astore 1 /* key */
        start local 1 // java.lang.Object key
         2: .line 116
            aload 0 /* this */
            aload 1 /* key */
            invokespecial net.sf.cglib.core.AbstractClassGenerator.create:(Ljava/lang/Object;)Ljava/lang/Object;
            checkcast net.sf.cglib.util.StringSwitcher
            areturn
        end local 1 // java.lang.Object key
        end local 0 // net.sf.cglib.util.StringSwitcher$Generator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lnet/sf/cglib/util/StringSwitcher$Generator;
            2    3     1   key  Ljava/lang/Object;

  public void generateClass(org.objectweb.asm.ClassVisitor);
    descriptor: (Lorg/objectweb/asm/ClassVisitor;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=8, locals=6, args_size=2
        start local 0 // net.sf.cglib.util.StringSwitcher$Generator this
        start local 1 // org.objectweb.asm.ClassVisitor v
         0: .line 120
            new net.sf.cglib.core.ClassEmitter
            dup
            aload 1 /* v */
            invokespecial net.sf.cglib.core.ClassEmitter.<init>:(Lorg/objectweb/asm/ClassVisitor;)V
            astore 2 /* ce */
        start local 2 // net.sf.cglib.core.ClassEmitter ce
         1: .line 121
            aload 2 /* ce */
            bipush 52
         2: .line 122
            iconst_1
         3: .line 123
            aload 0 /* this */
            invokevirtual net.sf.cglib.util.StringSwitcher$Generator.getClassName:()Ljava/lang/String;
         4: .line 124
            getstatic net.sf.cglib.util.StringSwitcher.STRING_SWITCHER:Lorg/objectweb/asm/Type;
         5: .line 125
            aconst_null
         6: .line 126
            ldc "<generated>"
         7: .line 121
            invokevirtual net.sf.cglib.core.ClassEmitter.begin_class:(IILjava/lang/String;Lorg/objectweb/asm/Type;[Lorg/objectweb/asm/Type;Ljava/lang/String;)V
         8: .line 127
            aload 2 /* ce */
            invokestatic net.sf.cglib.core.EmitUtils.null_constructor:(Lnet/sf/cglib/core/ClassEmitter;)V
         9: .line 128
            aload 2 /* ce */
            iconst_1
            getstatic net.sf.cglib.util.StringSwitcher.INT_VALUE:Lnet/sf/cglib/core/Signature;
            aconst_null
            invokevirtual net.sf.cglib.core.ClassEmitter.begin_method:(ILnet/sf/cglib/core/Signature;[Lorg/objectweb/asm/Type;)Lnet/sf/cglib/core/CodeEmitter;
            astore 3 /* e */
        start local 3 // net.sf.cglib.core.CodeEmitter e
        10: .line 129
            aload 3 /* e */
            iconst_0
            invokevirtual net.sf.cglib.core.CodeEmitter.load_arg:(I)V
        11: .line 130
            aload 0 /* this */
            getfield net.sf.cglib.util.StringSwitcher$Generator.strings:[Ljava/lang/String;
            invokestatic java.util.Arrays.asList:([Ljava/lang/Object;)Ljava/util/List;
            astore 4 /* stringList */
        start local 4 // java.util.List stringList
        12: .line 131
            aload 0 /* this */
            getfield net.sf.cglib.util.StringSwitcher$Generator.fixedInput:Z
            ifeq 13
            iconst_2
            goto 14
      StackMap locals: net.sf.cglib.core.ClassEmitter net.sf.cglib.core.CodeEmitter java.util.List
      StackMap stack:
        13: iconst_1
      StackMap locals:
      StackMap stack: int
        14: istore 5 /* style */
        start local 5 // int style
        15: .line 132
            aload 3 /* e */
            aload 0 /* this */
            getfield net.sf.cglib.util.StringSwitcher$Generator.strings:[Ljava/lang/String;
            iload 5 /* style */
            new net.sf.cglib.util.StringSwitcher$Generator$1
            dup
            aload 0 /* this */
            aload 3 /* e */
            aload 4 /* stringList */
            invokespecial net.sf.cglib.util.StringSwitcher$Generator$1.<init>:(Lnet/sf/cglib/util/StringSwitcher$Generator;Lnet/sf/cglib/core/CodeEmitter;Ljava/util/List;)V
            invokestatic net.sf.cglib.core.EmitUtils.string_switch:(Lnet/sf/cglib/core/CodeEmitter;[Ljava/lang/String;ILnet/sf/cglib/core/ObjectSwitchCallback;)V
        16: .line 142
            aload 3 /* e */
            invokevirtual net.sf.cglib.core.CodeEmitter.end_method:()V
        17: .line 143
            aload 2 /* ce */
            invokevirtual net.sf.cglib.core.ClassEmitter.end_class:()V
        18: .line 144
            return
        end local 5 // int style
        end local 4 // java.util.List stringList
        end local 3 // net.sf.cglib.core.CodeEmitter e
        end local 2 // net.sf.cglib.core.ClassEmitter ce
        end local 1 // org.objectweb.asm.ClassVisitor v
        end local 0 // net.sf.cglib.util.StringSwitcher$Generator this
      LocalVariableTable:
        Start  End  Slot        Name  Signature
            0   19     0        this  Lnet/sf/cglib/util/StringSwitcher$Generator;
            0   19     1           v  Lorg/objectweb/asm/ClassVisitor;
            1   19     2          ce  Lnet/sf/cglib/core/ClassEmitter;
           10   19     3           e  Lnet/sf/cglib/core/CodeEmitter;
           12   19     4  stringList  Ljava/util/List;
           15   19     5       style  I
    Exceptions:
      throws java.lang.Exception
    MethodParameters:
      Name  Flags
      v     

  protected java.lang.Object firstInstance(java.lang.Class);
    descriptor: (Ljava/lang/Class;)Ljava/lang/Object;
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=1, locals=2, args_size=2
        start local 0 // net.sf.cglib.util.StringSwitcher$Generator this
        start local 1 // java.lang.Class type
         0: .line 147
            aload 1 /* type */
            invokestatic net.sf.cglib.core.ReflectUtils.newInstance:(Ljava/lang/Class;)Ljava/lang/Object;
            checkcast net.sf.cglib.util.StringSwitcher
            areturn
        end local 1 // java.lang.Class type
        end local 0 // net.sf.cglib.util.StringSwitcher$Generator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lnet/sf/cglib/util/StringSwitcher$Generator;
            0    1     1  type  Ljava/lang/Class;
    MethodParameters:
      Name  Flags
      type  

  protected java.lang.Object nextInstance(java.lang.Object);
    descriptor: (Ljava/lang/Object;)Ljava/lang/Object;
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=1, locals=2, args_size=2
        start local 0 // net.sf.cglib.util.StringSwitcher$Generator this
        start local 1 // java.lang.Object instance
         0: .line 151
            aload 1 /* instance */
            areturn
        end local 1 // java.lang.Object instance
        end local 0 // net.sf.cglib.util.StringSwitcher$Generator this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    1     0      this  Lnet/sf/cglib/util/StringSwitcher$Generator;
            0    1     1  instance  Ljava/lang/Object;
    MethodParameters:
          Name  Flags
      instance  
}
SourceFile: "StringSwitcher.java"
NestHost: net.sf.cglib.util.StringSwitcher
InnerClasses:
  protected Source = net.sf.cglib.core.AbstractClassGenerator$Source of net.sf.cglib.core.AbstractClassGenerator
  public Generator = net.sf.cglib.util.StringSwitcher$Generator of net.sf.cglib.util.StringSwitcher
  net.sf.cglib.util.StringSwitcher$Generator$1
  abstract StringSwitcherKey = net.sf.cglib.util.StringSwitcher$StringSwitcherKey of net.sf.cglib.util.StringSwitcher