https://logging.apache.org/log4j/2.x/log4j-core/: The Apache Log4j Implementation (The Apache Software Foundation)
  • Ralph Goers (Nextiva)
  • Gary Gregory (Rocket Software)
  • Scott Deboy
  • Remko Popma
  • Nick Williams
  • Matt Sicker (CloudBees)
  • Bruce Brouwer
  • Mikael Ståldal (Spotify)
  • Carter Kozak 
public class org.apache.logging.log4j.core.lookup.EventLookup extends org.apache.logging.log4j.core.lookup.AbstractLookup
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.apache.logging.log4j.core.lookup.EventLookup
  super_class: org.apache.logging.log4j.core.lookup.AbstractLookup
{
  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.apache.logging.log4j.core.lookup.EventLookup this
         0: .line 26
            aload 0 /* this */
            invokespecial org.apache.logging.log4j.core.lookup.AbstractLookup.<init>:()V
            return
        end local 0 // org.apache.logging.log4j.core.lookup.EventLookup this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/apache/logging/log4j/core/lookup/EventLookup;

  public java.lang.String lookup(org.apache.logging.log4j.core.LogEvent, java.lang.String);
    descriptor: (Lorg/apache/logging/log4j/core/LogEvent;Ljava/lang/String;)Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=4, args_size=3
        start local 0 // org.apache.logging.log4j.core.lookup.EventLookup this
        start local 1 // org.apache.logging.log4j.core.LogEvent event
        start local 2 // java.lang.String key
         0: .line 36
            aload 2 /* key */
            dup
            astore 3
            invokevirtual java.lang.String.hashCode:()I
            lookupswitch { // 8
          -2013470288: 1
          -1997438886: 2
          -1675388953: 3
           -809373649: 4
             73313124: 5
            808305621: 6
           1538269413: 7
           2059094262: 8
              default: 23
          }
      StackMap locals: java.lang.String
      StackMap stack:
         1: aload 3
            ldc "Logger"
            invokevirtual java.lang.String.equals:(Ljava/lang/Object;)Z
            ifne 21
            goto 23
      StackMap locals:
      StackMap stack:
         2: aload 3
            ldc "Marker"
            invokevirtual java.lang.String.equals:(Ljava/lang/Object;)Z
            ifne 9
            goto 23
      StackMap locals:
      StackMap stack:
         3: aload 3
            ldc "Message"
            invokevirtual java.lang.String.equals:(Ljava/lang/Object;)Z
            ifne 22
            goto 23
      StackMap locals:
      StackMap stack:
         4: aload 3
            ldc "Exception"
            invokevirtual java.lang.String.equals:(Ljava/lang/Object;)Z
            ifne 16
            goto 23
      StackMap locals:
      StackMap stack:
         5: aload 3
            ldc "Level"
            invokevirtual java.lang.String.equals:(Ljava/lang/Object;)Z
            ifne 13
            goto 23
      StackMap locals:
      StackMap stack:
         6: aload 3
            ldc "ThreadName"
            invokevirtual java.lang.String.equals:(Ljava/lang/Object;)Z
            ifne 12
            goto 23
      StackMap locals:
      StackMap stack:
         7: aload 3
            ldc "ThreadId"
            invokevirtual java.lang.String.equals:(Ljava/lang/Object;)Z
            ifne 14
            goto 23
      StackMap locals:
      StackMap stack:
         8: aload 3
            ldc "Timestamp"
            invokevirtual java.lang.String.equals:(Ljava/lang/Object;)Z
            ifne 15
            goto 23
         9: .line 38
      StackMap locals:
      StackMap stack:
            aload 1 /* event */
            invokeinterface org.apache.logging.log4j.core.LogEvent.getMarker:()Lorg/apache/logging/log4j/Marker;
            ifnull 10
            aload 1 /* event */
            invokeinterface org.apache.logging.log4j.core.LogEvent.getMarker:()Lorg/apache/logging/log4j/Marker;
            invokeinterface org.apache.logging.log4j.Marker.getName:()Ljava/lang/String;
            goto 11
      StackMap locals:
      StackMap stack:
        10: aconst_null
      StackMap locals:
      StackMap stack: java.lang.String
        11: areturn
        12: .line 41
      StackMap locals:
      StackMap stack:
            aload 1 /* event */
            invokeinterface org.apache.logging.log4j.core.LogEvent.getThreadName:()Ljava/lang/String;
            areturn
        13: .line 44
      StackMap locals:
      StackMap stack:
            aload 1 /* event */
            invokeinterface org.apache.logging.log4j.core.LogEvent.getLevel:()Lorg/apache/logging/log4j/Level;
            invokevirtual org.apache.logging.log4j.Level.toString:()Ljava/lang/String;
            areturn
        14: .line 47
      StackMap locals:
      StackMap stack:
            aload 1 /* event */
            invokeinterface org.apache.logging.log4j.core.LogEvent.getThreadId:()J
            invokestatic java.lang.Long.toString:(J)Ljava/lang/String;
            areturn
        15: .line 50
      StackMap locals:
      StackMap stack:
            aload 1 /* event */
            invokeinterface org.apache.logging.log4j.core.LogEvent.getTimeMillis:()J
            invokestatic java.lang.Long.toString:(J)Ljava/lang/String;
            areturn
        16: .line 53
      StackMap locals:
      StackMap stack:
            aload 1 /* event */
            invokeinterface org.apache.logging.log4j.core.LogEvent.getThrown:()Ljava/lang/Throwable;
            ifnull 18
        17: .line 54
            aload 1 /* event */
            invokeinterface org.apache.logging.log4j.core.LogEvent.getThrown:()Ljava/lang/Throwable;
            invokevirtual java.lang.Object.getClass:()Ljava/lang/Class;
            invokevirtual java.lang.Class.getSimpleName:()Ljava/lang/String;
            areturn
        18: .line 56
      StackMap locals:
      StackMap stack:
            aload 1 /* event */
            invokeinterface org.apache.logging.log4j.core.LogEvent.getThrownProxy:()Lorg/apache/logging/log4j/core/impl/ThrowableProxy;
            ifnull 20
        19: .line 57
            aload 1 /* event */
            invokeinterface org.apache.logging.log4j.core.LogEvent.getThrownProxy:()Lorg/apache/logging/log4j/core/impl/ThrowableProxy;
            invokevirtual org.apache.logging.log4j.core.impl.ThrowableProxy.getName:()Ljava/lang/String;
            areturn
        20: .line 59
      StackMap locals:
      StackMap stack:
            aconst_null
            areturn
        21: .line 62
      StackMap locals:
      StackMap stack:
            aload 1 /* event */
            invokeinterface org.apache.logging.log4j.core.LogEvent.getLoggerName:()Ljava/lang/String;
            areturn
        22: .line 65
      StackMap locals:
      StackMap stack:
            aload 1 /* event */
            invokeinterface org.apache.logging.log4j.core.LogEvent.getMessage:()Lorg/apache/logging/log4j/message/Message;
            invokeinterface org.apache.logging.log4j.message.Message.getFormattedMessage:()Ljava/lang/String;
            areturn
        23: .line 68
      StackMap locals:
      StackMap stack:
            aconst_null
            areturn
        end local 2 // java.lang.String key
        end local 1 // org.apache.logging.log4j.core.LogEvent event
        end local 0 // org.apache.logging.log4j.core.lookup.EventLookup this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0   24     0   this  Lorg/apache/logging/log4j/core/lookup/EventLookup;
            0   24     1  event  Lorg/apache/logging/log4j/core/LogEvent;
            0   24     2    key  Ljava/lang/String;
    MethodParameters:
       Name  Flags
      event  final
      key    final
}
SourceFile: "EventLookup.java"
    RuntimeVisibleAnnotations: 
      org.apache.logging.log4j.core.config.plugins.Plugin(name = "event", category = "Lookup")