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.MapLookup implements org.apache.logging.log4j.core.lookup.StrLookup
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.apache.logging.log4j.core.lookup.MapLookup
  super_class: java.lang.Object
{
  private final java.util.Map<java.lang.String, java.lang.String> map;
    descriptor: Ljava/util/Map;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL
    Signature: Ljava/util/Map<Ljava/lang/String;Ljava/lang/String;>;

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // org.apache.logging.log4j.core.lookup.MapLookup this
         0: .line 41
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 42
            aload 0 /* this */
            aconst_null
            putfield org.apache.logging.log4j.core.lookup.MapLookup.map:Ljava/util/Map;
         2: .line 43
            return
        end local 0 // org.apache.logging.log4j.core.lookup.MapLookup this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lorg/apache/logging/log4j/core/lookup/MapLookup;

  public void <init>(java.util.Map<java.lang.String, java.lang.String>);
    descriptor: (Ljava/util/Map;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.apache.logging.log4j.core.lookup.MapLookup this
        start local 1 // java.util.Map map
         0: .line 51
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 52
            aload 0 /* this */
            aload 1 /* map */
            putfield org.apache.logging.log4j.core.lookup.MapLookup.map:Ljava/util/Map;
         2: .line 53
            return
        end local 1 // java.util.Map map
        end local 0 // org.apache.logging.log4j.core.lookup.MapLookup this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lorg/apache/logging/log4j/core/lookup/MapLookup;
            0    3     1   map  Ljava/util/Map<Ljava/lang/String;Ljava/lang/String;>;
    Signature: (Ljava/util/Map<Ljava/lang/String;Ljava/lang/String;>;)V
    MethodParameters:
      Name  Flags
      map   final

  static java.util.Map<java.lang.String, java.lang.String> initMap(java.lang.String[], java.util.Map<java.lang.String, java.lang.String>);
    descriptor: ([Ljava/lang/String;Ljava/util/Map;)Ljava/util/Map;
    flags: (0x0008) ACC_STATIC
    Code:
      stack=4, locals=5, args_size=2
        start local 0 // java.lang.String[] srcArgs
        start local 1 // java.util.Map destMap
         0: .line 56
            iconst_0
            istore 2 /* i */
        start local 2 // int i
         1: goto 9
         2: .line 57
      StackMap locals: int
      StackMap stack:
            iload 2 /* i */
            iconst_1
            iadd
            istore 3 /* next */
        start local 3 // int next
         3: .line 58
            aload 0 /* srcArgs */
            iload 2 /* i */
            aaload
            astore 4 /* value */
        start local 4 // java.lang.String value
         4: .line 59
            aload 1 /* destMap */
            iload 2 /* i */
            invokestatic java.lang.Integer.toString:(I)Ljava/lang/String;
            aload 4 /* value */
            invokeinterface java.util.Map.put:(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
            pop
         5: .line 60
            aload 1 /* destMap */
            aload 4 /* value */
            iload 3 /* next */
            aload 0 /* srcArgs */
            arraylength
            if_icmpge 6
            aload 0 /* srcArgs */
            iload 3 /* next */
            aaload
            goto 7
      StackMap locals: java.lang.String[] java.util.Map int int java.lang.String
      StackMap stack: java.util.Map java.lang.String
         6: aconst_null
      StackMap locals: java.lang.String[] java.util.Map int int java.lang.String
      StackMap stack: java.util.Map java.lang.String java.lang.String
         7: invokeinterface java.util.Map.put:(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
            pop
        end local 4 // java.lang.String value
        end local 3 // int next
         8: .line 56
            iinc 2 /* i */ 1
      StackMap locals:
      StackMap stack:
         9: iload 2 /* i */
            aload 0 /* srcArgs */
            arraylength
            if_icmplt 2
        end local 2 // int i
        10: .line 62
            aload 1 /* destMap */
            areturn
        end local 1 // java.util.Map destMap
        end local 0 // java.lang.String[] srcArgs
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0   11     0  srcArgs  [Ljava/lang/String;
            0   11     1  destMap  Ljava/util/Map<Ljava/lang/String;Ljava/lang/String;>;
            1   10     2        i  I
            3    8     3     next  I
            4    8     4    value  Ljava/lang/String;
    Signature: ([Ljava/lang/String;Ljava/util/Map<Ljava/lang/String;Ljava/lang/String;>;)Ljava/util/Map<Ljava/lang/String;Ljava/lang/String;>;
    MethodParameters:
         Name  Flags
      srcArgs  final
      destMap  final

  static java.util.HashMap<java.lang.String, java.lang.String> newMap(int);
    descriptor: (I)Ljava/util/HashMap;
    flags: (0x0008) ACC_STATIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // int initialCapacity
         0: .line 66
            new java.util.HashMap
            dup
            iload 0 /* initialCapacity */
            invokespecial java.util.HashMap.<init>:(I)V
            areturn
        end local 0 // int initialCapacity
      LocalVariableTable:
        Start  End  Slot             Name  Signature
            0    1     0  initialCapacity  I
    Signature: (I)Ljava/util/HashMap<Ljava/lang/String;Ljava/lang/String;>;
    MethodParameters:
                 Name  Flags
      initialCapacity  final

  public static void setMainArguments(java.lang.String[]);
    descriptor: ([Ljava/lang/String;)V
    flags: (0x0089) ACC_PUBLIC, ACC_STATIC, ACC_VARARGS
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // java.lang.String[] args
         0: .line 97
            aload 0 /* args */
            invokestatic org.apache.logging.log4j.core.lookup.MainMapLookup.setMainArguments:([Ljava/lang/String;)V
         1: .line 98
            return
        end local 0 // java.lang.String[] args
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  args  [Ljava/lang/String;
    RuntimeVisibleAnnotations: 
      java.lang.Deprecated()
    MethodParameters:
      Name  Flags
      args  final

  static java.util.Map<java.lang.String, java.lang.String> toMap(java.util.List<java.lang.String>);
    descriptor: (Ljava/util/List;)Ljava/util/Map;
    flags: (0x0008) ACC_STATIC
    Code:
      stack=2, locals=2, args_size=1
        start local 0 // java.util.List args
         0: .line 101
            aload 0 /* args */
            ifnonnull 2
         1: .line 102
            aconst_null
            areturn
         2: .line 104
      StackMap locals:
      StackMap stack:
            aload 0 /* args */
            invokeinterface java.util.List.size:()I
            istore 1 /* size */
        start local 1 // int size
         3: .line 105
            aload 0 /* args */
            iload 1 /* size */
            anewarray java.lang.String
            invokeinterface java.util.List.toArray:([Ljava/lang/Object;)[Ljava/lang/Object;
            checkcast java.lang.String[]
            iload 1 /* size */
            invokestatic org.apache.logging.log4j.core.lookup.MapLookup.newMap:(I)Ljava/util/HashMap;
            invokestatic org.apache.logging.log4j.core.lookup.MapLookup.initMap:([Ljava/lang/String;Ljava/util/Map;)Ljava/util/Map;
            areturn
        end local 1 // int size
        end local 0 // java.util.List args
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    4     0  args  Ljava/util/List<Ljava/lang/String;>;
            3    4     1  size  I
    Signature: (Ljava/util/List<Ljava/lang/String;>;)Ljava/util/Map<Ljava/lang/String;Ljava/lang/String;>;
    MethodParameters:
      Name  Flags
      args  final

  static java.util.Map<java.lang.String, java.lang.String> toMap(java.lang.String[]);
    descriptor: ([Ljava/lang/String;)Ljava/util/Map;
    flags: (0x0008) ACC_STATIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // java.lang.String[] args
         0: .line 109
            aload 0 /* args */
            ifnonnull 2
         1: .line 110
            aconst_null
            areturn
         2: .line 112
      StackMap locals:
      StackMap stack:
            aload 0 /* args */
            aload 0 /* args */
            arraylength
            invokestatic org.apache.logging.log4j.core.lookup.MapLookup.newMap:(I)Ljava/util/HashMap;
            invokestatic org.apache.logging.log4j.core.lookup.MapLookup.initMap:([Ljava/lang/String;Ljava/util/Map;)Ljava/util/Map;
            areturn
        end local 0 // java.lang.String[] args
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  args  [Ljava/lang/String;
    Signature: ([Ljava/lang/String;)Ljava/util/Map<Ljava/lang/String;Ljava/lang/String;>;
    MethodParameters:
      Name  Flags
      args  final

  protected java.util.Map<java.lang.String, java.lang.String> getMap();
    descriptor: ()Ljava/util/Map;
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.apache.logging.log4j.core.lookup.MapLookup this
         0: .line 116
            aload 0 /* this */
            getfield org.apache.logging.log4j.core.lookup.MapLookup.map:Ljava/util/Map;
            areturn
        end local 0 // org.apache.logging.log4j.core.lookup.MapLookup this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/apache/logging/log4j/core/lookup/MapLookup;
    Signature: ()Ljava/util/Map<Ljava/lang/String;Ljava/lang/String;>;

  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=5, args_size=3
        start local 0 // org.apache.logging.log4j.core.lookup.MapLookup this
        start local 1 // org.apache.logging.log4j.core.LogEvent event
        start local 2 // java.lang.String key
         0: .line 121
            aload 1 /* event */
            ifnull 1
            aload 1 /* event */
            invokeinterface org.apache.logging.log4j.core.LogEvent.getMessage:()Lorg/apache/logging/log4j/message/Message;
            instanceof org.apache.logging.log4j.message.MapMessage
            ifeq 1
            iconst_1
            goto 2
      StackMap locals:
      StackMap stack:
         1: iconst_0
      StackMap locals:
      StackMap stack: int
         2: istore 3 /* isMapMessage */
        start local 3 // boolean isMapMessage
         3: .line 122
            aload 0 /* this */
            getfield org.apache.logging.log4j.core.lookup.MapLookup.map:Ljava/util/Map;
            ifnonnull 5
            iload 3 /* isMapMessage */
            ifne 5
         4: .line 123
            aconst_null
            areturn
         5: .line 125
      StackMap locals: int
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.logging.log4j.core.lookup.MapLookup.map:Ljava/util/Map;
            ifnull 9
            aload 0 /* this */
            getfield org.apache.logging.log4j.core.lookup.MapLookup.map:Ljava/util/Map;
            aload 2 /* key */
            invokeinterface java.util.Map.containsKey:(Ljava/lang/Object;)Z
            ifeq 9
         6: .line 126
            aload 0 /* this */
            getfield org.apache.logging.log4j.core.lookup.MapLookup.map:Ljava/util/Map;
            aload 2 /* key */
            invokeinterface java.util.Map.get:(Ljava/lang/Object;)Ljava/lang/Object;
            checkcast java.lang.String
            astore 4 /* obj */
        start local 4 // java.lang.String obj
         7: .line 127
            aload 4 /* obj */
            ifnull 9
         8: .line 128
            aload 4 /* obj */
            areturn
        end local 4 // java.lang.String obj
         9: .line 131
      StackMap locals:
      StackMap stack:
            iload 3 /* isMapMessage */
            ifeq 11
        10: .line 132
            aload 1 /* event */
            invokeinterface org.apache.logging.log4j.core.LogEvent.getMessage:()Lorg/apache/logging/log4j/message/Message;
            checkcast org.apache.logging.log4j.message.MapMessage
            aload 2 /* key */
            invokevirtual org.apache.logging.log4j.message.MapMessage.get:(Ljava/lang/String;)Ljava/lang/String;
            areturn
        11: .line 134
      StackMap locals:
      StackMap stack:
            aconst_null
            areturn
        end local 3 // boolean isMapMessage
        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.MapLookup this
      LocalVariableTable:
        Start  End  Slot          Name  Signature
            0   12     0          this  Lorg/apache/logging/log4j/core/lookup/MapLookup;
            0   12     1         event  Lorg/apache/logging/log4j/core/LogEvent;
            0   12     2           key  Ljava/lang/String;
            3   12     3  isMapMessage  Z
            7    9     4           obj  Ljava/lang/String;
    MethodParameters:
       Name  Flags
      event  final
      key    final

  public java.lang.String lookup(java.lang.String);
    descriptor: (Ljava/lang/String;)Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.apache.logging.log4j.core.lookup.MapLookup this
        start local 1 // java.lang.String key
         0: .line 149
            aload 0 /* this */
            getfield org.apache.logging.log4j.core.lookup.MapLookup.map:Ljava/util/Map;
            ifnonnull 2
         1: .line 150
            aconst_null
            areturn
         2: .line 152
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.logging.log4j.core.lookup.MapLookup.map:Ljava/util/Map;
            aload 1 /* key */
            invokeinterface java.util.Map.get:(Ljava/lang/Object;)Ljava/lang/Object;
            checkcast java.lang.String
            areturn
        end local 1 // java.lang.String key
        end local 0 // org.apache.logging.log4j.core.lookup.MapLookup this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lorg/apache/logging/log4j/core/lookup/MapLookup;
            0    3     1   key  Ljava/lang/String;
    MethodParameters:
      Name  Flags
      key   final
}
SourceFile: "MapLookup.java"
    RuntimeVisibleAnnotations: 
      org.apache.logging.log4j.core.config.plugins.Plugin(name = "map", category = "Lookup")