https://freemarker.apache.org/: FreeMarker is a "template engine"; a generic tool to generate text output based on templates. (Apache Software Foundation) 
final class freemarker.core.Identifier extends freemarker.core.Expression
  minor version: 0
  major version: 59
  flags: flags: (0x0030) ACC_FINAL, ACC_SUPER
  this_class: freemarker.core.Identifier
  super_class: freemarker.core.Expression
{
  private final java.lang.String name;
    descriptor: Ljava/lang/String;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  void <init>(java.lang.String);
    descriptor: (Ljava/lang/String;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // freemarker.core.Identifier this
        start local 1 // java.lang.String name
         0: .line 32
            aload 0 /* this */
            invokespecial freemarker.core.Expression.<init>:()V
         1: .line 33
            aload 0 /* this */
            aload 1 /* name */
            putfield freemarker.core.Identifier.name:Ljava/lang/String;
         2: .line 34
            return
        end local 1 // java.lang.String name
        end local 0 // freemarker.core.Identifier this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lfreemarker/core/Identifier;
            0    3     1  name  Ljava/lang/String;
    MethodParameters:
      Name  Flags
      name  

  freemarker.template.TemplateModel _eval(freemarker.core.Environment);
    descriptor: (Lfreemarker/core/Environment;)Lfreemarker/template/TemplateModel;
    flags: (0x0000) 
    Code:
      stack=6, locals=3, args_size=2
        start local 0 // freemarker.core.Identifier this
        start local 1 // freemarker.core.Environment env
         0: .line 39
            aload 1 /* env */
            aload 0 /* this */
            getfield freemarker.core.Identifier.name:Ljava/lang/String;
            invokevirtual freemarker.core.Environment.getVariable:(Ljava/lang/String;)Lfreemarker/template/TemplateModel;
         1: areturn
         2: .line 40
      StackMap locals:
      StackMap stack: java.lang.NullPointerException
            astore 2 /* e */
        start local 2 // java.lang.NullPointerException e
         3: .line 41
            aload 1 /* env */
            ifnonnull 8
         4: .line 42
            new freemarker.core._MiscTemplateException
            dup
            iconst_2
            anewarray java.lang.Object
            dup
            iconst_0
         5: .line 43
            ldc "Variables are not available (certainly you are in a parse-time executed directive). The name of the variable you tried to read: "
            aastore
            dup
            iconst_1
         6: .line 44
            aload 0 /* this */
            getfield freemarker.core.Identifier.name:Ljava/lang/String;
         7: .line 42
            aastore
            invokespecial freemarker.core._MiscTemplateException.<init>:([Ljava/lang/Object;)V
            athrow
         8: .line 46
      StackMap locals: java.lang.NullPointerException
      StackMap stack:
            aload 2 /* e */
            athrow
        end local 2 // java.lang.NullPointerException e
        end local 1 // freemarker.core.Environment env
        end local 0 // freemarker.core.Identifier this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    9     0  this  Lfreemarker/core/Identifier;
            0    9     1   env  Lfreemarker/core/Environment;
            3    9     2     e  Ljava/lang/NullPointerException;
      Exception table:
        from    to  target  type
           0     1       2  Class java.lang.NullPointerException
    Exceptions:
      throws freemarker.template.TemplateException
    MethodParameters:
      Name  Flags
      env   

  public java.lang.String getCanonicalForm();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // freemarker.core.Identifier this
         0: .line 53
            aload 0 /* this */
            getfield freemarker.core.Identifier.name:Ljava/lang/String;
            invokestatic freemarker.core._CoreStringUtils.toFTLTopLevelIdentifierReference:(Ljava/lang/String;)Ljava/lang/String;
            areturn
        end local 0 // freemarker.core.Identifier this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lfreemarker/core/Identifier;

  java.lang.String getName();
    descriptor: ()Ljava/lang/String;
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // freemarker.core.Identifier this
         0: .line 60
            aload 0 /* this */
            getfield freemarker.core.Identifier.name:Ljava/lang/String;
            areturn
        end local 0 // freemarker.core.Identifier this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lfreemarker/core/Identifier;

  java.lang.String getNodeTypeSymbol();
    descriptor: ()Ljava/lang/String;
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // freemarker.core.Identifier this
         0: .line 65
            aload 0 /* this */
            invokevirtual freemarker.core.Identifier.getCanonicalForm:()Ljava/lang/String;
            areturn
        end local 0 // freemarker.core.Identifier this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lfreemarker/core/Identifier;

  boolean isLiteral();
    descriptor: ()Z
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // freemarker.core.Identifier this
         0: .line 70
            iconst_0
            ireturn
        end local 0 // freemarker.core.Identifier this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lfreemarker/core/Identifier;

  int getParameterCount();
    descriptor: ()I
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // freemarker.core.Identifier this
         0: .line 75
            iconst_0
            ireturn
        end local 0 // freemarker.core.Identifier this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lfreemarker/core/Identifier;

  java.lang.Object getParameterValue(int);
    descriptor: (I)Ljava/lang/Object;
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // freemarker.core.Identifier this
        start local 1 // int idx
         0: .line 80
            new java.lang.IndexOutOfBoundsException
            dup
            invokespecial java.lang.IndexOutOfBoundsException.<init>:()V
            athrow
        end local 1 // int idx
        end local 0 // freemarker.core.Identifier this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lfreemarker/core/Identifier;
            0    1     1   idx  I
    MethodParameters:
      Name  Flags
      idx   

  freemarker.core.ParameterRole getParameterRole(int);
    descriptor: (I)Lfreemarker/core/ParameterRole;
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // freemarker.core.Identifier this
        start local 1 // int idx
         0: .line 85
            new java.lang.IndexOutOfBoundsException
            dup
            invokespecial java.lang.IndexOutOfBoundsException.<init>:()V
            athrow
        end local 1 // int idx
        end local 0 // freemarker.core.Identifier this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lfreemarker/core/Identifier;
            0    1     1   idx  I
    MethodParameters:
      Name  Flags
      idx   

  protected freemarker.core.Expression deepCloneWithIdentifierReplaced_inner(java.lang.String, freemarker.core.Expression, freemarker.core.Expression$ReplacemenetState);
    descriptor: (Ljava/lang/String;Lfreemarker/core/Expression;Lfreemarker/core/Expression$ReplacemenetState;)Lfreemarker/core/Expression;
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=4, locals=5, args_size=4
        start local 0 // freemarker.core.Identifier this
        start local 1 // java.lang.String replacedIdentifier
        start local 2 // freemarker.core.Expression replacement
        start local 3 // freemarker.core.Expression$ReplacemenetState replacementState
         0: .line 91
            aload 0 /* this */
            getfield freemarker.core.Identifier.name:Ljava/lang/String;
            aload 1 /* replacedIdentifier */
            invokevirtual java.lang.String.equals:(Ljava/lang/Object;)Z
            ifeq 7
         1: .line 92
            aload 3 /* replacementState */
            getfield freemarker.core.Expression$ReplacemenetState.replacementAlreadyInUse:Z
            ifeq 5
         2: .line 93
            aload 2 /* replacement */
            aconst_null
            aconst_null
            aload 3 /* replacementState */
            invokevirtual freemarker.core.Expression.deepCloneWithIdentifierReplaced:(Ljava/lang/String;Lfreemarker/core/Expression;Lfreemarker/core/Expression$ReplacemenetState;)Lfreemarker/core/Expression;
            astore 4 /* clone */
        start local 4 // freemarker.core.Expression clone
         3: .line 94
            aload 4 /* clone */
            aload 2 /* replacement */
            invokevirtual freemarker.core.Expression.copyLocationFrom:(Lfreemarker/core/TemplateObject;)Lfreemarker/core/TemplateObject;
            pop
         4: .line 95
            aload 4 /* clone */
            areturn
        end local 4 // freemarker.core.Expression clone
         5: .line 97
      StackMap locals:
      StackMap stack:
            aload 3 /* replacementState */
            iconst_1
            putfield freemarker.core.Expression$ReplacemenetState.replacementAlreadyInUse:Z
         6: .line 98
            aload 2 /* replacement */
            areturn
         7: .line 101
      StackMap locals:
      StackMap stack:
            new freemarker.core.Identifier
            dup
            aload 0 /* this */
            getfield freemarker.core.Identifier.name:Ljava/lang/String;
            invokespecial freemarker.core.Identifier.<init>:(Ljava/lang/String;)V
            areturn
        end local 3 // freemarker.core.Expression$ReplacemenetState replacementState
        end local 2 // freemarker.core.Expression replacement
        end local 1 // java.lang.String replacedIdentifier
        end local 0 // freemarker.core.Identifier this
      LocalVariableTable:
        Start  End  Slot                Name  Signature
            0    8     0                this  Lfreemarker/core/Identifier;
            0    8     1  replacedIdentifier  Ljava/lang/String;
            0    8     2         replacement  Lfreemarker/core/Expression;
            0    8     3    replacementState  Lfreemarker/core/Expression$ReplacemenetState;
            3    5     4               clone  Lfreemarker/core/Expression;
    MethodParameters:
                    Name  Flags
      replacedIdentifier  
      replacement         
      replacementState    
}
SourceFile: "Identifier.java"
InnerClasses:
  ReplacemenetState = freemarker.core.Expression$ReplacemenetState of freemarker.core.Expression