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      1 {%- macro enum_value(enum, field, index) -%}
      2 {%- if field.value -%}
      3 (int) ({{field.value|expression_to_text('i32')}})
      4 {%- elif index == 0 -%}
      5 0
      6 {%- else -%}
      7 {{enum.fields[index - 1]|name}} + 1
      8 {%- endif -%}
      9 {%- endmacro -%}
     10 
     11 {%- macro enum_def(enum, top_level) -%}
     12 public {{ 'static ' if not top_level }}final class {{enum|name}} {
     13 
     14 {% for field in enum.fields %}
     15     public static final int {{field|name}} = {{enum_value(enum, field, loop.index0)}};
     16 {% endfor %}
     17 
     18     private static final boolean IS_EXTENSIBLE = {% if enum.extensible %}true{% else %}false{% endif %};
     19 
     20     public static boolean isKnownValue(int value) {
     21 {%- if enum.fields %}
     22         switch (value) {
     23 {%-   for enum_field in enum.fields|groupby('numeric_value') %}
     24             case {{enum_field[0]}}:
     25 {%-   endfor %}
     26                 return true;
     27         }
     28 {%- endif %}
     29         return false;
     30     }
     31 
     32     public static void validate(int value) {
     33         if (IS_EXTENSIBLE || isKnownValue(value))
     34             return;
     35 
     36         throw new DeserializationException("Invalid enum value.");
     37     }
     38 
     39     private {{enum|name}}() {}
     40 
     41 }
     42 {%- endmacro -%}
     43