JMeta usage example v1

@Meta({
    @Do(
        // Possible values: ModifyStatements.Type.{
        //     REMOVE_STATEMENT, ADD_METHOD, REMOVE_METHOD, ADD_FIELD, REMOVE_FIELD, GENERATE_CLASS
        // }
        // Note that there is no task for manipulating subclasses because subclasses are not actually "sub"classes
        type = ModifyStatements.Type.APPEND_STATEMENT,
        // These fields are (mostly) specific to ModifyStatements.Type.APPEND
        to = @SelectEntity("<staticInit>"), // <staticInit> is a special way to refer to it created by JMeta
        // All sequences contain entities
        statements = @Statements(
            source = @SelectEntity(value = MetaEntities.FIELDS, target = Block.class),
            operations = {
                // `expr` and `clazz` are specific to some types as well
                @Op(type = Op.Type.FILTER_INSTANCEOF, expr = @InstanceOf(expr = @TypeOfEntity, clazz = Block.class)),
            },
            // Finalize refers to a @MetaStatement method in the current class. The method must recieve the results' type
            // from previous processing steps (field -> MetaField<T>, method -> MetaMethod)
            finalize = "addBlockStatement"
        )
    )
})
class MetaProgrammingExample {
    static {} // For @SelectEntity("<staticInit>"), technically not needed because java compiler auto-generates them

    public static final List<Block> BLOCKS = new ArrayList<>();

    // Excludes this method in the final output
    // All usages of @MetaStatement require the method have `void` return type and
    @MetaStatement
    private static void addBlockStatement(MetaField<Block> field) {
        BLOCKS.add(field.getValue(null));
    }
}