Class FunctionClosure

src/main/java/org/apache/groovy/util/Closures.java:168–195

Hybrid one-argument function that is both a Closure and a Function. @since 6.0.0

     * @since 6.0.0
     */
    public static class FunctionClosure<T, R> extends Closure<R> implements Function<T, R> {
        @Serial private static final long serialVersionUID = 1L;
        private final Function<T, R> delegate;

        FunctionClosure(Function<T, R> delegate) {
            super(null, null);
            this.delegate = delegate;
            this.maximumNumberOfParameters = 1;
            this.parameterTypes = new Class<?>[]{Object.class};
        }

        @Override
        public R apply(T t) {
            return delegate.apply(t);
        }

        @Override
        @SuppressWarnings("unchecked")
        public R call(Object arg) {
            return apply((T) arg);
        }

        @Override
        @SuppressWarnings("unchecked")
        public R call(Object... args) {
            return apply((T) args[0]);
        }
    }

    /**
     * Hybrid one-argument function that is both a {@link Closure} and a