src/main/java/bjc/functypes/ClosableFunction.java


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package bjc.functypes;

import java.util.function.Function;

/**
 * A function associated with a closable resource
 * 
 * @param <T> The input type
 * @param <R> The result type
 */
public interface ClosableFunction<T, R> extends AutoCloseable, Function<T, R> {
	/**
	 * Create a ClosableFunction from a {@link AutoCloseable} and a {@link Function}
	 * 
	 * @param <T> The input type
	 * @param <R> The result type
	 * @param f The function
	 * @param clos The AutoClosable
	 * @return The closable function
	 */
	public static <T, R> ClosableFunction<T, R> bindFunction(Function<T, R> f, AutoCloseable clos) {
		return new ClosableFunction<T, R>() {
			@Override
			public R apply(T t) {
				return f.apply(t);
			}
			
			@Override
			public void close() throws Exception {
				clos.close();
			}
		};
	}
}