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Some useful lambda implements for Java 8.

There is a newer version: 0.1.55

package com.github.phantomthief.util;

import static java.util.Objects.requireNonNull;

/**
 * @author w.vela
 */
@FunctionalInterface
public interface ThrowableFunction {

    static  ThrowableFunction identity() {
        return t -> t;
    }

    R apply(T t) throws X;

    default  ThrowableFunction
            compose(ThrowableFunction before) {
        requireNonNull(before);
        return (V v) -> apply(before.apply(v));
    }

    default  ThrowableFunction
            andThen(ThrowableFunction after) {
        requireNonNull(after);
        return (T t) -> after.apply(apply(t));
    }
}