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Functional ADT And Asynchronous library in Java

There is a newer version: 0.11.0

/*
 * HPAS
 * https://github.com/d-plaindoux/hpas
 *
 * Copyright (c) 2016 Didier Plaindoux
 * Licensed under the LGPL2 license.
 */

package org.smallibs.concurrent.promise.impl;

import org.smallibs.data.Try;

import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java.util.function.Function;

class MappedFuture implements Future {

    private final Future future;
    private final Function> function;

    MappedFuture(Future future, Function> function) {
        this.future = future;
        this.function = function;
    }

    @Override
    public boolean cancel(boolean mayInterruptIfRunning) {
        return this.future.cancel(mayInterruptIfRunning);
    }

    @Override
    public boolean isCancelled() {
        return this.future.isCancelled();
    }

    @Override
    public boolean isDone() {
        return this.future.isDone();
    }

    @Override
    public R get() throws InterruptedException, ExecutionException {
        try {
            return  this.function.apply(this.future.get()).orElseThrow();
        } catch (Throwable throwable) {
            throw new ExecutionException(throwable);
        }
    }

    @Override
    public R get(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException {
        try {
            return this.function.apply(this.future.get(timeout, unit)).orElseThrow();
        } catch (Throwable throwable) {
            throw new ExecutionException(throwable);
        }
    }
}