/*

 * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package jdk.jpackage.test;

import java.lang.reflect.InvocationTargetException;

import java.util.function.Consumer;

import java.util.function.Function;

import java.util.function.Predicate;

import java.util.function.Supplier;

public class Functional {

    @FunctionalInterface

    public interface ThrowingConsumer<T> {

        void accept(T t) throws Throwable;

        public static <T> Consumer<T> toConsumer(ThrowingConsumer<T> v) {

            return o -> {

                try {

                    v.accept(o);

                } catch (Throwable ex) {

                    rethrowUnchecked(ex);

                }

            };

        }

    }

    @FunctionalInterface

    public interface ThrowingSupplier<T> {

        T get() throws Throwable;

        public static <T> Supplier<T> toSupplier(ThrowingSupplier<T> v) {

            return () -> {

                try {

                    return v.get();

                } catch (Throwable ex) {

                    rethrowUnchecked(ex);

                }

                // Unreachable

                return null;

            };

        }

    }

    @FunctionalInterface

    public interface ThrowingFunction<T, R> {

        R apply(T t) throws Throwable;

        public static <T, R> Function<T, R> toFunction(ThrowingFunction<T, R> v) {

            return (t) -> {

                try {

                    return v.apply(t);

                } catch (Throwable ex) {

                    rethrowUnchecked(ex);

                }

                // Unreachable

                return null;

            };

        }

    }

    @FunctionalInterface

    public interface ThrowingRunnable {

        void run() throws Throwable;

        public static Runnable toRunnable(ThrowingRunnable v) {

            return () -> {

                try {

                    v.run();

                } catch (Throwable ex) {

                    rethrowUnchecked(ex);

                }

            };

        }

    }

    public static <T> Supplier<T> identity(Supplier<T> v) {

        return v;

    }

    public static <T> Consumer<T> identity(Consumer<T> v) {

        return v;

    }

    public static Runnable identity(Runnable v) {

        return v;

    }

    public static <T, R> Function<T, R> identity(Function<T, R> v) {

        return v;

    }

    public static <T, R> Function<T, R> identityFunction(Function<T, R> v) {

        return v;

    }

    public static <T> Predicate<T> identity(Predicate<T> v) {

        return v;

    }

    public static <T> Predicate<T> identityPredicate(Predicate<T> v) {

        return v;

    }

    public static class ExceptionBox extends RuntimeException {

        public ExceptionBox(Throwable throwable) {

            super(throwable);

        }

    }

    @SuppressWarnings("unchecked")

    public static void rethrowUnchecked(Throwable throwable) throws ExceptionBox {

        if (throwable instanceof ExceptionBox) {

            throw (ExceptionBox)throwable;

        }

        if (throwable instanceof InvocationTargetException) {

            new ExceptionBox(throwable.getCause());

        }

        throw new ExceptionBox(throwable);

    }

}