1 /*

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

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

     4  *

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

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

     7  * published by the Free Software Foundation.

     8  *

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

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

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

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

    13  * accompanied this code).

    14  *

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

    16  * 2 along with this work; if not, write to the Free Software Foundation,

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

    18  *

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

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

    21  * questions.

    22  */

    23 package jdk.jpackage.test;

    24 

    25 import java.lang.reflect.InvocationTargetException;

    26 import java.util.Optional;

    27 import java.util.function.Consumer;

    28 import java.util.function.Function;

    29 import java.util.function.Supplier;

    30 

    31 

    32 public class Functional {

    33     @FunctionalInterface

    34     public interface ThrowingConsumer<T> {

    35         void accept(T t) throws Throwable;

    36 

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

    38             return o -> {

    39                 try {

    40                     v.accept(o);

    41                 } catch (Throwable ex) {

    42                     rethrowUnchecked(ex);

    43                 }

    44             };

    45         }

    46     }

    47 

    48     @FunctionalInterface

    49     public interface ThrowingSupplier<T> {

    50         T get() throws Throwable;

    51 

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

    53             return () -> {

    54                 try {

    55                     return v.get();

    56                 } catch (Throwable ex) {

    57                     rethrowUnchecked(ex);

    58                 }

    59                 // Unreachable

    60                 return null;

    61             };

    62         }

    63     }

    64 

    65     @FunctionalInterface

    66     public interface ThrowingFunction<T, R> {

    67         R apply(T t) throws Throwable;

    68 

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

    70             return (t) -> {

    71                 try {

    72                     return v.apply(t);

    73                 } catch (Throwable ex) {

    74                     rethrowUnchecked(ex);

    75                 }

    76                 // Unreachable

    77                 return null;

    78             };

    79         }

    80     }

    81 

    82     @FunctionalInterface

    83     public interface ThrowingRunnable {

    84         void run() throws Throwable;

    85 

    86         public static Runnable toRunnable(ThrowingRunnable v) {

    87             return () -> {

    88                 try {

    89                     v.run();

    90                 } catch (Throwable ex) {

    91                     rethrowUnchecked(ex);

    92                 }

    93             };

    94         }

    95     }

    96 

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

    98         return v;

    99     }

   100 

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

   102         return v;

   103     }

   104 

   105     public static Runnable identity(Runnable v) {

   106         return v;

   107     }

   108 

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

   110         return v;

   111     }

   112 

   113     public static class ExceptionBox extends RuntimeException {

   114         public ExceptionBox(Throwable throwable) {

   115             super(throwable);

   116         }

   117     }

   118 

   119     @SuppressWarnings("unchecked")

   120     public static void rethrowUnchecked(Throwable throwable) throws ExceptionBox {

   121         if (throwable instanceof ExceptionBox) {

   122             throw (ExceptionBox)throwable;

   123         }

   124 

   125         if (throwable instanceof InvocationTargetException) {

   126             new ExceptionBox(throwable.getCause());

   127         }

   128 

   129         throw new ExceptionBox(throwable);

   130     }

   131 }