    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one or more
    003 * contributor license agreements.  See the NOTICE file distributed with
    004 * this work for additional information regarding copyright ownership.
    005 * The ASF licenses this file to You under the Apache License, Version 2.0
    006 * (the "License"); you may not use this file except in compliance with
    007 * the License.  You may obtain a copy of the License at
    008 *
    009 *      http://www.apache.org/licenses/LICENSE-2.0
    010 *
    011 * Unless required by applicable law or agreed to in writing, software
    012 * distributed under the License is distributed on an "AS IS" BASIS,
    013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014 * See the License for the specific language governing permissions and
    015 * limitations under the License.
    016 */
    017package org.apache.commons.io.function;
    018
    019import java.io.IOException;
    020
    021/**
    022 * Erases {@link IOException} for the compiler but still throws that exception at runtime.
    023 *
    024 * @since 2.16.0
    025 */
    026public final class Erase {
    027
    028    /**
    029     * Delegates to the given {@link IOBiConsumer} but erases its {@link IOException} for the compiler, while still throwing
    030     * the exception at runtime.
    031     *
    032     * @param <T> See delegate.
    033     * @param <U> See delegate.
    034     * @param consumer See delegate.
    035     * @param t See delegate.
    036     * @param u See delegate.
    037     * @see IOBiConsumer
    038     */
    039    static <T, U> void accept(final IOBiConsumer<T, U> consumer, final T t, final U u) {
    040        try {
    041            consumer.accept(t, u);
    042        } catch (final IOException ex) {
    043            rethrow(ex); // throws IOException
    044        }
    045    }
    046
    047    /**
    048     * Delegates to the given {@link IOConsumer} but erases its {@link IOException} for the compiler, while still throwing
    049     * the exception at runtime.
    050     *
    051     * @param <T> See delegate.
    052     * @param consumer See delegate.
    053     * @param t See delegate.
    054     * @see IOConsumer
    055     */
    056    static <T> void accept(final IOConsumer<T> consumer, final T t) {
    057        try {
    058            consumer.accept(t);
    059        } catch (final IOException ex) {
    060            rethrow(ex); // throws IOException
    061        }
    062    }
    063
    064    /**
    065     * Delegates to the given {@link IOBiFunction} but erases its {@link IOException} for the compiler, while still throwing
    066     * the exception at runtime.
    067     *
    068     * @param <T> See delegate.
    069     * @param <U> See delegate.
    070     * @param <R> See delegate.
    071     * @param mapper See delegate.
    072     * @param t See delegate.
    073     * @param u See delegate.
    074     * @return See delegate.
    075     * @see IOBiFunction
    076     */
    077    static <T, U, R> R apply(final IOBiFunction<? super T, ? super U, ? extends R> mapper, final T t, final U u) {
    078        try {
    079            return mapper.apply(t, u);
    080        } catch (final IOException e) {
    081            throw rethrow(e); // throws IOException
    082        }
    083    }
    084
    085    /**
    086     * Delegates to the given {@link IOFunction} but erases its {@link IOException} for the compiler, while still throwing
    087     * the exception at runtime.
    088     *
    089     * @param <T> See delegate.
    090     * @param <R> See delegate.
    091     * @param mapper See delegate.
    092     * @param t See delegate.
    093     * @return See delegate.
    094     * @see IOFunction
    095     */
    096    static <T, R> R apply(final IOFunction<? super T, ? extends R> mapper, final T t) {
    097        try {
    098            return mapper.apply(t);
    099        } catch (final IOException e) {
    100            throw rethrow(e); // throws IOException
    101        }
    102    }
    103
    104    /**
    105     * Delegates to the given {@link IOComparator} but erases its {@link IOException} for the compiler, while still throwing
    106     * the exception at runtime.
    107     *
    108     * @param <T> See delegate.
    109     * @param comparator See delegate.
    110     * @param t See delegate.
    111     * @param u See delegate.
    112     * @return See delegate.
    113     * @see IOComparator
    114     */
    115    static <T> int compare(final IOComparator<? super T> comparator, final T t, final T u) {
    116        try {
    117            return comparator.compare(t, u);
    118        } catch (final IOException e) {
    119            throw rethrow(e); // throws IOException
    120        }
    121    }
    122
    123    /**
    124     * Delegates to the given {@link IOSupplier} but erases its {@link IOException} for the compiler, while still throwing
    125     * the exception at runtime.
    126     *
    127     * @param <T> See delegate.
    128     * @param supplier See delegate.
    129     * @return See delegate.
    130     * @see IOSupplier
    131     */
    132    static <T> T get(final IOSupplier<T> supplier) {
    133        try {
    134            return supplier.get();
    135        } catch (final IOException e) {
    136            throw rethrow(e); // throws IOException
    137        }
    138    }
    139
    140    /**
    141     * Throws the given throwable.
    142     *
    143     * @param <T> The throwable cast type.
    144     * @param throwable The throwable to rethrow.
    145     * @return nothing because we throw.
    146     * @throws T Always thrown.
    147     */
    148    @SuppressWarnings("unchecked")
    149    public static <T extends Throwable> RuntimeException rethrow(final Throwable throwable) throws T {
    150        throw (T) throwable;
    151    }
    152
    153    /**
    154     * Delegates to the given {@link IORunnable} but erases its {@link IOException} for the compiler, while still throwing
    155     * the exception at runtime.
    156     *
    157     * @param runnable See delegate.
    158     * @see IORunnable
    159     */
    160    static void run(final IORunnable runnable) {
    161        try {
    162            runnable.run();
    163        } catch (final IOException e) {
    164            throw rethrow(e); // throws IOException
    165        }
    166    }
    167
    168    /**
    169     * Delegates to the given {@link IOPredicate} but erases its {@link IOException} for the compiler, while still throwing
    170     * the exception at runtime.
    171     *
    172     * @param <T> See delegate.
    173     * @param predicate See delegate.
    174     * @param t See delegate.
    175     * @return See delegate.
    176     * @see IOPredicate
    177     */
    178    static <T> boolean test(final IOPredicate<? super T> predicate, final T t) {
    179        try {
    180            return predicate.test(t);
    181        } catch (final IOException e) {
    182            throw rethrow(e); // throws IOException
    183        }
    184    }
    185
    186    /** No instances. */
    187    private Erase() {
    188        // No instances.
    189    }
    190
    191}