ExceptionUtils.java

/*
 * Copyright 2015 Petr Bouda
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.joyrest.utils;

import java.util.function.Consumer;
import java.util.function.Function;
import java.util.function.Supplier;

public final class ExceptionUtils {

    public static <T> Consumer<T> rethrowConsumer(Consumer_WithExceptions<T> consumer) {
        return t -> {
            try {
                consumer.accept(t);
            } catch (Exception exception) {
                throwAsUnchecked(exception);
            }
        };
    }

    public static <T, R> Function<T, R> rethrowFuction(Function_WithExceptions<T, R> function) {
        return t -> {
            try {
                return function.apply(t);
            } catch (Exception exception) {
                throwAsUnchecked(exception);
                return null;
            }
        };
    }

    public static <T> Supplier<T> rethrow(Supplier_WithExceptions<T> function) {
        return () -> {
            try {
                return function.get();
            } catch (Exception exception) {
                throwAsUnchecked(exception);
                return null;
            }
        };
    }

    public static void uncheck(Runnable_WithExceptions t) {
        try {
            t.accept();
        } catch (Exception exception) {
            throwAsUnchecked(exception);
        }
    }

    public static <R> R uncheck(Supplier_WithExceptions<R> supplier) {
        try {
            return supplier.get();
        } catch (Exception exception) {
            throwAsUnchecked(exception);
            return null;
        }
    }

    public static <T, R> R uncheck(Function_WithExceptions<T, R> function, T t) {
        try {
            return function.apply(t);
        } catch (Exception exception) {
            throwAsUnchecked(exception);
            return null;
        }
    }

    @SuppressWarnings("unchecked")
    private static <E extends Throwable> void throwAsUnchecked(Exception exception) throws E {
        throw (E) exception;
    }

    @FunctionalInterface
    public interface Consumer_WithExceptions<T> {

        void accept(T t) throws Exception;
    }

    @FunctionalInterface
    public interface Function_WithExceptions<T, R> {

        R apply(T t) throws Exception;
    }

    @FunctionalInterface
    public interface Supplier_WithExceptions<T> {

        T get() throws Exception;
    }

    @FunctionalInterface
    public interface Runnable_WithExceptions {

        void accept() throws Exception;
    }
}