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A lightweight, zero-dependency implementation of the AWS V4 signing algorithm

There is a newer version: 1.3

/*
  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.

  Copyright 2016 the original author or authors.
 */
package uk.co.lucasweb.aws.v4.signer.functional;

/**
 * Invokes a function wrapping any checked exceptions thrown by the function in an unchecked exception.
 *
 * @author Richard Lucas
 */
public final class Throwables {

    private Throwables() {
        // hide default constructor
    }

    @FunctionalInterface
    public interface ExceptionWrapper {
        E wrap(Exception e);
    }

    @FunctionalInterface
    public interface ReturnableInstance {
        R apply() throws Exception;
    }

    @FunctionalInterface
    public interface VoidInstance {
        void apply() throws Exception;
    }

    public static  void voidInstance(VoidInstance voidInstance, ExceptionWrapper wrapper) throws E {
        try {
            voidInstance.apply();
        } catch (Exception e) {
            throw wrapper.wrap(e);
        }
    }

    public static  R returnableInstance(ReturnableInstance returnableInstance, ExceptionWrapper wrapper) throws E {
        try {
            return returnableInstance.apply();
        } catch (Exception e) {
            throw wrapper.wrap(e);
        }
    }


}