Exceptions.java

/*
 * Copyright (c) 2014 the original author or authors
 *
 * 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 io.werval.runtime.util;

/**
 * Exceptions utility methods.
 */
// TODO Add utility methods taking closures
public final class Exceptions
{
    /**
     * A version of "sneaky throw" to relay exceptions.
     *
     * @param ex any throwable
     */
    public static void rethrow( Throwable ex )
    {
        if( ex != null )
        {
            Exceptions.<RuntimeException>uncheckedThrow( ex );
        }
    }

    /**
     * The sneaky part of sneaky throw, relying on generics
     * limitations to evade compiler complaints about rethrowing
     * checked exceptions
     */
    @SuppressWarnings( "unchecked" )
    private static <T extends Throwable> void uncheckedThrow( Throwable t )
        throws T
    {
        // rely on vacuous cast
        throw (T) t;
    }

    private Exceptions()
    {
    }
}