monasca.common.util.Exceptions.java Source code

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Here is the source code for monasca.common.util.Exceptions.java

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/*
 * Copyright (c) 2014 Hewlett-Packard Development Company, L.P.
 *
 * 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 monasca.common.util;

import com.google.common.base.Preconditions;

/**
 * Utilities for working with exceptions.
 */
public final class Exceptions {
    /**
     * A marker exception class that we look for in order to unwrap the exception into the user
     * exception, to provide a cleaner stack trace.
     */
    @SuppressWarnings("serial")
    private static class UnhandledCheckedUserException extends RuntimeException {
        public UnhandledCheckedUserException(Exception ex, String msg, Object... args) {
            super(String.format(msg, args), ex);
        }

        public UnhandledCheckedUserException(Throwable cause) {
            super(cause);
        }
    }

    private Exceptions() {
    }

    /** Throw <b>any</b> exception as a RuntimeException. */
    public static RuntimeException sneakyThrow(Throwable throwable) {
        Preconditions.checkNotNull(throwable, "throwable");
        Exceptions.<RuntimeException>sneakyThrow0(throwable);
        return null;
    }

    /**
     * Throws a new unchecked exception wrapping the {@code cause}.
     * 
     * @throws RuntimeException wrapping the {@code cause}
     */
    public static void throwUnchecked(Throwable cause) {
        throw new UnhandledCheckedUserException(cause);
    }

    /** Returns a new unchecked exception wrapping the {@code cause}. */
    public static RuntimeException uncheck(Exception ex, String msg, Object... args) {
        return new UnhandledCheckedUserException(ex, msg, args);
    }

    /** Returns a new unchecked exception wrapping the {@code cause}. */
    public static RuntimeException uncheck(Throwable cause) {
        return new UnhandledCheckedUserException(cause);
    }

    @SuppressWarnings("unchecked")
    private static <T extends Throwable> void sneakyThrow0(Throwable t) throws T {
        throw (T) t;
    }
}