Inspects the cause of the specified ExecutionException and creates a ConcurrentRuntimeException with the checked cause if necessary. - Java java.lang

Java examples for java.lang:Exception

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Description

Inspects the cause of the specified ExecutionException and creates a ConcurrentRuntimeException with the checked cause if necessary.

Demo Code

/*/*from  ww  w .  ja  v  a2 s .  c  om*/
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;

public class Main{
    /**
     * Inspects the cause of the specified {@code ExecutionException} and
     * creates a {@code ConcurrentRuntimeException} with the checked cause if
     * necessary. This method works exactly like
     * {@link #extractCause(ExecutionException)}. The only difference is that
     * the cause of the specified {@code ExecutionException} is extracted as a
     * runtime exception. This is an alternative for client code that does not
     * want to deal with checked exceptions.
     *
     * @param ex the exception to be processed
     * @return a {@code ConcurrentRuntimeException} with the checked cause
     */
    public static ConcurrentRuntimeException extractCauseUnchecked(
            final ExecutionException ex) {
        if (ex == null || ex.getCause() == null) {
            return null;
        }

        throwCause(ex);
        return new ConcurrentRuntimeException(ex.getMessage(),
                ex.getCause());
    }
    /**
     * Tests whether the cause of the specified {@code ExecutionException}
     * should be thrown and does it if necessary.
     *
     * @param ex the exception in question
     */
    private static void throwCause(final ExecutionException ex) {
        if (ex.getCause() instanceof RuntimeException) {
            throw (RuntimeException) ex.getCause();
        }

        if (ex.getCause() instanceof Error) {
            throw (Error) ex.getCause();
        }
    }
}

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