    001    // Copyright 2010 The Apache Software Foundation
    002    //
    003    // Licensed under the Apache License, Version 2.0 (the "License");
    004    // you may not use this file except in compliance with the License.
    005    // You may obtain a copy of the License at
    006    //
    007    // http://www.apache.org/licenses/LICENSE-2.0
    008    //
    009    // Unless required by applicable law or agreed to in writing, software
    010    // distributed under the License is distributed on an "AS IS" BASIS,
    011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    012    // See the License for the specific language governing permissions and
    013    // limitations under the License.
    014
    015    package org.apache.tapestry5.internal.services;
    016
    017    import org.apache.tapestry5.services.MethodInvocationResult;
    018
    019    /**
    020     * Implementation of {@link MethodInvocationResult} for failed
    021     * invocations (where a checked exception was thrown).
    022     *
    023     * @since 5.2.0
    024     */
    025    public class MethodInvocationFailResult implements MethodInvocationResult
    026    {
    027        private final Throwable thrown;
    028
    029        public MethodInvocationFailResult(Throwable thrown)
    030        {
    031            this.thrown = thrown;
    032        }
    033
    034        public Object getReturnValue()
    035        {
    036            return null;
    037        }
    038
    039        public <T extends Throwable> T getThrown(Class<T> throwableClass)
    040        {
    041            if (throwableClass.isInstance(thrown))
    042                return throwableClass.cast(thrown);
    043
    044            return null;
    045        }
    046
    047        public boolean isFail()
    048        {
    049            return true;
    050        }
    051
    052        public void rethrow()
    053        {
    054            throw new RuntimeException(thrown);
    055        }
    056    }