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    }