    001    // Copyright 2011 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
    016    package org.apache.tapestry5.ioc.internal.util;
    017
    018    import org.apache.tapestry5.ioc.Invokable;
    019    import org.apache.tapestry5.ioc.ObjectCreator;
    020
    021    import java.lang.reflect.InvocationTargetException;
    022    import java.lang.reflect.Method;
    023
    024    /**
    025     * @since 5.3
    026     */
    027    public class MethodInvoker<T> implements Invokable<T>
    028    {
    029        private final Object instance;
    030
    031        private final Method method;
    032
    033        private final ObjectCreator[] methodParameters;
    034
    035        public MethodInvoker(Object instance, Method method, ObjectCreator[] methodParameters)
    036        {
    037            this.instance = instance;
    038            this.method = method;
    039            this.methodParameters = methodParameters;
    040        }
    041
    042        public T invoke()
    043        {
    044            Throwable fail;
    045
    046            Object[] realized = InternalUtils.realizeObjects(methodParameters);
    047
    048            try
    049            {
    050                Object result = method.invoke(instance, realized);
    051
    052                return (T) result;
    053            } catch (InvocationTargetException ex)
    054            {
    055                fail = ex.getTargetException();
    056            } catch (Exception ex)
    057            {
    058                fail = ex;
    059            }
    060
    061            throw new RuntimeException(String.format("Error invoking method %s: %s",
    062                    method, InternalUtils.toMessage(fail)), fail);
    063        }
    064    }