    001// Copyright 2011-2013 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
    016package org.apache.tapestry5.ioc.internal.util;
    017
    018import org.apache.tapestry5.ioc.Invokable;
    019import org.apache.tapestry5.ioc.ObjectCreator;
    020import org.apache.tapestry5.ioc.util.ExceptionUtils;
    021
    022import java.lang.reflect.InvocationTargetException;
    023import java.lang.reflect.Method;
    024
    025/**
    026 * @since 5.3
    027 */
    028public class MethodInvoker<T> implements Invokable<T>
    029{
    030    private final Object instance;
    031
    032    private final Method method;
    033
    034    private final ObjectCreator[] methodParameters;
    035
    036    public MethodInvoker(Object instance, Method method, ObjectCreator[] methodParameters)
    037    {
    038        this.instance = instance;
    039        this.method = method;
    040        this.methodParameters = methodParameters;
    041    }
    042
    043    @Override
    044    public T invoke()
    045    {
    046        Throwable fail;
    047
    048        Object[] realized = InternalUtils.realizeObjects(methodParameters);
    049
    050        try
    051        {
    052            Object result = method.invoke(instance, realized);
    053
    054            return (T) result;
    055        } catch (InvocationTargetException ex)
    056        {
    057            fail = ex.getTargetException();
    058        } catch (Exception ex)
    059        {
    060            fail = ex;
    061        }
    062
    063        throw new RuntimeException(String.format("Error invoking method %s: %s",
    064                method, ExceptionUtils.toMessage(fail)), fail);
    065    }
    066}