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
016package org.apache.tapestry5.ioc.internal.util;
017
018import org.apache.tapestry5.ioc.Invokable;
019import org.apache.tapestry5.ioc.ObjectCreator;
020
021import java.lang.reflect.InvocationTargetException;
022import java.lang.reflect.Method;
023
024/**
025 * @since 5.3
026 */
027public 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}