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}