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 015package org.apache.tapestry5.ioc.internal.util; 016 017import org.apache.tapestry5.ioc.Invokable; 018import org.apache.tapestry5.ioc.ObjectCreator; 019 020import java.lang.reflect.Constructor; 021import java.lang.reflect.InvocationTargetException; 022 023/** 024 * Wraps the invocation of a constructor (with exception reporting) as an {@link Invokable}. 025 * 026 * @since 5.3 027 */ 028public class ConstructorInvoker<T> implements Invokable<T> 029{ 030 private final Constructor<T> constructor; 031 032 private final ObjectCreator[] constructorParameters; 033 034 public ConstructorInvoker(Constructor constructor, ObjectCreator[] constructorParameters) 035 { 036 this.constructor = constructor; 037 this.constructorParameters = constructorParameters; 038 } 039 040 public T invoke() 041 { 042 Throwable fail; 043 044 Object[] realized = InternalUtils.realizeObjects(constructorParameters); 045 046 try 047 { 048 return constructor.newInstance(realized); 049 } catch (InvocationTargetException ex) 050 { 051 fail = ex.getTargetException(); 052 } catch (Exception ex) 053 { 054 fail = ex; 055 } 056 057 throw new RuntimeException(String.format("Error invoking constructor %s: %s", 058 constructor, InternalUtils.toMessage(fail)), fail); 059 } 060}