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