1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 package org.apache.commons.proxy.provider; 19 20 import org.apache.commons.proxy.ObjectProvider; 21 import org.apache.commons.proxy.exception.ObjectProviderException; 22 23 /** 24 * Uses <code>Class.newInstance()</code> to instantiate an object. 25 * 26 * @author James Carman 27 * @since 1.0 28 */ 29 public class BeanProvider implements ObjectProvider 30 { 31 //---------------------------------------------------------------------------------------------------------------------- 32 // Fields 33 //---------------------------------------------------------------------------------------------------------------------- 34 35 private Class beanClass; 36 37 //---------------------------------------------------------------------------------------------------------------------- 38 // Constructors 39 //---------------------------------------------------------------------------------------------------------------------- 40 41 public BeanProvider() 42 { 43 } 44 45 /** 46 * Constructs a provider which instantiates objects of the specified bean class. 47 * @param beanClass the bean class 48 */ 49 public BeanProvider( Class beanClass ) 50 { 51 this.beanClass = beanClass; 52 } 53 54 //---------------------------------------------------------------------------------------------------------------------- 55 // ObjectProvider Implementation 56 //---------------------------------------------------------------------------------------------------------------------- 57 58 public Object getObject() 59 { 60 try 61 { 62 if( beanClass == null ) 63 { 64 throw new ObjectProviderException( "No bean class provided." ); 65 } 66 return beanClass.newInstance(); 67 } 68 catch( InstantiationException e ) 69 { 70 throw new ObjectProviderException( "Class " + beanClass.getName() + " is not concrete.", e ); 71 } 72 catch( IllegalAccessException e ) 73 { 74 throw new ObjectProviderException( "Constructor for class " + beanClass.getName() + " is not accessible.", 75 e ); 76 } 77 } 78 79 //---------------------------------------------------------------------------------------------------------------------- 80 // Getter/Setter Methods 81 //---------------------------------------------------------------------------------------------------------------------- 82 83 public void setBeanClass( Class beanClass ) 84 { 85 this.beanClass = beanClass; 86 } 87 } 88