001 /*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017
018 package org.apache.commons.proxy.provider;
019
020 import org.apache.commons.proxy.ObjectProvider;
021 import org.apache.commons.proxy.exception.ObjectProviderException;
022
023 /**
024 * Uses <code>Class.newInstance()</code> to instantiate an object.
025 *
026 * @author James Carman
027 * @since 1.0
028 */
029 public class BeanProvider implements ObjectProvider
030 {
031 //----------------------------------------------------------------------------------------------------------------------
032 // Fields
033 //----------------------------------------------------------------------------------------------------------------------
034
035 private Class beanClass;
036
037 //----------------------------------------------------------------------------------------------------------------------
038 // Constructors
039 //----------------------------------------------------------------------------------------------------------------------
040
041 public BeanProvider()
042 {
043 }
044
045 /**
046 * Constructs a provider which instantiates objects of the specified bean class.
047 * @param beanClass the bean class
048 */
049 public BeanProvider( Class beanClass )
050 {
051 this.beanClass = beanClass;
052 }
053
054 //----------------------------------------------------------------------------------------------------------------------
055 // ObjectProvider Implementation
056 //----------------------------------------------------------------------------------------------------------------------
057
058 public Object getObject()
059 {
060 try
061 {
062 if( beanClass == null )
063 {
064 throw new ObjectProviderException( "No bean class provided." );
065 }
066 return beanClass.newInstance();
067 }
068 catch( InstantiationException e )
069 {
070 throw new ObjectProviderException( "Class " + beanClass.getName() + " is not concrete.", e );
071 }
072 catch( IllegalAccessException e )
073 {
074 throw new ObjectProviderException( "Constructor for class " + beanClass.getName() + " is not accessible.",
075 e );
076 }
077 }
078
079 //----------------------------------------------------------------------------------------------------------------------
080 // Getter/Setter Methods
081 //----------------------------------------------------------------------------------------------------------------------
082
083 public void setBeanClass( Class beanClass )
084 {
085 this.beanClass = beanClass;
086 }
087 }
088