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