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.proxy2.provider;
19
20 import java.io.Serializable;
21
22 import org.apache.commons.lang3.Validate;
23 import org.apache.commons.proxy2.ObjectProvider;
24 import org.apache.commons.proxy2.exception.ObjectProviderException;
25
26 /**
27 * Uses <code>Class.newInstance()</code> to instantiate an object.
28 *
29 * @since 1.0
30 */
31 public class BeanProvider<T> implements ObjectProvider<T>, Serializable
32 {
33 /** Serialization version */
34 private static final long serialVersionUID = 1L;
35
36 //******************************************************************************************************************
37 // Fields
38 //******************************************************************************************************************
39
40 private final Class<? extends T> beanClass;
41
42 //******************************************************************************************************************
43 // Constructors
44 //******************************************************************************************************************
45
46 /**
47 * Constructs a provider which instantiates objects of the specified bean class.
48 *
49 * @param beanClass
50 * the bean class
51 */
52 public BeanProvider(Class<? extends T> beanClass)
53 {
54 Validate.notNull(beanClass, "Bean class cannot be null.");
55 this.beanClass = beanClass;
56 }
57
58 //******************************************************************************************************************
59 // ObjectProvider Implementation
60 //******************************************************************************************************************
61
62 /**
63 * {@inheritDoc}
64 */
65 @Override
66 public T getObject()
67 {
68 try
69 {
70 return beanClass.newInstance();
71 }
72 catch (InstantiationException e)
73 {
74 throw new ObjectProviderException(e, "%s is not concrete.", beanClass);
75 }
76 catch (IllegalAccessException e)
77 {
78 throw new ObjectProviderException(e, "Constructor for %s is not accessible.", beanClass);
79 }
80 }
81 }