1 /*
2 * Copyright 2002-2014 the original author or authors.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 package org.springframework.beans.factory.support;
18
19 import java.lang.reflect.Constructor;
20 import java.lang.reflect.Method;
21
22 import org.springframework.beans.BeansException;
23 import org.springframework.beans.factory.BeanFactory;
24
25 /**
26 * Interface responsible for creating instances corresponding to a root bean definition.
27 *
28 * <p>This is pulled out into a strategy as various approaches are possible,
29 * including using CGLIB to create subclasses on the fly to support Method Injection.
30 *
31 * @author Rod Johnson
32 * @author Juergen Hoeller
33 * @since 1.1
34 */
35 public interface InstantiationStrategy {
36
37 /**
38 * Return an instance of the bean with the given name in this factory.
39 * @param bd the bean definition
40 * @param beanName the name of the bean when it's created in this context.
41 * The name can be {@code null} if we're autowiring a bean which doesn't
42 * belong to the factory.
43 * @param owner the owning BeanFactory
44 * @return a bean instance for this bean definition
45 * @throws BeansException if the instantiation attempt failed
46 */
47 Object instantiate(RootBeanDefinition bd, String beanName, BeanFactory owner)
48 throws BeansException;
49
50 /**
51 * Return an instance of the bean with the given name in this factory,
52 * creating it via the given constructor.
53 * @param bd the bean definition
54 * @param beanName the name of the bean when it's created in this context.
55 * The name can be {@code null} if we're autowiring a bean which doesn't
56 * belong to the factory.
57 * @param owner the owning BeanFactory
58 * @param ctor the constructor to use
59 * @param args the constructor arguments to apply
60 * @return a bean instance for this bean definition
61 * @throws BeansException if the instantiation attempt failed
62 */
63 Object instantiate(RootBeanDefinition bd, String beanName, BeanFactory owner,
64 Constructor<?> ctor, Object... args) throws BeansException;
65
66 /**
67 * Return an instance of the bean with the given name in this factory,
68 * creating it via the given factory method.
69 * @param bd the bean definition
70 * @param beanName the name of the bean when it's created in this context.
71 * The name can be {@code null} if we're autowiring a bean which doesn't
72 * belong to the factory.
73 * @param owner the owning BeanFactory
74 * @param factoryBean the factory bean instance to call the factory method on,
75 * or {@code null} in case of a static factory method
76 * @param factoryMethod the factory method to use
77 * @param args the factory method arguments to apply
78 * @return a bean instance for this bean definition
79 * @throws BeansException if the instantiation attempt failed
80 */
81 Object instantiate(RootBeanDefinition bd, String beanName, BeanFactory owner,
82 Object factoryBean, Method factoryMethod, Object... args) throws BeansException;
83
84 }