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Java Source Code / Java Documentation » Library » Apache commons configuration 1.4 src » org.apache.commons.configuration.beanutils 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*
02:         * Licensed to the Apache Software Foundation (ASF) under one or more
03:         * contributor license agreements.  See the NOTICE file distributed with
04:         * this work for additional information regarding copyright ownership.
05:         * The ASF licenses this file to You under the Apache License, Version 2.0
06:         * (the "License"); you may not use this file except in compliance with
07:         * the License.  You may obtain a copy of the License at
08:         *
09:         *     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:        package org.apache.commons.configuration.beanutils;
18:
19:        /**
20:         * <p>
21:         * Definition of an interface for bean factories.
22:         * </p>
23:         * <p>
24:         * Beans defined in configuration files are not directly created, but by so
25:         * called <em>bean factories</em>. This additional level of indirection
26:         * provides for high flexibility in the creation process. For instance one
27:         * implementation of this interface could be very simple and create a new
28:         * instance of the specified class for each invocation. A different
29:         * implementation could cache already created beans and ensure that always the
30:         * same bean of the given class will be returned - this would be an easy mean
31:         * for creating singleton objects.
32:         * </p>
33:         * <p>
34:         * The interface itself is quite simple. There is a single method for creating a
35:         * bean of a given class. All necessary parameters are obtained from an also
36:         * passed in <code>{@link BeanDeclaration}</code> object. It is also possible
37:         * (but optional) for a bean factory to declare the default class of the bean it
38:         * creates. Then it is not necessary to specify a bean class in the bean
39:         * declaration.
40:         * </p>
41:         *
42:         * @since 1.3
43:         * @author Oliver Heger
44:         * @version $Id: BeanFactory.java 439648 2006-09-02 20:42:10Z oheger $
45:         */
46:        public interface BeanFactory {
47:            /**
48:             * Returns a bean instance for the given class. The bean will be initialized
49:             * from the specified bean declaration object. It is up to a concrete
50:             * implementation how the bean will be created and initialized.
51:             *
52:             * @param beanClass the class for the bean
53:             * @param data the bean declaration object containing all data about the
54:             * bean to be created
55:             * @param param an additional parameter that may be passed by calling code;
56:             * it is up to a concrete implementation how this parameter is evaluated
57:             * @return the new bean instance (should not be <b>null</b>)
58:             * @throws Exception if an error occurs (the helper classes for creating
59:             * beans will catch this unspecific exception and wrap it in a configuration
60:             * exception)
61:             */
62:            Object createBean(Class beanClass, BeanDeclaration data,
63:                    Object param) throws Exception;
64:
65:            /**
66:             * Returns the default bean class of this bean factory. If an implementation
67:             * here returns a non <b>null</b> value, bean declarations using this
68:             * factory do not need to provide the name of the bean class. In such a case
69:             * an instance of the default class will be created.
70:             *
71:             * @return the default class of this factory or <b>null</b> if there is
72:             * none
73:             */
74:            Class getDefaultBeanClass();
75:        }
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