Source Code Cross Referenced for BeanDeclaration.java in  » Library » Apache-commons-configuration-1.4-src » org » apache » commons » configuration » beanutils » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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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:        import java.util.Map;
20:
21:        /**
22:         * <p>
23:         * Definition of an interface for declaring a bean in a configuration file.
24:         * </p>
25:         * <p>
26:         * Commons Configurations allows to define beans (i.e. simple Java objects) in
27:         * configuration files, which can be created at runtime. This is especially
28:         * useful if you program against interfaces and want to define the concrete
29:         * implementation class is a configuration file.
30:         * </p>
31:         * <p>
32:         * This interface defines methods for retrieving all information about a bean
33:         * that should be created from a configuration file, e.g. the bean's properties
34:         * or the factory to use for creating the instance. With different
35:         * implementations different &quot;layouts&quot; of bean declarations can be
36:         * supported. For instance if an XML configuration file is used, all features of
37:         * XML (e.g. attributes, nested elements) can be used to define the bean. In a
38:         * properties file the declaration format is more limited. The purpose of this
39:         * interface is to abstract from the concrete declaration format.
40:         * </p>
41:         *
42:         * @since 1.3
43:         * @author Oliver Heger
44:         * @version $Id: BeanDeclaration.java 439648 2006-09-02 20:42:10Z oheger $
45:         */
46:        public interface BeanDeclaration {
47:            /**
48:             * Returns the name of the <code>BeanFactory</code> that should be used
49:             * for creating the bean instance. This can be <b>null</b>, then a default
50:             * factory will be used.
51:             *
52:             * @return the name of the bean factory
53:             */
54:            String getBeanFactoryName();
55:
56:            /**
57:             * Here an arbitrary object can be returned that will be passed to the bean
58:             * factory. Its meaning is not further specified. The purpose of this
59:             * additional parameter is to support a further configuration of the bean
60:             * factory that can be placed directly at the bean declaration.
61:             *
62:             * @return a parameter for the bean factory
63:             */
64:            Object getBeanFactoryParameter();
65:
66:            /**
67:             * Returns the name of the bean class, from which an instance is to be
68:             * created. This value must be defined unless a default class is provided
69:             * for the bean creation operation.
70:             *
71:             * @return the name of the bean class
72:             */
73:            String getBeanClassName();
74:
75:            /**
76:             * Returns a map with properties that should be initialized on the newly
77:             * created bean. The map's keys are the names of the properties; the
78:             * corresponding values are the properties' values. The return value can be
79:             * <b>null</b> if no properties should be set.
80:             *
81:             * @return a map with properties to be initialized
82:             */
83:            Map getBeanProperties();
84:
85:            /**
86:             * Returns a map with declarations for beans that should be set as
87:             * properties of the newly created bean. This allows for complex
88:             * initialization szenarios: a bean for a bean that contains complex
89:             * properties (e.g. other beans) can have nested declarations for defining
90:             * these complex properties. The returned map's key are the names of the
91:             * properties to initialze. The values are <code>BeanDeclaration</code>
92:             * implementations. They will be treated like this declaration (in a
93:             * recursive manner), and the resulting beans are assigned to the
94:             * corresponding properties.
95:             *
96:             * @return a map with nested bean declarations
97:             */
98:            Map getNestedBeanDeclarations();
99:        }
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