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Java > Open Source Codes > org > springframework > web > servlet > view > BeanNameViewResolver


1 /*
2  * Copyright 2002-2006 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.web.servlet.view;
18
19 import java.util.Locale JavaDoc;
20
21 import org.springframework.beans.BeansException;
22 import org.springframework.context.ApplicationContext;
23 import org.springframework.core.Ordered;
24 import org.springframework.web.context.support.WebApplicationObjectSupport;
25 import org.springframework.web.servlet.View;
26 import org.springframework.web.servlet.ViewResolver;
27
28 /**
29  * Simple implementation of ViewResolver that interprets a view name
30  * as bean name in the current application context, i.e. in the XML
31  * file of the executing DispatcherServlet.
32  *
33  * <p>This resolver can be handy for small applications, keeping all
34  * definitions ranging from controllers to views in the same place.
35  * For normal applications, XmlViewResolver will be the better choice, as
36  * it separates the XML view bean definitions into a dedicated views file.
37  * View beans should virtually never have references to any other
38  * application beans - such a separation will make this clear.
39  *
40  * <p>This ViewResolver does not support internationalization.
41  * Conside ResourceBundleViewResolver if you need to apply different
42  * view resources per locale.
43  *
44  * <p>Note: This ViewResolver implements the Ordered interface to allow for
45  * flexible participation in ViewResolver chaining. For example, some special
46  * views could be defined via this ViewResolver (giving it 0 as "order" value),
47  * while all remaining views could be resolved by a UrlBasedViewResolver.
48  *
49  * @author Juergen Hoeller
50  * @since 18.06.2003
51  * @see XmlViewResolver
52  * @see ResourceBundleViewResolver
53  * @see UrlBasedViewResolver
54  */
55 public class BeanNameViewResolver extends WebApplicationObjectSupport implements ViewResolver, Ordered {
56
57     private int order = Integer.MAX_VALUE; // default: same as non-Ordered
58
59
60     public void setOrder(int order) {
61         this.order = order;
62     }
63
64     public int getOrder() {
65         return order;
66     }
67
68
69     public View resolveViewName(String JavaDoc viewName, Locale JavaDoc locale) throws BeansException {
70         ApplicationContext context = getApplicationContext();
71         if (!context.containsBean(viewName)) {
72             // Allow for ViewResolver chaining.
73 return null;
74         }
75         return (View) context.getBean(viewName, View.class);
76     }
77
78 }
79
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