MethodNameResolver


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.mvc.multiaction;
18  
19  import javax.servlet.http.HttpServletRequest  ;
20  
21  /**
22   * Interface that parameterizes the MultiActionController class
23   * using the <b>Strategy</b> GoF Design pattern, allowing
24   * the mapping from incoming request to handler method name
25   * to be varied without affecting other application code.
26   *
27   * <p>Illustrates how delegation can be more flexible than subclassing.
28   *
29   * @author Rod Johnson
30   * @see MultiActionController#setMethodNameResolver
31   */
32  public interface MethodNameResolver {
33      
34      /**
35       * Return a method name that can handle this request. Such
36       * mappings are typically, but not necessarily, based on URL.
37       * @param request current HTTP request
38       * @return a method name that can handle this request.
39       * Never returns <code>null</code>; throws exception if not resolvable.
40       * @throws NoSuchRequestHandlingMethodException if no handler method
41       * can be found for the given request
42       */
43      String   getHandlerMethodName(HttpServletRequest   request) throws NoSuchRequestHandlingMethodException;
44  
45  }
46

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