ParameterNameDiscoverer


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.core;
18  
19  import java.lang.reflect.Constructor  ;
20  import java.lang.reflect.Method  ;
21  
22  /**
23   * Interface to discover parameter names for methods and constructors.
24   *
25   * <p>Parameter name discovery is not always possible, but various strategies are
26   * available to try, such as looking for debug information that may have been
27   * emitted at compile time, and looking for argname annotation values optionally
28   * accompanying AspectJ annotated methods.
29   *
30   * @author Rod Johnson
31   * @author Adrian Colyer
32   * @since 2.0
33   */
34  public interface ParameterNameDiscoverer {
35      
36      /**
37       * Return parameter names for this method,
38       * or <code>null</code> if they cannot be determined.
39       * @param method method to find parameter names for
40       * @return an array of parameter names if the names can be resolved,
41       * or <code>null</code> if they cannot
42       */
43      String  [] getParameterNames(Method   method);
44      
45      /**
46       * Return parameter names for this constructor,
47       * or <code>null</code> if they cannot be determined.
48       * @param ctor constructor to find parameter names for
49       * @return an array of parameter names if the names can be resolved,
50       * or <code>null</code> if they cannot
51       */
52      String  [] getParameterNames(Constructor   ctor);
53  
54  }
55
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