1 /*
2 * $Id$
3 *
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21 package org.apache.struts.dispatcher;
22
23 import java.io.Serializable;
24 import java.lang.reflect.Method;
25
26 import org.apache.struts.chain.contexts.ActionContext;
27
28 /**
29 * This interface defines a pluggable strategy for resolving a method and
30 * extracting its methods from an {@link ActionContext}. A {@link Dispatcher}
31 * may use the resolver to separate out its method resolution based on
32 * technology (such as servlets, portlets, etc.).
33 *
34 * @version $Rev$
35 * @since Struts 1.4
36 */
37 public interface MethodResolver extends Serializable{
38
39 /**
40 * Constructs the arguments that will be passed to the dispatched method.
41 *
42 * @param context the current action context
43 * @param method the target method of this dispatch
44 *
45 * @return the arguments array for the method, or <code>null</code> if the
46 * method does not match any supported signatures
47 * @see #resolveMethod(ActionContext, String)
48 */
49 Object[] buildArguments(ActionContext context, Method method);
50
51 /**
52 * Decides the appropriate method instance for the specified method name.
53 * Implementations may introspect for any desired method signature.
54 *
55 * @param context the current action context
56 * @param methodName the method name to use for introspection
57 * @return the method to invoke
58 * @throws NoSuchMethodException if an appropriate method cannot be found
59 */
60 Method resolveMethod(ActionContext context, String methodName) throws NoSuchMethodException;
61 }