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/*
 *  Copyright 2008 biaoping.yin
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.frameworkset.web.servlet.support;

import org.frameworkset.util.MethodParameter;
import org.frameworkset.web.servlet.mvc.NativeWebRequest;

/**
 * 

Title: WebArgumentResolver.java

*

Description: SPI for resolving custom arguments for a specific handler method parameter. * Typically implemented to detect sppecial parameter types, resolving * well-known argument values for them. * *

A typical implementation could look like as follows: * *

 * public class MySpecialArgumentResolver implements ArgumentResolver {
 *
 *   public Object resolveArgument(MethodParameter methodParameter, NativeWebRequest webRequest) {
 *     if (methodParameter.getParameterType().equals(MySpecialArg.class)) {
 *       return new MySpecialArg("myValue");
 *     }
 *     return UNRESOLVED;
 *   }
 * }
*

*

bboss workgroup

*

Copyright (c) 2008

* @Date 2010-10-24 * @author biaoping.yin * @version 1.0 */ public interface WebArgumentResolver { /** * Marker to be returned when the resolver does not know how to * handle the given method parameter. */ Object UNRESOLVED = new Object(); /** * Resolve an argument for the given handler method parameter within the given web request. * @param methodParameter the handler method parameter to resolve * @param webRequest the current web request, allowing access to the native request as well * @return the argument value, or UNRESOLVED if not resolvable * @throws Exception in case of resolution failure */ Object resolveArgument(MethodParameter methodParameter, NativeWebRequest webRequest) throws Exception; }




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