com.trenako.web.infrastructure.SearchRequestArgumentResolver.java Source code

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Here is the source code for com.trenako.web.infrastructure.SearchRequestArgumentResolver.java

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/*
 * Copyright 2012 the original author or authors.
 * 
 * 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 com.trenako.web.infrastructure;

import javax.servlet.http.HttpServletRequest;

import org.springframework.beans.PropertyValues;
import org.springframework.core.MethodParameter;
import org.springframework.web.bind.WebDataBinder;
import org.springframework.web.bind.support.WebDataBinderFactory;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.method.support.ModelAndViewContainer;

import com.trenako.criteria.SearchRequest;

/**
 * Resolves {@code SearchRequest} method arguments for controller actions.
 *
 * @author Carlo Micieli
 * @see com.trenako.criteria.SearchRequest
 */
public class SearchRequestArgumentResolver implements HandlerMethodArgumentResolver {

    private static final Object UNRESOLVED = new Object();

    /**
     * Creates a new {@code SearchRequestArgumentResolver}.
     */
    public SearchRequestArgumentResolver() {
    }

    @Override
    public Object resolveArgument(MethodParameter param, ModelAndViewContainer mavContainer,
            NativeWebRequest webRequest, WebDataBinderFactory binderFactory) throws Exception {

        if (param.getParameterType().equals(SearchRequest.class)) {
            SearchRequest searchRequest = new SearchRequest();

            WebDataBinder webBinder = binderFactory.createBinder(webRequest, searchRequest, "");

            HttpServletRequest request = (HttpServletRequest) webRequest.getNativeRequest();
            PropertyValues pvs = new ServletRequestPathVariablesPropertyValues(request);
            webBinder.bind(pvs);
            return searchRequest;
        }

        return UNRESOLVED;
    }

    @Override
    public boolean supportsParameter(MethodParameter par) {
        Class<?> paramType = par.getParameterType();
        return SearchRequest.class.isAssignableFrom(paramType);
    }
}