Struts example source code file (DWRValidator.java)

This example Struts source code file (DWRValidator.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Struts tags/keywords

actionproxy, actionproxyfactory, exception, exception, hashmap, http, map, map, object, object, request, response, servlet, string, util, validationaware, validationawaresupport, validationawaresupport, validatoractioninvocation

The Struts DWRValidator.java source code

/*
 * $Id: DWRValidator.java 803360 2009-08-12 03:59:51Z musachy $
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.struts2.validators;

import java.util.HashMap;
import java.util.Map;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts2.dispatcher.ApplicationMap;
import org.apache.struts2.dispatcher.Dispatcher;
import org.apache.struts2.dispatcher.RequestMap;
import org.apache.struts2.dispatcher.SessionMap;
import org.apache.struts2.dispatcher.mapper.ActionMapper;
import org.apache.struts2.dispatcher.mapper.ActionMapping;

import uk.ltd.getahead.dwr.WebContextFactory;

import com.opensymphony.xwork2.Action;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.ActionProxy;
import com.opensymphony.xwork2.ActionProxyFactory;
import com.opensymphony.xwork2.DefaultActionInvocation;
import com.opensymphony.xwork2.ValidationAware;
import com.opensymphony.xwork2.ValidationAwareSupport;
import com.opensymphony.xwork2.config.Configuration;
import com.opensymphony.xwork2.config.entities.ActionConfig;
import com.opensymphony.xwork2.config.entities.PackageConfig;
import com.opensymphony.xwork2.inject.Inject;
import com.opensymphony.xwork2.util.logging.Logger;
import com.opensymphony.xwork2.util.logging.LoggerFactory;

/**
 * <p/>
 * Use the dwr configuration as follows :-
 *
 * <pre>
 * <!-- START SNIPPET: dwrConfiguration -->
 *
 * <dwr>
 *    <allow>
 *      <create creator="new" javascript="validator" class="org.apache.struts2.validators.DWRValidator"/>
 *      <convert converter="bean" match="com.opensymphony.xwork2.ValidationAwareSupport"/>
 *    </allow>
 * </dwr>
 *
 * <!-- END SNIPPET: dwrConfiguration -->
 * </pre>
 */
public class DWRValidator {
    private static final Logger LOG = LoggerFactory.getLogger(DWRValidator.class);
    
    public ValidationAwareSupport doPost(String namespace, String actionName, Map params) throws Exception {
        HttpServletRequest req = WebContextFactory.get().getHttpServletRequest();
        ServletContext servletContext = WebContextFactory.get().getServletContext();
        HttpServletResponse res = WebContextFactory.get().getHttpServletResponse();

        Map<String, Object> requestParams = new HashMap(req.getParameterMap());
        if (params != null) {
            requestParams.putAll(params);
        } else {
            params = requestParams;
        }
        Map requestMap = new RequestMap(req);
        Map session = new SessionMap(req);
        Map application = new ApplicationMap(servletContext);
        Dispatcher du = Dispatcher.getInstance();
        HashMap<String, Object> ctx = du.createContextMap(requestMap,
                params,
                session,
                application,
                req,
                res,
                servletContext);

        try {
            ActionProxyFactory actionProxyFactory = du.getContainer().getInstance(ActionProxyFactory.class);
            ActionProxy proxy = actionProxyFactory.createActionProxy(namespace, actionName, null, ctx, true, true);
            proxy.execute();
            Object action = proxy.getAction();

            if (action instanceof ValidationAware) {
                ValidationAware aware = (ValidationAware) action;
                ValidationAwareSupport vas = new ValidationAwareSupport();
                vas.setActionErrors(aware.getActionErrors());
                vas.setActionMessages(aware.getActionMessages());
                vas.setFieldErrors(aware.getFieldErrors());

                return vas;
            } else {
                return null;
            }
        } catch (Exception e) {
            LOG.error("Error while trying to validate", e);
            return null;
        }
    }

    public static class ValidatorActionInvocation extends DefaultActionInvocation {
        private static final long serialVersionUID = -7645433725470191275L;

        protected ValidatorActionInvocation(Map<String, Object> extraContext, boolean pushAction) throws Exception {
            super(extraContext, pushAction);
        }

        protected String invokeAction(Object action, ActionConfig actionConfig) throws Exception {
            return Action.NONE; // don't actually execute the action
        }
    }

}