configaction.java

电子地图服务器,搭建自己的地图服务

/* Copyright (c) 2001 - 2007 TOPP - www.openplans.org.  All rights reserved.
 * This code is licensed under the GPL 2.0 license, availible at the root
 * application directory.
 */
package org.vfny.geoserver.action;

import org.apache.struts.Globals;
import org.apache.struts.action.ActionError;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.vfny.geoserver.config.DataConfig;
import org.vfny.geoserver.config.GlobalConfig;
import org.vfny.geoserver.config.WCSConfig;
import org.vfny.geoserver.config.WFSConfig;
import org.vfny.geoserver.config.WMSConfig;
import org.vfny.geoserver.config.validation.ValidationConfig;
import org.vfny.geoserver.global.ApplicationState;
import org.vfny.geoserver.global.Data;
import org.vfny.geoserver.global.UserContainer;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


/**
 * GeoConfigAction is a common super class used by STRUTS Actions.
 *
 * <p>
 * ConfigAction is used to store shared services, such as looking up the
 * Configuration Model.
 * </p>
 * Capabilities:
 *
 * <ul>
 * <li>
 * Config (Model) Access: Convience routines have been writen to allow access
 * to the Config Model from the Web Container.
 * </li>
 * <li>Since configuraiton should only be attempted when logged in, an effort has been made to smooth the
 * required login check required by most geoserver config actions.
 * </li>
 * </ul>
 * <p>
 * Most config actions require the follow check to be made:
 * <pre><code>
 * <b>class</b> MyConfigAction <b>extends</b> ConfigAction {
 *   Redirect execute( HttpServletRequest request, ){
 *     <b>if</b>( !isLoggedIn( request )){
 *       return new Redirect(�Login Page�);
 *     }
 *     UserContainer user = getUserContainer( request );
 *     �
 *     <b>return new</b> Redirect(�my.jsp�);
 *   }
 * }
 * </code></pre>
 * </p>
 * <p>
 * To prevent the duplication of the above code in each and every config
 * action pleaes make use of the alternate execute method:
 * <pre><code>
 * <b>class</b> MyConfigAction <b>extends</b> ConfigAction {
 *   Redirect execute( UserContainer user, HttpServletRequest request ){
 *     �
 *     <b>return new</b> Redirect(�my.jsp�);
 *   }
 * }
 * </code></pre>
 * </p>
 * Please remember that Actions (like servlets) should never make use of
 * instance variables in order to remain thread-safe.
 * </p>
 *
 * @author Jody Garnett, Refractions Research, Inc.
 * @author jive
 * @author $Author: Alessio Fabiani ([e-mail]) $ (last modification)
 * @author $Author: Simone Giannecchini ([e-mail]) $ (last modification)
 * @version $Id: ConfigAction.java 6958 2007-06-08 16:20:59Z aaime $
 */
public class ConfigAction extends GeoServerAction {
    /**
     * Execute method that redirects user if not loggin in.
     * <p>
     * The UserContainer is gathered from the session context using the
     * GeoServerAction.getUserContainer( request method ).
     * </p>
     * @see org.apache.struts.action.Action#execute(org.apache.struts.action.ActionMapping, org.apache.struts.action.ActionForm, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
     */
    public ActionForward execute(ActionMapping mapping, ActionForm form,
        HttpServletRequest request, HttpServletResponse response)
        throws Exception {
        //        if (!isLoggedIn(request)) {
        //            ActionErrors errors = new ActionErrors();
        //            errors.add(ActionErrors.GLOBAL_ERROR, new ActionError("error.login.required"));
        //            request.setAttribute(Globals.ERROR_KEY, errors);
        //            request.setAttribute("forward", mapping.getForward());
        //
        //            return mapping.findForward("login");
        //        }
        return execute(mapping, form, getUserContainer(request), request, response);
    }

    /**
     * A "safe" execute method, only called after the user has logged in.
    * <p>
    * You may still override the normal execute method if you do not require
    * this service.
    * </p>
     */
    public ActionForward execute(ActionMapping mapping, ActionForm form, UserContainer user,
        HttpServletRequest request, HttpServletResponse response)
        throws Exception {
        return null;
    }

    /**
     * Access Web Map Server Configuration Model from the WebContainer.
     *
     * <p>
     * Note that this represents the Configuration and not the state of the Web
     * Feature Server.
     * </p>
     *
     * @return Configuration information for the Web Map Server
     */
    protected WMSConfig getWMSConfig() {
        return (WMSConfig) getServlet().getServletContext().getAttribute(WMSConfig.CONFIG_KEY);
    }

    /**
     * Access Web Feature Server Configuration Model from the WebContainer.
     *
     * <p>
     * Note that this represents the Configuration and not the state of the Web
     * Feature Server.
     * </p>
     *
     * @return Configuration information for Web Feature Server
     */
    protected WFSConfig getWFSConfig() {
        return (WFSConfig) getServlet().getServletContext().getAttribute(WFSConfig.CONFIG_KEY);
    }

    /**
     * Access Web Coverage Server Configuration Model from the WebContainer.
     *
     * <p>
     * Note that this represents the Configuration and not the state of the Web
     * Coverage Server.
     * </p>
     *
     * @return Configuration information for Web Coverage Server
     */
    protected WCSConfig getWCSConfig() {
        return (WCSConfig) getServlet().getServletContext().getAttribute(WCSConfig.CONFIG_KEY);
    }

    /**
     * Access Web Map Server Configuration Model from the WebContainer.
     *
     * @return Configuration model for Global information.
     */
    protected GlobalConfig getGlobalConfig() {
        return (GlobalConfig) getServlet().getServletContext().getAttribute(GlobalConfig.CONFIG_KEY);
    }

    /**
     * Access Catalog Configuration Model from the WebContainer.
     *
     * @return Configuration model for Catalog information.
     */
    protected DataConfig getDataConfig() {
        return (DataConfig) getServlet().getServletContext().getAttribute(DataConfig.CONFIG_KEY);
    }

    /**
     * Access Catalog Model from the WebContainer.
     *
     * @return Configuration model for Catalog information.
     */
    protected Data getData() {
        return (Data) getServlet().getServletContext().getAttribute(Data.WEB_CONTAINER_KEY);
    }

    /**
     * Access Catalog Configuration Model from the WebContainer.
     *
     * @return Configuration model for Catalog information.
     */
    protected ValidationConfig getValidationConfig() {
        return (ValidationConfig) getServlet().getServletContext()
                                      .getAttribute(ValidationConfig.CONFIG_KEY);
    }

    /**
     * Access Catalog Configuration Model from the WebContainer.
     *
     * @return Configuration model for Catalog information.
     */
    protected ApplicationState getApplicationState() {
        return (ApplicationState) getServlet().getServletContext()
                                      .getAttribute(ApplicationState.WEB_CONTAINER_KEY);
    }
}