cn.vlabs.duckling.vwb.ui.action.ViewPageAction.java Source code

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Here is the source code for cn.vlabs.duckling.vwb.ui.action.ViewPageAction.java

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/*
 * Copyright (c) 2008-2016 Computer Network Information Center (CNIC), Chinese Academy of Sciences.
 * 
 * This file is part of Duckling project.
 *
 * 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 cn.vlabs.duckling.vwb.ui.action;

import java.io.IOException;

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

import org.apache.commons.httpclient.HttpStatus;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

import cn.vlabs.duckling.vwb.VWBContext;
import cn.vlabs.duckling.vwb.service.dpage.DPage;
import cn.vlabs.duckling.vwb.service.dpage.DPageService;
import cn.vlabs.duckling.vwb.service.render.impl.DPageRendable;
import cn.vlabs.duckling.vwb.ui.base.BaseAction;
import cn.vlabs.duckling.vwb.ui.command.DPageCommand;

/**
 * Introduction Here.
 * @date 2010-3-8
 * @author  diyanliang@cnic.cn
 */
public class ViewPageAction extends BaseAction {
    public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request,
            HttpServletResponse response) {
        DPage page = (DPage) getSavedViewPort(request);
        VWBContext context = VWBContext.createContext(request, DPageCommand.VIEW, page);
        if (context.hasAccess(response)) {
            int version = getRequestVersion(request);
            ActionForward forward = null;
            if (VWBContext.LATEST_VERSION != version && page.getVersion() != version) {
                DPageService dpageService = VWBContext.getContainer().getDpageService();
                DPage versionPage = dpageService.getDpageVersionContent(context.getSite().getId(),
                        page.getResourceId(), version);
                if (versionPage != null) {
                    context.targetCommand(versionPage);
                    forward = layout(context,
                            new DPageRendable(versionPage.getResourceId(), versionPage.getVersion()));
                } else {
                    log.warn(String.format("Page's conent id=%d, version=%d is not found.", page.getResourceId(),
                            version));
                    try {
                        response.sendError(HttpStatus.SC_NOT_FOUND);
                    } catch (IOException e) {
                        log.error("forward to not found page failed.", e);
                    }
                    return null;
                }
            } else {
                forward = layout(context);
            }
            return forward;
        }
        return null;
    }

    private int getRequestVersion(HttpServletRequest request) {
        String version = request.getParameter("version");
        if (version != null) {
            try {
                return Integer.parseInt(version);
            } catch (NumberFormatException e) {
                log.warn(e.getMessage());
            }
        }
        return VWBContext.LATEST_VERSION;
    }
}