org.jamwiki.servlets.HistoryServlet.java Source code

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Here is the source code for org.jamwiki.servlets.HistoryServlet.java

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/**
 * Licensed under the GNU LESSER GENERAL PUBLIC LICENSE, version 2.1, dated February 1999.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the latest version of the GNU Lesser General
 * Public License as published by the Free Software Foundation;
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program (LICENSE.txt); if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */
package org.jamwiki.servlets;

import java.text.DateFormat;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.lang.StringUtils;
import org.jamwiki.WikiBase;
import org.jamwiki.WikiException;
import org.jamwiki.WikiMessage;
import org.jamwiki.model.RecentChange;
import org.jamwiki.model.Topic;
import org.jamwiki.model.TopicVersion;
import org.jamwiki.utils.Pagination;
import org.jamwiki.utils.WikiLogger;
import org.jamwiki.utils.WikiUtil;
import org.springframework.web.servlet.ModelAndView;

/**
 * Used to display the edit history information for a topic.
 */
public class HistoryServlet extends JAMWikiServlet {

    private static final WikiLogger logger = WikiLogger.getLogger(HistoryServlet.class.getName());
    /** The name of the JSP file used to render the servlet output. */
    protected static final String JSP_HISTORY = "history.jsp";

    /**
      *
      */
    protected ModelAndView handleJAMWikiRequest(HttpServletRequest request, HttpServletResponse response,
            ModelAndView next, WikiPageInfo pageInfo) throws Exception {
        if (!StringUtils.isBlank(request.getParameter("topicVersionId"))) {
            viewVersion(request, next, pageInfo);
        } else {
            history(request, next, pageInfo);
        }
        return next;
    }

    /**
      *
      */
    private void history(HttpServletRequest request, ModelAndView next, WikiPageInfo pageInfo) throws Exception {
        String virtualWiki = pageInfo.getVirtualWikiName();
        String topicName = WikiUtil.getTopicFromRequest(request);
        if (StringUtils.isBlank(topicName)) {
            throw new WikiException(new WikiMessage("common.exception.notopic"));
        }
        pageInfo.setContentJsp(JSP_HISTORY);
        pageInfo.setTopicName(topicName);
        pageInfo.setPageTitle(new WikiMessage("history.title", topicName));
        Pagination pagination = ServletUtil.loadPagination(request, next);
        List<RecentChange> changes = WikiBase.getDataHandler().getTopicHistory(virtualWiki, topicName, pagination,
                true);
        if (changes != null && changes.size() > 0) {
            next.addObject("changes", changes);
            next.addObject("numChanges", changes.size());
        }
    }

    /**
      *
      */
    private void viewVersion(HttpServletRequest request, ModelAndView next, WikiPageInfo pageInfo)
            throws Exception {
        // display an older version
        String virtualWiki = pageInfo.getVirtualWikiName();
        String topicName = WikiUtil.getTopicFromRequest(request);
        Long topicVersionId = Long.parseLong(request.getParameter("topicVersionId"));
        TopicVersion topicVersion = WikiBase.getDataHandler().lookupTopicVersion(topicVersionId);
        if (topicVersion == null) {
            throw new WikiException(new WikiMessage("common.exception.notopic"));
        }
        Topic topic = WikiBase.getDataHandler().lookupTopic(virtualWiki, topicName, false, null);
        if (topic == null) {
            // the topic may have been deleted
            throw new WikiException(new WikiMessage("history.message.notopic", topicName));
        }
        topic.setTopicContent(topicVersion.getVersionContent());
        String versionDate = DateFormat.getDateTimeInstance().format(topicVersion.getEditDate());
        WikiMessage pageTitle = new WikiMessage("topic.title", topicName + " @" + versionDate);
        ServletUtil.viewTopic(request, next, pageInfo, pageTitle, topic, false, false);
    }
}