/**
* 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.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.WikiMessage;
import org.jamwiki.model.TopicVersion;
import org.jamwiki.model.WikiDiff;
import org.jamwiki.utils.DiffUtil;
import org.jamwiki.utils.WikiLogger;
import org.jamwiki.utils.WikiUtil;
import org.springframework.web.servlet.ModelAndView;
/**
* Used to display a diff between two versions of a topic.
*/
public class DiffServlet extends JAMWikiServlet {
private static final WikiLogger logger = WikiLogger.getLogger(DiffServlet.class.getName());
/** The name of the JSP file used to render the servlet output. */
protected static final String JSP_DIFF = "diff.jsp";
/**
*
*/
protected ModelAndView handleJAMWikiRequest(HttpServletRequest request, HttpServletResponse response, ModelAndView next, WikiPageInfo pageInfo) throws Exception {
this.diff(request, next, pageInfo);
return next;
}
/**
*
*/
private void diff(HttpServletRequest request, ModelAndView next, WikiPageInfo pageInfo) throws Exception {
String topicName = WikiUtil.getTopicFromRequest(request);
Long topicVersionId1 = 0L;
if (!StringUtils.isBlank(request.getParameter("version1"))) {
topicVersionId1 = Long.valueOf(request.getParameter("version1"));
}
Long topicVersionId2 = 0L;
if (!StringUtils.isBlank(request.getParameter("version2"))) {
topicVersionId2 = Long.valueOf(request.getParameter("version2"));
}
TopicVersion version1 = WikiBase.getDataHandler().lookupTopicVersion(topicVersionId1);
TopicVersion version2 = WikiBase.getDataHandler().lookupTopicVersion(topicVersionId2);
if (version1 == null && version2 == null) {
String msg = "Versions " + topicVersionId1 + " and " + topicVersionId2 + " not found for " + topicName;
logger.severe(msg);
throw new Exception(msg);
}
String contents1 = (version1 != null) ? version1.getVersionContent() : null;
String contents2 = (version2 != null) ? version2.getVersionContent() : null;
if (contents1 == null && contents2 == null) {
String msg = "No versions found for " + topicVersionId1 + " against " + topicVersionId2;
logger.severe(msg);
throw new Exception(msg);
}
List<WikiDiff> diffs = DiffUtil.diff(contents1, contents2);
next.addObject("diffs", diffs);
pageInfo.setPageTitle(new WikiMessage("diff.title", topicName));
pageInfo.setTopicName(topicName);
pageInfo.setContentJsp(JSP_DIFF);
}
}