jforum example source code file (Edit.jsp)

This example jforum source code file (Edit.jsp) 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 - jforum tags/keywords

date, date, editing, no, pagelock, pagelock, string, string, stringbuffer, user, wikiengine, wikipage, wikipage, wikisession

The jforum Edit.jsp source code

<%@ page import="org.apache.log4j.*" %>
<%@ page import="com.ecyrd.jspwiki.*" %>
<%@ page import="com.ecyrd.jspwiki.filters.*" %>
<%@ page import="java.util.*" %>
<%@ page import="com.ecyrd.jspwiki.ui.EditorManager" %>
<%@ page import="com.ecyrd.jspwiki.htmltowiki.HtmlStringToWikiTranslator" %>
<%@ page errorPage="/Error.jsp" %>
<%@ taglib uri="/WEB-INF/jspwiki.tld" prefix="wiki" %>

<%! 
    public void jspInit()
    {
        wiki = WikiEngine.getInstance( getServletConfig() );
    }

    Logger log = Logger.getLogger("JSPWiki");
    WikiEngine wiki;
%>

<%
    // Create wiki context and check for authorization
    WikiContext wikiContext = wiki.createContext( request, WikiContext.EDIT );
    if(!wikiContext.hasAccess( response )) return;
    String pagereq = wikiContext.getName();
    
    WikiSession wikiSession = wikiContext.getWikiSession(); 
    String user = wikiSession.getUserPrincipal().getName();
    String action  = request.getParameter("action");
    String ok      = request.getParameter("ok");
    String preview = request.getParameter("preview");
    String cancel  = request.getParameter("cancel");
    String append  = request.getParameter("append");
    String edit    = request.getParameter("edit");
    String author  = request.getParameter( "author" );
    String changenote = request.getParameter( "changenote" );
    String text    = EditorManager.getEditedText( pageContext );
    if ( !wikiSession.isAuthenticated() && wikiSession.isAnonymous() 
         && author != null )
    {
        user  = request.getParameter( "author" );
    }

    //
    //  WYSIWYG editor sends us its greetings
    //
    String htmlText = request.getParameter( "htmlPageText" );
    if( htmlText != null && cancel == null ) 
    {
        text = new HtmlStringToWikiTranslator().translate(htmlText,wikiContext);
    }

    WikiPage wikipage = wikiContext.getPage();
    WikiPage latestversion = wiki.getPage( pagereq );

    if( latestversion == null )
    {
        latestversion = wikiContext.getPage();
    }
    
    //
    //  Set the response type before we branch.
    //

    response.setContentType("text/html; charset="+wiki.getContentEncoding() );
    response.setHeader( "Cache-control", "max-age=0" );
    response.setDateHeader( "Expires", new Date().getTime() );
    response.setDateHeader( "Last-Modified", new Date().getTime() );

    //log.debug("Request character encoding="+request.getCharacterEncoding());
    //log.debug("Request content type+"+request.getContentType());
    log.debug("preview="+preview+", ok="+ok);

    if( ok != null )
    {
        log.info("Saving page "+pagereq+". User="+user+", host="+request.getRemoteAddr() );

        WikiPage modifiedPage = (WikiPage)wikiContext.getPage().clone();

        //  FIXME: I am not entirely sure if the JSP page is the
        //  best place to check for concurrent changes.  It certainly
        //  is the best place to show errors, though.
       
        long pagedate   = Long.parseLong(request.getParameter("edittime"));

        Date change = latestversion.getLastModified();

        if( change != null && change.getTime() != pagedate )
        {
            //
            // Someone changed the page while we were editing it!
            //

            log.info("Page changed, warning user.");

            session.setAttribute( EditorManager.REQ_EDITEDTEXT, EditorManager.getEditedText(pageContext) );
            response.sendRedirect( wiki.getURL(WikiContext.CONFLICT, pagereq, null, false) );
            return;
        }

        //
        //  We expire ALL locks at this moment, simply because someone has
        //  already broken it.
        //
        PageLock lock = wiki.getPageManager().getCurrentLock( wikipage );
        wiki.getPageManager().unlockPage( lock );
        session.removeAttribute( "lock-"+pagereq );

        //
        //  Set author information and other metadata
        //

        modifiedPage.setAuthor( user );
    
        if( changenote == null ) changenote = (String) session.getAttribute("changenote");
        
        session.removeAttribute("changenote");
        
        if( changenote != null && changenote.length() > 0 )
        {
            modifiedPage.setAttribute( WikiPage.CHANGENOTE, changenote );
        }
        else
        {
            modifiedPage.removeAttribute( WikiPage.CHANGENOTE );
        }

        //
        //  Figure out the actual page text
        //

        if( text == null )
        {
            throw new ServletException( "No parameter text set!" );
        }

        //
        //  If this is an append, then we just append it to the page.
        //  If it is a full edit, then we will replace the previous contents.
        //

        try
        {
            wikiContext.setPage( modifiedPage );
            
            if( append != null )
            {
                StringBuffer pageText = new StringBuffer(wiki.getText( pagereq ));

                pageText.append( text );

                wiki.saveText( wikiContext, pageText.toString() );
            }
            else
            {
                wiki.saveText( wikiContext, text );
            }
        }
        catch( RedirectException ex )
        {
            // wikiContext.getWikiSession().addMessage( ex.getMessage() ); // FIXME: should work, but doesn't
            session.setAttribute( VariableManager.VAR_MSG, ex.getMessage() );
            response.sendRedirect( ex.getRedirect() );
            return;
        }

        response.sendRedirect(wiki.getViewURL(pagereq));
        return;
    }
    else if( preview != null )
    {
        log.debug("Previewing "+pagereq);
        session.setAttribute(EditorManager.REQ_EDITEDTEXT,
                             EditorManager.getEditedText(pageContext));
        if( changenote != null ) session.setAttribute("changenote", changenote);
        response.sendRedirect( wiki.getURL(WikiContext.PREVIEW,pagereq,null,false) );
        return;
    }
    else if( cancel != null )
    {
        log.debug("Cancelled editing "+pagereq);
        PageLock lock = (PageLock) session.getAttribute( "lock-"+pagereq );

        if( lock != null )
        {
            wiki.getPageManager().unlockPage( lock );
            session.removeAttribute( "lock-"+pagereq );
        }
        response.sendRedirect( wiki.getViewURL(pagereq) );
        return;
    }

    log.info("Editing page "+pagereq+". User="+user+", host="+request.getRemoteAddr() );

    //
    //  Determine and store the date the latest version was changed.  Since
    //  the newest version is the one that is changed, we need to track
    //  that instead of the edited version.
    //
    long lastchange = 0;
    
    Date d = latestversion.getLastModified();
    if( d != null ) lastchange = d.getTime();

    pageContext.setAttribute( "lastchange",
                              Long.toString( lastchange ),
                              PageContext.REQUEST_SCOPE );

    //
    //  Attempt to lock the page.
    //
    PageLock lock = wiki.getPageManager().lockPage( wikipage, 
                                                    user );

    if( lock != null )
    {
        session.setAttribute( "lock-"+pagereq, lock );
    }

    String contentPage = wiki.getTemplateManager().findJSP( pageContext,
                                                            wikiContext.getTemplate(),
                                                            "EditTemplate.jsp" );
    
%><wiki:Include page="<%=contentPage%>" />