wikiengine.java

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                    }

                    m_referenceManager.updateReferences( page.getName(), links );
                }
            }
        }
        catch( ProviderException e )
        {
            log.fatal("PageProvider is unable to list pages: ", e);
        }

        log.info( "Cross reference scan done (" +
                  (System.currentTimeMillis()-start) +
                  " ms)" );

        m_pluginManager.enablePlugins( true );
    }


    /**
     *  Throws an exception if a property is not found.
     */
    public static String getRequiredProperty( Properties props, String key )
        throws NoRequiredPropertyException
    {
        String value = props.getProperty(key);

        if( value == null )
        {
            throw new NoRequiredPropertyException( "Required property not found",
                                                   key );
        }

        return value;
    }

    /**
     *  Internal method for getting a property.  This is used by the
     *  TranslatorReader for example.
     */

    public Properties getWikiProperties()
    {
        return m_properties;
    }

    /**
     *  @since 1.8.0
     */
    public String getPluginSearchPath()
    {
        // FIXME: This method should not be here, probably.
        return m_properties.getProperty( PluginManager.PROP_SEARCHPATH );
    }

    /**
     *  Returns the current template directory.
     *
     *  @since 1.9.20
     */
    public String getTemplateDir()
    {
        return m_templateDir;
    }

    /**
     *  Returns the base URL.  Always prepend this to any reference
     *  you make.
     *
     *  @since 1.6.1
     */

    public String getBaseURL()
    {
        return m_baseURL;
    }

    /**
     *  Returns the moment when this engine was started.
     * 
     *  @since 2.0.15.
     */

    public Date getStartTime()
    {
        return m_startTime;
    }

    /**
     *  Returns the basic URL to a page, without any modifications.
     *  You may add any parameters to this.
     *
     *  @since 2.0.3
     */
    public String getViewURL( String pageName )
    {/*
        pageName = encodeName( pageName );
        String srcString = "%uWiki.jsp?page=%p";

        srcString = TextUtil.replaceString( srcString, "%u", m_baseURL );
        srcString = TextUtil.replaceString( srcString, "%p", pageName );

        return srcString;
     */
        return m_baseURL+"Wiki.jsp?page="+encodeName(pageName);
    }

    /**
     *  Returns the basic URL to an editor.
     *
     *  @since 2.0.3
     */
    public String getEditURL( String pageName )
    {
        return m_baseURL+"Edit.jsp?page="+encodeName(pageName);
    }

    /**
     *  Returns the basic attachment URL.
     *  @since 2.0.42.
     */
    public String getAttachmentURL( String attName )
    {
        return m_baseURL+"attach?page="+encodeName(attName);
    }

    /**
     *  Returns the default front page, if no page is used.
     */

    public String getFrontPage()
    {
        return m_frontPage;
    }

    /**
     *  Returns the ServletContext that this particular WikiEngine was
     *  initialized with.  <B>It may return null</B>, if the WikiEngine is not
     *  running inside a servlet container!
     *
     *  @since 1.7.10
     *  @return ServletContext of the WikiEngine, or null.
     */

    public ServletContext getServletContext()
    {
        return m_servletContext;
    }

    /**
     *  This is a safe version of the Servlet.Request.getParameter() routine.
     *  Unfortunately, the default version always assumes that the incoming
     *  character set is ISO-8859-1, even though it was something else.
     *  This means that we need to make a new string using the correct
     *  encoding.
     *  <P>
     *  For more information, see:
     *     <A HREF="http://www.jguru.com/faq/view.jsp?EID=137049">JGuru FAQ</A>.
     *  <P>
     *  Incidentally, this is almost the same as encodeName(), below.
     *  I am not yet entirely sure if it's safe to merge the code.
     *
     *  @since 1.5.3
     */

    public String safeGetParameter( ServletRequest request, String name )
    {
        try
        {
            String res = request.getParameter( name );
            if( res != null ) 
            {
                res = new String(res.getBytes("ISO-8859-1"),
                                 getContentEncoding() );
            }

            return res;
        }
        catch( UnsupportedEncodingException e )
        {
            log.fatal( "Unsupported encoding", e );
            return "";
        }

    }


    /**
     *  Returns the query string (the portion after the question mark).
     *
     *  @return The query string.  If the query string is null,
     *   returns an empty string.
     *
     *  @since 2.0.40.
     */
    public String safeGetQueryString( HttpServletRequest request )
    {
        if (request == null)
        {
            return "";
        }

        try
        {
            String res = request.getQueryString();
            if( res != null )
            {
                res = new String(res.getBytes("ISO-8859-1"),
                                 getContentEncoding() );

                //
                // Ensure that the 'page=xyz' attribute is removed
                // FIXME: Is it really the mandate of this routine to
                //        do that?
                //
                int pos1 = res.indexOf("page=");
                if (pos1 >= 0)
                {
                    String tmpRes = res.substring(0, pos1);
                    int pos2 = res.indexOf("&",pos1) + 1;
                    if ( (pos2 > 0) && (pos2 < res.length()) )
                    {
                        tmpRes = tmpRes + res.substring(pos2);
                    }
                    res = tmpRes;
                }
            }

            return res;
        }
        catch( UnsupportedEncodingException e )
        {
            log.fatal( "Unsupported encoding", e );
            return "";
        }
    }

    /**
     *  Returns an URL to some other Wiki that we know.
     *
     *  @return null, if no such reference was found.
     */
    public String getInterWikiURL( String wikiName )
    {
        return m_properties.getProperty(PROP_INTERWIKIREF+wikiName);
    }

    /**
     *  Returns a collection of all supported InterWiki links.
     */
    public Collection getAllInterWikiLinks()
    {
        Vector v = new Vector();

        for( Enumeration i = m_properties.propertyNames(); i.hasMoreElements(); )
        {
            String prop = (String) i.nextElement();

            if( prop.startsWith( PROP_INTERWIKIREF ) )
            {
                v.add( prop.substring( prop.lastIndexOf(".")+1 ) );
            }
        }

        return v;
    }

    /**
     *  Returns a collection of all image types that get inlined.
     */

    public Collection getAllInlinedImagePatterns()
    {
        return TranslatorReader.getImagePatterns( this );
    }

    /**
     *  If the page is a special page, then returns a direct URL
     *  to that page.  Otherwise returns null.
     *  <P>
     *  Special pages are non-existant references to other pages.
     *  For example, you could define a special page reference
     *  "RecentChanges" which would always be redirected to "RecentChanges.jsp"
     *  instead of trying to find a Wiki page called "RecentChanges".
     */
    public String getSpecialPageReference( String original )
    {
        String propname = "jspwiki.specialPage."+original;
        String specialpage = m_properties.getProperty( propname );

        return specialpage;
    }

    /**
     *  Returns the name of the application.
     */

    // FIXME: Should use servlet context as a default instead of a constant.
    public String getApplicationName()
    {
        String appName = m_properties.getProperty("jspwiki.applicationName");

        if( appName == null )
            return Release.APPNAME;

        return appName;
    }

    /**
     *  Beautifies the title of the page by appending spaces in suitable
     *  places.
     *
     *  @since 1.7.11
     */
    public String beautifyTitle( String title )
    {
        if( m_beautifyTitle )
        {
            return TextUtil.beautifyString( title );
        }

        return title;
    }

    /**
     *  Returns true, if the requested page (or an alias) exists.  Will consider
     *  any version as existing.  Will also consider attachments.
     *
     *  @param page WikiName of the page.
     */
    public boolean pageExists( String page )
    {
        if( getSpecialPageReference(page) != null ) return true;

        if( getFinalPageName( page ) != null )
        {
            return true;
        }

        Attachment att = null;

        try
        {
            att = getAttachmentManager().getAttachmentInfo( (WikiContext)null, page );
        }
        catch( ProviderException e )
        {
            log.debug("pageExists() failed to find attachments",e);
        }

        return att != null;
    }

    /**
     *  Returns true, if the requested page (or an alias) exists with the
     *  requested version.
     *
     *  @param page Page name
     */
    public boolean pageExists( String page, int version )
        throws ProviderException
    {
        if( getSpecialPageReference(page) != null ) return true;

        String finalName = getFinalPageName( page );
        WikiPage p = null;

        if( finalName != null )
        {
            //
            //  Go and check if this particular version of this page
            //  exists.
            //
            p = m_pageManager.getPageInfo( finalName, version );
        }

        if( p == null )
        {
            try
            {
                p = getAttachmentManager().getAttachmentInfo( (WikiContext)null, page, version );
            }
            catch( ProviderException e )
            {
                log.debug("pageExists() failed to find attachments",e);
            }
        }

        return (p != null);
    }

    /**
     *  Returns true, if the requested page (or an alias) exists, with the
     *  specified version in the WikiPage.
     *
     *  @since 2.0
     */
    public boolean pageExists( WikiPage page )
        throws ProviderException
    {
        if( page != null )
        {
            return pageExists( page.getName(), page.getVersion() );
        }
        return false;
    }

    /**
     *  Returns the correct page name, or null, if no such
     *  page can be found.  Aliases are considered.
     *  <P>
     *  In some cases, page names can refer to other pages.  For example,
     *  when you have matchEnglishPlurals set, then a page name "Foobars"
     *  will be transformed into "Foobar", should a page "Foobars" not exist,
     *  but the page "Foobar" would.  This method gives you the correct
     *  page name to refer to.
     *  <P>
     *  This facility can also be used to rewrite any page name, for example,
     *  by using aliases.  It can also be used to check the existence of any
     *  page.
     *