rssgenerator.java

JSPWiki,100%Java开发的一套完整WIKI程序

            itemBuffer.append(" <item rdf:about=\""+url+"\">\n");

            itemBuffer.append("  <title>");
            itemBuffer.append( getEntryTitle(page) );
            itemBuffer.append("</title>\n");

            itemBuffer.append("  <link>");
            itemBuffer.append( url );
            itemBuffer.append("</link>\n");

            itemBuffer.append("  <description>");

            itemBuffer.append( format(getEntryDescription(page)) );

            itemBuffer.append("</description>\n");

            if( page.getVersion() != -1 )
            {
                itemBuffer.append("  <wiki:version>"+page.getVersion()+"</wiki:version>\n");
            }

            if( page.getVersion() > 1 )
            {
                itemBuffer.append("  <wiki:diff>"+
                              m_engine.getBaseURL()+"Diff.jsp?page="+
                              encodedName+
                              "&amp;r1=-1"+
                              "</wiki:diff>\n");
            }

            //
            //  Modification date.
            //
            itemBuffer.append("  <dc:date>");
            Calendar cal = Calendar.getInstance();
            cal.setTime( page.getLastModified() );
            cal.add( Calendar.MILLISECOND, 
                     - (cal.get( Calendar.ZONE_OFFSET ) + 
                        (cal.getTimeZone().inDaylightTime( page.getLastModified() ) ? cal.get( Calendar.DST_OFFSET ) : 0 )) );
            itemBuffer.append( iso8601fmt.format( cal.getTime() ) );
            itemBuffer.append("</dc:date>\n");

            //
            //  Author.
            //
            String author = getAuthor(page);
            itemBuffer.append("  <dc:contributor>\n");
            itemBuffer.append("   <rdf:Description");
            if( m_engine.pageExists(author) )
            {
                itemBuffer.append(" link=\""+m_engine.getViewURL(author)+"\"");
            }
            itemBuffer.append(">\n");
            itemBuffer.append("    <rdf:value>"+author+"</rdf:value>\n");
            itemBuffer.append("   </rdf:Description>\n");
            itemBuffer.append("  </dc:contributor>\n");


            //  PageHistory

            itemBuffer.append("  <wiki:history>");
            itemBuffer.append( m_engine.getBaseURL()+"PageInfo.jsp?page="+
                           encodedName );
            itemBuffer.append("</wiki:history>\n");

            //  Close up.
            itemBuffer.append(" </item>\n");
        }

        result.append("   </rdf:Seq>\n  </items>\n");
        result.append(" </channel>\n");

        result.append( itemBuffer.toString() );

        //
        //  In the end, add a search box for JSPWiki
        //
        
        String searchURL = m_engine.getBaseURL()+"Search.jsp";

        result.append(" <textinput rdf:about=\""+searchURL+"\">\n");

        result.append("  <title>Search</title>\n");
        result.append("  <description>Search this Wiki</description>\n");
        result.append("  <name>query</name>\n");
        result.append("  <link>"+searchURL+"</link>\n");

        result.append(" </textinput>\n");

        //
        //  Be a fine boy and close things.
        //


        result.append("</rdf:RDF>");

        return result.toString();
    }

    /**
     *  Generates an RSS/RDF 1.0 feed.  Each item should be an instance of the RSSItem class.
     */
    public String generateRSS( WikiContext wikiContext, List items, int limit )
    {
        StringBuffer result = new StringBuffer();
        SimpleDateFormat iso8601fmt = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");

        //
        //  Preamble
        //
        result.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n");

        result.append("<rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"\n"+
                      "   xmlns=\"http://purl.org/rss/1.0/\"\n"+
                      "   xmlns:dc=\"http://purl.org/dc/elements/1.1/\"\n"+
                      "   xmlns:wiki=\"http://purl.org/rss/1.0/modules/wiki/\">\n");

        //
        //  Channel.
        //

        result.append(" <channel rdf:about=\""+m_engine.getBaseURL()+"\">\n");

        result.append("  <title>").append(m_engine.getApplicationName()).append("</title>\n");

        // FIXME: This might fail in case the base url is not defined.
        result.append("  <link>").append(m_engine.getBaseURL()).append("</link>\n");

        result.append("  <description>");
        result.append( format(m_channelDescription) );
        result.append("</description>\n");
        
        result.append("  <language>");
        result.append( m_channelLanguage );
        result.append("</language>\n");

        //  We need two lists, which is why we gotta make a separate list if
        //  we want to do just a single pass.
        StringBuffer itemBuffer = new StringBuffer();

        result.append("  <items>\n   <rdf:Seq>\n");
        /*
        int numItems = 0;
        for( Iterator i = items.iterator(); i.hasNext() && numItems < limit; numItems++ )
        {
            RSSItem item = (RSSItem) i.next();

            result.append("    <rdf:li rdf:resource=\""+item.getURL(wikiContext)+"\" />\n");

            itemBuffer.append(" <item rdf:about=\""+item.getURL(wikiContext)+"\">\n");

            itemBuffer.append("  <title>");
            itemBuffer.append( item.getTitle() );
            itemBuffer.append("</title>\n");

            itemBuffer.append("  <link>");
            itemBuffer.append( item.getURL(wikiContext) );
            itemBuffer.append("</link>\n");

            itemBuffer.append("  <description>");

            itemBuffer.append( format( item.getDescription() ) );

            itemBuffer.append("</description>\n");

            if( page.getVersion() != -1 )
            {
                itemBuffer.append("  <wiki:version>"+page.getVersion()+"</wiki:version>\n");
            }

            if( page.getVersion() > 1 )
            {
                itemBuffer.append("  <wiki:diff>"+
                              m_engine.getBaseURL()+"Diff.jsp?page="+
                              encodedName+
                              "&amp;r1=-1"+
                              "</wiki:diff>\n");
            }

            //
            //  Modification date.
            //
            itemBuffer.append("  <dc:date>");
            Calendar cal = Calendar.getInstance();
            cal.setTime( page.getLastModified() );
            cal.add( Calendar.MILLISECOND, 
                     - (cal.get( Calendar.ZONE_OFFSET ) + 
                        (cal.getTimeZone().inDaylightTime( page.getLastModified() ) ? cal.get( Calendar.DST_OFFSET ) : 0 )) );
            itemBuffer.append( iso8601fmt.format( cal.getTime() ) );
            itemBuffer.append("</dc:date>\n");

            //
            //  Author.
            //
            String author = getAuthor(page);
            itemBuffer.append("  <dc:contributor>\n");
            itemBuffer.append("   <rdf:Description");
            if( m_engine.pageExists(author) )
            {
                itemBuffer.append(" link=\""+m_engine.getViewURL(author)+"\"");
            }
            itemBuffer.append(">\n");
            itemBuffer.append("    <rdf:value>"+author+"</rdf:value>\n");
            itemBuffer.append("   </rdf:Description>\n");
            itemBuffer.append("  </dc:contributor>\n");


            //  PageHistory

            itemBuffer.append("  <wiki:history>");
            itemBuffer.append( m_engine.getBaseURL()+"PageInfo.jsp?page="+
                           encodedName );
            itemBuffer.append("</wiki:history>\n");

            //  Close up.
            itemBuffer.append(" </item>\n");
        }
        */
        result.append("   </rdf:Seq>\n  </items>\n");
        result.append(" </channel>\n");

        result.append( itemBuffer.toString() );

        //
        //  In the end, add a search box for JSPWiki
        //
        
        String searchURL = m_engine.getBaseURL()+"Search.jsp";

        result.append(" <textinput rdf:about=\""+searchURL+"\">\n");

        result.append("  <title>Search</title>\n");
        result.append("  <description>Search this Wiki</description>\n");
        result.append("  <name>query</name>\n");
        result.append("  <link>"+searchURL+"</link>\n");

        result.append(" </textinput>\n");

        //
        //  Be a fine boy and close things.
        //


        result.append("</rdf:RDF>");

        return result.toString();
    }

}