package com.kadawoo.jspwiki.plugin;

import org.apache.log4j.Logger;
import com.ecyrd.jspwiki.*;
import java.util.*;
import com.ecyrd.jspwiki.plugin.*;

public class ReferringUndefinedPagesPlugin
    extends AbstractReferralPlugin
{
    private static Logger log = Logger.getLogger( UndefinedPagesPlugin.class );

    public String execute( WikiContext context, Map params )
        throws PluginException
    {
        ReferenceManager refmgr = context.getEngine().getReferenceManager();
        Collection links = refmgr.findUncreated();

        super.initialize( context, params );

        Collection result = null;
        if (links != null) {
            TreeMap sortedMap = new TreeMap();
            for (Iterator i = links.iterator(); i.hasNext();) {
                String uncreatedPageName = (String) i.next();
                Collection referrers = refmgr.findReferrers(uncreatedPageName);
                if (referrers != null) {
                    for (Iterator ii = referrers.iterator(); ii.hasNext();) {
                        sortedMap.put(ii.next(), "");
                    }
                }
            }
            result = sortedMap.keySet();
        }
        
        String wikitext = wikitizeCollection(result, m_separator, ALL_ITEMS );
        
        return makeHTML( context, wikitext );
    }
     
}