private void refreshBlacklists()

in jspwiki-main/src/main/java/org/apache/wiki/filters/SpamFilter.java [675:725]
42 lines of code
19 McCabe index (conditional complexity)

    private void refreshBlacklists( final Context context ) {
        try {
            boolean rebuild = false;

            //  Rebuild, if the spam words page, the attachment or the IP ban page has changed since.
            final Page sourceSpam = context.getEngine().getManager( PageManager.class ).getPage( m_forbiddenWordsPage );
            if( sourceSpam != null ) {
                if( m_spamPatterns == null || m_spamPatterns.isEmpty() || sourceSpam.getLastModified().after( m_lastRebuild ) ) {
                    rebuild = true;
                }
            }

            final Attachment att = context.getEngine().getManager( AttachmentManager.class ).getAttachmentInfo( context, m_blacklist );
            if( att != null ) {
                if( m_spamPatterns == null || m_spamPatterns.isEmpty() || att.getLastModified().after( m_lastRebuild ) ) {
                    rebuild = true;
                }
            }

            final Page sourceIPs = context.getEngine().getManager( PageManager.class ).getPage( m_forbiddenIPsPage );
            if( sourceIPs != null ) {
                if( m_IPPatterns == null || m_IPPatterns.isEmpty() || sourceIPs.getLastModified().after( m_lastRebuild ) ) {
                    rebuild = true;
                }
            }

            //  Do the actual rebuilding.  For simplicity's sake, we always rebuild the complete filter list regardless of what changed.
            if( rebuild ) {
                m_lastRebuild = new Date();
                m_spamPatterns = parseWordList( sourceSpam, ( sourceSpam != null ) ? sourceSpam.getAttribute( LISTVAR ) : null );

                LOG.info( "Spam filter reloaded - recognizing " + m_spamPatterns.size() + " patterns from page " + m_forbiddenWordsPage );

                m_IPPatterns = parseWordList( sourceIPs,  ( sourceIPs != null ) ? sourceIPs.getAttribute( LISTIPVAR ) : null );
                LOG.info( "IP filter reloaded - recognizing " + m_IPPatterns.size() + " patterns from page " + m_forbiddenIPsPage );

                if( att != null ) {
                    final InputStream in = context.getEngine().getManager( AttachmentManager.class ).getAttachmentStream(att);
                    final StringWriter out = new StringWriter();
                    FileUtil.copyContents( new InputStreamReader( in, StandardCharsets.UTF_8 ), out );
                    final Collection< Pattern > blackList = parseBlacklist( out.toString() );
                    LOG.info( "...recognizing additional " + blackList.size() + " patterns from blacklist " + m_blacklist );
                    m_spamPatterns.addAll( blackList );
                }
            }
        } catch( final IOException ex ) {
            LOG.info( "Unable to read attachment data, continuing...", ex );
        } catch( final ProviderException ex ) {
            LOG.info( "Failed to read spam filter attachment, continuing...", ex );
        }
    }