    001/*
    002    Licensed to the Apache Software Foundation (ASF) under one
    003    or more contributor license agreements.  See the NOTICE file
    004    distributed with this work for additional information
    005    regarding copyright ownership.  The ASF licenses this file
    006    to you under the Apache License, Version 2.0 (the
    007    "License"); you may not use this file except in compliance
    008    with the License.  You may obtain a copy of the License at
    009
    010       http://www.apache.org/licenses/LICENSE-2.0
    011
    012    Unless required by applicable law or agreed to in writing,
    013    software distributed under the License is distributed on an
    014    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    015    KIND, either express or implied.  See the License for the
    016    specific language governing permissions and limitations
    017    under the License.
    018 */
    019package org.apache.wiki.tags;
    020
    021import org.apache.logging.log4j.LogManager;
    022import org.apache.logging.log4j.Logger;
    023import org.apache.wiki.api.core.Engine;
    024import org.apache.wiki.api.core.Page;
    025import org.apache.wiki.api.exceptions.ProviderException;
    026import org.apache.wiki.pages.PageManager;
    027
    028import java.io.IOException;
    029
    030/**
    031 *  Returns the currently requested page or attachment size.
    032 *
    033 *  @since 2.0
    034 */
    035public class PageSizeTag extends WikiTagBase {
    036
    037    private static final long serialVersionUID = 0L;
    038    private static final Logger LOG = LogManager.getLogger( PageSizeTag.class );
    039
    040    @Override
    041    public final int doWikiStartTag() throws IOException {
    042        final Engine engine = m_wikiContext.getEngine();
    043        final Page page = m_wikiContext.getPage();
    044
    045        try {
    046            if( page != null ) {
    047                long size = page.getSize();
    048
    049                if( size == -1 && engine.getManager( PageManager.class ).wikiPageExists( page ) ) { // should never happen with attachments
    050                    size = engine.getManager( PageManager.class ).getPureText( page.getName(), page.getVersion() ).length();
    051                    page.setSize( size );
    052                }
    053
    054                pageContext.getOut().write( Long.toString(size) );
    055            }
    056        } catch( final ProviderException e ) {
    057            LOG.warn("Providers did not work: ",e);
    058            pageContext.getOut().write("Error determining page size. More information is available in the system logs.");
    059        }
    060
    061        return SKIP_BODY;
    062    }
    063
    064}