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.attachment.AttachmentManager; 027import org.apache.wiki.pages.PageManager; 028 029 030/** 031 * Includes body if page has attachments. 032 * 033 * @since 2.0 034 */ 035public class HasAttachmentsTag extends WikiTagBase { 036 037 private static final long serialVersionUID = 0L; 038 private static final Logger LOG = LogManager.getLogger( HasAttachmentsTag.class ); 039 040 @Override 041 public final int doWikiStartTag() { 042 final Engine engine = m_wikiContext.getEngine(); 043 final Page page = m_wikiContext.getPage(); 044 final AttachmentManager mgr = engine.getManager( AttachmentManager.class ); 045 046 try { 047 if( page != null && engine.getManager( PageManager.class ).wikiPageExists(page) && mgr.attachmentsEnabled() ) { 048 if( mgr.hasAttachments(page) ) { 049 return EVAL_BODY_INCLUDE; 050 } 051 } 052 } catch( final ProviderException e ) { 053 LOG.fatal("Provider failed while trying to check for attachements",e); 054 // FIXME: THrow something. 055 } 056 057 return SKIP_BODY; 058 } 059 060}