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.log4j.Logger; 022import org.apache.wiki.api.core.Attachment; 023import org.apache.wiki.api.core.Context; 024import org.apache.wiki.api.core.Engine; 025import org.apache.wiki.api.core.Page; 026import org.apache.wiki.api.exceptions.ProviderException; 027import org.apache.wiki.attachment.AttachmentManager; 028import org.apache.wiki.pages.PageManager; 029 030import javax.servlet.jsp.JspWriter; 031import javax.servlet.jsp.PageContext; 032import java.io.IOException; 033import java.util.List; 034 035 036/** 037 * Iterates through the list of attachments one has. 038 * 039 * <P><B>Attributes</B></P> 040 * <UL> 041 * <LI>page - Page name to refer to. Default is the current page. 042 * </UL> 043 * 044 * @since 2.0 045 */ 046// FIXME: Too much in common with IteratorTag - REFACTOR 047public class AttachmentsIteratorTag extends IteratorTag { 048 private static final long serialVersionUID = 0L; 049 050 private static final Logger log = Logger.getLogger( AttachmentsIteratorTag.class ); 051 052 /** 053 * {@inheritDoc} 054 */ 055 @Override 056 public final int doStartTag() { 057 m_wikiContext = (Context) pageContext.getAttribute( Context.ATTR_CONTEXT, PageContext.REQUEST_SCOPE ); 058 final Engine engine = m_wikiContext.getEngine(); 059 final AttachmentManager mgr = engine.getManager( AttachmentManager.class ); 060 final Page page; 061 062 page = m_wikiContext.getPage(); 063 064 if( !mgr.attachmentsEnabled() ) 065 { 066 return SKIP_BODY; 067 } 068 069 try { 070 if( page != null && engine.getManager( PageManager.class ).wikiPageExists(page) ) { 071 final List< Attachment > atts = mgr.listAttachments( page ); 072 073 if( atts == null ) { 074 log.debug("No attachments to display."); 075 // There are no attachments included 076 return SKIP_BODY; 077 } 078 079 m_iterator = atts.iterator(); 080 081 if( m_iterator.hasNext() ) { 082 final Attachment att = (Attachment) m_iterator.next(); 083 final Context context = m_wikiContext.clone(); 084 context.setPage( att ); 085 pageContext.setAttribute( Context.ATTR_CONTEXT, context, PageContext.REQUEST_SCOPE ); 086 pageContext.setAttribute( getId(), att ); 087 } else { 088 return SKIP_BODY; 089 } 090 } else { 091 return SKIP_BODY; 092 } 093 094 return EVAL_BODY_BUFFERED; 095 } catch( final ProviderException e ) { 096 log.fatal("Provider failed while trying to iterator through history",e); 097 // FIXME: THrow something. 098 } 099 100 return SKIP_BODY; 101 } 102 103 /** 104 * {@inheritDoc} 105 */ 106 @Override 107 public final int doAfterBody() { 108 if( bodyContent != null ) { 109 try { 110 final JspWriter out = getPreviousOut(); 111 out.print(bodyContent.getString()); 112 bodyContent.clearBody(); 113 } catch( final IOException e ) { 114 log.error("Unable to get inner tag text", e); 115 // FIXME: throw something? 116 } 117 } 118 119 if( m_iterator != null && m_iterator.hasNext() ) { 120 final Attachment att = ( Attachment )m_iterator.next(); 121 final Context context = m_wikiContext.clone(); 122 context.setPage( att ); 123 pageContext.setAttribute( Context.ATTR_CONTEXT, context, PageContext.REQUEST_SCOPE ); 124 pageContext.setAttribute( getId(), att ); 125 126 return EVAL_BODY_BUFFERED; 127 } 128 129 return SKIP_BODY; 130 } 131 132}