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 java.io.IOException; 022import java.util.Collection; 023 024import javax.servlet.jsp.JspWriter; 025import javax.servlet.jsp.PageContext; 026 027import org.apache.log4j.Logger; 028import org.apache.wiki.WikiEngine; 029import org.apache.wiki.WikiContext; 030import org.apache.wiki.WikiPage; 031import org.apache.wiki.api.exceptions.ProviderException; 032 033/** 034 * Iterates through tags. 035 * 036 * <P><B>Attributes</B></P> 037 * <UL> 038 * <LI>page - Page name to refer to. Default is the current page. 039 * </UL> 040 * 041 * @since 2.0 042 */ 043 044// FIXME: Too much in common with IteratorTag - REFACTOR 045public class HistoryIteratorTag 046 extends IteratorTag 047{ 048 private static final long serialVersionUID = 0L; 049 050 static Logger log = Logger.getLogger( HistoryIteratorTag.class ); 051 052 public final int doStartTag() 053 { 054 m_wikiContext = (WikiContext) pageContext.getAttribute( WikiTagBase.ATTR_CONTEXT, 055 PageContext.REQUEST_SCOPE ); 056 057 WikiEngine engine = m_wikiContext.getEngine(); 058 WikiPage page; 059 060 page = m_wikiContext.getPage(); 061 062 try 063 { 064 if( page != null && engine.pageExists(page) ) 065 { 066 Collection versions = engine.getVersionHistory( page.getName() ); 067 068 if( versions == null ) 069 { 070 // There is no history 071 return SKIP_BODY; 072 } 073 074 m_iterator = versions.iterator(); 075 076 if( m_iterator.hasNext() ) 077 { 078 WikiContext context = (WikiContext)m_wikiContext.clone(); 079 context.setPage( (WikiPage)m_iterator.next() ); 080 pageContext.setAttribute( WikiTagBase.ATTR_CONTEXT, 081 context, 082 PageContext.REQUEST_SCOPE ); 083 pageContext.setAttribute( getId(), 084 context.getPage() ); 085 } 086 else 087 { 088 return SKIP_BODY; 089 } 090 } 091 092 return EVAL_BODY_BUFFERED; 093 } 094 catch( ProviderException e ) 095 { 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 public final int doAfterBody() 104 { 105 if( bodyContent != null ) 106 { 107 try 108 { 109 JspWriter out = getPreviousOut(); 110 out.print(bodyContent.getString()); 111 bodyContent.clearBody(); 112 } 113 catch( IOException e ) 114 { 115 log.error("Unable to get inner tag text", e); 116 // FIXME: throw something? 117 } 118 } 119 120 if( m_iterator != null && m_iterator.hasNext() ) 121 { 122 WikiContext context = (WikiContext)m_wikiContext.clone(); 123 context.setPage( (WikiPage)m_iterator.next() ); 124 pageContext.setAttribute( WikiTagBase.ATTR_CONTEXT, 125 context, 126 PageContext.REQUEST_SCOPE ); 127 pageContext.setAttribute( getId(), 128 context.getPage() ); 129 return EVAL_BODY_BUFFERED; 130 } 131 132 return SKIP_BODY; 133 } 134}