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 */ 019 package org.apache.wiki.tags; 020 021 import java.io.IOException; 022 023 import javax.servlet.jsp.JspWriter; 024 025 import org.apache.wiki.InternalWikiException; 026 import org.apache.wiki.WikiContext; 027 import org.apache.wiki.WikiPage; 028 029 /** 030 * Writes a comment link. Body of the link becomes the link text. 031 * <P><B>Attributes</B></P> 032 * <UL> 033 * <LI>page - Page name to refer to. Default is the current page. 034 * <LI>format - Format, either "anchor" or "url". 035 * </UL> 036 * 037 * @since 2.0 038 */ 039 public class CommentLinkTag 040 extends WikiLinkTag 041 { 042 private static final long serialVersionUID = 0L; 043 044 /** 045 * {@inheritDoc} 046 */ 047 @Override 048 public final int doWikiStartTag() 049 throws IOException 050 { 051 WikiPage page = null; 052 String pageName = null; 053 054 // 055 // Determine the page and the link. 056 // 057 if( m_pageName == null ) 058 { 059 page = m_wikiContext.getPage(); 060 if( page == null ) 061 { 062 // You can't call this on the page itself anyways. 063 return SKIP_BODY; 064 } 065 066 pageName = page.getName(); 067 } 068 else 069 { 070 pageName = m_pageName; 071 } 072 073 // 074 // Finally, print out the correct link, according to what 075 // user commanded. 076 // 077 JspWriter out = pageContext.getOut(); 078 079 switch( m_format ) 080 { 081 case ANCHOR: 082 out.print("<a href=\""+getCommentURL(pageName)+"\">"); 083 break; 084 085 case URL: 086 out.print( getCommentURL(pageName) ); 087 break; 088 089 default: 090 throw new InternalWikiException("Impossible format "+m_format); 091 092 } 093 094 return EVAL_BODY_INCLUDE; 095 } 096 097 private String getCommentURL( String pageName ) 098 { 099 return m_wikiContext.getURL(WikiContext.COMMENT, pageName); 100 } 101 102 }