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.wiki.InternalWikiException; 022import org.apache.wiki.api.core.ContextEnum; 023import org.apache.wiki.api.core.Page; 024 025import javax.servlet.jsp.JspWriter; 026import java.io.IOException; 027 028 029/** 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 */ 039public 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() throws IOException { 049 final Page page; 050 final String pageName; 051 052 // Determine the page and the link. 053 if( m_pageName == null ) { 054 page = m_wikiContext.getPage(); 055 if( page == null ) { 056 // You can't call this on the page itself anyways. 057 return SKIP_BODY; 058 } 059 pageName = page.getName(); 060 } else { 061 pageName = m_pageName; 062 } 063 064 // Finally, print out the correct link, according to what user commanded. 065 final JspWriter out = pageContext.getOut(); 066 switch( m_format ) { 067 case ANCHOR: out.print( "<a href=\"" + getCommentURL( pageName ) + "\">" ); break; 068 case URL: out.print( getCommentURL( pageName ) ); break; 069 default: throw new InternalWikiException( "Impossible format " + m_format ); 070 } 071 072 return EVAL_BODY_INCLUDE; 073 } 074 075 private String getCommentURL( final String pageName ) { 076 return m_wikiContext.getURL( ContextEnum.PAGE_COMMENT.getRequestContext(), pageName ); 077 } 078 079}