pageinfolinktag.java

wiki建站资源 java编写的 很好用

/* 
    JSPWiki - a JSP-based WikiWiki clone.

    Copyright (C) 2001-2002 Janne Jalkanen ([e-mail])

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation; either version 2.1 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package com.ecyrd.jspwiki.tags;

import java.io.IOException;
import javax.servlet.jsp.JspWriter;

import com.ecyrd.jspwiki.WikiContext;
import com.ecyrd.jspwiki.WikiEngine;
import com.ecyrd.jspwiki.WikiPage;

/**
 *  Writes a link to the Wiki PageInfo.  Body of the link becomes the actual text.
 *
 *  <P><B>Attributes</B></P>
 *  <UL>
 *    <LI>page - Page name to refer to.  Default is the current page.
 *  </UL>
 *
 *  @author Janne Jalkanen
 *  @since 2.0
 */
// FIXME: Refactor together with LinkToTag and EditLinkTag.
public class PageInfoLinkTag
    extends WikiLinkTag
{
    public final int doWikiStartTag()
        throws IOException
    {
        WikiEngine engine = m_wikiContext.getEngine();
        String     pageName = m_pageName;

        if( m_pageName == null )
        {
            WikiPage p = m_wikiContext.getPage();

            if( p != null )
            {
                pageName = p.getName();
            }
            else
            {
                return SKIP_BODY;
            }
        }

        if( engine.pageExists(pageName) )
        {
            JspWriter out = pageContext.getOut();

            String url = m_wikiContext.getURL( WikiContext.INFO, pageName );

            switch( m_format )
            {
              case ANCHOR:
                out.print("<a class=\"pageinfo\" href=\""+url+"\">");
                break;
              case URL:
                out.print( url );
                break;
            }

            return EVAL_BODY_INCLUDE;
        }

        return SKIP_BODY;
    }
}