pagetypetag.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 com.ecyrd.jspwiki.WikiEngine;
import com.ecyrd.jspwiki.WikiPage;
import com.ecyrd.jspwiki.attachment.Attachment;

/**
 *  Includes the body, if the current page is of proper type.
 *
 *  <B>Attributes</B>
 *  <UL>
 *   <LI>type - either "page", "attachment" or "weblogentry"
 *  </UL>
 *
 *  @author Janne Jalkanen
 *  @since 2.0
 */
public class PageTypeTag
    extends WikiTagBase
{
    private String m_type;

    public void setType( String arg )
    {
        m_type = arg.toLowerCase();
    }

    public final int doWikiStartTag()
        throws IOException
    {
        WikiEngine engine = m_wikiContext.getEngine();
        WikiPage   page   = m_wikiContext.getPage();

        if( page != null )
        {
            if( m_type.equals("attachment") && page instanceof Attachment )
            {
                return EVAL_BODY_INCLUDE;
            }
            
            if( m_type.equals("page") && !(page instanceof Attachment) )
            {
                return EVAL_BODY_INCLUDE;
            }

            if( m_type.equals("weblogentry") && !(page instanceof Attachment) && page.getName().indexOf("_blogentry_") != -1 )
            {
                return EVAL_BODY_INCLUDE;
            }
        }

        return SKIP_BODY;
    }
}