includetag.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.JspException;
import javax.servlet.ServletException;

import com.ecyrd.jspwiki.providers.ProviderException;

/**
 *  Includes an another JSP page, making sure that we actually pass
 *  the WikiContext correctly.
 *
 *  @author Janne Jalkanen
 *  @since 2.0
 */
// FIXME: Perhaps unnecessary?
public class IncludeTag
    extends WikiTagBase
{
    protected String m_page;

    public void setPage( String page )
    {
        m_page = page;
    }

    public String getPage()
    {
        return m_page;
    }

    public final int doWikiStartTag()
        throws IOException,
               ProviderException
    {
        // WikiEngine engine = m_wikiContext.getEngine();

        return SKIP_BODY;
    }

    public final int doEndTag()
        throws JspException
    {
        try
        {
            String page = m_wikiContext.getEngine().getTemplateManager().findJSP( pageContext,
                                                                                  m_wikiContext.getTemplate(),
                                                                                  m_page );
            pageContext.include( page );
        }
        catch( ServletException e )
        {
            log.warn( "Including failed, got a servlet exception from sub-page. "+
                      "Rethrowing the exception to the JSP engine.", e );
            throw new JspException( e.getMessage() );
        }
        catch( IOException e )
        {
            log.warn( "I/O exception - probably the connection was broken. "+
                      "Rethrowing the exception to the JSP engine.", e );
            throw new JspException( e.getMessage() );
        }

        return EVAL_PAGE;
    }
}