plugintag.java

JSPWiki,100%Java开发的一套完整WIKI程序

/* 
    JSPWiki - a JSP-based WikiWiki clone.

    Copyright (C) 2001-2004 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 java.util.Map;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.tagext.BodyContent;
import javax.servlet.jsp.tagext.BodyTagSupport;

import org.apache.log4j.Logger;

import com.ecyrd.jspwiki.WikiEngine;
import com.ecyrd.jspwiki.WikiContext;
import com.ecyrd.jspwiki.plugin.PluginManager;
import com.ecyrd.jspwiki.plugin.PluginException;

/**
 *  Inserts any Wiki plugin.  The body of the tag becomes then
 *  the body for the plugin.
 *  <P><B>Attributes</B></P>
 *  <UL>
 *    <LI>plugin - name of the plugin you want to insert.
 *    <LI>args   - An argument string for the tag.
 *  </UL>
 *  @author Janne Jalkanen
 *  @since 2.0
 */
public class PluginTag
    extends BodyTagSupport
{
    private String m_plugin;
    private String m_args;

    protected WikiContext m_wikiContext;

    static Logger log = Logger.getLogger( PluginTag.class );

    public void setPlugin( String p )
    {
        m_plugin = p;
    }

    public void setArgs( String a )
    {
        m_args = a;
    }
    
    public int doAfterBody()
        throws JspException
    {
        try
        {
            m_wikiContext = (WikiContext) pageContext.getAttribute( WikiTagBase.ATTR_CONTEXT,
                                                                    PageContext.REQUEST_SCOPE );
            WikiEngine engine = m_wikiContext.getEngine();

            PluginManager pm  = engine.getPluginManager();

            Map argmap = pm.parseArgs( m_args );
            
            BodyContent bc = getBodyContent();
            if( bc != null ) 
            {
                argmap.put( "_body", bc.getString() );
            }

            String result = pm.execute( m_wikiContext, m_plugin, argmap );

            pageContext.getOut().write( result );
        
            return SKIP_BODY;
        }
        catch( Exception e )
        {
            log.error( "Failed to insert plugin", e );
            throw new JspException( "Tag failed, check logs: "+e.getMessage() );
        }
    }
}