counter.java

wiki建站资源 java编写的 很好用

/* 
    JSPWiki - a JSP-based WikiWiki clone.

    Copyright (C) 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.plugin;

import org.apache.log4j.Logger;
import com.ecyrd.jspwiki.*;
import java.util.*;

/**
 *  Provides a page-specific counter.
 *  <P>Parameters
 *  <UL>
 *    <LI>name - Name of the counter.  Optional.
 *  </UL>
 *
 *  Stores a variable in the WikiContext called "counter", with the name of the
 *  optionally attached.  For example:<BR>
 *  If name is "thispage", then the variable name is called "counter-thispage".
 *
 *  @since 1.9.30
 *  @author Janne Jalkanen
 */
public class Counter
    implements WikiPlugin
{
    private static Logger log = Logger.getLogger( Counter.class );

    static final String VARIABLE_NAME = "counter";

    public String execute( WikiContext context, Map params )
        throws PluginException
    {
        //
        //  First, determine which kind of name we use to store in
        //  the WikiContext.
        //
        String  countername = (String)params.get( "name" );

        if( countername == null ) 
        {
            countername = VARIABLE_NAME;
        }
        else
        {
            countername = VARIABLE_NAME+"-"+countername;
        }

        //
        //  Fetch, increment, and store back.
        //
        Integer val = (Integer)context.getVariable( countername );

        if( val == null )
        {
            val = new Integer( 0 );
        }

        val = new Integer( val.intValue() + 1 );

        context.setVariable( countername, val );

        return val.toString();
    }

}