shorturlconstructor.java

wiki建站资源 java编写的 很好用

/* 
  JSPWiki - a JSP-based WikiWiki clone.

  Copyright (C) 2001-2005 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.url;

import java.util.Properties;
import java.io.UnsupportedEncodingException;
import java.net.MalformedURLException;
import java.net.URL;

import javax.servlet.http.HttpServletRequest;
import org.apache.log4j.Logger;

import com.ecyrd.jspwiki.InternalWikiException;
import com.ecyrd.jspwiki.TextUtil;
import com.ecyrd.jspwiki.WikiContext;
import com.ecyrd.jspwiki.WikiEngine;


/**
 *  Provides a way to do short URLs of the form /wiki/PageName.
 *
 *  @author Janne Jalkanen
 *
 *  @since 2.2
 */
public class ShortURLConstructor
    extends DefaultURLConstructor
{
    static Logger log = Logger.getLogger( ShortURLConstructor.class );
    
    protected String m_urlPrefix = "";
    
    public static final String PROP_PREFIX = "jspwiki.shortURLConstructor.prefix";
    
    public void initialize( WikiEngine engine, 
                            Properties properties )
    {
        super.initialize( engine, properties );
        
        m_urlPrefix = TextUtil.getStringProperty( properties, PROP_PREFIX, null );
        
        if( m_urlPrefix == null )
        {
            String baseurl = engine.getBaseURL();
            
            if( baseurl == null || baseurl.length() == 0 )
            {
                log.error("Using ShortURLConstructors without jspwiki.baseURL is NOT advised, and can result in trouble.");
                baseurl = "";
            }
            try
            {
                URL url = new URL( baseurl );
            
                String path = url.getPath();
            
                m_urlPrefix = path+"wiki/";
            }
            catch( MalformedURLException e )
            {
                log.error( "Malformed base URL!" );
                m_urlPrefix = "/wiki/"; // Just a guess.
            }
        }

        log.info("Short URL prefix path="+m_urlPrefix+" (You can use "+PROP_PREFIX+" to override this)");
    }

    /**
     *  Constructs the actual URL based on the context.
     */
    private String makeURL( String context,
                            String name,
                            boolean absolute )
    {
        String viewurl = m_urlPrefix+"%n";

        if( absolute ) 
            viewurl = "%u"+m_urlPrefix+"%n";

        if( context.equals(WikiContext.VIEW) )
        {
            if( name == null ) return makeURL("%u","",absolute); // FIXME
            return doReplacement( viewurl, name, absolute );
        }
        else if( context.equals(WikiContext.EDIT) )
        {
            return doReplacement( viewurl+"?do=Edit", name, absolute );
        }
        else if( context.equals(WikiContext.ATTACH) )
        {
            return doReplacement( "%Uattach/%n", name, absolute );
        }
        else if( context.equals(WikiContext.INFO) )
        {
            return doReplacement( viewurl+"?do=PageInfo", name, absolute );
        }
        else if( context.equals(WikiContext.DIFF) )
        {
            return doReplacement( viewurl+"?do=Diff", name, absolute );
        }
        else if( context.equals(WikiContext.NONE) )
        {
            return doReplacement( "%U%n", name, absolute );
        }
        else if( context.equals(WikiContext.UPLOAD) )
        {
            return doReplacement( viewurl+"?do=Upload", name, absolute ); 
        }
        else if( context.equals(WikiContext.COMMENT) )
        {
            return doReplacement( viewurl+"?do=Comment", name, absolute ); 
        }
        else if( context.equals(WikiContext.LOGIN) )
        {
            return doReplacement( viewurl+"?do=Login", name, absolute ); 
        }
        else if( context.equals(WikiContext.ERROR) )
        {
            return doReplacement( "%UError.jsp", name, absolute );
        }
        throw new InternalWikiException("Requested unsupported context "+context);
    }

    /**
     *  Constructs the URL with a bunch of parameters.
     *  @param parameters If null or empty, no parameters are added.
     */
    public String makeURL( String context,
                           String name,
                           boolean absolute,
                           String parameters )
    {
        if( parameters != null && parameters.length() > 0 )
        {            
            if( context.equals(WikiContext.ATTACH) || context.equals(WikiContext.VIEW) )
            {
                parameters = "?"+parameters;
            }
            else
            {
                parameters = "&"+parameters;
            }
        }
        else
        {
            parameters = "";
        }
        return makeURL( context, name, absolute )+parameters;
    }

    /**
     *  Should parse the "page" parameter from the actual
     *  request.
     */
    public String parsePage( String context,
                             HttpServletRequest request,
                             String encoding )
        throws UnsupportedEncodingException
    {
        String pagereq = m_engine.safeGetParameter( request, "page" );

        if( pagereq == null )
        {
            pagereq = parsePageFromURL( request, encoding );
        }

        return pagereq;
    }

    public String getForwardPage( HttpServletRequest req )
    {
        String jspPage = req.getParameter( "do" );
        if( jspPage == null ) jspPage = "Wiki";
    
        return jspPage+".jsp";
    }
}