template.java

使用工具jublider开发的一个聊天室实现基本功能,

/**
 * Copyright (C) 2003  Manfred Andres
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * 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 General Public License for more details.
 * 
 * You should have received a copy of the GNU 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 freecs.layout;

import freecs.Server;
import freecs.commands.AbstractCommand;
import freecs.commands.CommandSet;
import freecs.content.MessageState;
import freecs.core.*;
import freecs.util.FileMonitor;
import freecs.interfaces.IReloadable;
import freecs.interfaces.IRequest;

import java.io.*;
import java.util.*;

public class Template implements IReloadable {
    private static final int DEPENDS_ON_NOTHING         = 0;
    private static final int DEPENDS_ON_SERVER_CONFIG   = 1;
    private static final int DEPENDS_ON_USER_COUNT      = 2;
    private static final int DEPENDS_ON_GROUP_COUNT     = 4;
    private static final int DEPENDS_ON_GROUP_LIST      = 8;
    private static final int DEPENDS_ON_SESSION         =16;
    private int dependsOn=DEPENDS_ON_NOTHING;

    private volatile String eTag=null;
    private volatile long modifiedSince=0;
    
    private volatile String[] parts;
    private String tsName;
    private String name;
    private boolean isRedirect;
    private String destination;
    private TemplateSet ts;

    private File template;
    private long lastModified;
    private boolean tplPresent;

    public String getDestination () {
        return destination;
    }

   public boolean isRedirect () {
      return isRedirect;
   }

   public String getTsName () {
      return tsName;
   }

   public boolean hasToBeRendered (String eTag, long modifiedSince) {
       if (eTag==null && modifiedSince==-1)
           return true;
       if (eTag != null) {
           this.eTag = this.generateETag();
           if ((this.dependsOn & Template.DEPENDS_ON_SESSION)!=0
               || !eTag.equals(this.eTag)) // FIXME: if-not-match may transfere more than one etag
               return true;
       } else if (this.modifiedSince>modifiedSince)
           return true;
       return false;
   }

   public String render (IRequest req) {
/*      StringBuffer tsb = new StringBuffer ("rendering Template ").append (name).append (" of templateset ").append (tsName);
      Server.log (this, tsb.toString (), Server.MSG_STATE, Server.LVL_VERY_VERBOSE); */
      StringBuffer retVal = new StringBuffer ();
      for (int i = 0; i < parts.length; i++) {
         String part = parts[i];
         if (!part.startsWith ("#")) {
            retVal.append (part);
            continue;
         }
         if (part.regionMatches 
                 (true, 0, "#active_users", 0, "#active_users".length())) {
            retVal.append (UserManager.mgr.getActiveUserCount ());
         } else if (part.regionMatches 
                 (true, 0, "#active_user_list", 0, "#active_user_list".length())) {
             retVal.append(generateUserList());
         } else if (part.regionMatches 
                 (true, 0, "#users_in_group", 0, "#users_in_group".length())) {
             retVal.append (generateUserList(req));
         } else if (part.regionMatches 
                 (true, 0, "#open_groups", 0, "#open_groups".length())) {
         	retVal.append (GroupManager.mgr.openGroupsCount()); 
         } else if (part.regionMatches 
                 (true, 0, "#selve", 0, "#selve".length())) {
         	retVal.append ("http://");
            retVal.append (Server.srv.getUrl ());
         } else if (part.regionMatches 
                 (true, 0, "#token", 0, "#token".length())) {
			StringBuffer c = new StringBuffer ();
			while (c.length () < 16) {
			   char x = (char) Math.ceil(Math.random() * 34);
			   if (x < 10) x = (char) (x + 48);
			   else        x = (char) (x + 87);
			   c.append(x);
			}
			retVal.append (c);
			Server.srv.addToken(c.toString(), req.getCookie());
         } else if (part.regionMatches 
                 (true, 0, "#config.", 0, "#config.".length())) {
             retVal.append(Server.srv.props.getProperty(part.substring(8).trim()));
         }
      }
      String[] arr = new String[2];
      return retVal.toString();
   }

   private String generateETag() {
       if ((this.dependsOn & Template.DEPENDS_ON_SESSION) != 0)
           return null;
       if (modifiedSince < this.lastModified)
           modifiedSince = this.lastModified;
       StringBuffer sb = new StringBuffer();
       sb.append (Long.toHexString(this.lastModified/500));
       if ((this.dependsOn & Template.DEPENDS_ON_SERVER_CONFIG) != 0) {
           sb.append ("pc").append(Long.toHexString(Server.srv.lastModified()/500));
           if (modifiedSince < Server.srv.lastModified())
               modifiedSince = Server.srv.lastModified();
       }
       if ((this.dependsOn & Template.DEPENDS_ON_USER_COUNT) != 0) {
           sb.append ("puc").append(Long.toHexString(UserManager.mgr.lastModified()/500));
           if (modifiedSince < UserManager.mgr.lastModified())
               modifiedSince = UserManager.mgr.lastModified();
       }
       if ((this.dependsOn & Template.DEPENDS_ON_GROUP_COUNT) != 0) {
           sb.append ("pgc").append(Long.toHexString(GroupManager.mgr.lastModified()/500));
           if (modifiedSince < GroupManager.mgr.lastModified())
               modifiedSince = GroupManager.mgr.lastModified();
       }
       if ((this.dependsOn & Template.DEPENDS_ON_GROUP_LIST) != 0) {
           sb.append ("pgl").append(Long.toHexString(GroupManager.mgr.groupListLastModified()/500));
           if (modifiedSince < GroupManager.mgr.groupListLastModified())
               modifiedSince = GroupManager.mgr.groupListLastModified();
       }
       return sb.toString();
   }
   
   public String getName () {
      return name;
   }

	public Template(File tpl, TemplateSet ts) throws IOException {
		this.tsName = ts.getName();
		this.ts = ts;
		template = tpl;
		name = tpl.getName ();
		int pos = name.indexOf (".");
		if (pos != -1)
	   	name = name.substring (0, pos);
      	lastModified = tpl.lastModified ();
      	parts = parseFile(tpl);
      	tplPresent=true;
      	FileMonitor.getFileMonitor ().addReloadable (this);
	}

   public boolean isValide () {
      return ((parts != null && parts.length > 0) ||
              (destination != null && destination.length() > 1 && isRedirect == true));
   }

   private String[] parseFile(File tpl) throws IOException {
      if (!tpl.canRead()) {
         StringBuffer tsb = new StringBuffer ("Unable to read template '").append (tpl.getName()).append ("'");
         throw new IOException(tsb.toString ());
      }
      this.dependsOn = Template.DEPENDS_ON_NOTHING;

      Vector t = new Vector ();
      FileReader fr = new FileReader(tpl);
      char fcnt[] = new char[(int) tpl.length()];
      int read = fr.read(fcnt);
      if (read<1) return null;
      String raw = String.copyValueOf(fcnt);
      if (raw.toLowerCase ().startsWith ("#redirect#")) {
         this.isRedirect = true;
         destination = raw.substring (raw.lastIndexOf("#") + 1).trim ();
         if (destination.toLowerCase ().startsWith ("$selve$")) {
            StringBuffer tsb = new StringBuffer ("http://").append (Server.srv.getUrl ());
            destination = tsb.toString ();
            this.dependsOn = this.dependsOn | Template.DEPENDS_ON_SERVER_CONFIG;
         } else if (!destination.toLowerCase ().startsWith ("http://")) {
            StringBuffer tsb = new StringBuffer ("http://").append (destination);
            destination = tsb.toString ();
         }
      }

      boolean lt=false, placeholder=false;
      StringTokenizer tok = new StringTokenizer (raw, "<%>", true);