URLHandlerTree.java
上传用户:huihesys
上传日期:2007-01-04
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文件大小:3k
- /* CVS ID: $Id: URLHandlerTree.java,v 1.2 2000/04/06 08:02:02 wastl Exp $ */
- package net.wastl.webmail.server;
- import java.util.*;
- /*
- * URLHandlerTree.java
- *
- * Created: Thu Sep 2 13:20:23 199
- *
- * Copyright (C) 1999-2000 Sebastian Schaffert
- *
- * 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.
- */
- /**
- * A tree structure to improve (speed up) access to URLs
- *
- * @author Sebastian Schaffert
- * @version
- */
- public class URLHandlerTree implements URLHandlerTreeNode {
-
- URLHandler handler;
- String url;
- Hashtable nodes;
-
- StringTokenizer t;
- public URLHandlerTree(String url) {
- nodes=new Hashtable();
- this.url=url;
- }
-
- public String getURL() {
- return url;
- }
- public void addHandler(String url, URLHandler h) {
- if(url.equals("/") || url.equals("") || url==null) {
- handler=h;
- } else {
- t=new StringTokenizer(url,"/");
- String subtree_name=t.nextToken();
- URLHandlerTree subtree=(URLHandlerTree)nodes.get(subtree_name);
- if(subtree == null) {
- if(this.url.endsWith("/")) {
- subtree=new URLHandlerTree(this.url+subtree_name);
- } else {
- subtree=new URLHandlerTree(this.url+"/"+subtree_name);
- }
- nodes.put(subtree_name,subtree);
- }
- subtree.addHandler(url.substring(subtree_name.length()+1,url.length()),h);
- }
- }
-
- public URLHandler getHandler(String url) {
- if(url.equals("/") || url.equals("") || url==null) {
- /* We are the handler */
- return handler;
- } else {
- t=new StringTokenizer(url,"/");
- String subtree_name=t.nextToken();
- URLHandlerTree subtree=(URLHandlerTree)nodes.get(subtree_name);
- if(subtree == null) {
- /* If there is no subtree, we are the handler! */
- return handler;
- } else {
- /* Else there is a subtree*/
- URLHandler uh=subtree.getHandler(url.substring(subtree_name.length()+1,url.length()));
- if(uh != null) {
- /* It has a handler */
- return uh;
- } else {
- /* It has no handler, we are handler */
- return handler;
- }
- }
- }
- }
-
- public String toString() {
- return nodes.toString();
- }
- } // URLHandlerTree