source: proiecte/ptvs/src/vnsim/applications/vitp/utils/URIParser.java @ 31

/************************************************************************************
 * Copyright (C) 2008 by Politehnica University of Bucharest and Rutgers University
 * All rights reserved.
 * Refer to LICENSE for terms and conditions of use.
 ***********************************************************************************/
package vnsim.applications.vitp.utils;

import java.util.*;

public class URIParser {
        //this class contains static methods, that help parsing a URI;

        //URI Format: "/type/tag?[cnt=*&tout=*]&param1=*&param2=*..."

        //all the methods return null if the format of the URI is wrong

        public static String getType(String uri) {
                if(uri==null) return null;
                if(!uri.startsWith("/")) return null;
                int i1=uri.indexOf('/',1);
                if(i1==-1) return null;
                return uri.substring(1,i1);
        }

        public static String getTag(String uri) {
                if(uri==null) return null;
                if(!uri.startsWith("/")) return null;
                int i1=uri.indexOf('/',1);
                if(i1==-1) return null;
                int i2=uri.indexOf('?',i1);
                if(i2==-1) return uri.substring(i1+1);
                return uri.substring(i1+1,i2);
        }

        public static Vector<String> getRCExpressions(String uri){
                //returns a vector of all expressions within the brackets;
                //the corresponding service should do more parsing inside
                //each expression, since it could have particular formats
                //(e.g with < > *)

                if(uri==null) return null;
                if(!uri.startsWith("/")) return null;
                int i1=uri.indexOf('/',1);
                if(i1==-1) return null;
                int i2=uri.indexOf('?',i1);
                if(i2==-1) return null;
                if(uri.charAt(i2+1)!='[') return null;
                int index=i2+2;
                int finIndex=uri.indexOf(']',index);
                if(finIndex==-1) return null;
                String rcs=uri.substring(index,finIndex);
                Vector<String> ret=new Vector<String>();
                StringTokenizer st=new StringTokenizer(rcs,"&");
                while(st.hasMoreTokens()) {
                        ret.addElement(st.nextToken());
                }
                return ret;
        }

        public static Vector<String> getParams(String uri){
                //returns the parameters after the [] as a vector of Strings
                //the corresponding service should do more parsing inside
                //each expression, since it could have particular formats
                //(e.g with < > *)
                if(uri==null) return null;
                if(!uri.startsWith("/")) return null;
                int i1=uri.indexOf('/',1);
                if(i1==-1) return null;
                i1=uri.indexOf('?',i1);
                if(i1==-1) return null;
                i1=uri.indexOf('[',i1);
                if(i1==-1) return null;
                i1=uri.indexOf(']',i1);
                if(i1==-1) return null;
                Vector<String> ret=new Vector<String>();
                i1++;
                if(i1>=uri.length()) return ret;
                if(uri.charAt(i1)!='&') return null;
                StringTokenizer st=new StringTokenizer(uri.substring(i1),"&");
                while(st.hasMoreTokens()) {
                        ret.addElement(st.nextToken());
                }
                return ret;
        }

        public static String getURIFromParts(String type, String tag, Vector h1, Vector h2){
                if(type==null || tag==null || h1==null || h2==null)
                        return null;
                String ret="/"+type+"/"+tag+"?[";
                for(int i=0;i<h1.size();i++) {
                        ret=ret+((String)h1.elementAt(i));
                        if(i<h1.size()-1)
                                ret=ret+"&";
                }
                ret=ret+"]";
                for(int i=0;i<h2.size();i++) {
                        ret=ret+"&"+((String)h2.elementAt(i));
                }
                return ret;
        }
}