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string translation

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Join Date: Jul 2004

Posts: 6

Reputation: macca1979 is an unknown quantity at this point

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macca1979

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Newbie Poster

string translation

Aug 4th, 2004

Hey there,

First off I'm really new to Java so please bear with me. I need to translate a line of text from one form to another. An example line segment has the following format:

" step(sent(1,A,B,vars(Na,Rv,ped(pk(B),cat(N
a,A)))))"

This means that at step 1, A sends to B that which is contained in vars() i.e. Na, Rv and encryption of Na and A (concatenated) using B's public key [ped(pk(B),cat(Na,A))]

The output format I need is the following:

"Knows_B,time_1(Received(B,time_1,(Na,Rv,enc({Na,A},pk_B))))" (ii)

Basically this is the same information that is in the input format but I just need to translate it to the output format above. From what I've read I think i need to use string tokenisers to separate out the input format and thus build up the output form. However I really am at a loss as to how to begin coding this translation. If anyone has the time could they perhaps give me an example of some code that might solve this problem.
If anyone needs more information regarding the input format and how it's related to the output format I will try and elaborate some more on their connection.

Thanks a million.

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Join Date: Jul 2003

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Reputation: Iron_Cross is an unknown quantity at this point

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Iron_Cross Iron_Cross is offline

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Re: string translation

Aug 4th, 2004

A string tokenizer will separate that long string in an array of small strings.
I.e.
If you had the string "My@Name@Is@bobby@!" (that's not my name btw

) and you set up a string tokenizer to deliminate by @ you'd end up with an array of 5 elements.
"My","Name","is","bobby","!"
Then you could loop through the array trying to match certain cases.

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
import java.util.*;
public class TokenizerTest{
	public static void main(String[] args){
		String input = "step(sent(1,A,B,vars(Na,Rv,ped(pk(B),cat(Na,A)))))" 
		String output = null;
		StringTokenizer st = new StringTokenizer(input,")");
		while(st.hasMoreTokens()){
			if(st.nextToken().equals("some string")){
				// do stuff here
			}
		}
		System.out.println("Output: "+ output);
	}
}
import java.util.*;
public class TokenizerTest{
	public static void main(String[] args){
		String input = "step(sent(1,A,B,vars(Na,Rv,ped(pk(B),cat(Na,A)))))" 
		String output = null;
		StringTokenizer st = new StringTokenizer(input,")");
		while(st.hasMoreTokens()){
			if(st.nextToken().equals("some string")){
				// do stuff here
			}
		}
		System.out.println("Output: "+ output);
	}
}

I'm not sure how the input relates to the output so you can figure that out. But atleast you should know how now. After you tokenize by ")" you'll be left with 8 tokens:
"step"
"sent"
"1,A,B,vars"
"Na,Rv,ped"
"Pk"
"B"
",cat"
"Na,A"

If you want you could deliminate even further by "," but that's up to you.

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