How to get specific substring with option vale using java

Question

I have a string and from this string, I want to get password file path which is identified by an option (-sn).

String s = "msqlsum81pv 0 0 25 25 25 2  -sn D:\workdir\PV_81\config\sum81pv.pwf -C 5000"

above line is a configuration line which can be with either -sn or -n. please suggest how to get D:\workdir\PV_81\config\sum81pv.pwf line from above string or the string may be with quoted string.

below is my code which check only -sn option but I want to check with either -sn or -n .

if ( s.matches( "^\\s*msql.*$" ) ) 
 {
   StringTokenizer st = new StringTokenizer( s, " " );
   while ( st.hasMoreTokens() )
   {
     if ( st.nextToken().equals( "-sn" ) )
     {
       pwf = st.nextToken();
     }
   }
}

I want to use StreamTokenizer instead of StringTokenizer class and get D:\workdir\PV_81\config\sum81pv.pwf

this path may be containing spaces in it.

String s = "msqlsum81pv 0 0 25 25 25 2  -sn D:\workdir\PV_81\config\sum81pv.pwf -C 5000"



if ( s.matches( "^\\s*msql.*$" ) ) 
 {
   StreamTokenizer tokenizer = new StreamTokenizer(new StringReader(s));
   while (tokenizer.nextToken() != StreamTokenizer.TT_EOF) 
    {

       System.out.println(tokenizer.sval);
    }
}

Answer 1

You should use a regular expression to detect that option in a more general way. If you want a quick fix you can use the OR operator in your if but each time that new operations appear your if will grow and it's a bad idea.

if ( s.matches( "^\\s*msql.*$" ) ) 
 {
   StringTokenizer st = new StringTokenizer( s, " " );
   while ( st.hasMoreTokens() )
   {
     string token = st.nextToken();
     if ( token.equals( "-sn" ) || token.equals("-n" ) )
     {
       pwf = st.nextToken();
     }
   }
}