Interacting with the Environment - Java - page 77

optarg = null null ;

}

/**
* Modern way of using GetOpt: call this once and get all options.
* <p>
* This parses the options, returns a Map whose keys are the found options.
* Normally followed by a call to getFilenameList().
* <br>Side effect: sets "fileNameArguments" to a new List
* @return a Map whose keys are Strings of length 1 (containing the char
* from the option that was matched) and whose value is a String
* containing the value, or null for a non-option argument.
*/
public public Map < String , String > parseArguments ( String [] argv ) {

Map < String , String > optionsValueMap = new new HashMap < String , String >();

fileNameArguments = new new ArrayList < String >();

for for ( int int i = 0 ; i < argv . length ; i ++) { // Cannot use foreach, need i

Debug . println ( "getopt" , "parseArg: i=" + i + ": arg " + argv [ i ]);
char

char c = getopt ( argv ); // sets global "optarg"

iif ( c == DONE ) {
fileNameArguments . add ( argv [ i ]);
} else

else {
optionsValueMap . put ( Character . toString ( c ), optarg );
// If this arg takes an option, must arrange here to skip it.
iif ( optarg != null null ) {

i ++;

}

}

}
return

return optionsValueMap ;

}

/** Get the list of filename-like arguments after options;
* only for use if you called parseArguments.
*/
public public List < String > getFilenameList () {

iif ( fileNameArguments == null

null ) {

throw throw new new IllegalArgumentException (

"Illegal call to getFilenameList() before parseOptions()" );

}
return

return fileNameArguments ;

}

/** The true heart of getopt, whether used old way or new way:
* returns one argument; call repeatedly until it returns DONE.
* Side-effect: sets globals optarg, optind