Main.java

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public class Main {

    public static void main(String[] args) {
        boolean isNs2 = false;
        boolean isAnsim = false;
        // choose one of two possible actions
        for (String arg: args) {
            // convert to ns2
            if ("ns2".equals(arg.toLowerCase())) {
                isNs2    = true;
            }
            // convert to ansim
            if ("ansim".equals(arg.toLowerCase())) {
                isAnsim = true;
            }
        }
        
        if ( (isNs2 || isAnsim) == false ) {
            // no target selected
            System.err.println("Which target wanted? => [ns2|ansim]");
            System.exit(1);
        }
        
        if ( (isNs2 && isAnsim) == true) {
            // two targets selected
            System.err.println("Which target wanted? => [ns2|ansim]");
            System.exit(1);         
        }
        
        if (isNs2) {
            // convert!
            ns2.Converter.convert(args);
        } else if (isAnsim) {
            ansim.Converter.convert(args);
        }
    }
}