ansim/Parser.java

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package ansim;

import ansim.Parameter;

public class Parser {
    public static Parameter parse(String[] args) throws IllegalArgumentException {
        String net   = "";
        String trace = "";
        String out   = "";
        
        boolean hasNet   = false;
        boolean hasTrace = false;
        boolean hasOut   = false;
        
        for (int i=0; i<args.length; i++) {
            if ("ns2".equals(args[i].toLowerCase())) {
            }
            
            if ("-n".equals(args[i])) {
                // net file
                if (++i<args.length) {
                    if (!args[i].startsWith("-")) {
                        net = args[i];
                        hasNet = true;
                    }
                }
            }
            
            if ("-t".equals(args[i])) {
                // trace file
                if (++i<args.length) {
                    if (!args[i].startsWith("-")) {
                        trace = args[i];
                        hasTrace = true;
                    }
                }
            }
            
            if ("-o".equals(args[i])) {
                // out file
                if (++i<args.length) {
                    if (!args[i].startsWith("-")) {
                        out = args[i];
                        hasOut = true;
                    }
                }
            }
        }
        
        // must have net file argument
        if (!hasNet) {
            throw new IllegalArgumentException("no netfile specified!");
        }
        
        // must have trace file argument
        if (!hasTrace) {
            throw new IllegalArgumentException("no tracefile specified!");
        }
        
        // must have out file argument
        if (!hasOut) {
            throw new IllegalArgumentException("no outfile specified!");
        }
                
        return new Parameter(net, trace, out);
    }
}