Clean Code

Listing 14-7 (continued)
ArgsException.java

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201
Args: The Rough Draft
Most freshman programmers (like most grade-schoolers) don’t follow this advice par-
ticularly well. They believe that the primary goal is to get the program working. Once it’s
“working,” they move on to the next task, leaving the “working” program in whatever state
they finally got it to “work.” Most seasoned programmers know that this is professional
suicide.
Args: The Rough Draft
Listing 14-8 shows an earlier version of the 
Args
class. It “works.” And it’s messy.
Listing 14-8 
Args.java (first draft)
import java.text.ParseException;
import java.util.*;
public class Args {
private String schema;
private String[] args;
private boolean valid = true;
private Set unexpectedArguments = new TreeSet();
private Map booleanArgs = 
new HashMap();
private Map stringArgs = new HashMap();
private Map intArgs = new HashMap();
private Set argsFound = new HashSet();
private int currentArgument;
private char errorArgumentId = '\0';
private String errorParameter = "TILT";
private ErrorCode errorCode = ErrorCode.OK;
private enum ErrorCode {
OK, MISSING_STRING, MISSING_INTEGER, INVALID_INTEGER, UNEXPECTED_ARGUMENT}
public Args(String schema, String[] args) throws ParseException {
this.schema = schema;
this.args = args;
valid = parse();
}
private boolean parse() throws ParseException {
if (schema.length() == 0 && args.length == 0)
return true;
parseSchema();
try {
parseArguments();
} catch (ArgsException e) {
}
return valid;
}
private boolean parseSchema() throws ParseException {
for (String element : schema.split(",")) {

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202