Clean Code

Listing 14-15 
ArgsException.java
public class ArgsException extends Exception {
private char errorArgumentId = '\0';
private String errorParameter = "TILT";
private ErrorCode errorCode = ErrorCode.OK;
public ArgsException() {}
public ArgsException(String message) {super(message);}
public ArgsException(ErrorCode errorCode) {
this.errorCode = errorCode;
}
Listing 14-14 (continued)
ArgsExceptionTest.java

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246
Chapter 14: Successive Refinement
public ArgsException(ErrorCode errorCode, String errorParameter) {
this.errorCode = errorCode;
this.errorParameter = errorParameter;
}
public ArgsException(ErrorCode errorCode, char errorArgumentId, 
String errorParameter) {
this.errorCode = errorCode;
this.errorParameter = errorParameter;
this.errorArgumentId = errorArgumentId;
}
public char getErrorArgumentId() {
return errorArgumentId;
}
public void setErrorArgumentId(char errorArgumentId) {
this.errorArgumentId = errorArgumentId;
}
public String getErrorParameter() {
return errorParameter;
}
public void setErrorParameter(String errorParameter) {
this.errorParameter = errorParameter;
}
public ErrorCode getErrorCode() {
return errorCode;
}
public void setErrorCode(ErrorCode errorCode) {
this.errorCode = errorCode;
}
public String errorMessage() throws Exception {
switch (errorCode) {
case OK:
throw new Exception("TILT: Should not get here.");
case UNEXPECTED_ARGUMENT:
return String.format("Argument -%c unexpected.", errorArgumentId);
case MISSING_STRING:
return String.format("Could not find string parameter for -%c.", 
errorArgumentId);
case INVALID_INTEGER:
return String.format("Argument -%c expects an integer but was '%s'.", 
errorArgumentId, errorParameter);
case MISSING_INTEGER:
return String.format("Could not find integer parameter for -%c.", 
errorArgumentId);
case INVALID_DOUBLE:
return String.format("Argument -%c expects a double but was '%s'.", 
errorArgumentId, errorParameter);