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;
    }

    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 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);
            case MISSING_DOUBLE:
                return String.format("Could not find double parameter for -%c.",
                errorArgumentId);
            }
    return ""; 
}
public enum ErrorCode {
    OK, INVALID_FORMAT, UNEXPECTED_ARGUMENT, INVALID_ARGUMENT_NAME, MISSING_STRING,
    MISSING_INTEGER, INVALID_INTEGER,
    MISSING_DOUBLE, INVALID_DOUBLE
    }
    
}