Responder.java

package com.core;

public enum Response {
    BYE("(?i)^b(ye)?\\s*", (i, s) -> {
        Printer.printString("Bye. Hope to see you again soon!");
        s.toExit = true;
        s.lastError = false;
        return true;
    }),
    RESPONDER_NAME("regex", (commandInput, programState) -> {
        // carry out command
        return true; // capture is valid, end checking other commands
        return false; // even though match, keep checking other commands match
    });

    private String regex;
    private ResponseFunc func;

    Response(String r, ResponseFunc f) {
        regex = r;
        func = f;
    }

    /**
     * Given a string and program state, if string matches regex this enum will call its response
     * function.
     *
     * @param i input string
     * @param s state object
     * @return boolean if the string has matched
     */
    public boolean call(String i, State s) {
        if (i.matches(regex)) {
            return func.funcCall(i, s);
        }
        return false;
    }
}