chat2.java

/**
 * A program to carry on conversations with a human user.
 * This is the initial version that:  
 * <ul><li>
 *       Uses indexOf to find strings
 * </li><li>
 *          Handles responding to simple words and phrases 
 * </li></ul>
 * This version uses a nested if to handle default responses.
 * @author Laurie White
 * @version April 2012
 */
public class Magpie2
{
    /**
     * Get a default greeting   
     * @return a greeting
     */
    public String getGreeting()
    {
        return "Hello, let's talk.";
    }

    /**
     * Gives a response to a user statement
     * 
     * @param statement
     *            the user statement
     * @return a response based on the rules given
     */
    public String getResponse(String statement)
    {
        String response = "";
        if (statement.indexOf("no") >= 0 && alone(statement, "no") == true)
        {

            response = "Why so negative?";
        }else if (statement.indexOf("I want") >= 0){
            
            response = "Whould you really be happy if you had " +
            statement.substring(statement.indexOf("I want") + 7, statement.length()) + "?";

        }else if(statement.indexOf("I") >= 0 &&
        statement.indexOf("I") < statement.indexOf("you") &&
        alone(statement, "I") == true && alone(statement, "you") == true){
            response = "Why do you " + 
            statement.substring(statement.indexOf("I") + 2, statement.indexOf("you") - 1)
            + " me";
        }
        else if (statement.indexOf("mother") >= 0
        || statement.indexOf("father") >= 0
        || statement.indexOf("sister") >= 0
        || statement.indexOf("brother") >= 0)

        {
            if(alone(statement, "mother") == true || alone(statement, "father") == true
            || alone(statement, "sister") == true || alone(statement, "brother") == true){
                response = "Tell me more about your family.";
            }else{
                response = getRandomResponse();
            }
        }else if (statement.indexOf("cat") >= 0 
        || statement.indexOf("dog") >= 0){
            if(alone(statement, "cat") == true || alone(statement, "dog") == true){
                response = "Tell me more about your pets.";
            }else{
                response = getRandomResponse();
            }
        }else if (statement.indexOf("Mr. ") >= 0
        && alone(statement, "Mr.") == true){
            response = "He sounds like a good teacher.";

        }else if (statement.indexOf("Mrs. ") >= 0
        && alone(statement, "Mrs.") == true){
            response = "She sounds like a good teacher.";

        }else if (statement.indexOf("Ms. ") >= 0
        && alone(statement, "Ms.") == true){
            response = "She sounds like a good teacher.";

        }else if (statement.indexOf("Boo!") >= 0
        && alone(statement, "Boo!") == true){
            response = "Ahh!";

        }else if (statement.indexOf("food") >= 0
        && alone(statement, "food") == true){
            response = "Can I have some?";

        }else if (statement.indexOf("car") >= 0
        && alone(statement, "car") == true){
            response = "Are you going out?";

        }
        else
        {
            response = getRandomResponse();
        }
        return response;
    }
    /**
     * Pick a default response to use if nothing else fits.
     * @return a non-committal string
     */
    private String getRandomResponse()
    {
        final int NUMBER_OF_RESPONSES = 4;
        double r = Math.random();
        int whichResponse = (int)(r * NUMBER_OF_RESPONSES);
        String response = "";

        if (whichResponse == 0)
        {
            response = "Interesting, tell me more.";
        }
        else if (whichResponse == 1)
        {
            response = "Hmmm.";
        }
        else if (whichResponse == 2)
        {
            response = "Do you really think so?";
        }
        else if (whichResponse == 3)
        {
            response = "You don't say.";
        }

        return response;
    }
    //
    private boolean alone(String statement, String keyWord)
    {
        boolean start = false;
        boolean finish = false;
        if(statement.indexOf(keyWord) - 1 >= 0){
            if(statement.substring(statement.indexOf(keyWord)-1, statement.indexOf(keyWord)).equals(" ")){
                start = true;
            }
        }else{
            start = true;
        }
        if(statement.indexOf(keyWord) + keyWord.length() < statement.length()){
            if(statement.substring(statement.indexOf(keyWord) + keyWord.length(), statement.indexOf(keyWord) + keyWord.length() + 1).equals(" ")){
                finish = true;
            }
        }else{
            finish = true;
        }
        if(finish == true && start == true){
            return true;
        }else{
            return false;
        }
        /*
        if(statement.indexOf(keyWord) == 0){
        if(statement.substring(keyWord.length(),keyWord.length()+1).equals(" ")){
        return true;
        }else{
        return false;
        }
        }else if(statement.indexOf(keyWord) + keyWord.length() == statement.length()){
        return true;
        }else if (statement.substring(statement.indexOf(keyWord), statement.indexOf(keyWord)+1).equals(" ")
        && statement.substring(statement.indexOf(keyWord) + keyWord.length(), statement.indexOf(keyWord) + keyWord.length()+1).equals(" ")){
        return true;
        }else{
        return false;}*/
    }
}