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/*
 * JCaptcha, the open source java framework for captcha definition and integration
 * Copyright (c)  2007 jcaptcha.net. All Rights Reserved.
 * See the LICENSE.txt file distributed with this package.
 */

package com.octo.captcha.text.math;

import com.octo.captcha.text.TextCaptcha;

/**
 * Simple math captcha
 *
 * @author Marc-Antoine Garrigue
 * @version 1.0
 */
public class MathCaptcha extends TextCaptcha {

	private String response;

    MathCaptcha(String question, String challenge, String response) {
        super(question, challenge);
        this.response = response;
    }

    /**
     * Validation routine from the CAPTCHA interface. this methods verify if the response is not null and a String and
     * then compares the given response to the internal string.
     *
     * @return true if the given response equals the internal response, false otherwise.
     */
    public final Boolean validateResponse(final Object response) {
        return (null != response && response instanceof String)
                ? validateResponse((String) response) : Boolean.FALSE;
    }

    /**
     * Very simple validation routine that compares the given response to the internal string.
     *
     * @return true if the given response equals the internal response, false otherwise.
     */
    private final Boolean validateResponse(final String response) {
        return Boolean.valueOf(response.equals(this.response));
    }
}