/**
 * This is my own work: Sarah Harris CSC 330 homework 1 Determining if an
 * entered value is negative, prime and/or a perfect square
 *
 */
public class Hw1_882792021 {

    // creates interface for three classes to implement
    static public interface Specify<T> {

        // takes in T value to convert to generic, boolean result
        public boolean specify(T val);
    }

    public static void main(String[] args) {
// example code from question in book
        Integer[] input = {100, 37, 49};

        boolean result1 = contains(input, new Prime());
        boolean result2 = contains(input, new PerfectSquare());
        boolean result3 = contains(input, new Negative());

        // output the results of each test    
        System.out.println(result1);
        System.out.println(result2);
        System.out.println(result3);

    }

    public static <T> boolean contains(T[] input, Specify<T> val) {
        // creates default result to false  
        boolean result = false;
        // runs a for loop to go through whole array  
        for (int i = 0; i < input.length; i++) {
            // keeps checking for a true result until one is found     
            if (result != true) {
                // calls the numerical value into the class choosen in main         
                result = val.specify(input[i]);
            }
        }
        // if one is not found, a false result will occur  
        return result;

    }

    static public class Prime<T> implements Specify<Integer> {

        @Override
        public boolean specify(Integer val) {
            // 2 is a 'special prime', always put value to true  
            if (val == 2) {
                return true;
            }
            // keeps modding the number up until one less its value
            // if a value other than itself has a mod of 0, false will occur
            for (int i = 2; i <= val - 1; i++) {
                if (val % i == 0) {
                    return false;
                }
            }
            // returns false iff val % val is 0 , nothing else
            return true;
        }

    }

    static public class PerfectSquare<T> implements Specify<Integer> {

        @Override
        public boolean specify(Integer val) {
            // first takes squre root of val, then mods by one
            // if result is 0, its a perfect square, false otherwise
            return Math.sqrt(val) % 1 == 0;
        }

    }

    static public class Negative<T> implements Specify<Integer> {

        @Override
        public boolean specify(Integer val) {
            // if the val is less than 0, its a negative
            return val < 0;
        }

    }

}