package java.util;

public final class Objects {
  private Objects() {
    throw new AssertionError("Instantiating java.long.Objetcs is not allowed!");
  }

  public static <T> int compare(final T x, final T y, final Comparator<? super T> comparator) {
    if (x == y)
      return 0;
    else
      return comparator.compare(x, y);
  }

  public static boolean deepEquals(final Object x, final Object y) {
    if (x == y)
      return true;
    if (x == null || y == null)
      return false;
    if (x.getClass().isArray()) {
      if(x instanceof Object[] && y instanceof Object[])
        return Arrays.deepEquals((Object[])x, (Object[])y);
      if(x instanceof byte[] && y instanceof byte[])
        return Arrays.equals((byte[]) x, (byte[]) y);
      if(x instanceof int[] && y instanceof int[])
        return Arrays.equals((int[]) x, (int[]) y);
      if(x instanceof long[] && y instanceof long[])
        return Arrays.equals((long[]) x, (long[]) y);
      if(x instanceof short[] && y instanceof short[])
        return Arrays.equals((short[]) x, (short[]) y);
      if(x instanceof char[] && y instanceof char[])
        return Arrays.equals((char[]) x, (char[]) y);
      if(x instanceof float[] && y instanceof float[])
        return Arrays.equals((float[]) x, (float[]) y);
      if(x instanceof double[] && y instanceof double[])
        return Arrays.equals((double[]) x, (double[]) y);
    }
    return x.equals(y);
  }

  public static boolean equals(final Object x, final Object y) {
    if (x == y)
      return true;
    if (x != null)
      return x.equals(y);
    return false;
  }

  public static int hash(final Object... values) {
    return Arrays.hashCode(values);
  }

  public static int hashCode(final Object value) {
    if (value == null)
      return 0;
    return value.hashCode();
  }

  public static <T> T requireNonNull(final T value) {
    if (value == null)
      throw new NullPointerException();
    else
      return value;
  }

  public static <T> T requireNonNull(final T value, String message) {
    if (value == null)
      throw new NullPointerException(message);
    else
      return value;
  }

  public static String toString(final Object value) {
    return String.valueOf(value);
  }

  public static String toString(final Object value, final String defaultValue) {
    if (value == null)
      return defaultValue;
    return value.toString();
  }
}