hash functions

class ETHHash extends HashTable {
  public ETHHash(int size) {
    super(size);
  }

  @Override
  public int hash(String item) {
    if (item != null) {
      int bn = 1;
      for (int i = 0; i < item.length(); i++) {
        bn = Integer.valueOf(item.charAt(i))*((bn % 257) + 1);
      }
      return bn % getCapacity();
    }
    return 0;
  }
}

class GNUCPPHash extends HashTable {
  public GNUCPPHash(int size) {
    super(size);
  }

  @Override
  public int hash(String item) {
    if (item != null) {
      int bn = 0;
      for (int i = 0; i < item.length(); i++) {
        bn = 4*bn + Integer.valueOf(item.charAt(i));
      }
      return (((1 << 31) - 1) & bn) % getCapacity();
    }
    return 0;
  }
}

class GNUCC1Hash extends HashTable {
  public GNUCC1Hash(int size) {
    super(size);
  }

  @Override
  public int hash(String item) {
    if (item != null) {
      int bn = item.length();
      for (int i = 0; i < item.length(); i++) {
        bn = 613*bn + Integer.valueOf(item.charAt(i));
      }
      return (((1 << 30) - 1) & bn) % getCapacity();
    }
    return 0;
  }
}

class HashCodeHash extends HashTable {
  public HashCodeHash(int size) {
    super(size);
  }

  @Override
  public int hash(String item) {
    if (item != null) {
      return Math.abs(item.hashCode()) % getCapacity();
    }
    return 0;
  }
}