

package jflowmap.util;

/**
 * @author Ilya Boyandin
 */
public class Pair<F,S> {

  private final F first;
  private final S second;
  
  public Pair(F first, S second) {
    this.first = first;
    this.second = second;
  }

  public F first() {
    return first;
  }

  public S second() {
    return second;
  }
  
  public final static <F,S> Pair<F,S> of(F first, S second) {
    return new Pair<F,S>(first, second);
  }
  

  @Override
  public int hashCode() {
    final int prime = 31;
    int result = 1;
    result = prime * result + ((first == null) ? 0 : first.hashCode());
    result = prime * result + ((second == null) ? 0 : second.hashCode());
    return result;
  }

  @Override
  public boolean equals(Object obj) {
    if (this == obj)
      return true;
    if (obj == null)
      return false;
    if (getClass() != obj.getClass())
      return false;
    @SuppressWarnings("unchecked")
    Pair other = (Pair) obj;
    if (first == null) {
      if (other.first != null)
        return false;
    } else if (!first.equals(other.first))
      return false;
    if (second == null) {
      if (other.second != null)
        return false;
    } else if (!second.equals(other.second))
      return false;
    return true;
  }

  public String toString()
  {
    return "Pair{"
      + super.toString() + ", "
      + "first = " + this.first + ", "
      + "second = " + this.second
      + "}";
  }
  
}

