// Copyright (C) 2003-2009 by Object Mentor, Inc. All rights reserved.
// Released under the terms of the CPL Common Public License version 1.0.
package fitnesse.testutil;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class CartesianVector {
  private double x = 0;
  private double y = 0;

  public CartesianVector() {
  }

  public CartesianVector(double x, double y) {
    this.x = x;
    this.y = y;
  }

  public static CartesianVector parse(String s) {
    Pattern vectorPattern = Pattern.compile("\\((.*),(.*)\\)");
    Matcher vectorMatcher = vectorPattern.matcher(s);
    if (vectorMatcher.matches()) {
      double x = Double.parseDouble(vectorMatcher.group(1));
      double y = Double.parseDouble(vectorMatcher.group(2));
      return new CartesianVector(x, y);
    }
    return null;
  }

  public boolean equals(Object obj) {
    if (obj instanceof CartesianVector) {
      CartesianVector v = (CartesianVector) obj;
      if (v.x == x && v.y == y)
        return true;
    }
    return false;
  }

  public int hashCode() {
    assert false : "hashCode not designed";
  return 42;
  }

  public double getX() {
    return x;
  }

  public double getY() {
    return y;
  }

  public CartesianVector add(CartesianVector v) {
    return new CartesianVector(v.getX() + x, v.getY() + y);
  }
}