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/****************************************************************************
Copyright 2004, Colorado School of Mines and others.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
****************************************************************************/
package edu.mines.jtk.sgl;

/**
 * A tuple with four components x, y, z, and w.
 * @author Dave Hale, Colorado School of Mines
 * @version 2005.05.19
 */
public class Tuple4 {

  /**
   * The component x.
   */
  public double x;

  /**
   * The component y.
   */
  public double y;

  /**
   * The component z.
   */
  public double z;

  /**
   * The component w.
   */
  public double w;

  /**
   * Constructs a tuple with all components equal to zero.
   */
  public Tuple4() {
  }

  /**
   * Constructs a tuple with specified components.
   * @param x the x component.
   * @param y the y component.
   * @param z the z component.
   * @param w the w component.
   */
  public Tuple4(double x, double y, double z, double w) {
    this.x = x;
    this.y = y;
    this.z = z;
    this.w = w;
  }

  /**
   * Constructs a copy of the specified tuple.
   * @param t the tuple.
   */
  public Tuple4(Tuple4 t) {
    x = t.x;
    y = t.y;
    z = t.z;
    w = t.w;
  }

  public boolean equals(Object obj) {
    if (this==obj)
      return true;
    if (obj==null || this.getClass()!=obj.getClass())
      return false;
    Tuple4 that = (Tuple4)obj;
    return this.x==that.x && 
           this.y==that.y && 
           this.z==that.z &&
           this.w==that.w;
  }

  public int hashCode() {
    long xbits = Double.doubleToLongBits(x);
    long ybits = Double.doubleToLongBits(y);
    long zbits = Double.doubleToLongBits(z);
    long wbits = Double.doubleToLongBits(w);
    return (int)(xbits^(xbits>>>32)^
                 ybits^(ybits>>>32)^
                 zbits^(zbits>>>32)^
                 wbits^(wbits>>>32));
  }

  public String toString() {
    return "("+x+","+y+","+z+","+w+")";
  }
}