pgpoint.java

关系型数据库 Postgresql 6.5.2

package postgresql.geometric;

import java.awt.Point;
import java.io.*;
import java.sql.*;

import postgresql.util.*;

/**
 * This implements a version of java.awt.Point, except it uses double
 * to represent the coordinates.
 *
 * <p>It maps to the point datatype in postgresql.
 */
public class PGpoint extends PGobject implements Serializable,Cloneable
{
  /**
   * The X coordinate of the point
   */
  public double x;
  
  /**
   * The Y coordinate of the point
   */
  public double y;
  
  /**
   * @param x coordinate
   * @param y coordinate
   */
  public PGpoint(double x,double y)
  {
    this();
    this.x = x;
    this.y = y;
  }
  
  /**
   * This is called mainly from the other geometric types, when a
   * point is imbeded within their definition.
   *
   * @param value Definition of this point in PostgreSQL's syntax
   */
  public PGpoint(String value) throws SQLException
  {
    this();
    setValue(value);
  }
  
  /**
   * Required by the driver
   */
  public PGpoint()
  {
    setType("point");
  }
  
  /**
   * @param s Definition of this point in PostgreSQL's syntax
   * @exception SQLException on conversion failure
   */
  public void setValue(String s) throws SQLException
  {
    PGtokenizer t = new PGtokenizer(PGtokenizer.removePara(s),',');
    try {
      x = Double.valueOf(t.getToken(0)).doubleValue();
      y = Double.valueOf(t.getToken(1)).doubleValue();
    } catch(NumberFormatException e) {
      throw new PSQLException("postgresql.geo.point",e.toString());
    }
  }
  
  /**
   * @param obj Object to compare with
   * @return true if the two boxes are identical
   */
  public boolean equals(Object obj)
  {
    if(obj instanceof PGpoint) {
      PGpoint p = (PGpoint)obj;
      return x == p.x && y == p.y;
    }
    return false;
  }
  
  /**
   * This must be overidden to allow the object to be cloned
   */
  public Object clone()
  {
    return new PGpoint(x,y);
  }
  
  /**
   * @return the PGpoint in the syntax expected by postgresql
   */
  public String getValue()
  {
    return "("+x+","+y+")";
  }
  
  /**
   * Translate the point with the supplied amount.
   * @param x integer amount to add on the x axis
   * @param y integer amount to add on the y axis
   */
  public void translate(int x,int y)
  {
    translate((double)x,(double)y);
  }
  
  /**
   * Translate the point with the supplied amount.
   * @param x double amount to add on the x axis
   * @param y double amount to add on the y axis
   */
  public void translate(double x,double y)
  {
    this.x += x;
    this.y += y;
  }
  
  /**
   * Moves the point to the supplied coordinates.
   * @param x integer coordinate
   * @param y integer coordinate
   */
  public void move(int x,int y)
  {
    setLocation(x,y);
  }
  
  /**
   * Moves the point to the supplied coordinates.
   * @param x double coordinate
   * @param y double coordinate
   */
  public void move(double x,double y)
  {
    this.x = x;
    this.y = y;
  }
  
  /**
   * Moves the point to the supplied coordinates.
   * refer to java.awt.Point for description of this
   * @param x integer coordinate
   * @param y integer coordinate
   * @see java.awt.Point
   */
  public void setLocation(int x,int y)
  {
    move((double)x,(double)y);
  }
  
  /**
   * Moves the point to the supplied java.awt.Point
   * refer to java.awt.Point for description of this
   * @param p Point to move to
   * @see java.awt.Point
   */
  public void setLocation(Point p)
  {
    setLocation(p.x,p.y);
  }
  
}