package org.postgresql.geometric;

import java.io.*;
import java.sql.*;
import org.postgresql.util.*;

/**
 * This  represents the box datatype within org.postgresql.
 */
public class PGbox extends PGobject implements Serializable, Cloneable
{
	/**
	 * These are the two points.
	 */
	public PGpoint point[] = new PGpoint[2];

	/**
	 * @param x1 first x coordinate
	 * @param y1 first y coordinate
	 * @param x2 second x coordinate
	 * @param y2 second y coordinate
	 */
	public PGbox(double x1, double y1, double x2, double y2)
	{
		this();
		this.point[0] = new PGpoint(x1, y1);
		this.point[1] = new PGpoint(x2, y2);
	}

	/**
	 * @param p1 first point
	 * @param p2 second point
	 */
	public PGbox(PGpoint p1, PGpoint p2)
	{
		this();
		this.point[0] = p1;
		this.point[1] = p2;
	}

	/**
	 * @param s Box definition in PostgreSQL syntax
	 * @exception SQLException if definition is invalid
	 */
	public PGbox(String s) throws SQLException
	{
		this();
		setValue(s);
	}

	/**
	 * Required constructor
	 */
	public PGbox()
	{
		setType("box");
	}

	/**
	 * This method sets the value of this object. It should be overidden,
	 * but still called by subclasses.
	 *
	 * @param value a string representation of the value of the object
	 * @exception SQLException thrown if value is invalid for this type
	 */
	public void setValue(String value) throws SQLException
	{
		PGtokenizer t = new PGtokenizer(value, ',');
		if (t.getSize() != 2)
			throw new PSQLException("postgresql.geo.box", value);

		point[0] = new PGpoint(t.getToken(0));
		point[1] = new PGpoint(t.getToken(1));
	}

	/**
	 * @param obj Object to compare with
	 * @return true if the two boxes are identical
	 */
	public boolean equals(Object obj)
	{
		if (obj instanceof PGbox)
		{
			PGbox p = (PGbox)obj;
			return (p.point[0].equals(point[0]) && p.point[1].equals(point[1])) ||
				   (p.point[0].equals(point[1]) && p.point[1].equals(point[0]));
		}
		return false;
	}

	/**
	 * This must be overidden to allow the object to be cloned
	 */
	public Object clone()
	{
		return new PGbox((PGpoint)point[0].clone(), (PGpoint)point[1].clone());
	}

	/**
	 * @return the PGbox in the syntax expected by org.postgresql
	 */
	public String getValue()
	{
		return point[0].toString() + "," + point[1].toString();
	}
}
