package org.postgresql.geometric;

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

/**
 * This implements a lseg (line segment) consisting of two points
 */
public class PGlseg extends PGobject implements Serializable, Cloneable
{
	/**
	 * These are the two points.
	 */
	public PGpoint point[] = new PGpoint[2];

	/**
	 * @param x1 coordinate for first point
	 * @param y1 coordinate for first point
	 * @param x2 coordinate for second point
	 * @param y2 coordinate for second point
	 */
	public PGlseg(double x1, double y1, double x2, double y2)
	{
		this(new PGpoint(x1, y1), new PGpoint(x2, y2));
	}

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

	/**
	 * @param s definition of the circle in PostgreSQL's syntax.
	 * @exception SQLException on conversion failure
	 */
	public PGlseg(String s) throws SQLException
	{
		this();
		setValue(s);
	}

	/**
	 * reuired by the driver
	 */
	public PGlseg()
	{
		setType("lseg");
	}

	/**
	 * @param s Definition of the line segment in PostgreSQL's syntax
	 * @exception SQLException on conversion failure
	 */
	public void setValue(String s) throws SQLException
	{
		PGtokenizer t = new PGtokenizer(PGtokenizer.removeBox(s), ',');
		if (t.getSize() != 2)
			throw new PSQLException("postgresql.geo.lseg");

		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 PGlseg)
		{
			PGlseg p = (PGlseg)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 PGlseg((PGpoint)point[0].clone(), (PGpoint)point[1].clone());
	}

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