package org.postgresql.geometric;

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

/**
 * This implements a path (a multiple segmented line, which may be closed)
 */
public class PGpath extends PGobject implements Serializable, Cloneable
{
	/**
	 * True if the path is open, false if closed
	 */
	public boolean open;

	/**
	 * The points defining this path
	 */
	public PGpoint points[];

	/**
	 * @param points the PGpoints that define the path
	 * @param open True if the path is open, false if closed
	 */
	public PGpath(PGpoint[] points, boolean open)
	{
		this();
		this.points = points;
		this.open = open;
	}

	/**
	 * Required by the driver
	 */
	public PGpath()
	{
		setType("path");
	}

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

	/**
	 * @param s Definition of the path in PostgreSQL's syntax
	 * @exception SQLException on conversion failure
	 */
	public void setValue(String s) throws SQLException
	{
		// First test to see if were open
		if (s.startsWith("[") && s.endsWith("]"))
		{
			open = true;
			s = PGtokenizer.removeBox(s);
		}
		else if (s.startsWith("(") && s.endsWith(")"))
		{
			open = false;
			s = PGtokenizer.removePara(s);
		}
		else
			throw new PSQLException("postgresql.geo.path");

		PGtokenizer t = new PGtokenizer(s, ',');
		int npoints = t.getSize();
		points = new PGpoint[npoints];
		for (int p = 0;p < npoints;p++)
			points[p] = new PGpoint(t.getToken(p));
	}

	/**
	 * @param obj Object to compare with
	 * @return true if the two boxes are identical
	 */
	public boolean equals(Object obj)
	{
		if (obj instanceof PGpath)
		{
			PGpath p = (PGpath)obj;

			if (p.points.length != points.length)
				return false;

			if (p.open != open)
				return false;

			for (int i = 0;i < points.length;i++)
				if (!points[i].equals(p.points[i]))
					return false;

			return true;
		}
		return false;
	}

	/**
	 * This must be overidden to allow the object to be cloned
	 */
	public Object clone()
	{
		PGpoint ary[] = new PGpoint[points.length];
		for (int i = 0;i < points.length;i++)
			ary[i] = (PGpoint)points[i].clone();
		return new PGpath(ary, open);
	}

	/**
	 * This returns the polygon in the syntax expected by org.postgresql
	 */
	public String getValue()
	{
		StringBuffer b = new StringBuffer(open ? "[" : "(");

		for (int p = 0;p < points.length;p++)
		{
			if (p > 0)
				b.append(",");
			b.append(points[p].toString());
		}
		b.append(open ? "]" : ")");

		return b.toString();
	}

	public boolean isOpen()
	{
		return open;
	}

	public boolean isClosed()
	{
		return !open;
	}

	public void closePath()
	{
		open = false;
	}

	public void openPath()
	{
		open = true;
	}

}
