package postgresql.geometric;

import java.io.*;
import java.sql.*;
import 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 SQLException("cannot tell if path is open or closed");
    
    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 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;
  }
  
}
