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/*-------------------------------------------------------------------------
*
* Copyright (c) 2003-2011, PostgreSQL Global Development Group
*
*
*-------------------------------------------------------------------------
*/
package org.postgresql.geometric;
import org.postgresql.util.PGobject;
import org.postgresql.util.PGtokenizer;
import java.io.Serializable;
import java.sql.SQLException;
/**
* This implements the polygon datatype within PostgreSQL.
*/
public class PGpolygon extends PGobject implements Serializable, Cloneable
{
/**
* The points defining the polygon
*/
public PGpoint points[];
/**
* Creates a polygon using an array of PGpoints
*
* @param points the points defining the polygon
*/
public PGpolygon(PGpoint[] points)
{
this();
this.points = points;
}
/**
* @param s definition of the polygon in PostgreSQL's syntax.
* @exception SQLException on conversion failure
*/
public PGpolygon(String s) throws SQLException
{
this();
setValue(s);
}
/**
* Required by the driver
*/
public PGpolygon()
{
setType("polygon");
}
/**
* @param s Definition of the polygon in PostgreSQL's syntax
* @exception SQLException on conversion failure
*/
public void setValue(String s) throws SQLException
{
PGtokenizer t = new PGtokenizer(PGtokenizer.removePara(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 polygons are identical
*/
public boolean equals(Object obj)
{
if (obj instanceof PGpolygon)
{
PGpolygon p = (PGpolygon)obj;
if (p.points.length != points.length)
return false;
for (int i = 0;i < points.length;i++)
if (!points[i].equals(p.points[i]))
return false;
return true;
}
return false;
}
public int hashCode() {
// XXX not very good..
int hash = 0;
for (int i = 0; i < points.length && i < 5; ++i)
{
hash = hash ^ points[i].hashCode();
}
return hash;
}
public Object clone() throws CloneNotSupportedException
{
PGpolygon newPGpolygon = (PGpolygon) super.clone();
if( newPGpolygon.points != null )
{
newPGpolygon.points = (PGpoint[]) newPGpolygon.points.clone();
for( int i = 0; i < newPGpolygon.points.length; ++i )
if( newPGpolygon.points[i] != null )
newPGpolygon.points[i] = (PGpoint) newPGpolygon.points[i].clone();
}
return newPGpolygon;
}
/**
* @return the PGpolygon in the syntax expected by org.postgresql
*/
public String getValue()
{
StringBuffer b = new StringBuffer();
b.append("(");
for (int p = 0;p < points.length;p++)
{
if (p > 0)
b.append(",");
b.append(points[p].toString());
}
b.append(")");
return b.toString();
}
}
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