PGline.java
上传用户:psq1974
上传日期:2007-01-06
资源大小:1195k
文件大小:2k
- package postgresql.geometric;
- import java.io.*;
- import java.sql.*;
- import postgresql.util.*;
- /**
- * This implements a line consisting of two points.
- *
- * Currently line is not yet implemented in the backend, but this class
- * ensures that when it's done were ready for it.
- */
- public class PGline 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 PGline(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 PGline(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 PGline(String s) throws SQLException
- {
- this();
- setValue(s);
- }
-
- /**
- * reuired by the driver
- */
- public PGline()
- {
- setType("line");
- }
-
- /**
- * @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 SQLException("conversion of line failed - "+s);
-
- 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 PGline) {
- PGline p = (PGline)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 PGline((PGpoint)point[0].clone(),(PGpoint)point[1].clone());
- }
-
- /**
- * @return the PGline in the syntax expected by postgresql
- */
- public String getValue()
- {
- return "["+point[0]+","+point[1]+"]";
- }
- }