org.postgresql.geometric

Class PGpoint

java.lang.Object

org.postgresql.util.PGobject

org.postgresql.geometric.PGpoint

All Implemented Interfaces:

Serializable, Cloneable, PGBinaryObject

public class PGpoint
extends PGobject
implements PGBinaryObject, Serializable, Cloneable

It maps to the point datatype in org.postgresql.

This implements a version of java.awt.Point, except it uses double to represent the coordinates.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
double	x The X coordinate of the point.
double	y The Y coordinate of the point.

Fields inherited from class org.postgresql.util.PGobject

type, value

Constructor Summary

Constructors

Constructor and Description
PGpoint() Required by the driver.
PGpoint(double x, double y)
PGpoint(String value) This is called mainly from the other geometric types, when a point is embedded within their definition.

Method Summary

Modifier and Type	Method and Description
Object	clone() This must be overidden to allow the object to be cloned.
boolean	equals(Object obj) This must be overidden to allow comparisons of objects.
String	getValue() This must be overidden, to return the value of the object, in the form required by org.postgresql.
int	hashCode() Compute hash.
int	lengthInBytes() This method is called to return the number of bytes needed to store this object in the binary form required by org.postgresql.
void	move(double x, double y) Moves the point to the supplied coordinates.
void	move(int x, int y) Moves the point to the supplied coordinates.
void	setByteValue(byte[] b, int offset) This method is called to set the value of this object.
void	setLocation(int x, int y) Moves the point to the supplied coordinates.
void	setLocation(Point p) Moves the point to the supplied java.awt.Point refer to java.awt.Point for description of this.
void	setValue(String s) This method sets the value of this object.
void	toBytes(byte[] b, int offset) Populate the byte array with PGpoint in the binary syntax expected by org.postgresql.
void	translate(double x, double y) Translate the point by the supplied amount.
void	translate(int x, int y) Translate the point by the supplied amount.

Methods inherited from class org.postgresql.util.PGobject

getType, setType, toString

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

x

public double x

The X coordinate of the point.

y

public double y

The Y coordinate of the point.

Constructor Detail

PGpoint

public PGpoint(double x,
               double y)

Parameters:

x - coordinate

y - coordinate

PGpoint

public PGpoint(String value)
        throws SQLException

This is called mainly from the other geometric types, when a point is embedded within their definition.

Parameters:

value - Definition of this point in PostgreSQL's syntax

Throws:

SQLException - if something goes wrong

PGpoint

public PGpoint()

Required by the driver.

Method Detail

setValue

public void setValue(String s)
              throws SQLException

Description copied from class: PGobject

This method sets the value of this object. It must be overridden.

Overrides:

setValue in class PGobject

Parameters:

s - Definition of this point in PostgreSQL's syntax

Throws:

SQLException - on conversion failure

setByteValue

public void setByteValue(byte[] b,
                         int offset)

Description copied from interface: PGBinaryObject

This method is called to set the value of this object.

Specified by:

setByteValue in interface PGBinaryObject

Parameters:

b - Definition of this point in PostgreSQL's binary syntax

offset - the offset in the byte array where object data starts

equals

public boolean equals(Object obj)

Description copied from class: PGobject

This must be overidden to allow comparisons of objects.

Overrides:

equals in class PGobject

Parameters:

obj - Object to compare with

Returns:

true if the two points are identical

See Also:

Object.hashCode(), HashMap

hashCode

public int hashCode()

Description copied from class: PGobject

Compute hash. As equals() use only value. Return the same hash for the same value.

Overrides:

hashCode in class PGobject

Returns:

Value hashcode, 0 if value is null Objects.hashCode(Object)

See Also:

Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)

getValue

public String getValue()

Description copied from class: PGobject

This must be overidden, to return the value of the object, in the form required by org.postgresql.

Overrides:

getValue in class PGobject

Returns:

the PGpoint in the syntax expected by org.postgresql

lengthInBytes

public int lengthInBytes()

Description copied from interface: PGBinaryObject

This method is called to return the number of bytes needed to store this object in the binary form required by org.postgresql.

Specified by:

lengthInBytes in interface PGBinaryObject

Returns:

the number of bytes needed to store this object

toBytes

public void toBytes(byte[] b,
                    int offset)

Populate the byte array with PGpoint in the binary syntax expected by org.postgresql.

Specified by:

toBytes in interface PGBinaryObject

Parameters:

b - the array to store the value, it is guaranteed to be at lest PGBinaryObject.lengthInBytes() in size.

offset - the offset in the byte array where object must be stored

translate

public void translate(int x,
                      int y)

Translate the point by the supplied amount.

Parameters:

x - integer amount to add on the x axis

y - integer amount to add on the y axis

translate

public void translate(double x,
                      double y)

Translate the point by the supplied amount.

Parameters:

x - double amount to add on the x axis

y - double amount to add on the y axis

move

public void move(int x,
                 int y)

Moves the point to the supplied coordinates.

Parameters:

x - integer coordinate

y - integer coordinate

move

public void move(double x,
                 double y)

Moves the point to the supplied coordinates.

Parameters:

x - double coordinate

y - double coordinate

setLocation

public void setLocation(int x,
                        int y)

Moves the point to the supplied coordinates. refer to java.awt.Point for description of this.

Parameters:

x - integer coordinate

y - integer coordinate

See Also:

Point

setLocation

public void setLocation(Point p)

Moves the point to the supplied java.awt.Point refer to java.awt.Point for description of this.

Parameters:

p - Point to move to

See Also:

Point

clone

public Object clone()
             throws CloneNotSupportedException

Description copied from class: PGobject

This must be overidden to allow the object to be cloned.

Overrides:

clone in class PGobject

Returns:

a clone of this instance.

Throws:

CloneNotSupportedException - if the object's class does not support the Cloneable interface. Subclasses that override the clone method can also throw this exception to indicate that an instance cannot be cloned.

See Also:

Cloneable