com.vividsolutions.jts.geom.impl

Class PackedCoordinateSequence

java.lang.Object

com.vividsolutions.jts.geom.impl.PackedCoordinateSequence

All Implemented Interfaces:

CoordinateSequence, Cloneable

Direct Known Subclasses:

PackedCoordinateSequence.Double, PackedCoordinateSequence.Float

public abstract class PackedCoordinateSequence
extends Object
implements CoordinateSequence

A CoordinateSequence implementation based on a packed arrays. In this implementation, Coordinates returned by #toArray and #get are copies of the internal values. To change the actual values, use the provided setters.

For efficiency, created Coordinate arrays are cached using a soft reference. The cache is cleared each time the coordinate sequence contents are modified through a setter method.

Version:

1.7

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	PackedCoordinateSequence.Double Packed coordinate sequence implementation based on doubles
static class	PackedCoordinateSequence.Float Packed coordinate sequence implementation based on floats

Field Summary

Fields

Modifier and Type	Field and Description
protected SoftReference	coordRef A soft reference to the Coordinate[] representation of this sequence.
protected int	dimension The dimensions of the coordinates hold in the packed array

Fields inherited from interface com.vividsolutions.jts.geom.CoordinateSequence

M, X, Y, Z

Constructor Summary

Constructors

Constructor and Description
PackedCoordinateSequence()

Method Summary

Methods

Modifier and Type	Method and Description
abstract Object	clone() Returns a deep copy of this collection.
Coordinate	getCoordinate(int i) Returns (possibly a copy of) the i'th coordinate in this sequence.
void	getCoordinate(int i, Coordinate coord) Copies the i'th coordinate in the sequence to the supplied Coordinate.
Coordinate	getCoordinateCopy(int i) Returns a copy of the i'th coordinate in this sequence.
protected abstract Coordinate	getCoordinateInternal(int index) Returns a Coordinate representation of the specified coordinate, by always building a new Coordinate object
int	getDimension() Returns the dimension (number of ordinates in each coordinate) for this sequence.
abstract double	getOrdinate(int index, int ordinateIndex) Returns the ordinate of a coordinate in this sequence.
double	getX(int index) Returns ordinate X (0) of the specified coordinate.
double	getY(int index) Returns ordinate Y (1) of the specified coordinate.
abstract void	setOrdinate(int index, int ordinate, double value) Sets the ordinate of a coordinate in this sequence.
void	setX(int index, double value) Sets the first ordinate of a coordinate in this sequence.
void	setY(int index, double value) Sets the second ordinate of a coordinate in this sequence.
Coordinate[]	toCoordinateArray() Returns (possibly copies of) the Coordinates in this collection.
String	toString()

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface com.vividsolutions.jts.geom.CoordinateSequence

expandEnvelope, size

Field Detail

dimension

protected int dimension

The dimensions of the coordinates hold in the packed array

coordRef

protected SoftReference coordRef

A soft reference to the Coordinate[] representation of this sequence. Makes repeated coordinate array accesses more efficient.

Constructor Detail

PackedCoordinateSequence

public PackedCoordinateSequence()

Method Detail

getDimension

public int getDimension()

Description copied from interface: CoordinateSequence

Returns the dimension (number of ordinates in each coordinate) for this sequence.

Specified by:

getDimension in interface CoordinateSequence

Returns:

the dimension of the sequence.

See Also:

CoordinateSequence.getDimension()

getCoordinate

public Coordinate getCoordinate(int i)

Description copied from interface: CoordinateSequence

Returns (possibly a copy of) the i'th coordinate in this sequence. Whether or not the Coordinate returned is the actual underlying Coordinate or merely a copy depends on the implementation.

Note that in the future the semantics of this method may change to guarantee that the Coordinate returned is always a copy. Callers should not to assume that they can modify a CoordinateSequence by modifying the object returned by this method.

Specified by:

getCoordinate in interface CoordinateSequence

Parameters:

i - the index of the coordinate to retrieve

Returns:

the i'th coordinate in the sequence

See Also:

CoordinateSequence.getCoordinate(int)

getCoordinateCopy

public Coordinate getCoordinateCopy(int i)

Description copied from interface: CoordinateSequence

Returns a copy of the i'th coordinate in this sequence. This method optimizes the situation where the caller is going to make a copy anyway - if the implementation has already created a new Coordinate object, no further copy is needed.

Specified by:

getCoordinateCopy in interface CoordinateSequence

Parameters:

i - the index of the coordinate to retrieve

Returns:

a copy of the i'th coordinate in the sequence

See Also:

CoordinateSequence.getCoordinate(int)

getCoordinate

public void getCoordinate(int i,
                 Coordinate coord)

Description copied from interface: CoordinateSequence

Copies the i'th coordinate in the sequence to the supplied Coordinate. Only the first two dimensions are copied.

Specified by:

getCoordinate in interface CoordinateSequence

Parameters:

i - the index of the coordinate to copy

coord - a Coordinate to receive the value

See Also:

CoordinateSequence.getCoordinate(int)

toCoordinateArray

public Coordinate[] toCoordinateArray()

Description copied from interface: CoordinateSequence

Returns (possibly copies of) the Coordinates in this collection. Whether or not the Coordinates returned are the actual underlying Coordinates or merely copies depends on the implementation. Note that if this implementation does not store its data as an array of Coordinates, this method will incur a performance penalty because the array needs to be built from scratch.

Specified by:

toCoordinateArray in interface CoordinateSequence

Returns:

a array of coordinates containing the point values in this sequence

See Also:

CoordinateSequence.toCoordinateArray()

getX

public double getX(int index)

Description copied from interface: CoordinateSequence

Returns ordinate X (0) of the specified coordinate.

Specified by:

getX in interface CoordinateSequence

Returns:

the value of the X ordinate in the index'th coordinate

See Also:

CoordinateSequence.getX(int)

getY

public double getY(int index)

Description copied from interface: CoordinateSequence

Returns ordinate Y (1) of the specified coordinate.

Specified by:

getY in interface CoordinateSequence

Returns:

the value of the Y ordinate in the index'th coordinate

See Also:

CoordinateSequence.getY(int)

getOrdinate

public abstract double getOrdinate(int index,
                 int ordinateIndex)

Description copied from interface: CoordinateSequence

Returns the ordinate of a coordinate in this sequence. Ordinate indices 0 and 1 are assumed to be X and Y. Ordinates indices greater than 1 have user-defined semantics (for instance, they may contain other dimensions or measure values).

Specified by:

getOrdinate in interface CoordinateSequence

Parameters:

index - the coordinate index in the sequence

ordinateIndex - the ordinate index in the coordinate (in range [0, dimension-1])

See Also:

CoordinateSequence.getOrdinate(int, int)

setX

public void setX(int index,
        double value)

Sets the first ordinate of a coordinate in this sequence.

Parameters:

index - the coordinate index

value - the new ordinate value

setY

public void setY(int index,
        double value)

Sets the second ordinate of a coordinate in this sequence.

Parameters:

index - the coordinate index

value - the new ordinate value

toString

public String toString()

Overrides:

toString in class Object

getCoordinateInternal

protected abstract Coordinate getCoordinateInternal(int index)

Returns a Coordinate representation of the specified coordinate, by always building a new Coordinate object

Parameters:

index -

Returns:

clone

public abstract Object clone()

Description copied from interface: CoordinateSequence

Returns a deep copy of this collection. Called by Geometry#clone.

Specified by:

clone in interface CoordinateSequence

Overrides:

clone in class Object

Returns:

a copy of the coordinate sequence containing copies of all points

See Also:

Object.clone()

setOrdinate

public abstract void setOrdinate(int index,
               int ordinate,
               double value)

Sets the ordinate of a coordinate in this sequence.
Warning: for performance reasons the ordinate index is not checked - if it is over dimensions you may not get an exception but a meaningless value.

Specified by:

setOrdinate in interface CoordinateSequence

Parameters:

index - the coordinate index

ordinate - the ordinate index in the coordinate, 0 based, smaller than the number of dimensions

value - the new ordinate value