Package org.geotools.referencing.factory.gridshift

Class NTv2GridShiftFactory

Object

AbstractFactory

ReferencingFactory

NTv2GridShiftFactory

All Implemented Interfaces:

Factory, BufferedFactory, Factory, RegistrableFactory

public class NTv2GridShiftFactory
extends ReferencingFactory
implements BufferedFactory

Loads and caches NTv2 grid files. Thisthat incorporates a soft cache mechanism to keep grids in memory when first loaded. It also checks NTv2 grid file format in #isNTv2Grid(String) method.

Author:

Oscar Fonts

Field Summary

Fields

Modifier and Type	Field	Description
protected static Logger	LOGGER	Logger.

Fields inherited from class AbstractFactory

hints, MAXIMUM_PRIORITY, MINIMUM_PRIORITY, NORMAL_PRIORITY, priority

Constructor Summary

Constructors

Constructor	Description
NTv2GridShiftFactory()	Constructs a factory with the default priority.
NTv2GridShiftFactory(int priority)	Constructs an instance using the specified priority level.

Method Summary

Modifier and Type	Method	Description
GridShiftFile	createNTv2Grid(URL gridLocation)	Creates a NTv2 Grid.
boolean	isNTv2Grid(URL location)	Performs a NTv2 grid file lookup given its name, and checks for file format correctness.
protected boolean	isNTv2GridFileValid(URL url)	Checks if a given resource is a valid NTv2 file without fully loading it.

Methods inherited from class ReferencingFactory

ensureNonNull, getVendor

Methods inherited from class AbstractFactory

addImplementationHints, equals, getImplementationHints, getPriority, hashCode, onDeregistration, onRegistration, toString

Methods inherited from class Object

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

Methods inherited from interface Factory

getImplementationHints

Field Detail

LOGGER

protected static final Logger LOGGER

Logger.

Constructor Detail

NTv2GridShiftFactory

public NTv2GridShiftFactory()

Constructs a factory with the default priority.

NTv2GridShiftFactory

public NTv2GridShiftFactory(int priority)

Constructs an instance using the specified priority level.

Parameters:

priority - The priority for this factory, as a number between MINIMUM_PRIORITY and MAXIMUM_PRIORITY inclusive.

Method Detail

isNTv2Grid

public boolean isNTv2Grid(URL location)

Performs a NTv2 grid file lookup given its name, and checks for file format correctness.

Parameters:

location - The NTv2 grid file location

Returns:

true if file exists and is valid, false otherwise

createNTv2Grid

public GridShiftFile createNTv2Grid(URL gridLocation)
                             throws FactoryException

Creates a NTv2 Grid.

Parameters:

gridLocation - The NTv2 grid file location

Returns:

the grid

Throws:

FactoryException - if grid cannot be created

isNTv2GridFileValid

protected boolean isNTv2GridFileValid(URL url)

Checks if a given resource is a valid NTv2 file without fully loading it.

If file is not valid, the cause is logged at warning level.

Parameters:

url - the NTv2 file absolute path

Returns:

true if file has NTv2 format, false otherwise