org.geotools.referencing.factory.gridshift
Class NTv2GridShiftFactory

Object
  extended by AbstractFactory
      extended by ReferencingFactory
          extended by NTv2GridShiftFactory
All Implemented Interfaces:
RegisterableService, BufferedFactory, Factory

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
protected static Logger LOGGER
          Logger.
 
Fields inherited from class AbstractFactory
hints, MAXIMUM_PRIORITY, MINIMUM_PRIORITY, NORMAL_PRIORITY, priority
 
Constructor Summary
NTv2GridShiftFactory()
          Constructs a factory with the default priority.
NTv2GridShiftFactory(int priority)
          Constructs an instance using the specified priority level.
 
Method Summary
 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:
name - The NTv2 grid file name
Returns:
true if file exists and is valid, false otherwise

createNTv2Grid

public GridShiftFile createNTv2Grid(URL gridLocation)
                             throws FactoryException
Creates a NTv2 Grid.

Parameters:
name - The NTv2 grid name
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:
location - the NTv2 file absolute path
Returns:
true if file has NTv2 format, false otherwise


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