org.geotools.util.factory

Class FactoryCreator

Object

FactoryRegistry

FactoryCreator

public class FactoryCreator
extends FactoryRegistry

A factory registry capable to creates factories if no appropriate instance was found in the registry.

This class maintains a cache of previously created factories, as weak references. Calls to getFactory(Class, Predicate, Hints, Hints.Key)} first check if a previously created factory can fit.

Since:

2.1

Author:

Martin Desruisseaux, Jody Garnett

Field Summary

Fields inherited from class FactoryRegistry

LOGGER

Constructor Summary

Constructors

Constructor and Description
FactoryCreator(Class<?> category) Constructs a new registry for the specified category.
FactoryCreator(Class<?>[] categories) Constructs a new registry for the specified categories.
FactoryCreator(Collection<Class<?>> categories) Constructs a new registry for the specified categories.

Method Summary

Modifier and Type	Method and Description
protected <T> T	createFactory(Class<T> category, Class<?> implementation, Hints hints) Creates a new instance of the specified factory using the specified hints.
<T> T	getFactory(Class<T> category, Predicate<? super T> filter, Hints hints, Hints.Key key) Factory for the specified category, using the specified map of hints (if any).

Methods inherited from class FactoryRegistry

deregisterAll, deregisterAll, deregisterFactories, deregisterFactories, deregisterFactory, deregisterFactory, finalize, getClassLoaders, getFactories, getFactories, getFactories, getFactoryByClass, isAcceptable, registerFactories, registerFactories, registerFactory, registerFactory, scanForPlugins, setOrdering, setOrdering, setOrdering, streamCategories, unsetOrdering

Methods inherited from class Object

clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

FactoryCreator

public FactoryCreator(Class<?> category)

Constructs a new registry for the specified category.

Parameters:

category - The single category.

Since:

2.4

FactoryCreator

public FactoryCreator(Class<?>[] categories)

Constructs a new registry for the specified categories.

Parameters:

categories - The categories.

Since:

2.4

FactoryCreator

public FactoryCreator(Collection<Class<?>> categories)

Constructs a new registry for the specified categories.

Parameters:

categories - The categories.

Method Detail

getFactory

public <T> T getFactory(Class<T> category,
                        Predicate<? super T> filter,
                        Hints hints,
                        Hints.Key key)
                 throws FactoryRegistryException

Factory for the specified category, using the specified map of hints (if any). If a provider matching the requirements is found in the registry, it is returned. Otherwise, a new provider is created and returned. This creation step is the only difference between this method and the FactoryRegistry.getFactory(Class, Predicate, Hints, Hints.Key) super-class method}.

Overrides:

getFactory in class FactoryRegistry

Type Parameters:

T - The class represented by the category argument.

Parameters:

category - The category to look for.

filter - Optional predicate, or null if none.

hints - A map of hints, or null if none.

key - The key to use for looking for a user-provided instance in the hints, or null if none.

Returns:

A factory for the specified category and hints (never null).

Throws:

FactoryNotFoundException - if no factory was found, and the specified hints don't provide suffisient information for creating a new factory.

FactoryRegistryException - if the factory can't be created for some other reason.

See Also:

FactoryRegistry.getFactories(Class, Predicate, Hints), getFactory(java.lang.Class<T>, java.util.function.Predicate<? super T>, org.geotools.util.factory.Hints, org.geotools.util.factory.Hints.Key)

createFactory

protected <T> T createFactory(Class<T> category,
                              Class<?> implementation,
                              Hints hints)
                       throws FactoryRegistryException

Creates a new instance of the specified factory using the specified hints. The default implementation tries to instantiate the given implementation class using the first of the following constructor found:

• Constructor with a single Hints argument.
• No-argument constructor.

Parameters:

category - The category to instantiate.

implementation - The factory class to instantiate.

hints - The implementation hints.

Returns:

The factory.

Throws:

FactoryRegistryException - if the factory creation failed.