CompositeFactory

Implements: IFactory

Description

The CompositeFactory class allows you to aggregate multiple factories into a single factory component.

Important points

• When a new component is requested, it iterates through factories to locate the one able to create the requested component.
• Usually used to keep all supported factories in a single place.

Constructors

Creates a new instance of the factory.

public CompositeFactory(IFactory… factories)

• factories: IFactory… - a list of factories to embed into this factory.

Instance methods

add

Adds a factory into the list of embedded factories.

public void add(IFactory factory)

• factory: IFactory - a factory to be added.

canCreate

Checks if this factory is able to create component by a given locator.

This method searches for all registered components and returns a locator for component it is able to create that matches the given locator. If the factory is not able to create a requested component it returns null.

public Object canCreate(Object locator)

• locator: Object - a locator to identify component to be created.
• returns: Object - a locator for a component that the factory is able to create.

create

Creates a component identified by given locator.

public Object create(Object locator) throws CreateException

• locator: Object - a locator to identify component to be created.
• returns: Object - the created component.

remove

Removes a factory from the list of embedded factories.

public void remove(IFactory factory)

• factory: IFactory - the factory to remove.

Examples

{
  CompositeFactory factory = new CompositeFactory();
  factory.add(new DefaultLoggerFactory());
  factory.add(new DefaultCountersFactory());
 
  Descriptor loggerLocator = new Descriptor("*", "logger", "*", "*", "1.0");
  factory.canCreate(loggerLocator);        // Result: Descriptor("pip-service", "logger", "null", "default", "1.0")
  factory.create(loggerLocator);            // Result: created NullLogger
  }