org.apache.commons.configuration2.builder

## Class EventListenerParameters

- java.lang.Object
- - org.apache.commons.configuration2.builder.EventListenerParameters

- All Implemented Interfaces:
    BuilderParameters, EventListenerProvider

      public class EventListenerParameters
      extends Object
      implements BuilderParameters, EventListenerProvider

  A specialized parameters implementation for `BasicConfigurationBuilder` which allows for a convenient event listener initialization.

  This class offers a fluent interface for registering event listeners. A fully initialized instance can be passed to the `BasicConfigurationBuilder.configure(BuilderParameters...)` method. All event listeners which have been registered at the instance are then copied over to the configuration builder.

  The code fragment below shows a typical usage scenario:

       BasicConfigurationBuilder<Configuration> builder =
               new BasicConfigurationBuilder<Configuration>(
                       PropertiesConfiguration.class)
                       .configure(new EventListenerParameters().addEventListener(
                               ConfigurationEvent.ANY, myListener));

  In order to support a configuration builder's `configure()` method, this class implements the `BuilderParameters` interface. However, this is just a dummy implementation; no parameters are propagated to the builder.

  Since:
    2.0
  Version:
    $Id: EventListenerParameters.java 1679772 2015-05-16 17:41:17Z oheger $

- - ### Field Summary

    - ### Fields inherited from interface org.apache.commons.configuration2.builder.BuilderParameters

      `RESERVED_PARAMETER_PREFIX`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `EventListenerParameters()` Creates a new instance of `EventListenerParameters`.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `<T extends Event> EventListenerParameters` | `addEventListener(EventListenerRegistrationData<T> registrationData)` Adds the specified `EventListenerRegistrationData` instance to this object.
    `<T extends Event> EventListenerParameters` | `addEventListener(EventType<T> eventType, EventListener<? super T> listener)` Adds an event listener of the specified event type to this object.
    `EventListenerList` | `getListeners()` Returns an `EventListenerList` object with information about event listener registrations.
    `Map<String,Object>` | `getParameters()` Returns a map with all parameters defined by this objects.

    - ### Methods inherited from class java.lang.Object

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

- - ### Constructor Detail

    - #### EventListenerParameters

          public EventListenerParameters()

      Creates a new instance of `EventListenerParameters`.

  - ### Method Detail

    - #### addEventListener

          public <T extends Event> EventListenerParameters addEventListener(EventType<T> eventType,
                                                                            EventListener<? super T> listener)

      Adds an event listener of the specified event type to this object.
      Type Parameters:
        `T` - the event type
      Parameters:
        `eventType` - the event type object
        `listener` - the event listener
      Returns:
        a reference to this object for method chaining

    - #### addEventListener

          public <T extends Event> EventListenerParameters addEventListener(EventListenerRegistrationData<T> registrationData)

      Adds the specified `EventListenerRegistrationData` instance to this object.
      Type Parameters:
        `T` - the event type of the contained event listener
      Parameters:
        `registrationData` - the registration object to be added
      Returns:
        a reference to this object for method chaining

    - #### getParameters

          public Map<String,Object> getParameters()

      Returns a map with all parameters defined by this objects. The keys of the map correspond to concrete properties supported by the `Configuration` implementation class the builder produces. The values are the corresponding property values. The return value must not be null. This implementation returns an empty map.
      Specified by:
        `getParameters` in interface `BuilderParameters`
      Returns:
        a map with builder parameters

    - #### getListeners

          public EventListenerList getListeners()

      Description copied from interface: `EventListenerProvider`
      Returns an `EventListenerList` object with information about event listener registrations. All listeners contained in this object are added to the processing `ConfigurationBuilder`.
      Specified by:
        `getListeners` in interface `EventListenerProvider`
      Returns:
        the `EventListenerList` with event listener registrations (must not be null)

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