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## com.bea.p13n.events
Class Event

    java.lang.Object
      |
      +--com.bea.p13n.property.AbstractConfigurableEntity
            |
            +--com.bea.p13n.events.Event

All Implemented Interfaces:
  ConfigurableEntity, EventConstants, Serializable

Direct Known Subclasses:
  TrackingEvent

public class Event
extends AbstractConfigurableEntity
implements ConfigurableEntity, Serializable, EventConstants

An event object. An event is characterized by having a type (some name) and a timestamp (when the event occurred). Once the event is created, it can not change type or time stamp.

An Event also has named attributes (as in a Map). The attribute names are strings, but the values can be any serializable object.

Event mimics ConfigurableEntity by implementing only one method - getProperty. Other methods of ConfigurableEntity are not supported and will throw UnsupportedOperationException if used.

See Also:
  Serialized Form

Field Summary

Fields inherited from class com.bea.p13n.property.AbstractConfigurableEntity
`CE_METHOD_CACHE, instanceClass, PREFIX_GET, PREFIX_SET, propertyCache, textFormatter`

Fields inherited from interface com.bea.p13n.property.ConfigurableEntity
`RESERVED_PROPERTY_SET`

Fields inherited from interface com.bea.p13n.events.EventConstants
`TYPE_ALL`

Constructor Summary
`Event(String theType)` Construct a new Event.
`Event(String theType, long theTimeStamp)` Construct a new Event.

Method Summary
`String` | `getApplication()` Get the application name that dispatched this event.
`Object` | `getAttribute(String theKey)` Get named event attribute.
`Iterator` | `getAttributeNames()` Return the attribute names that have been set on this event.
`Object` | `getProperty(String propertySet, String propertyName)` Mimics the `getProperty` method on thr `ConfigurableEntity` interface.
`long` | `getTimeStamp()` Get the time stamp of this event (usually system time when the Event was constructed).
`String` | `getType()` Get the type of this event.
`Object` | `removeAttribute(String theKey)` Remove the attribute.
`void` | `setApplication(String appName)` Set the application name for this event.
`void` | `setAttribute(String theKey, Serializable theValue)` Set a named event attribute.
`String` | `toString()` Return a string representation of the Event.

Methods inherited from class com.bea.p13n.property.AbstractConfigurableEntity
`createMapKey, getCachedProperty, getExplicitProperty, getExplicitSetter, getImplicitProperty, getJndiName, getPkString, getPropertyAsString, getPropertyCache, getPropertyNoDefault, getUniqueId, hasExplicitGetter, hasExplicitSetter, removeExplicitProperty, removeProperty, setExplicitProperty, setProperty, upcaseFirst`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Methods inherited from interface com.bea.p13n.property.ConfigurableEntity
`getJndiName, getPkString, getPropertyAsString, getPropertyNoDefault, getUniqueId, removeProperty, setProperty`

Constructor Detail

### Event

    public Event(String theType)

  Construct a new Event. The event's type is required. The type may not be null nor an empty string. The type is simply the name of the event that occurred. It is used for dispatching the event to interested listeners. The event's timstamp is also set from the current system time.

Parameters:
  `theType` - the event type.
Throws:
  `IllegalArgumentException` - if theType is null or an empty string.

### Event

    public Event(String theType,
                 long theTimeStamp)

  Construct a new Event. The event's type is required. The type may not be null nor an empty string. The type is simply the name of the event that occurred. It is used for dispatching the event to interested listeners. The event's timstamp is also set from the current system time, and the application name is set from the calling component's application context.

  This constructor is provided so that an Event can be created when the time of the "event trigger" is not the same as the time when this object (that represents that trigger) is created. This constructor would not normally be used - normal applications should use the Event(String theType) constructor.

Parameters:
  `theType` - the event type.
  `theTimeStamp` - the timestamp for the event, in milliseconds since midnight, January 1, 1970 UTC.
Throws:
  `IllegalArgumentException` - if theType is null or an empty string.

Method Detail

### setApplication

    public void setApplication(String appName)

  Set the application name for this event. The application is mutable because it may not be set by the object that created the Event object (eg, in the case of externally-connected applications). If the application name is null when the object is dispatched, the EventServiceBean will call this method with its application name.

### getApplication

    public String getApplication()

  Get the application name that dispatched this event.

  Returns:
    application name, as named when this Event object was dispatched.

### getType

    public String getType()

  Get the type of this event.

  Returns:
    the event type, as named when this Event object was created.

### getTimeStamp

    public long getTimeStamp()

  Get the time stamp of this event (usually system time when the Event was constructed).

  Returns:
    the time stamp, measured in milliseconds since midnight, January 1, 1970 UTC.

### setAttribute

    public void setAttribute(String theKey,
                             Serializable theValue)

  Set a named event attribute.

  Parameters:
    `theKey` - the attribute name. Can not be null.
    `theValue` - the value of the attribute.
  Throws:
    `NullPointerException` - if theKey is null.

### removeAttribute

    public Object removeAttribute(String theKey)

  Remove the attribute.

  Parameters:
    `theKey` - the attribute name.
  Returns:
    previous value associated with theKey, or null if there was no mapping for theKey.

### getAttribute

    public Object getAttribute(String theKey)

  Get named event attribute.

  Returns:
    value associated with theKey, or null if there was no mapping for theKey.

### getAttributeNames

    public Iterator getAttributeNames()

  Return the attribute names that have been set on this event. This iterator provides a "read-only" view of the attributes - remove is not supported.

### toString

    public String toString()

  Return a string representation of the Event. Returns as:

        Event [type @ timeStamp] { attributeKey=attributeValue, ... }

  The time stamp is formated using java.util.Date.toString(). The attribute values are converted to string using String.valueOf().

  Overrides:
    `toString` in class `Object`

### getProperty

    public Object getProperty(String propertySet,
                              String propertyName)

  Mimics the `getProperty` method on thr `ConfigurableEntity` interface.
  This method delegates to the `getAttribute`, passing the `propertyName` parameter as the `key` argument. It is assumed that the `propertySet` parameter is the same as the event type.

  Specified by:
    `getProperty` in interface `ConfigurableEntity`
  Overrides:
    `getProperty` in class `AbstractConfigurableEntity`
  Parameters:
    `propertySet` - The name of the property set to look in
    `propertyName` - The name of the property to retrieve.
  Returns:
    the value for this property, or null if all searches failed

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