org.osgi.service.event

Class Event

java.lang.Object

org.osgi.service.event.Event

public class Event
extends Object

An event. Event objects are delivered to EventHandler services which subscribe to the topic of the event.

"Immutable"

Constructor Summary

Constructors

Constructor and Description
Event(String topic, Dictionary<String,?> properties) Constructs an event.
Event(String topic, Map<String,?> properties) Constructs an event.

Method Summary

Methods

Modifier and Type	Method and Description
boolean	containsProperty(String name) Indicate the presence of an event property.
boolean	equals(Object object) Compares this Event object to another object.
Object	getProperty(String name) Retrieve the value of an event property.
String[]	getPropertyNames() Returns a list of this event's property names.
String	getTopic() Returns the topic of this event.
int	hashCode() Returns a hash code value for this object.
boolean	matches(Filter filter) Tests this event's properties against the given filter using a case sensitive match.
String	toString() Returns the string representation of this event.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

Event

public Event(String topic,
     Map<String,?> properties)

Constructs an event.

Parameters:

topic - The topic of the event.

properties - The event's properties (may be null). A property whose key is not of type String will be ignored. If the specified properties is an EventProperties object, then it will be directly used. Otherwise, a copy of the specified properties is made.

Throws:

IllegalArgumentException - If topic is not a valid topic name.

Since:

1.2

Event

public Event(String topic,
     Dictionary<String,?> properties)

Constructs an event.

Parameters:

topic - The topic of the event.

properties - The event's properties (may be null). A property whose key is not of type String will be ignored. A copy of the specified properties is made.

Throws:

IllegalArgumentException - If topic is not a valid topic name.

Method Detail

getProperty

public final Object getProperty(String name)

Retrieve the value of an event property. The event topic may be retrieved with the property name "event.topics".

Parameters:

name - The name of the property to retrieve.

Returns:

The value of the property, or null if not found.

containsProperty

public final boolean containsProperty(String name)

Indicate the presence of an event property. The event topic is present using the property name "event.topics".

Parameters:

name - The name of the property.

Returns:

true if a property with the specified name is in the event. This property may have a null value. false otherwise.

Since:

1.3

getPropertyNames

public final String[] getPropertyNames()

Returns a list of this event's property names. The list will include the event topic property name "event.topics".

Returns:

A non-empty array with one element per property.

getTopic

public final String getTopic()

Returns the topic of this event.

Returns:

The topic of this event.

matches

public final boolean matches(Filter filter)

Tests this event's properties against the given filter using a case sensitive match.

Parameters:

filter - The filter to test.

Returns:

true If this event's properties match the filter, false otherwise.

equals

public boolean equals(Object object)

Compares this Event object to another object.

An event is considered to be equal to another event if the topic is equal and the properties are equal. The properties are compared using the java.util.Map.equals() rules which includes identity comparison for array values.

Overrides:

equals in class Object

Parameters:

object - The Event object to be compared.

Returns:

true if object is a Event and is equal to this object; false otherwise.

hashCode

public int hashCode()

Returns a hash code value for this object.

Overrides:

hashCode in class Object

Returns:

An integer which is a hash code value for this object.

toString

public String toString()

Returns the string representation of this event.

Overrides:

toString in class Object

Returns:

The string representation of this event.