Package org.osgi.service.event

Class TopicPermission

  • All Implemented Interfaces:
    Serializable, Guard
    public final class TopicPermission
extends Permission
    A bundle's authority to publish or subscribe to event on a topic.

    A topic is a slash-separated string that defines a topic.

    For example: 

     org/osgi/service/foo/FooEvent/ACTION

    TopicPermission has two actions: publish and subscribe.

    See Also:
    Serialized Form

    • Constructor Detail

      • TopicPermission

        public TopicPermission​(String name,
                       String actions)
        Defines the authority to publish and/or subscribe to a topic within the EventAdmin service.

        The name is specified as a slash-separated string. Wildcards may be used. For example: 

            org/osgi/service/fooFooEvent/ACTION
    com/isv/*
    *

        A bundle that needs to publish events on a topic must have the appropriate TopicPermission for that topic; similarly, a bundle that needs to subscribe to events on a topic must have the appropriate TopicPermssion for that topic.

        Parameters:
        name - Topic name.
        actions - publish,subscribe (canonical order).

    • Method Detail

      • implies

        public boolean implies​(Permission p)
        Determines if the specified permission is implied by this object.

        This method checks that the topic name of the target is implied by the topic name of this object. The list of TopicPermission actions must either match or allow for the list of the target object to imply the target TopicPermission action. 

            x/y/*,"publish" -> x/y/z,"publish" is true
    *,"subscribe" -> x/y,"subscribe"   is true
    *,"publish" -> x/y,"subscribe"     is false
    x/y,"publish" -> x/y/z,"publish"   is false
        Specified by:
        implies in class Permission
        Parameters:
        p - The target permission to interrogate.
        Returns:
        true if the specified TopicPermission action is implied by this object; false otherwise.

      • getActions

        public String getActions()
        Returns the canonical string representation of the TopicPermission actions.

        Always returns present TopicPermission actions in the following order: publish,subscribe.

        Specified by:
        getActions in class Permission
        Returns:
        Canonical string representation of the TopicPermission actions.

      • newPermissionCollection

        public PermissionCollection newPermissionCollection()
        Returns a new PermissionCollection object suitable for storing TopicPermission objects.
        Overrides:
        newPermissionCollection in class Permission
        Returns:
        A new PermissionCollection object.

      • equals

        public boolean equals​(Object obj)
        Determines the equality of two TopicPermission objects. This method checks that specified TopicPermission has the same topic name and actions as this TopicPermission object.
        Specified by:
        equals in class Permission
        Parameters:
        obj - The object to test for equality with this TopicPermission object.
        Returns:
        true if obj is a TopicPermission, and has the same topic name and actions as this TopicPermission object; false otherwise.

      • hashCode

        public int hashCode()
        Returns the hash code value for this object.
        Specified by:
        hashCode in class Permission
        Returns:
        A hash code value for this object.