org.osgi.service.packageadmin.RequiredBundle Maven / Gradle / Ivy
/*
* Copyright (c) OSGi Alliance (2004, 2008). All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.osgi.service.packageadmin;
import org.osgi.framework.Bundle;
import org.osgi.framework.Version;
/**
* A required bundle.
*
* Objects implementing this interface are created by the Package Admin service.
*
*
* The term required bundle refers to a resolved bundle that has a
* bundle symbolic name and is not a fragment. That is, a bundle that may be
* required by other bundles. This bundle may or may not be currently required
* by other bundles.
*
*
* The information about a required bundle provided by this object may change. A
* RequiredBundle object becomes stale if an exported package of
* the bundle it references has been updated or removed as a result of calling
* PackageAdmin.refreshPackages()).
*
* If this object becomes stale, its getSymbolicName() and
* getVersion() methods continue to return their original values,
* isRemovalPending() returns true, and getBundle()
* and getRequiringBundles() return null.
*
* @since 1.2
* @ThreadSafe
* @version $Revision: 5673 $
*/
public interface RequiredBundle {
/**
* Returns the symbolic name of this required bundle.
*
* @return The symbolic name of this required bundle.
*/
public String getSymbolicName();
/**
* Returns the bundle associated with this required bundle.
*
* @return The bundle, or null if this
* RequiredBundle object has become stale.
*/
public Bundle getBundle();
/**
* Returns the bundles that currently require this required bundle.
*
*
* If this required bundle is required and then re-exported by another
* bundle then all the requiring bundles of the re-exporting bundle are
* included in the returned array.
*
* @return An array of bundles currently requiring this required bundle, or
* null if this RequiredBundle object
* has become stale. The array will be empty if no bundles require
* this required package.
*/
public Bundle[] getRequiringBundles();
/**
* Returns the version of this required bundle.
*
* @return The version of this required bundle, or
* {@link Version#emptyVersion} if no version information is
* available.
*/
public Version getVersion();
/**
* Returns true if the bundle associated with this
* RequiredBundle object has been updated or uninstalled.
*
* @return true if the required bundle has been updated or
* uninstalled, or if the RequiredBundle object has
* become stale; false otherwise.
*/
public boolean isRemovalPending();
}