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/*
* Copyright (c) OSGi Alliance (2011, 2012). 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.framework.wiring;
import java.util.List;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleReference;
/**
* The {@link BundleRevision bundle revisions} of a bundle. When a bundle is
* installed and each time a bundle is updated, a new bundle revision of the
* bundle is created. For a bundle that has not been uninstalled, the most
* recent bundle revision is defined to be the current bundle revision. A bundle
* in the UNINSTALLED state does not have a current revision. An in use bundle
* revision is associated with an {@link BundleWiring#isInUse() in use}
* {@link BundleWiring}. The current bundle revision, if there is one, and all
* in use bundle revisions are returned.
*
* <p>
* The bundle revisions for a bundle can be obtained by calling
* {@link Bundle#adapt(Class) bundle.adapt}({@link BundleRevisions}.class).
* {@link #getRevisions()} on the bundle.
*
* @ThreadSafe
* @noimplement
* @version $Id$
*/
public interface BundleRevisions extends BundleReference {
/**
* Return the bundle revisions for the {@link BundleReference#getBundle()
* referenced} bundle.
*
* <p>
* The result is a list containing the current bundle revision, if there is
* one, and all in use bundle revisions. The list may also contain
* intermediate bundle revisions which are not in use.
*
* <p>
* The list is ordered in reverse chronological order such that the first
* item is the most recent bundle revision and last item is the oldest
* bundle revision.
*
* <p>
* Generally the list will have at least one bundle revision for the bundle:
* the current bundle revision. However, for an uninstalled bundle with no
* in use bundle revisions, the list may be empty.
*
* @return A list containing a snapshot of the {@link BundleRevision}s for
* the referenced bundle.
*/
List<BundleRevision> getRevisions();
}
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