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/*******************************************************************************
* Copyright (c) 2011, 2013 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.equinox.internal.region;
import org.eclipse.osgi.service.resolver.BundleDescription;
import org.osgi.framework.Bundle;
import org.osgi.framework.wiring.BundleRevision;
/**
* Isolates all equinox specific code to a specific class to allow the equinox packages to be optional.
*/
public class EquinoxStateHelper {
static final Worker equinoxSupport;
static {
Worker result = null;
try {
Class.forName("org.eclipse.osgi.service.resolver.BundleDescription"); //$NON-NLS-1$
result = new Worker();
} catch (ClassNotFoundException e) {
// nothing
}
equinoxSupport = result;
}
static final class Worker {
final Long getBundleId(BundleRevision revision) {
if (revision instanceof BundleDescription) {
return ((BundleDescription) revision).getBundleId();
}
return null;
}
}
public static final long getBundleId(BundleRevision revision) {
// For testability, use the bundle revision's bundle before casting to BundleDescription.
Bundle bundle = revision.getBundle();
if (bundle != null) {
return bundle.getBundleId();
}
// Note that this bit of code is never useful at runtime since the framework never uses BundleDescriptions.
// It is only useful if the region hooks are used with the old Equinox State API
Long result = equinoxSupport == null ? null : equinoxSupport.getBundleId(revision);
if (result == null)
throw new RuntimeException(String.format("Cannot determine bundle id of BundleRevision '%s'", revision)); //$NON-NLS-1$
return result;
}
}
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