/*******************************************************************************
* Copyright (c) 2008, 2011 VMware Inc. and others
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* VMware Inc. - initial contribution
* EclipseSource - Bug 358442 Change InstallArtifact graph from a tree to a DAG
*******************************************************************************/
package org.eclipse.virgo.kernel.install.pipeline.stage.transform.internal;
import java.util.List;
import org.eclipse.virgo.nano.deployer.api.core.DeploymentException;
import org.eclipse.virgo.kernel.install.artifact.InstallArtifact;
import org.eclipse.virgo.kernel.install.environment.InstallEnvironment;
import org.eclipse.virgo.kernel.install.pipeline.stage.AbstractPipelineStage;
import org.eclipse.virgo.kernel.install.pipeline.stage.transform.Transformer;
import org.eclipse.virgo.kernel.osgi.framework.OsgiFrameworkUtils;
import org.eclipse.virgo.kernel.osgi.framework.OsgiServiceHolder;
import org.eclipse.virgo.kernel.osgi.framework.UnableToSatisfyBundleDependenciesException;
import org.eclipse.virgo.util.common.GraphNode;
import org.osgi.framework.BundleContext;
/**
* A pipeline stage that drives {@link Transformer Transformers}. Transformers are retrieved from the OSGi service
* registry and are driven in the order defined by their service ranking and service id.
* <p />
*
* <strong>Concurrent Semantics</strong><br />
*
* Thread-safe.
*
*/
public final class TransformationStage extends AbstractPipelineStage {
private final BundleContext bundleContext;
public TransformationStage(BundleContext bundleContext) {
this.bundleContext = bundleContext;
}
/**
* {@inheritDoc}
*/
@Override
protected void doProcessGraph(GraphNode<InstallArtifact> installGraph, InstallEnvironment installEnvironment) throws DeploymentException,
UnableToSatisfyBundleDependenciesException {
List<OsgiServiceHolder<Transformer>> services = OsgiFrameworkUtils.getServices(this.bundleContext, Transformer.class);
for (OsgiServiceHolder<Transformer> transformerHolder : services) {
transformerHolder.getService().transform(installGraph, installEnvironment);
this.bundleContext.ungetService(transformerHolder.getServiceReference());
}
}
}