Transformer.java

/*******************************************************************************
 * 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;


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.transform.internal.TransformationStage;
import org.eclipse.virgo.util.common.GraphNode;


/**
 * A <code>Transformer</code> is driven during the {@link TransformationStage} of deployment.
 * <p />
 * A <code>Transformer</code> can be contributed to the transformation stage of deployment by
 * publishing it as an OSGi service.
 * <p />
 *
 * <strong>Concurrent Semantics</strong><br />
 *
 * Implementations <strong>must</strong> be thread-safe.
 *
 */
public interface Transformer {
    void transform(GraphNode<InstallArtifact> installGraph, InstallEnvironment installEnvironment) throws DeploymentException;
}