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/*******************************************************************************
* Copyright (c) 2007 IBM Corporation 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:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.equinox.p2.metadata;
import org.osgi.framework.Version;
/**
* Provide standardized artifact information to uniquely identify the
* corresponding bytes (perhaps not stored as a file).
* <p>
* Artifact keys represent both a unique opaque identifier as well as structured
* and standardized pieces of information.
*/
public interface IArtifactKey {
/**
* Returns the namespace for this artifact key. The returned value can never be empty.
* @return the namespace segment of the key.
*/
public String getNamespace();
/**
* Returns the classifier for this artifact key. The returned value can be empty.
* @return the classifier segment of the key.
*/
public String getClassifier();
/**
* Returns the id for this artifact key. The returned value can be empty.
* @return the classifier segment of the key.
*/
public String getId();
/**
* Returns the version for this artifact key.
* @return the version segment of the key.
*/
public Version getVersion();
/**
* Returns the canonical string form of this artifact key.
* @return the canonical string representing this key
*/
public String toExternalForm();
}
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