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/*******************************************************************************
 * Copyright (c) 2004, 2012 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.osgi.service.resolver;

import java.util.Map;
import org.osgi.framework.Version;
import org.osgi.framework.wiring.BundleCapability;

/**
 * This class represents a base description object for a state. All description
 * objects in a state have a name and a version.
 * 
 * This interface is not intended to be implemented by clients. The
 * {@link StateObjectFactory} should be used to construct instances.
 * 
 * 
 * @since 3.1
 * @noimplement This interface is not intended to be implemented by clients.
 */
public interface BaseDescription {
	/**
	 * Returns the name.
	 * 
	 * @return the name
	 */
	public String getName();

	/**
	 * Returns the version.
	 * 
	 * @return the version
	 */
	public Version getVersion();

	/**
	 * Returns the bundle which supplies this base description
	 * 
	 * @return the bundle which supplies this base description
	 * @since 3.2
	 */
	public BundleDescription getSupplier();

	/**
	 * Returns the directives declared with the description. This will return all
	 * known directives for the type of description. The set of directives differs
	 * for each description type.
	 * 
	 * @return the known directives declared with the description
	 * @since 3.7
	 */
	public Map getDeclaredDirectives();

	/**
	 * Returns the attributes declared with the description. This will return all
	 * known attributes for the type of description. The set of attributes differs
	 * for each description type.
	 * 
	 * @return the attributes declared with the description
	 * @since 3.7
	 */
	public Map getDeclaredAttributes();

	/**
	 * Returns the capability represented by this description. Some descriptions
	 * types may not be able to represent a capability. In such cases
	 * null is returned.
	 * 
	 * @return the capability represented by this base description
	 * @since 3.7
	 */
	public BundleCapability getCapability();

	/**
	 * Returns the user object associated to this description, or null
	 * if none exists.
	 *
	 * @return the user object associated to this description, or null
	 * @since 3.8
	 */
	public Object getUserObject();

	/**
	 * Associates a user-provided object to this description, or removes an existing
	 * association, if null is provided. The provided object is not
	 * interpreted in any ways by this description.
	 *
	 * @param userObject an arbitrary object provided by the user, or
	 *                   null
	 * @since 3.8
	 */
	public void setUserObject(Object userObject);

}