/*
 * Copyright (c) OSGi Alliance (2008, 2010). All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.osgi.service.blueprint.reflect;

/**
 * Metadata for a value that cannot {@code null}. All Metadata subtypes
 * extend this type except for {@link NullMetadata}.
 * 
 * <p>
 * This Metadata type is used for keys in Maps because they cannot be
 * {@code null}.
 * 
 * @ThreadSafe
 * @version $Id: 33c902a7aa78a6e7b679dfc9064df8ad83a17024 $
 */
public interface NonNullMetadata extends Metadata {
	// marker interface
}
