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/*
 * Copyright (c) OSGi Alliance (2008, 2013). 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 map entry.
 * 
 * This type is used by {@link MapMetadata}, {@link PropsMetadata} and
 * {@link ServiceMetadata}.
 * 
 * @ThreadSafe
 * @author $Id: 0148e116bfa36331c0a9a309509e80fd4f8635a4 $
 */
public interface MapEntry {
	/**
	 * Return the Metadata for the key of the map entry.
	 * 
	 * This is specified by the {@code key} attribute or element.
	 * 
	 * @return The Metadata for the key of the map entry. This must not be
	 *         {@code null}.
	 */
	NonNullMetadata getKey();

	/**
	 * Return the Metadata for the value of the map entry.
	 * 
	 * This is specified by the {@code value} attribute or element.
	 * 
	 * @return The Metadata for the value of the map entry. This must not be
	 *         {@code null}.
	 */
	Metadata getValue();
}