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AspectJ tools most notably contains the AspectJ compiler (AJC). AJC applies aspects to Java classes during compilation, fully replacing Javac for plain Java classes and also compiling native AspectJ or annotation-based @AspectJ syntax. Furthermore, AJC can weave aspects into existing class files in a post-compile binary weaving step. This library is a superset of AspectJ weaver and hence also of AspectJ runtime.

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/*
 * Copyright (c) OSGi Alliance (2010, 2015). 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.framework.wiring;

import java.util.Map;
import org.osgi.annotation.versioning.ProviderType;
import org.osgi.framework.namespace.AbstractWiringNamespace;
import org.osgi.resource.Requirement;

/**
 * A requirement that has been declared from a {@link BundleRevision bundle
 * revision}.
 * 
 * @ThreadSafe
 * @author $Id: f7e73311cfc384905cb65d9d24b12304291be2d8 $
 */
@ProviderType
public interface BundleRequirement extends Requirement {
	/**
	 * Returns the bundle revision declaring this requirement.
	 * 
	 * @return The bundle revision declaring this requirement.
	 */
	BundleRevision getRevision();

	/**
	 * Returns whether the specified capability matches this requirement.
	 * 
	 * @param capability The capability to match to this requirement.
	 * @return {@code true} if the specified capability has the same
	 *         {@link #getNamespace() namespace} as this requirement and the
	 *         filter for this requirement matches the
	 *         {@link BundleCapability#getAttributes() attributes of the
	 *         specified capability}; {@code false} otherwise.
	 */
	boolean matches(BundleCapability capability);

	/**
	 * Returns the namespace of this requirement.
	 * 
	 * @return The namespace of this requirement.
	 */
	@Override
	String getNamespace();

	/**
	 * Returns the directives of this requirement.
	 * 
	 * 
	 * All requirement directives not specified by the
	 * {@link AbstractWiringNamespace wiring namespaces} have no specified
	 * semantics and are considered extra user defined information.
	 * 
	 * @return An unmodifiable map of directive names to directive values for
	 *         this requirement, or an empty map if this requirement has no
	 *         directives.
	 */
	@Override
	Map getDirectives();

	/**
	 * Returns the attributes of this requirement.
	 * 
	 * 

	 * Requirement attributes have no specified semantics and are considered
	 * extra user defined information.
	 * 
	 * @return An unmodifiable map of attribute names to attribute values for
	 *         this requirement, or an empty map if this requirement has no
	 *         attributes.
	 */
	@Override
	Map getAttributes();

	/**
	 * Returns the resource declaring this requirement.
	 * 
	 * 
	 * This method returns the same value as {@link #getRevision()}.
	 * 
	 * @return The resource declaring this requirement. This can be {@code null}
	 *         if this requirement is synthesized.
	 * @since 1.1
	 */
	@Override
	BundleRevision getResource();
}