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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 (2011, 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.resource;

import java.util.List;
import org.osgi.annotation.versioning.ConsumerType;

/**
 * A resource is the representation of a uniquely identified and typed data. A
 * resource declares requirements that need to be satisfied by capabilities
 * before it can provide its capabilities.
 * 
 * 
 * Instances of this type must be effectively immutable. That is, for a
 * given instance of this interface, the methods defined by this interface must
 * always return the same result.
 * 
 * @ThreadSafe
 * @author $Id: 6f13a1b536b116eebb255285b958d889db733939 $
 */
@ConsumerType
public interface Resource {
	/**
	 * Returns the capabilities declared by this resource.
	 * 
	 * @param namespace The namespace of the declared capabilities to return or
	 *        {@code null} to return the declared capabilities from all
	 *        namespaces.
	 * @return An unmodifiable list containing the declared {@link Capability}s
	 *         from the specified namespace. The returned list will be empty if
	 *         this resource declares no capabilities in the specified
	 *         namespace.
	 */
	List getCapabilities(String namespace);

	/**
	 * Returns the requirements declared by this bundle resource.
	 * 
	 * @param namespace The namespace of the declared requirements to return or
	 *        {@code null} to return the declared requirements from all
	 *        namespaces.
	 * @return An unmodifiable list containing the declared {@link Requirement}
	 *         s from the specified namespace. The returned list will be empty
	 *         if this resource declares no requirements in the specified
	 *         namespace.
	 */
	List getRequirements(String namespace);

	/**
	 * Compares this {@code Resource} to another {@code Resource}.
	 * 
	 * 
	 * This {@code Resource} is equal to another {@code Resource} if both have
	 * the same content and come from the same location. Location may be defined
	 * as the bundle location if the resource is an installed bundle or the
	 * repository location if the resource is in a repository.
	 * 
	 * @param obj The object to compare against this {@code Resource}.
	 * @return {@code true} if this {@code Resource} is equal to the other
	 *         object; {@code false} otherwise.
	 */
	@Override
	boolean equals(Object obj);

	/**
	 * Returns the hashCode of this {@code Resource}.
	 * 
	 * @return The hashCode of this {@code Resource}.
	 */
	@Override
	int hashCode();
}