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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.framework.wiring;

import org.osgi.annotation.versioning.ProviderType;
import org.osgi.resource.Wire;

/**
 * A wire connecting a {@link BundleCapability} to a {@link BundleRequirement}.
 * 
 * @ThreadSafe
 * @author $Id: 9877055d8ebbe52b82ec16b876d4491a47a106ef $
 */
@ProviderType
public interface BundleWire extends Wire {
	/**
	 * Returns the {@link BundleCapability} for this wire.
	 * 
	 * @return The {@link BundleCapability} for this wire.
	 */
	@Override
	BundleCapability getCapability();

	/**
	 * Return the {@link BundleRequirement} for this wire.
	 * 
	 * @return The {@link BundleRequirement} for this wire.
	 */
	@Override
	BundleRequirement getRequirement();

	/**
	 * Returns the bundle wiring {@link BundleWiring#getProvidedWires(String)
	 * providing} the {@link #getCapability() capability}.
	 * 
	 * 
	 * The bundle revision referenced by the returned bundle wiring may differ
	 * from the bundle revision referenced by the {@link #getCapability()
	 * capability}.
	 * 
	 * @return The bundle wiring providing the capability. If the bundle wiring
	 *         providing the capability is not {@link BundleWiring#isInUse() in
	 *         use}, {@code null} will be returned.
	 */
	BundleWiring getProviderWiring();

	/**
	 * Returns the bundle wiring who
	 * {@link BundleWiring#getRequiredWires(String) requires} the
	 * {@link #getCapability() capability}.
	 * 
	 * 

	 * The bundle revision referenced by the returned bundle wiring may differ
	 * from the bundle revision referenced by the {@link #getRequirement()
	 * requirement}.
	 * 
	 * @return The bundle wiring whose requirement is wired to the capability.
	 *         If the bundle wiring requiring the capability is not
	 *         {@link BundleWiring#isInUse() in use}, {@code null} will be
	 *         returned.
	 */
	BundleWiring getRequirerWiring();

	/**
	 * Returns the resource providing the {@link #getCapability() capability}.
	 * 
	 * 

	 * The returned resource may differ from the resource referenced by the
	 * {@link #getCapability() capability}.
	 * 
	 * 

	 * This method returns the same value as {@link #getProviderWiring()}.
	 * {@link BundleWiring#getRevision() getRevision()}.
	 * 
	 * @return The resource providing the capability.
	 * @since 1.1
	 */
	@Override
	BundleRevision getProvider();

	/**
	 * Returns the resource who {@link #getRequirement() requires} the
	 * {@link #getCapability() capability}.
	 * 
	 * 

	 * The returned resource may differ from the resource referenced by the
	 * {@link #getRequirement() requirement}.
	 * 
	 * 
	 * This method returns the same value as {@link #getRequirerWiring()}.
	 * {@link BundleWiring#getRevision() getRevision()}.
	 * 
	 * @return The resource who requires the capability.
	 * @since 1.1
	 */
	@Override
	BundleRevision getRequirer();
}