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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 org.osgi.annotation.versioning.ConsumerType;

/**
 * A wire connecting a {@link Capability} to a {@link Requirement}.
 * 
 * 
 * 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: a0d1c39e16788708ffab9bb00707554f97f09998 $
 */
@ConsumerType
public interface Wire {
	/**
	 * Returns the {@link Capability} for this wire.
	 * 
	 * @return The {@link Capability} for this wire.
	 */
	Capability getCapability();

	/**
	 * Returns the {@link Requirement} for this wire.
	 * 
	 * @return The {@link Requirement} for this wire.
	 */
	Requirement getRequirement();

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

	 * The returned resource may differ from the resource referenced by the
	 * {@link #getCapability() capability}.
	 * 
	 * @return The resource providing the capability.
	 */
	Resource 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}.
	 * 
	 * @return The resource who requires the capability.
	 */
	Resource getRequirer();

	/**
	 * Compares this {@code Wire} to another {@code Wire}.
	 * 
	 * 
	 * This {@code Wire} is equal to another {@code Wire} if they have the same
	 * capability, requirement, provider and requirer.
	 * 
	 * @param obj The object to compare against this {@code Wire}.
	 * @return {@code true} if this {@code Wire} is equal to the other object;
	 *         {@code false} otherwise.
	 */
	@Override
	boolean equals(Object obj);

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