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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) 2011, 2012 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.osgi.service.resolver;

/**
 * A state wire represents a decision made by a resolver to wire a requirement to a capability.
 * There are 4 parts to a state wire.
 * 
 * The requirement which may have been specified by a host bundle or one of its attached fragments.
 * The host bundle which is associated with the requirement.  There are cases where the host
 * bundle may not be the same as the bundle which declared the requirement.  For example, if a fragment
 * specifies additional requirements.
 * The capability which may have been specified by a host bundle or one of its attached fragments.
 * The host bundle which is associated with the capability.  There are cases where the host
 * bundle may not be the same as the bundle which declared the capability.  For example, if a fragment
 * specifies additional capabilities.
 * 
 * @since 3.7
 */
public class StateWire {
	private final BundleDescription requirementHost;
	private final VersionConstraint declaredRequirement;
	private final BundleDescription capabilityHost;
	private final BaseDescription declaredCapability;

	/**
	 * Constructs a new state wire.
	 * @param requirementHost the bundle hosting the requirement.
	 * @param declaredRequirement the declared requirement.  The bundle declaring the requirement may be different from the requirement host.
	 * @param capabilityHost the bundle hosting the capability.
	 * @param declaredCapability the declared capability.  The bundle declaring the capability may be different from the capability host.
	 */
	public StateWire(BundleDescription requirementHost, VersionConstraint declaredRequirement, BundleDescription capabilityHost, BaseDescription declaredCapability) {
		super();
		this.requirementHost = requirementHost;
		this.declaredRequirement = declaredRequirement;
		this.capabilityHost = capabilityHost;
		this.declaredCapability = declaredCapability;

	}

	/**
	 * Gets the requirement host.
	 * @return the requirement host.
	 */
	public BundleDescription getRequirementHost() {
		return requirementHost;
	}

	/**
	 * Gets the declared requirement.
	 * @return the declared requirement.
	 */
	public VersionConstraint getDeclaredRequirement() {
		return declaredRequirement;
	}

	/**
	 * gets the capability host.
	 * @return the capability host.
	 */
	public BundleDescription getCapabilityHost() {
		return capabilityHost;
	}

	/**
	 * gets the declared capability.
	 * @return the declared capability.
	 */
	public BaseDescription getDeclaredCapability() {
		return declaredCapability;
	}
}