bundles/org.eclipse.equinox.p2.metadata/src/org/eclipse/equinox/internal/provisional/p2/metadata/ProvidedCapability.java

/*******************************************************************************
 * Copyright (c) 2007, 2009 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *     EclipseSource - ongoing development
 *******************************************************************************/
package org.eclipse.equinox.internal.provisional.p2.metadata;

import org.eclipse.core.runtime.Assert;
import org.eclipse.equinox.internal.provisional.p2.core.Version;

/**
 * Describes a capability as exposed or required by an installable unit
 */
public class ProvidedCapability implements IProvidedCapability {
	private final String name;
	private final String namespace;
	private final Version version;

	ProvidedCapability(String namespace, String name, Version version) {
		Assert.isNotNull(namespace);
		Assert.isNotNull(name);
		this.namespace = namespace;
		this.name = name;
		this.version = version == null ? Version.emptyVersion : version;
	}

	public boolean equals(Object other) {
		if (other == null)
			return false;
		if (!(other instanceof IProvidedCapability))
			return false;
		IProvidedCapability otherCapability = (IProvidedCapability) other;
		if (!(namespace.equals(otherCapability.getNamespace())))
			return false;
		if (!(name.equals(otherCapability.getName())))
			return false;
		return version.equals(otherCapability.getVersion());
	}

	public String getName() {
		return name;
	}

	public String getNamespace() {
		return namespace;
	}

	public Version getVersion() {
		return version;
	}

	public int hashCode() {
		return namespace.hashCode() * name.hashCode() * version.hashCode();
	}

	/**
	 * Returns whether this provided capability satisfies the given required capability.
	 * @return <code>true</code> if this capability satisfies the given required
	 * capability, and <code>false</code> otherwise.
	 */
	public boolean satisfies(IRequiredCapability candidate) {
		if (getName() == null || !getName().equals(candidate.getName()))
			return false;
		if (getNamespace() == null || !getNamespace().equals(candidate.getNamespace()))
			return false;
		return candidate.getRange().isIncluded(version);
	}

	public String toString() {
		return namespace + '/' + name + '/' + version;
	}

}