UuID.java

/*******************************************************************************
 * Copyright (c) 2015 Composent 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:
 *   Scott Lewis - initial API and implementation
 ******************************************************************************/
package org.eclipse.ecf.core.identity;

import java.net.URI;
import java.util.UUID;
import org.eclipse.core.runtime.Assert;

/**
 * @since 3.5
 */
public class UuID extends BaseID {

	private static final long serialVersionUID = -2586540125532542205L;

	public static class UuIDNamespace extends Namespace {

		private static final long serialVersionUID = -7708511830843215943L;
		public static final String SCHEME = "uuid";

		public UuIDNamespace() {
			this(UuID.class.getName(), "UuID Namespace");
		}

		public UuIDNamespace(String name, String description) {
			super(name, description);
		}

		@Override
		public ID createInstance(Object[] parameters) throws IDCreateException {
			try {
				String init = getInitStringFromExternalForm(parameters);
				if (init != null)
					return new UuID(this, UUID.fromString(init));
				if (parameters != null && parameters.length > 0) {
					if (parameters[0] instanceof String)
						return new UuID(this,
								UUID.fromString((String) parameters[0]));
					else if (parameters[0] instanceof URI)
						return new UuID(this,
								UUID.fromString(((URI) parameters[0])
										.getSchemeSpecificPart()));
					else if (parameters[0] instanceof UUID)
						return new UuID(this, (UUID) parameters[0]);
				}
				// If we get here, then use random
				return new UuID(this, UUID.randomUUID());
			} catch (Exception e) {
				throw new IDCreateException(UuIDNamespace.this.getName()
						+ " createInstance()", e); //$NON-NLS-1$
			}
		}

		@Override
		public String getScheme() {
			return SCHEME;
		}

		@Override
		public Class<?>[][] getSupportedParameterTypes() {
			return new Class[][] { { String.class }, { UUID.class },
					{ URI.class } };
		}
	}

	protected final UUID uuid;

	protected UuID(UuIDNamespace ns, UUID uuid) {
		super(ns);
		Assert.isNotNull(uuid);
		this.uuid = uuid;
	}

	protected int namespaceCompareTo(BaseID obj) {
		return getName().compareTo(obj.getName());
	}

	protected boolean namespaceEquals(BaseID obj) {
		if (!(obj instanceof UuID))
			return false;
		UuID o = (UuID) obj;
		return uuid.equals(o.uuid);
	}

	protected String namespaceGetName() {
		return uuid.toString();
	}

	protected int namespaceHashCode() {
		return uuid.hashCode() ^ getClass().hashCode();
	}

	public UUID getUUID() {
		return uuid;
	}

	@Override
	public String toString() {
		return "UuID[uuid=" + uuid + "]";
	}

}