/*******************************************************************************
 * Copyright (c) 2000, 2015 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.ui.activities;

/**
 * An instance of this class describes changes to an instance of
 * <code>IIdentifier</code>. This class does not give details as to the
 * specifics of a change, only that the given property on the source object has
 * changed.
 *
 * <p>
 * This class is not intended to be extended by clients.
 * </p>
 *
 * @since 3.0
 * @see IIdentifierListener#identifierChanged(IdentifierEvent)
 */
public final class IdentifierEvent {
	private boolean activityIdsChanged;

	private boolean enabledChanged;

	private IIdentifier identifier;

	/**
	 * Creates a new instance of this class.
	 *
	 * @param identifier         the instance of the interface that changed.
	 * @param activityIdsChanged <code>true</code>, iff the activityIds property
	 *                           changed.
	 * @param enabledChanged     <code>true</code>, iff the enabled property
	 *                           changed.
	 */
	public IdentifierEvent(IIdentifier identifier, boolean activityIdsChanged, boolean enabledChanged) {
		if (identifier == null) {
			throw new NullPointerException();
		}

		this.identifier = identifier;
		this.activityIdsChanged = activityIdsChanged;
		this.enabledChanged = enabledChanged;
	}

	/**
	 * Returns the instance of the interface that changed.
	 *
	 * @return the instance of the interface that changed. Guaranteed not to be
	 *         <code>null</code>.
	 */
	public IIdentifier getIdentifier() {
		return identifier;
	}

	/**
	 * Returns whether or not the activityIds property changed.
	 *
	 * @return <code>true</code>, iff the activityIds property changed.
	 */
	public boolean hasActivityIdsChanged() {
		return activityIdsChanged;
	}

	/**
	 * Returns whether or not the enabled property changed.
	 *
	 * @return <code>true</code>, iff the enabled property changed.
	 */
	public boolean hasEnabledChanged() {
		return enabledChanged;
	}
}
