Copyright (c) 2004, 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
/*******************************************************************************
 * Copyright (c) 2004, 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.core.commands.contexts;

import org.eclipse.core.commands.common.AbstractNamedHandleEvent;

An instance of this class describes changes to an instance of
IContext.

This class is not intended to be extended by clients.

See Also:
IContextListener.contextChanged(ContextEvent)
Since:
3.1/**
 * An instance of this class describes changes to an instance of
 * <code>IContext</code>.
 * <p>
 * This class is not intended to be extended by clients.
 * </p>
 *
 * @since 3.1
 * @see IContextListener#contextChanged(ContextEvent)
 */
public final class ContextEvent extends AbstractNamedHandleEvent {

	
The bit used to represent whether the context has changed its parent.
/**
	 * The bit used to represent whether the context has changed its parent.
	 */
	private static final int CHANGED_PARENT_ID = LAST_USED_BIT << 1;

	
The context that has changed. This value is never null.
/**
	 * The context that has changed. This value is never <code>null</code>.
	 */
	private final Context context;

	
Creates a new instance of this class.
Params:
context – 
           the instance of the interface that changed; must not be
           null.
definedChanged – 
           true, iff the defined property changed.
nameChanged – 
           true, iff the name property changed.
descriptionChanged – 
           true, iff the description property changed.
parentIdChanged – 
           true, iff the parentId property changed./**
	 * Creates a new instance of this class.
	 *
	 * @param context
	 *            the instance of the interface that changed; must not be
	 *            <code>null</code>.
	 * @param definedChanged
	 *            <code>true</code>, iff the defined property changed.
	 * @param nameChanged
	 *            <code>true</code>, iff the name property changed.
	 * @param descriptionChanged
	 *            <code>true</code>, iff the description property changed.
	 * @param parentIdChanged
	 *            <code>true</code>, iff the parentId property changed.
	 */
	public ContextEvent(final Context context, final boolean definedChanged,
			final boolean nameChanged, final boolean descriptionChanged,
			final boolean parentIdChanged) {
		super(definedChanged, descriptionChanged, nameChanged);

		if (context == null) {
			throw new NullPointerException();
		}
		this.context = context;

		if (parentIdChanged) {
			changedValues |= CHANGED_PARENT_ID;
		}
	}

	
Returns the instance of the interface that changed.
Returns:
the instance of the interface that changed. Guaranteed not to be
        null./**
	 * Returns the instance of the interface that changed.
	 *
	 * @return the instance of the interface that changed. Guaranteed not to be
	 *         <code>null</code>.
	 */
	public final Context getContext() {
		return context;
	}

	
Returns whether or not the parentId property changed.
Returns:
true, iff the parentId property changed./**
	 * Returns whether or not the parentId property changed.
	 *
	 * @return <code>true</code>, iff the parentId property changed.
	 */
	public final boolean isParentIdChanged() {
		return ((changedValues & CHANGED_PARENT_ID) != 0);
	}
}