Copyright (c) 2000, 2017 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) 2000, 2017 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.team.core.mapping.provider;

import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.Assert;
import org.eclipse.team.core.diff.provider.TwoWayDiff;
import org.eclipse.team.core.history.IFileRevision;
import org.eclipse.team.core.mapping.IResourceDiff;

Implementation of IResourceDiff. 

This class may be subclassed by clients.
Since:
3.2/**
 * Implementation of {@link IResourceDiff}.
 * <p>
 * This class may be subclassed by clients.
 *
 * @since 3.2
 */
public class ResourceDiff extends TwoWayDiff implements IResourceDiff {

	private final IFileRevision before;
	private final IFileRevision after;
	private final IResource resource;

	
Create a two-way resource diff
Params:
resource – the resource
kind – the kind of change (ADDED, REMOVED or CHANGED)
flags – additional flags that describe the change
before – the before state of the model object
after – the after state of the model object/**
	 * Create a two-way resource diff
	 * @param resource the resource
	 * @param kind the kind of change (ADDED, REMOVED or CHANGED)
	 * @param flags additional flags that describe the change
	 * @param before the before state of the model object
	 * @param after the after state of the model object
	 */
	public ResourceDiff(IResource resource, int kind, int flags, IFileRevision before, IFileRevision after) {
		super(resource.getFullPath(), kind, flags);
		this.resource = resource;
		this.before = before;
		this.after = after;
	}

	
Convenience constructor for creating a simple folder diff that consists of a
resource and a kind only. It is equivalent to
ResourceDiff(resource, kind, 0, null, null)
Params:
resource – a resource
kind –     the kind of change (ADDED, REMOVED or CHANGED)/**
	 * Convenience constructor for creating a simple folder diff that consists of a
	 * resource and a kind only. It is equivalent to
	 * <code>ResourceDiff(resource, kind, 0, null, null)</code>
	 * 
	 * @param resource a resource
	 * @param kind     the kind of change (ADDED, REMOVED or CHANGED)
	 */
	public ResourceDiff(IResource resource, int kind) {
		this(resource, kind, 0, null, null);
		Assert.isTrue(resource.getType() != IResource.FILE);
	}

	@Override
	public IFileRevision getBeforeState() {
		return before;
	}

	@Override
	public IFileRevision getAfterState() {
		return after;
	}

	@Override
	public IResource getResource() {
		return resource;
	}

	@Override
	public boolean equals(Object obj) {
		if (obj == this)
			return true;
		if (super.equals(obj)) {
			if (obj instanceof ResourceDiff) {
				ResourceDiff other = (ResourceDiff) obj;
				return getResource().equals(getResource())
					&& revisionsEqual(getBeforeState(), other.getBeforeState())
					&& revisionsEqual(getAfterState(), other.getAfterState());
			}
		}
		return false;
	}

	private boolean revisionsEqual(IFileRevision revision, IFileRevision revision2) {
		if (revision == null)
			return revision2 == null;
		if (revision2 == null)
			return false;
		return revision.equals(revision2);
	}

}