/**
* <copyright>
* Copyright (c) 2010-2014 Henshin developers. 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
* </copyright>
*/
package org.eclipse.emf.henshin.interpreter;
import java.util.List;
import org.eclipse.emf.ecore.EAttribute;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EReference;
/**
* Change model for Henshin. Stores information about changes and provides
* functionality to apply these changes to an {@link EGraph}.
*
* @see Engine#createChange(org.eclipse.emf.henshin.model.Rule, EGraph, Match, Match)
* @author Christian Krause
*/
public interface Change {
/**
* Change for creating or deleting an object.
*/
public interface ObjectChange extends Change {
EObject getObject();
boolean isCreate();
}
/**
* Change for modifying an attribute.
*/
public interface AttributeChange extends Change {
EObject getObject();
EAttribute getAttribute();
Object getOldValue();
Object getNewValue();
}
/**
* Change for creating or deleting a reference (link) between two objects.
*/
public interface ReferenceChange extends Change {
EObject getSource();
EObject getTarget();
EReference getReference();
boolean isCreate();
}
/**
* Change for modifying the index of a reference (link) between two objects.
*/
public interface IndexChange extends Change {
EObject getSource();
EObject getTarget();
EReference getReference();
int getOldIndex();
int getNewIndex();
}
/**
* Compound change (an ordered list of {@link Change}s).
*/
public interface CompoundChange extends Change {
List<Change> getChanges();
}
/**
* Get the {@link EGraph} to be changed.
* @return The {@link EGraph}.
*/
EGraph getEGraph();
/**
* Apply this change description and reverse it so that
* is can be undone / redone.
*/
void applyAndReverse();
}