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/*******************************************************************************
* Copyright (c) 2000, 2005 IBM Corporation 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:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.pde.core;
/**
* Model change events are fired by the model when it is changed from the last
* clean state. Model change listeners can use these events to update
* accordingly.
*
* @since 2.0
*/
public interface IModelChangedEvent {
/**
* Indicates a change where one or more objects are added to the model.
*/
int INSERT = 1;
/**
* Indicates a change where one or more objects are removed from the model.
*/
int REMOVE = 2;
/**
* Indicates that the model has been reloaded and that listeners should
* perform full refresh.
*/
int WORLD_CHANGED = 99;
/**
* indicates that a model object's property has been changed.
*/
int CHANGE = 3;
/**
* Returns the provider that fired this event.
*
* @return the event provider
*/
public IModelChangeProvider getChangeProvider();
/**
* Returns an array of model objects that are affected by the change.
*
* @return array of affected objects
*/
public Object[] getChangedObjects();
/**
* Returns a name of the object's property that has been changed if change
* type is CHANGE.
*
* @return property that has been changed in the model object, or <samp>null
* </samp> if type is not CHANGE or if more than one property has
* been changed.
*/
public String getChangedProperty();
/**
* When model change is of type <samp>CHANGE</samp>, this method is used to
* obtain the old value of the property (before the change).
*
* @return the old value of the changed property
*/
public Object getOldValue();
/**
* When model change is of type <samp>CHANGE</samp>, this method is used to
* obtain the new value of the property (after the change).
*
* @return the new value of the changed property.
*/
public Object getNewValue();
/**
* Returns the type of change that occured in the model (one of <samp>INSERT</samp>,
* <samp>REMOVE</samp>, <samp>CHANGE</samp> or
* <samp>WORLD_CHANGED </samp>).
*
* @return type of change
*/
public int getChangeType();
}
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