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/*******************************************************************************
* Copyright (c) 2010-2013, Abel Hegedus, Istvan Rath and Daniel Varro
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-v20.html.
*
* SPDX-License-Identifier: EPL-2.0
*******************************************************************************/
package tools.refinery.viatra.runtime.api;
/**
* Listener interface for model changes affecting different levels of the VIATRA Query architecture.
*
* @author Abel Hegedus
*
*/
public interface ViatraQueryModelUpdateListener {
/**
* Possible notification levels for changes
*
* @author Abel Hegedus
*
*/
enum ChangeLevel {
NO_CHANGE, MODEL, INDEX, MATCHSET;
public ChangeLevel changeOccured(ChangeLevel occuredLevel) {
if(this.compareTo(occuredLevel) < 0) {
return occuredLevel;
} else {
return this;
}
}
}
/**
* Called after each change with also sending the level of change.
* Only called if the change level is at least at the level returned by getLevel().
*
* @param changeLevel
*/
void notifyChanged(ChangeLevel changeLevel);
/**
* This may be queried only ONCE (!!!) at the registration of the listener.
*
* NOTE: this allows us to only create engine level change providers if there is someone who needs it.
*
* @return the change level where you want notifications
*/
ChangeLevel getLevel();
}
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