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/*******************************************************************************
* Copyright (c) 2010-2013, Zoltan Ujhelyi, 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.localsearch.operations;
import tools.refinery.viatra.runtime.localsearch.MatchingFrame;
import tools.refinery.viatra.runtime.localsearch.matcher.ISearchContext;
import tools.refinery.viatra.runtime.localsearch.operations.ISearchOperation.ISearchOperationExecutor;
/**
* Abstract base class for search operations that check only the already set variables.
*
* @noextend This class is not intended to be subclassed by clients.
* @since 2.0
*/
public abstract class CheckOperationExecutor implements ISearchOperationExecutor {
/**
* The executed field ensures that the second call of the check always returns false, resulting in a quick
* backtracking.
*/
private boolean executed;
@Override
public void onInitialize(MatchingFrame frame, ISearchContext context) {
executed = false;
}
@Override
public void onBacktrack(MatchingFrame frame, ISearchContext context) {
}
@Override
public boolean execute(MatchingFrame frame, ISearchContext context) {
executed = executed ? false : check(frame, context);
return executed;
}
/**
* Executes the checking operation
* @since 1.7
*/
protected abstract boolean check(MatchingFrame frame, ISearchContext context) ;
}
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