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/*******************************************************************************
* Copyright (c) 2010-2016, Grill Balázs, IncQueryLabs Ltd.
* 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:
* Grill Balázs - initial API and implementation
*******************************************************************************/
package org.eclipse.viatra.query.runtime.localsearch.matcher.integration;
import org.eclipse.viatra.query.runtime.matchers.backend.IQueryBackendFactory;
import org.eclipse.viatra.query.runtime.matchers.backend.QueryEvaluationHint;
import org.eclipse.viatra.query.runtime.matchers.psystem.basicenumerables.PositivePatternCall;
import org.eclipse.viatra.query.runtime.matchers.psystem.rewriters.IFlattenCallPredicate;
/**
* This implementation forbids flattening of patterns marked to be executed with a backend other than the
* Local search engine (e.g. Rete). This makes is possible for the user to configure hybrid matching via using
* the 'search' and 'incremental keywords in the pattern definition file.
*
* @since 1.5
*
*/
public class DontFlattenIncrementalPredicate implements IFlattenCallPredicate {
@Override
public boolean shouldFlatten(PositivePatternCall positivePatternCall) {
QueryEvaluationHint evaluationHints = positivePatternCall.getReferredQuery().getEvaluationHints();
if (evaluationHints == null) return true;
IQueryBackendFactory configuredBackend = evaluationHints.getQueryBackendFactory();
return configuredBackend == null || !configuredBackend.isCaching();
}
}
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