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/*******************************************************************************
* Copyright (c) 2010-2016, Grill Balázs, IncQueryLabs Ltd.
* 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.matcher.integration;
import tools.refinery.viatra.runtime.matchers.backend.QueryEvaluationHint;
import tools.refinery.viatra.runtime.matchers.backend.QueryEvaluationHint.BackendRequirement;
import tools.refinery.viatra.runtime.matchers.psystem.basicenumerables.PositivePatternCall;
import tools.refinery.viatra.runtime.matchers.psystem.rewriters.IFlattenCallPredicate;
/**
* This implementation forbids flattening of patterns marked to be executed with a caching / incremental backend.
* 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;
BackendRequirement backendRequirementType = evaluationHints.getQueryBackendRequirementType();
switch(backendRequirementType) {
case DEFAULT_CACHING:
return false;
case SPECIFIC:
return !evaluationHints.getQueryBackendFactory().isCaching();
case UNSPECIFIED:
case DEFAULT_SEARCH:
default:
return true;
}
}
}
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