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/*******************************************************************************
* Copyright (c) 2010-2012, Mark Czotter, 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;
import java.util.Set;
/**
* Generic interface for group of query specifications.
*
* <p>It handles more than one patterns as a group, and provides functionality to initialize the matchers together (which
* has performance benefits).
*
* @author Mark Czotter
*
*/
public interface IQueryGroup {
/**
* Initializes matchers for the group of patterns within an {@link ViatraQueryEngine}. If some of the pattern matchers are already
* constructed in the engine, no task is performed for them.
*
* <p>
* This preparation step has the advantage that it prepares pattern matchers for an arbitrary number of patterns in a
* single-pass traversal of the model.
* This is typically more efficient than traversing the model each time an individual pattern matcher is initialized on demand.
* The performance benefit only manifests itself if the engine is not in wildcard mode.
*
* @param engine
* the existing VIATRA Query engine in which the matchers will be created.
* @throws ViatraQueryRuntimeException
* if there was an error in preparing the engine
*/
public void prepare(ViatraQueryEngine engine);
/**
* Returns the currently assigned {@link IQuerySpecification}s.
*/
public Set<IQuerySpecification<?>> getSpecifications();
}
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