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/*******************************************************************************
* Copyright (c) 2004-2010 Gabor Bergmann 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 tools.refinery.viatra.runtime.api.impl.BaseMatcher;
import tools.refinery.viatra.runtime.matchers.tuple.Tuple;
/**
* This is a generic pattern matcher for any VIATRA pattern, with "interpretative" query execution.
* To use the pattern matcher on a given model, obtain a {@link GenericQuerySpecification} first, then
* invoke e.g. {@link GenericQuerySpecification#getMatcher(ViatraQueryEngine)}.
* in conjunction with {@link ViatraQueryEngine#on(tools.refinery.viatra.runtime.api.scope.QueryScope)}.
* <p>
* Whenever available, consider using the pattern-specific generated matcher API instead.
*
* <p>
* Matches of the pattern will be represented as {@link GenericPatternMatch}.
*
* @author Bergmann Gábor
* @see GenericPatternMatch
* @see GenericMatchProcessor
* @see GenericQuerySpecification
* @since 0.9
*/
public class GenericPatternMatcher extends BaseMatcher<GenericPatternMatch> {
/**
* @since 1.4
*/
public GenericPatternMatcher(GenericQuerySpecification<? extends GenericPatternMatcher> specification) {
super(specification);
}
@Override
public GenericPatternMatch arrayToMatch(Object[] parameters) {
return GenericPatternMatch.newMatch(getSpecification(), parameters);
}
@Override
public GenericPatternMatch arrayToMatchMutable(Object[] parameters) {
return GenericPatternMatch.newMutableMatch(getSpecification(), parameters);
}
@Override
protected GenericPatternMatch tupleToMatch(Tuple t) {
return new GenericPatternMatch.Immutable(getSpecification(), /*avoid re-cloning*/t.getElements());
}
@SuppressWarnings("unchecked")
@Override
public GenericQuerySpecification<? extends GenericPatternMatcher> getSpecification() {
return (GenericQuerySpecification<? extends GenericPatternMatcher>)querySpecification;
}
/**
* Internal method for {@link GenericQuerySpecification}
* @noreference
*/
static <Matcher extends GenericPatternMatcher> GenericPatternMatcher instantiate(GenericQuerySpecification<Matcher> querySpecification) {
return new GenericPatternMatcher(querySpecification);
}
/**
* Internal method for {@link GenericQuerySpecification}
* @noreference
*/
static <Matcher extends GenericPatternMatcher> GenericPatternMatcher instantiate(ViatraQueryEngine engine, GenericQuerySpecification<Matcher> querySpecification) {
// check if matcher already exists
GenericPatternMatcher matcher = engine.getExistingMatcher(querySpecification);
if (matcher == null) {
matcher = engine.getMatcher(querySpecification);
}
return matcher;
}
}
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