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/*******************************************************************************
* Copyright (c) 2010-2014, Miklos Foldenyi, Andras Szabolcs Nagy, Abel Hegedus, Akos Horvath, Zoltan Ujhelyi 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 org.eclipse.viatra.dse.objectives.impl;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
import org.eclipse.viatra.dse.api.DSEException;
import org.eclipse.viatra.dse.base.ThreadContext;
import org.eclipse.viatra.dse.objectives.IGlobalConstraint;
import org.eclipse.viatra.query.runtime.api.IPatternMatch;
import org.eclipse.viatra.query.runtime.api.IQuerySpecification;
import org.eclipse.viatra.query.runtime.api.ViatraQueryEngine;
import org.eclipse.viatra.query.runtime.api.ViatraQueryMatcher;
import org.eclipse.viatra.query.runtime.exception.ViatraQueryException;
/**
* This global constraint collects a list of VIATRA Query pattern and checks if any of them has a match on along a trajectory.
* If any of the patterns has a match then it is unsatisfied and the exploration should backtrack.
*
* @author Andras Szabolcs Nagy
*
*/
public class ModelQueriesGlobalConstraint implements IGlobalConstraint {
public static final String GLOBAL_CONSTRAINT = "GlobalConstraint";
protected String name;
protected List<IQuerySpecification<? extends ViatraQueryMatcher<? extends IPatternMatch>>> constraints;
protected List<ViatraQueryMatcher<? extends IPatternMatch>> matchers = new ArrayList<ViatraQueryMatcher<? extends IPatternMatch>>();
protected ModelQueryType type = ModelQueryType.NO_MATCH;
public ModelQueriesGlobalConstraint(String name,
List<IQuerySpecification<? extends ViatraQueryMatcher<? extends IPatternMatch>>> constraints) {
Objects.requireNonNull(name, "Name of the global constraint cannot be null.");
Objects.requireNonNull(constraints, "The list of constraints cannot be null.");
this.name = name;
this.constraints = constraints;
}
public ModelQueriesGlobalConstraint(
List<IQuerySpecification<? extends ViatraQueryMatcher<? extends IPatternMatch>>> constraints) {
this(GLOBAL_CONSTRAINT, constraints);
}
public ModelQueriesGlobalConstraint(String name) {
this(name, new ArrayList<IQuerySpecification<? extends ViatraQueryMatcher<? extends IPatternMatch>>>());
}
public ModelQueriesGlobalConstraint() {
this(GLOBAL_CONSTRAINT,
new ArrayList<IQuerySpecification<? extends ViatraQueryMatcher<? extends IPatternMatch>>>());
}
/**
* Adds a new VIATRA Query pattern.
*
* @param constraint
* A VIATRA Query pattern.
* @return The actual instance to enable builder pattern like usage.
*/
public ModelQueriesGlobalConstraint withConstraint(
IQuerySpecification<? extends ViatraQueryMatcher<? extends IPatternMatch>> constraint) {
constraints.add(constraint);
return this;
}
public ModelQueriesGlobalConstraint withType(ModelQueryType type) {
this.type = type;
return this;
}
@Override
public String getName() {
return name;
}
@Override
public boolean checkGlobalConstraint(ThreadContext context) {
for (ViatraQueryMatcher<? extends IPatternMatch> matcher : matchers) {
if ((type.equals(ModelQueryType.NO_MATCH) && matcher.countMatches() > 0)
|| (type.equals(ModelQueryType.MUST_HAVE_MATCH) && matcher.countMatches() == 0)) {
// System.out.println(type + " " + matcher.countMatches());
// System.out.println(matcher.getSpecification().getSimpleName());
return false;
}
}
return true;
}
@Override
public void init(ThreadContext context) {
try {
ViatraQueryEngine queryEngine = context.getQueryEngine();
for (IQuerySpecification<? extends ViatraQueryMatcher<? extends IPatternMatch>> querySpecification : constraints) {
ViatraQueryMatcher<? extends IPatternMatch> matcher = querySpecification.getMatcher(queryEngine);
matchers.add(matcher);
}
} catch (ViatraQueryException e) {
throw new DSEException("Couldn't get the VIATRA Query matcher, see inner exception", e);
}
}
@Override
public IGlobalConstraint createNew() {
return new ModelQueriesGlobalConstraint(name, constraints);
}
}
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