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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.matchers.psystem;
import tools.refinery.viatra.runtime.matchers.context.IQueryMetaContext;
import java.util.Collections;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.atomic.AtomicInteger;
/**
* @author Gabor Bergmann
*
*/
public abstract class BasePConstraint implements PConstraint {
protected PBody pBody;
private final Set<PVariable> affectedVariables;
private final int sequentialID = nextID.getAndIncrement();
// Use a static atomic integer to avoid race conditions when creating new constraints.
private static AtomicInteger nextID = new AtomicInteger(0);
public BasePConstraint(PBody pBody, Set<PVariable> affectedVariables) {
super();
this.pBody = pBody;
this.affectedVariables = new HashSet<PVariable>(affectedVariables);
for (PVariable pVariable : affectedVariables) {
pVariable.refer(this);
}
pBody.registerConstraint(this);
}
@Override
public String toString() {
return "PC[" + getClass().getSimpleName() + ":" + toStringRest() + "]";
}
protected abstract String toStringRest();
@Override
public Set<PVariable> getAffectedVariables() {
return affectedVariables;
}
@Override
public Map<Set<PVariable>, Set<PVariable>> getFunctionalDependencies(IQueryMetaContext context) {
return Collections.emptyMap();
}
@Override
public void replaceVariable(PVariable obsolete, PVariable replacement) {
pBody.checkMutability();
if (affectedVariables.remove(obsolete)) {
affectedVariables.add(replacement);
obsolete.unrefer(this);
replacement.refer(this);
doReplaceVariable(obsolete, replacement);
}
}
protected abstract void doReplaceVariable(PVariable obsolete, PVariable replacement);
@Override
public void delete() {
pBody.checkMutability();
for (PVariable pVariable : affectedVariables) {
pVariable.unrefer(this);
}
pBody.unregisterConstraint(this);
}
@Override
public void checkSanity() {
}
/**
* For backwards compatibility. Equivalent to {@link #getBody()}
*/
public PBody getPSystem() {
return pBody;
}
/**
* @since 2.1
*/
@Override
public PBody getBody() {
return pBody;
}
@Override
public int getMonotonousID() {
return sequentialID;
}
}
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