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/*
* SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
*
* SPDX-License-Identifier: EPL-2.0
*/
package tools.refinery.language.resource.state;
import com.google.inject.Inject;
import com.google.inject.Provider;
import com.google.inject.Singleton;
import com.google.inject.name.Named;
import org.eclipse.emf.common.notify.impl.AdapterImpl;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.util.EcoreUtil;
import org.eclipse.xtext.Constants;
import org.eclipse.xtext.resource.DerivedStateAwareResource;
import org.eclipse.xtext.resource.IDerivedStateComputer;
import org.eclipse.xtext.resource.XtextResource;
import tools.refinery.language.model.problem.*;
import tools.refinery.language.utils.ProblemUtil;
import java.util.*;
import java.util.function.Function;
@Singleton
public class ProblemDerivedStateComputer implements IDerivedStateComputer {
public static final String NEW_NODE = "new";
@Inject
@Named(Constants.LANGUAGE_NAME)
private String languageName;
@Inject
private Provider<NodeNameCollector> nodeNameCollectorProvider;
@Inject
private DerivedVariableComputer derivedVariableComputer;
@Override
public void installDerivedState(DerivedStateAwareResource resource, boolean preLinkingPhase) {
var problem = getProblem(resource);
if (problem != null) {
var adapter = getOrInstallAdapter(resource);
installDerivedProblemState(problem, adapter, preLinkingPhase);
}
}
protected Problem getProblem(Resource resource) {
List<EObject> contents = resource.getContents();
if (contents.isEmpty()) {
return null;
}
EObject object = contents.get(0);
if (object instanceof Problem problem) {
return problem;
}
return null;
}
protected void installDerivedProblemState(Problem problem, Adapter adapter, boolean preLinkingPhase) {
installDerivedClassDeclarationState(problem, adapter);
if (preLinkingPhase) {
return;
}
Set<String> nodeNames = installDerivedNodes(problem);
derivedVariableComputer.installDerivedVariables(problem, nodeNames);
}
protected void installDerivedClassDeclarationState(Problem problem, Adapter adapter) {
for (var statement : problem.getStatements()) {
if (statement instanceof ClassDeclaration classDeclaration) {
installOrRemoveNewNode(adapter, classDeclaration);
for (var featureDeclaration : classDeclaration.getFeatureDeclarations()) {
if (featureDeclaration instanceof ReferenceDeclaration referenceDeclaration) {
installOrRemoveInvalidMultiplicityPredicate(adapter, classDeclaration, referenceDeclaration);
}
}
}
}
}
protected void installOrRemoveNewNode(Adapter adapter, ClassDeclaration declaration) {
if (declaration.isAbstract()) {
var newNode = declaration.getNewNode();
if (newNode != null) {
declaration.setNewNode(null);
adapter.removeNewNode(declaration);
}
} else {
if (declaration.getNewNode() == null) {
var newNode = adapter.createNewNodeIfAbsent(declaration, key -> createNode(NEW_NODE));
declaration.setNewNode(newNode);
}
}
}
protected void installOrRemoveInvalidMultiplicityPredicate(
Adapter adapter, ClassDeclaration containingClassDeclaration, ReferenceDeclaration declaration) {
if (ProblemUtil.hasMultiplicityConstraint(declaration)) {
if (declaration.getInvalidMultiplicity() == null) {
var invalidMultiplicity = adapter.createInvalidMultiplicityPredicateIfAbsent(declaration, key -> {
var predicate = ProblemFactory.eINSTANCE.createPredicateDefinition();
predicate.setError(true);
predicate.setName("invalidMultiplicity");
var parameter = ProblemFactory.eINSTANCE.createParameter();
parameter.setParameterType(containingClassDeclaration);
parameter.setName("node");
predicate.getParameters().add(parameter);
return predicate;
});
declaration.setInvalidMultiplicity(invalidMultiplicity);
}
} else {
var invalidMultiplicity = declaration.getInvalidMultiplicity();
if (invalidMultiplicity != null) {
declaration.setInvalidMultiplicity(null);
adapter.removeInvalidMultiplicityPredicate(declaration);
}
}
}
protected Set<String> installDerivedNodes(Problem problem) {
var collector = nodeNameCollectorProvider.get();
collector.collectNodeNames(problem);
Set<String> nodeNames = collector.getNodeNames();
List<Node> graphNodes = problem.getNodes();
for (String nodeName : nodeNames) {
var graphNode = createNode(nodeName);
graphNodes.add(graphNode);
}
return nodeNames;
}
protected Node createNode(String name) {
var node = ProblemFactory.eINSTANCE.createNode();
node.setName(name);
return node;
}
@Override
public void discardDerivedState(DerivedStateAwareResource resource) {
var problem = getProblem(resource);
if (problem != null) {
var adapter = getOrInstallAdapter(resource);
discardDerivedProblemState(problem, adapter);
}
}
protected void discardDerivedProblemState(Problem problem, Adapter adapter) {
var abstractClassDeclarations = new HashSet<ClassDeclaration>();
var referenceDeclarationsWithMultiplicity = new HashSet<ReferenceDeclaration>();
problem.getNodes().clear();
for (var statement : problem.getStatements()) {
if (statement instanceof ClassDeclaration classDeclaration) {
classDeclaration.setNewNode(null);
if (classDeclaration.isAbstract()) {
abstractClassDeclarations.add(classDeclaration);
}
for (var featureDeclaration : classDeclaration.getFeatureDeclarations()) {
if (featureDeclaration instanceof ReferenceDeclaration referenceDeclaration &&
ProblemUtil.hasMultiplicityConstraint(referenceDeclaration)) {
referenceDeclarationsWithMultiplicity.add(referenceDeclaration);
}
}
}
}
adapter.retainAll(abstractClassDeclarations, referenceDeclarationsWithMultiplicity);
derivedVariableComputer.discardDerivedVariables(problem);
}
protected Adapter getOrInstallAdapter(Resource resource) {
if (!(resource instanceof XtextResource)) {
return new Adapter();
}
String resourceLanguageName = ((XtextResource) resource).getLanguageName();
if (!languageName.equals(resourceLanguageName)) {
return new Adapter();
}
var adapter = (Adapter) EcoreUtil.getAdapter(resource.eAdapters(), Adapter.class);
if (adapter == null) {
adapter = new Adapter();
resource.eAdapters().add(adapter);
}
return adapter;
}
protected static class Adapter extends AdapterImpl {
private final Map<ClassDeclaration, Node> newNodes = new HashMap<>();
private final Map<ReferenceDeclaration, PredicateDefinition> invalidMultiplicityPredicates = new HashMap<>();
public Node createNewNodeIfAbsent(ClassDeclaration classDeclaration,
Function<ClassDeclaration, Node> createNode) {
return newNodes.computeIfAbsent(classDeclaration, createNode);
}
public void removeNewNode(ClassDeclaration classDeclaration) {
newNodes.remove(classDeclaration);
}
public PredicateDefinition createInvalidMultiplicityPredicateIfAbsent(
ReferenceDeclaration referenceDeclaration,
Function<ReferenceDeclaration, PredicateDefinition> createPredicate) {
return invalidMultiplicityPredicates.computeIfAbsent(referenceDeclaration, createPredicate);
}
public void removeInvalidMultiplicityPredicate(ReferenceDeclaration referenceDeclaration) {
invalidMultiplicityPredicates.remove(referenceDeclaration);
}
public void retainAll(Collection<ClassDeclaration> abstractClassDeclarations,
Collection<ReferenceDeclaration> referenceDeclarationsWithMultiplicity) {
newNodes.keySet().retainAll(abstractClassDeclarations);
invalidMultiplicityPredicates.keySet().retainAll(referenceDeclarationsWithMultiplicity);
}
@Override
public boolean isAdapterForType(Object type) {
return Adapter.class == type;
}
}
}
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