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/*
* SPDX-FileCopyrightText: 2024 The Refinery Authors <https://refinery.tools/>
*
* SPDX-License-Identifier: EPL-2.0
*/
package tools.refinery.language.scoping.imports;
import com.google.common.base.Splitter;
import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import org.apache.log4j.Logger;
import org.eclipse.emf.common.notify.Notification;
import org.eclipse.emf.common.notify.impl.AdapterImpl;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.resource.ResourceSet;
import org.eclipse.emf.ecore.util.EcoreUtil;
import org.eclipse.xtext.naming.QualifiedName;
import tools.refinery.language.library.RefineryLibrary;
import java.io.File;
import java.nio.file.Path;
import java.util.*;
public class ImportAdapter extends AdapterImpl {
private static final Logger LOG = Logger.getLogger(ImportAdapter.class);
private static final List<RefineryLibrary> DEFAULT_LIBRARIES;
private static final List<Path> DEFAULT_PATHS;
static {
var serviceLoader = ServiceLoader.load(RefineryLibrary.class);
var defaultLibraries = new ArrayList<RefineryLibrary>();
for (var service : serviceLoader) {
defaultLibraries.add(service);
}
DEFAULT_LIBRARIES = List.copyOf(defaultLibraries);
var pathEnv = System.getenv("REFINERY_LIBRARY_PATH");
if (pathEnv == null) {
DEFAULT_PATHS = List.of();
} else {
DEFAULT_PATHS = Splitter.on(File.pathSeparatorChar)
.splitToStream(pathEnv)
.map(pathString -> Path.of(pathString).toAbsolutePath().normalize())
.toList();
}
}
private final List<RefineryLibrary> libraries;
private final List<Path> libraryPaths;
private final Cache<QualifiedName, QualifiedName> failedResolutions =
CacheBuilder.newBuilder().maximumSize(100).build();
private final Map<QualifiedName, URI> qualifiedNameToUriMap = new LinkedHashMap<>();
private final Map<URI, QualifiedName> uriToQualifiedNameMap = new LinkedHashMap<>();
private ImportAdapter(ResourceSet resourceSet) {
libraries = new ArrayList<>(DEFAULT_LIBRARIES);
libraryPaths = new ArrayList<>(DEFAULT_PATHS);
for (var resource : resourceSet.getResources()) {
resourceAdded(resource);
}
}
@Override
public boolean isAdapterForType(Object type) {
return type == ImportAdapter.class;
}
public List<RefineryLibrary> getLibraries() {
return libraries;
}
public List<Path> getLibraryPaths() {
return libraryPaths;
}
public URI resolveQualifiedName(QualifiedName qualifiedName) {
var uri = getResolvedUri(qualifiedName);
if (uri != null) {
return uri;
}
if (isFailed(qualifiedName)) {
return null;
}
for (var library : libraries) {
var result = library.resolveQualifiedName(qualifiedName, libraryPaths);
if (result.isPresent()) {
uri = result.get();
markAsResolved(qualifiedName, uri);
return uri;
}
}
markAsUnresolved(qualifiedName);
return null;
}
private URI getResolvedUri(QualifiedName qualifiedName) {
return qualifiedNameToUriMap.get(qualifiedName);
}
private boolean isFailed(QualifiedName qualifiedName) {
return failedResolutions.getIfPresent(qualifiedName) != null;
}
private void markAsResolved(QualifiedName qualifiedName, URI uri) {
if (qualifiedNameToUriMap.put(qualifiedName, uri) != null) {
throw new IllegalArgumentException("Already resolved " + qualifiedName);
}
// We don't need to signal an error here, because modules with multiple qualified names will lead to
// validation errors later.
uriToQualifiedNameMap.putIfAbsent(uri, qualifiedName);
failedResolutions.invalidate(qualifiedName);
}
private void markAsUnresolved(QualifiedName qualifiedName) {
failedResolutions.put(qualifiedName, qualifiedName);
}
public QualifiedName getQualifiedName(URI uri) {
return uriToQualifiedNameMap.get(uri);
}
@Override
public void notifyChanged(Notification msg) {
switch (msg.getEventType()) {
case Notification.ADD -> {
if (msg.getNewValue() instanceof Resource resource) {
resourceAdded(resource);
}
}
case Notification.ADD_MANY -> {
if (msg.getNewValue() instanceof List<?> list) {
manyResourcesAdded(list);
}
}
case Notification.REMOVE -> {
if (msg.getOldValue() instanceof Resource resource) {
resourceRemoved(resource);
}
}
case Notification.REMOVE_MANY -> {
if (msg.getOldValue() instanceof List<?> list) {
manyResourcesRemoved(list);
}
}
default -> {
// Nothing to update.
}
}
}
private void manyResourcesAdded(List<?> list) {
for (var element : list) {
if (element instanceof Resource resource) {
resourceAdded(resource);
}
}
}
private void manyResourcesRemoved(List<?> list) {
for (var element : list) {
if (element instanceof Resource resource) {
resourceRemoved(resource);
}
}
}
private void resourceAdded(Resource resource) {
var uri = resource.getURI();
for (var library : libraries) {
var result = library.getQualifiedName(uri, libraryPaths);
if (result.isPresent()) {
var qualifiedName = result.get();
var previousQualifiedName = uriToQualifiedNameMap.putIfAbsent(uri, qualifiedName);
if (previousQualifiedName == null) {
if (qualifiedNameToUriMap.put(qualifiedName, uri) != null) {
throw new IllegalArgumentException("Duplicate resource for" + qualifiedName);
}
} else if (!previousQualifiedName.equals(qualifiedName)) {
LOG.warn("Expected %s to have qualified name %s, got %s instead".formatted(
uri, previousQualifiedName, qualifiedName));
}
}
}
}
private void resourceRemoved(Resource resource) {
var qualifiedName = uriToQualifiedNameMap.remove(resource.getURI());
if (qualifiedName != null) {
qualifiedNameToUriMap.remove(qualifiedName);
}
}
public static ImportAdapter getOrInstall(ResourceSet resourceSet) {
var adapter = getAdapter(resourceSet);
if (adapter == null) {
adapter = new ImportAdapter(resourceSet);
resourceSet.eAdapters().add(adapter);
}
return adapter;
}
private static ImportAdapter getAdapter(ResourceSet resourceSet) {
return (ImportAdapter) EcoreUtil.getAdapter(resourceSet.eAdapters(), ImportAdapter.class);
}
}
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