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/*
* SPDX-FileCopyrightText: 2024 The Refinery Authors <https://refinery.tools/>
*
* SPDX-License-Identifier: EPL-2.0
*/
package tools.refinery.language.library;
import org.eclipse.emf.common.util.URI;
import org.eclipse.xtext.naming.QualifiedName;
import java.nio.file.Path;
import java.util.*;
public abstract class ClasspathBasedLibrary implements RefineryLibrary {
private final Class<?> context;
private final QualifiedName prefix;
private final URI rootUri;
protected ClasspathBasedLibrary(Class<?> context, QualifiedName prefix) {
this.context = context == null ? getClass() : context;
this.prefix = prefix;
var contextPath = this.context.getCanonicalName().replace('.', '/') + ".class";
var contextResource = this.context.getClassLoader().getResource(contextPath);
if (contextResource == null) {
throw new IllegalStateException("Failed to find library context");
}
var contextUri = URI.createURI(contextResource.toString());
var segments = Arrays.copyOf(contextUri.segments(), contextUri.segmentCount() - 1);
rootUri = URI.createHierarchicalURI(contextUri.scheme(), contextUri.authority(), contextUri.device(),
segments, null, null);
}
protected ClasspathBasedLibrary(QualifiedName prefix) {
this(null, prefix);
}
@Override
public Optional<URI> resolveQualifiedName(QualifiedName qualifiedName, List<Path> libraryPaths) {
if (qualifiedName.startsWith(prefix)) {
return getLibraryUri(context, qualifiedName);
}
return Optional.empty();
}
@Override
public Optional<QualifiedName> getQualifiedName(URI uri, List<Path> libraryPaths) {
if (!uri.isHierarchical() ||
!Objects.equals(rootUri.scheme(), uri.scheme()) ||
!Objects.equals(rootUri.authority(), uri.authority()) ||
!Objects.equals(rootUri.device(), uri.device()) ||
rootUri.segmentCount() >= uri.segmentCount()) {
return Optional.empty();
}
int rootSegmentCount = rootUri.segmentCount();
int uriSegmentCount = uri.segmentCount();
if (!uri.segment(uriSegmentCount - 1).endsWith(RefineryLibrary.FILE_NAME_SUFFIX)) {
return Optional.empty();
}
var segments = new ArrayList<String>();
int i = 0;
while (i < rootSegmentCount) {
if (!rootUri.segment(i).equals(uri.segment(i))) {
return Optional.empty();
}
i++;
}
while (i < uriSegmentCount) {
var segment = uri.segment(i);
if (i == uriSegmentCount - 1) {
segment = segment.substring(0, segment.length() - RefineryLibrary.FILE_NAME_SUFFIX.length());
}
segments.add(segment);
i++;
}
var qualifiedName = QualifiedName.create(segments);
if (!qualifiedName.startsWith(prefix)) {
return Optional.empty();
}
return Optional.of(qualifiedName);
}
public static Optional<URI> getLibraryUri(Class<?> context, QualifiedName qualifiedName) {
var packagePath = context.getPackageName().replace('.', '/');
var libraryPath = String.join("/", qualifiedName.getSegments());
var resourceName = "%s/%s%s".formatted(packagePath, libraryPath, RefineryLibrary.FILE_NAME_SUFFIX);
var resource = context.getClassLoader().getResource(resourceName);
if (resource == null) {
return Optional.empty();
}
return Optional.of(URI.createURI(resource.toString()));
}
}
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