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package org.javacs;
import java.io.File;
import java.io.IOException;
import java.nio.charset.Charset;
import java.nio.file.Path;
import java.util.*;
import java.util.logging.Logger;
import javax.tools.*;
class SourceFileManager extends ForwardingJavaFileManager<StandardJavaFileManager> {
public SourceFileManager() {
super(createDelegateFileManager());
}
private static StandardJavaFileManager createDelegateFileManager() {
var compiler = ServiceLoader.load(JavaCompiler.class).iterator().next();
return compiler.getStandardFileManager(SourceFileManager::logError, null, Charset.defaultCharset());
}
private static void logError(Diagnostic<?> error) {
LOG.warning(error.getMessage(null));
}
private final LruCache<String, Iterable<JavaFileObject>> cacheClassPath = new LruCache<>(1000, this::listClassPath);
@Override
public Iterable<JavaFileObject> list(
Location location, String packageName, Set<JavaFileObject.Kind> kinds, boolean recurse) throws IOException {
if (location == StandardLocation.SOURCE_PATH) {
var stream = FileStore.list(packageName).stream().map(this::asJavaFileObject);
return stream::iterator;
} else if (location == StandardLocation.CLASS_PATH) {
// Listing large class paths is expensive
return cacheClassPath.get(packageName);
} else {
return super.list(location, packageName, kinds, recurse);
}
}
private Iterable<JavaFileObject> listClassPath(String packageName) {
try {
return super.list(StandardLocation.CLASS_PATH, packageName, Set.of(JavaFileObject.Kind.values()), false);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
private JavaFileObject asJavaFileObject(Path file) {
return new SourceFileObject(file);
}
@Override
public String inferBinaryName(Location location, JavaFileObject file) {
if (location == StandardLocation.SOURCE_PATH) {
var source = (SourceFileObject) file;
var packageName = FileStore.packageName(source.path);
var className = removeExtension(source.path.getFileName().toString());
if (!packageName.isEmpty()) className = packageName + "." + className;
return className;
} else {
return super.inferBinaryName(location, file);
}
}
private String removeExtension(String fileName) {
var lastDot = fileName.lastIndexOf(".");
return (lastDot == -1 ? fileName : fileName.substring(0, lastDot));
}
@Override
public boolean isSameFile(FileObject a, FileObject b) {
return a.equals(b);
}
@Override
public boolean hasLocation(Location location) {
return location == StandardLocation.SOURCE_PATH || super.hasLocation(location);
}
@Override
public JavaFileObject getJavaFileForInput(Location location, String className, JavaFileObject.Kind kind)
throws IOException {
if (location == StandardLocation.SOURCE_PATH) {
var packageName = Parser.mostName(className);
var simpleClassName = Parser.lastName(className);
for (var f : FileStore.list(packageName)) {
if (f.getFileName().toString().equals(simpleClassName + kind.extension)) return new SourceFileObject(f);
}
return null;
}
return super.getJavaFileForInput(location, className, kind);
}
@Override
public FileObject getFileForInput(Location location, String packageName, String relativeName) throws IOException {
if (location == StandardLocation.SOURCE_PATH) {
return null;
}
return super.getFileForInput(location, packageName, relativeName);
}
@Override
public boolean contains(Location location, FileObject file) throws IOException {
if (location == StandardLocation.SOURCE_PATH) {
var source = (SourceFileObject) file;
return FileStore.contains(source.path);
} else {
return super.contains(location, file);
}
}
public Iterable<? extends JavaFileObject> getJavaFileObjectsFromFiles(Iterable<? extends File> files) {
var result = new ArrayList<JavaFileObject>();
for (var f : files) {
result.add(new SourceFileObject(f.toPath()));
}
return result;
}
public void setLocation(Location location, Iterable<? extends File> files) throws IOException {
fileManager.setLocation(location, files);
}
public void setLocationFromPaths(Location location, Collection<? extends Path> searchpath) throws IOException {
fileManager.setLocationFromPaths(location, searchpath);
}
private static final Logger LOG = Logger.getLogger("main");
}
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