--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.base/share/classes/jdk/internal/module/ModulePath.java Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,791 @@
+/*
+ * Copyright (c) 2014, 2017, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation. Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package jdk.internal.module;
+
+import java.io.BufferedInputStream;
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.UncheckedIOException;
+import java.lang.module.FindException;
+import java.lang.module.InvalidModuleDescriptorException;
+import java.lang.module.ModuleDescriptor;
+import java.lang.module.ModuleDescriptor.Builder;
+import java.lang.module.ModuleFinder;
+import java.lang.module.ModuleReference;
+import java.net.URI;
+import java.nio.file.DirectoryStream;
+import java.nio.file.Files;
+import java.nio.file.NoSuchFileException;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.nio.file.attribute.BasicFileAttributes;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.Set;
+import java.util.jar.Attributes;
+import java.util.jar.JarEntry;
+import java.util.jar.JarFile;
+import java.util.jar.Manifest;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import java.util.stream.Collectors;
+import java.util.zip.ZipException;
+import java.util.zip.ZipFile;
+
+import jdk.internal.jmod.JmodFile;
+import jdk.internal.jmod.JmodFile.Section;
+import jdk.internal.perf.PerfCounter;
+import jdk.internal.util.jar.VersionedStream;
+
+
+/**
+ * A {@code ModuleFinder} that locates modules on the file system by searching
+ * a sequence of directories or packaged modules. The ModuleFinder can be
+ * created to work in either the run-time or link-time phases. In both cases it
+ * locates modular JAR and exploded modules. When created for link-time then it
+ * additionally locates modules in JMOD files. The ModuleFinder can also
+ * optionally patch any modules that it locates with a ModulePatcher.
+ */
+
+public class ModulePath implements ModuleFinder {
+ private static final String MODULE_INFO = "module-info.class";
+
+ // the version to use for multi-release modular JARs
+ private final Runtime.Version releaseVersion;
+
+ // true for the link phase (supports modules packaged in JMOD format)
+ private final boolean isLinkPhase;
+
+ // for patching modules, can be null
+ private final ModulePatcher patcher;
+
+ // the entries on this module path
+ private final Path[] entries;
+ private int next;
+
+ // map of module name to module reference map for modules already located
+ private final Map<String, ModuleReference> cachedModules = new HashMap<>();
+
+
+ private ModulePath(Runtime.Version version,
+ boolean isLinkPhase,
+ ModulePatcher patcher,
+ Path... entries) {
+ this.releaseVersion = version;
+ this.isLinkPhase = isLinkPhase;
+ this.patcher = patcher;
+ this.entries = entries.clone();
+ for (Path entry : this.entries) {
+ Objects.requireNonNull(entry);
+ }
+ }
+
+ /**
+ * Returns a ModuleFinder that that locates modules on the file system by
+ * searching a sequence of directories and/or packaged modules. The modules
+ * may be patched by the given ModulePatcher.
+ */
+ public static ModuleFinder of(ModulePatcher patcher, Path... entries) {
+ return new ModulePath(JarFile.runtimeVersion(), false, patcher, entries);
+ }
+
+ /**
+ * Returns a ModuleFinder that that locates modules on the file system by
+ * searching a sequence of directories and/or packaged modules.
+ */
+ public static ModuleFinder of(Path... entries) {
+ return of((ModulePatcher)null, entries);
+ }
+
+ /**
+ * Returns a ModuleFinder that that locates modules on the file system by
+ * searching a sequence of directories and/or packaged modules.
+ *
+ * @param version The release version to use for multi-release JAR files
+ * @param isLinkPhase {@code true} if the link phase to locate JMOD files
+ */
+ public static ModuleFinder of(Runtime.Version version,
+ boolean isLinkPhase,
+ Path... entries) {
+ return new ModulePath(version, isLinkPhase, null, entries);
+ }
+
+
+ @Override
+ public Optional<ModuleReference> find(String name) {
+ Objects.requireNonNull(name);
+
+ // try cached modules
+ ModuleReference m = cachedModules.get(name);
+ if (m != null)
+ return Optional.of(m);
+
+ // the module may not have been encountered yet
+ while (hasNextEntry()) {
+ scanNextEntry();
+ m = cachedModules.get(name);
+ if (m != null)
+ return Optional.of(m);
+ }
+ return Optional.empty();
+ }
+
+ @Override
+ public Set<ModuleReference> findAll() {
+ // need to ensure that all entries have been scanned
+ while (hasNextEntry()) {
+ scanNextEntry();
+ }
+ return cachedModules.values().stream().collect(Collectors.toSet());
+ }
+
+ /**
+ * Returns {@code true} if there are additional entries to scan
+ */
+ private boolean hasNextEntry() {
+ return next < entries.length;
+ }
+
+ /**
+ * Scans the next entry on the module path. A no-op if all entries have
+ * already been scanned.
+ *
+ * @throws FindException if an error occurs scanning the next entry
+ */
+ private void scanNextEntry() {
+ if (hasNextEntry()) {
+
+ long t0 = System.nanoTime();
+
+ Path entry = entries[next];
+ Map<String, ModuleReference> modules = scan(entry);
+ next++;
+
+ // update cache, ignoring duplicates
+ int initialSize = cachedModules.size();
+ for (Map.Entry<String, ModuleReference> e : modules.entrySet()) {
+ cachedModules.putIfAbsent(e.getKey(), e.getValue());
+ }
+
+ // update counters
+ int added = cachedModules.size() - initialSize;
+ moduleCount.add(added);
+
+ scanTime.addElapsedTimeFrom(t0);
+ }
+ }
+
+
+ /**
+ * Scan the given module path entry. If the entry is a directory then it is
+ * a directory of modules or an exploded module. If the entry is a regular
+ * file then it is assumed to be a packaged module.
+ *
+ * @throws FindException if an error occurs scanning the entry
+ */
+ private Map<String, ModuleReference> scan(Path entry) {
+
+ BasicFileAttributes attrs;
+ try {
+ attrs = Files.readAttributes(entry, BasicFileAttributes.class);
+ } catch (NoSuchFileException e) {
+ return Collections.emptyMap();
+ } catch (IOException ioe) {
+ throw new FindException(ioe);
+ }
+
+ try {
+
+ if (attrs.isDirectory()) {
+ Path mi = entry.resolve(MODULE_INFO);
+ if (!Files.exists(mi)) {
+ // assume a directory of modules
+ return scanDirectory(entry);
+ }
+ }
+
+ // packaged or exploded module
+ ModuleReference mref = readModule(entry, attrs);
+ if (mref != null) {
+ String name = mref.descriptor().name();
+ return Collections.singletonMap(name, mref);
+ }
+
+ // not recognized
+ String msg;
+ if (!isLinkPhase && entry.toString().endsWith(".jmod")) {
+ msg = "JMOD format not supported at execution time";
+ } else {
+ msg = "Module format not recognized";
+ }
+ throw new FindException(msg + ": " + entry);
+
+ } catch (IOException ioe) {
+ throw new FindException(ioe);
+ }
+ }
+
+
+ /**
+ * Scans the given directory for packaged or exploded modules.
+ *
+ * @return a map of module name to ModuleReference for the modules found
+ * in the directory
+ *
+ * @throws IOException if an I/O error occurs
+ * @throws FindException if an error occurs scanning the entry or the
+ * directory contains two or more modules with the same name
+ */
+ private Map<String, ModuleReference> scanDirectory(Path dir)
+ throws IOException
+ {
+ // The map of name -> mref of modules found in this directory.
+ Map<String, ModuleReference> nameToReference = new HashMap<>();
+
+ try (DirectoryStream<Path> stream = Files.newDirectoryStream(dir)) {
+ for (Path entry : stream) {
+ BasicFileAttributes attrs;
+ try {
+ attrs = Files.readAttributes(entry, BasicFileAttributes.class);
+ } catch (NoSuchFileException ignore) {
+ // file has been removed or moved, ignore for now
+ continue;
+ }
+
+ ModuleReference mref = readModule(entry, attrs);
+
+ // module found
+ if (mref != null) {
+ // can have at most one version of a module in the directory
+ String name = mref.descriptor().name();
+ ModuleReference previous = nameToReference.put(name, mref);
+ if (previous != null) {
+ String fn1 = fileName(mref);
+ String fn2 = fileName(previous);
+ throw new FindException("Two versions of module "
+ + name + " found in " + dir
+ + " (" + fn1 + " and " + fn2 + ")");
+ }
+ }
+ }
+ }
+
+ return nameToReference;
+ }
+
+
+ /**
+ * Reads a packaged or exploded module, returning a {@code ModuleReference}
+ * to the module. Returns {@code null} if the entry is not recognized.
+ *
+ * @throws IOException if an I/O error occurs
+ * @throws FindException if an error occurs parsing its module descriptor
+ */
+ private ModuleReference readModule(Path entry, BasicFileAttributes attrs)
+ throws IOException
+ {
+ try {
+
+ // exploded module
+ if (attrs.isDirectory()) {
+ return readExplodedModule(entry); // may return null
+ }
+
+ // JAR or JMOD file
+ if (attrs.isRegularFile()) {
+ String fn = entry.getFileName().toString();
+ boolean isDefaultFileSystem = isDefaultFileSystem(entry);
+
+ // JAR file
+ if (fn.endsWith(".jar")) {
+ if (isDefaultFileSystem) {
+ return readJar(entry);
+ } else {
+ // the JAR file is in a custom file system so
+ // need to copy it to the local file system
+ Path tmpdir = Files.createTempDirectory("mlib");
+ Path target = Files.copy(entry, tmpdir.resolve(fn));
+ return readJar(target);
+ }
+ }
+
+ // JMOD file
+ if (isDefaultFileSystem && isLinkPhase && fn.endsWith(".jmod")) {
+ return readJMod(entry);
+ }
+ }
+
+ return null;
+
+ } catch (InvalidModuleDescriptorException e) {
+ throw new FindException("Error reading module: " + entry, e);
+ }
+ }
+
+ /**
+ * Returns a string with the file name of the module if possible.
+ * If the module location is not a file URI then return the URI
+ * as a string.
+ */
+ private String fileName(ModuleReference mref) {
+ URI uri = mref.location().orElse(null);
+ if (uri != null) {
+ if (uri.getScheme().equalsIgnoreCase("file")) {
+ Path file = Paths.get(uri);
+ return file.getFileName().toString();
+ } else {
+ return uri.toString();
+ }
+ } else {
+ return "<unknown>";
+ }
+ }
+
+ // -- JMOD files --
+
+ private Set<String> jmodPackages(JmodFile jf) {
+ return jf.stream()
+ .filter(e -> e.section() == Section.CLASSES)
+ .map(JmodFile.Entry::name)
+ .map(this::toPackageName)
+ .flatMap(Optional::stream)
+ .collect(Collectors.toSet());
+ }
+
+ /**
+ * Returns a {@code ModuleReference} to a module in JMOD file on the
+ * file system.
+ *
+ * @throws IOException
+ * @throws InvalidModuleDescriptorException
+ */
+ private ModuleReference readJMod(Path file) throws IOException {
+ try (JmodFile jf = new JmodFile(file)) {
+ ModuleInfo.Attributes attrs;
+ try (InputStream in = jf.getInputStream(Section.CLASSES, MODULE_INFO)) {
+ attrs = ModuleInfo.read(in, () -> jmodPackages(jf));
+ }
+ return ModuleReferences.newJModModule(attrs, file);
+ }
+ }
+
+
+ // -- JAR files --
+
+ private static final String SERVICES_PREFIX = "META-INF/services/";
+
+ private static final Attributes.Name AUTOMATIC_MODULE_NAME
+ = new Attributes.Name("Automatic-Module-Name");
+
+ /**
+ * Returns the service type corresponding to the name of a services
+ * configuration file if it is a legal type name.
+ *
+ * For example, if called with "META-INF/services/p.S" then this method
+ * returns a container with the value "p.S".
+ */
+ private Optional<String> toServiceName(String cf) {
+ assert cf.startsWith(SERVICES_PREFIX);
+ int index = cf.lastIndexOf("/") + 1;
+ if (index < cf.length()) {
+ String prefix = cf.substring(0, index);
+ if (prefix.equals(SERVICES_PREFIX)) {
+ String sn = cf.substring(index);
+ if (Checks.isClassName(sn))
+ return Optional.of(sn);
+ }
+ }
+ return Optional.empty();
+ }
+
+ /**
+ * Reads the next line from the given reader and trims it of comments and
+ * leading/trailing white space.
+ *
+ * Returns null if the reader is at EOF.
+ */
+ private String nextLine(BufferedReader reader) throws IOException {
+ String ln = reader.readLine();
+ if (ln != null) {
+ int ci = ln.indexOf('#');
+ if (ci >= 0)
+ ln = ln.substring(0, ci);
+ ln = ln.trim();
+ }
+ return ln;
+ }
+
+ /**
+ * Treat the given JAR file as a module as follows:
+ *
+ * 1. The value of the Automatic-Module-Name attribute is the module name
+ * 2. The version, and the module name when the Automatic-Module-Name
+ * attribute is not present, is derived from the file ame of the JAR file
+ * 3. All packages are derived from the .class files in the JAR file
+ * 4. The contents of any META-INF/services configuration files are mapped
+ * to "provides" declarations
+ * 5. The Main-Class attribute in the main attributes of the JAR manifest
+ * is mapped to the module descriptor mainClass if possible
+ */
+ private ModuleDescriptor deriveModuleDescriptor(JarFile jf)
+ throws IOException
+ {
+ // Read Automatic-Module-Name attribute if present
+ Manifest man = jf.getManifest();
+ Attributes attrs = null;
+ String moduleName = null;
+ if (man != null) {
+ attrs = man.getMainAttributes();
+ if (attrs != null) {
+ moduleName = attrs.getValue(AUTOMATIC_MODULE_NAME);
+ }
+ }
+
+ // Derive the version, and the module name if needed, from JAR file name
+ String fn = jf.getName();
+ int i = fn.lastIndexOf(File.separator);
+ if (i != -1)
+ fn = fn.substring(i + 1);
+
+ // drop ".jar"
+ String name = fn.substring(0, fn.length() - 4);
+ String vs = null;
+
+ // find first occurrence of -${NUMBER}. or -${NUMBER}$
+ Matcher matcher = Patterns.DASH_VERSION.matcher(name);
+ if (matcher.find()) {
+ int start = matcher.start();
+
+ // attempt to parse the tail as a version string
+ try {
+ String tail = name.substring(start + 1);
+ ModuleDescriptor.Version.parse(tail);
+ vs = tail;
+ } catch (IllegalArgumentException ignore) { }
+
+ name = name.substring(0, start);
+ }
+
+ // Create builder, using the name derived from file name when
+ // Automatic-Module-Name not present
+ Builder builder;
+ if (moduleName != null) {
+ try {
+ builder = ModuleDescriptor.newAutomaticModule(moduleName);
+ } catch (IllegalArgumentException e) {
+ throw new FindException(AUTOMATIC_MODULE_NAME + ": " + e.getMessage());
+ }
+ } else {
+ builder = ModuleDescriptor.newAutomaticModule(cleanModuleName(name));
+ }
+
+ // module version if present
+ if (vs != null)
+ builder.version(vs);
+
+ // scan the names of the entries in the JAR file
+ Map<Boolean, Set<String>> map = VersionedStream.stream(jf)
+ .filter(e -> !e.isDirectory())
+ .map(JarEntry::getName)
+ .filter(e -> (e.endsWith(".class") ^ e.startsWith(SERVICES_PREFIX)))
+ .collect(Collectors.partitioningBy(e -> e.startsWith(SERVICES_PREFIX),
+ Collectors.toSet()));
+
+ Set<String> classFiles = map.get(Boolean.FALSE);
+ Set<String> configFiles = map.get(Boolean.TRUE);
+
+ // the packages containing class files
+ Set<String> packages = classFiles.stream()
+ .map(this::toPackageName)
+ .flatMap(Optional::stream)
+ .distinct()
+ .collect(Collectors.toSet());
+
+ // all packages are exported and open
+ builder.packages(packages);
+
+ // map names of service configuration files to service names
+ Set<String> serviceNames = configFiles.stream()
+ .map(this::toServiceName)
+ .flatMap(Optional::stream)
+ .collect(Collectors.toSet());
+
+ // parse each service configuration file
+ for (String sn : serviceNames) {
+ JarEntry entry = jf.getJarEntry(SERVICES_PREFIX + sn);
+ List<String> providerClasses = new ArrayList<>();
+ try (InputStream in = jf.getInputStream(entry)) {
+ BufferedReader reader
+ = new BufferedReader(new InputStreamReader(in, "UTF-8"));
+ String cn;
+ while ((cn = nextLine(reader)) != null) {
+ if (cn.length() > 0) {
+ String pn = packageName(cn);
+ if (!packages.contains(pn)) {
+ String msg = "Provider class " + cn + " not in module";
+ throw new InvalidModuleDescriptorException(msg);
+ }
+ providerClasses.add(cn);
+ }
+ }
+ }
+ if (!providerClasses.isEmpty())
+ builder.provides(sn, providerClasses);
+ }
+
+ // Main-Class attribute if it exists
+ if (attrs != null) {
+ String mainClass = attrs.getValue(Attributes.Name.MAIN_CLASS);
+ if (mainClass != null) {
+ mainClass = mainClass.replace("/", ".");
+ if (Checks.isClassName(mainClass)) {
+ String pn = packageName(mainClass);
+ if (packages.contains(pn)) {
+ builder.mainClass(mainClass);
+ }
+ }
+ }
+ }
+
+ return builder.build();
+ }
+
+ /**
+ * Patterns used to derive the module name from a JAR file name.
+ */
+ private static class Patterns {
+ static final Pattern DASH_VERSION = Pattern.compile("-(\\d+(\\.|$))");
+ static final Pattern NON_ALPHANUM = Pattern.compile("[^A-Za-z0-9]");
+ static final Pattern REPEATING_DOTS = Pattern.compile("(\\.)(\\1)+");
+ static final Pattern LEADING_DOTS = Pattern.compile("^\\.");
+ static final Pattern TRAILING_DOTS = Pattern.compile("\\.$");
+ }
+
+ /**
+ * Clean up candidate module name derived from a JAR file name.
+ */
+ private static String cleanModuleName(String mn) {
+ // replace non-alphanumeric
+ mn = Patterns.NON_ALPHANUM.matcher(mn).replaceAll(".");
+
+ // collapse repeating dots
+ mn = Patterns.REPEATING_DOTS.matcher(mn).replaceAll(".");
+
+ // drop leading dots
+ if (mn.length() > 0 && mn.charAt(0) == '.')
+ mn = Patterns.LEADING_DOTS.matcher(mn).replaceAll("");
+
+ // drop trailing dots
+ int len = mn.length();
+ if (len > 0 && mn.charAt(len-1) == '.')
+ mn = Patterns.TRAILING_DOTS.matcher(mn).replaceAll("");
+
+ return mn;
+ }
+
+ private Set<String> jarPackages(JarFile jf) {
+ return VersionedStream.stream(jf)
+ .filter(e -> !e.isDirectory())
+ .map(JarEntry::getName)
+ .map(this::toPackageName)
+ .flatMap(Optional::stream)
+ .collect(Collectors.toSet());
+ }
+
+ /**
+ * Returns a {@code ModuleReference} to a module in modular JAR file on
+ * the file system.
+ *
+ * @throws IOException
+ * @throws FindException
+ * @throws InvalidModuleDescriptorException
+ */
+ private ModuleReference readJar(Path file) throws IOException {
+ try (JarFile jf = new JarFile(file.toFile(),
+ true, // verify
+ ZipFile.OPEN_READ,
+ releaseVersion))
+ {
+ ModuleInfo.Attributes attrs;
+ JarEntry entry = jf.getJarEntry(MODULE_INFO);
+ if (entry == null) {
+
+ // no module-info.class so treat it as automatic module
+ try {
+ ModuleDescriptor md = deriveModuleDescriptor(jf);
+ attrs = new ModuleInfo.Attributes(md, null, null, null);
+ } catch (RuntimeException e) {
+ throw new FindException("Unable to derive module descriptor for "
+ + jf.getName(), e);
+ }
+
+ } else {
+ attrs = ModuleInfo.read(jf.getInputStream(entry),
+ () -> jarPackages(jf));
+ }
+
+ return ModuleReferences.newJarModule(attrs, patcher, file);
+ } catch (ZipException e) {
+ throw new FindException("Error reading " + file, e);
+ }
+ }
+
+
+ // -- exploded directories --
+
+ private Set<String> explodedPackages(Path dir) {
+ try {
+ return Files.find(dir, Integer.MAX_VALUE,
+ ((path, attrs) -> attrs.isRegularFile() && !isHidden(path)))
+ .map(path -> dir.relativize(path))
+ .map(this::toPackageName)
+ .flatMap(Optional::stream)
+ .collect(Collectors.toSet());
+ } catch (IOException x) {
+ throw new UncheckedIOException(x);
+ }
+ }
+
+ /**
+ * Returns a {@code ModuleReference} to an exploded module on the file
+ * system or {@code null} if {@code module-info.class} not found.
+ *
+ * @throws IOException
+ * @throws InvalidModuleDescriptorException
+ */
+ private ModuleReference readExplodedModule(Path dir) throws IOException {
+ Path mi = dir.resolve(MODULE_INFO);
+ ModuleInfo.Attributes attrs;
+ try (InputStream in = Files.newInputStream(mi)) {
+ attrs = ModuleInfo.read(new BufferedInputStream(in),
+ () -> explodedPackages(dir));
+ } catch (NoSuchFileException e) {
+ // for now
+ return null;
+ }
+ return ModuleReferences.newExplodedModule(attrs, patcher, dir);
+ }
+
+ /**
+ * Maps a type name to its package name.
+ */
+ private static String packageName(String cn) {
+ int index = cn.lastIndexOf('.');
+ return (index == -1) ? "" : cn.substring(0, index);
+ }
+
+ /**
+ * Maps the name of an entry in a JAR or ZIP file to a package name.
+ *
+ * @throws InvalidModuleDescriptorException if the name is a class file in
+ * the top-level directory of the JAR/ZIP file (and it's not
+ * module-info.class)
+ */
+ private Optional<String> toPackageName(String name) {
+ assert !name.endsWith("/");
+ int index = name.lastIndexOf("/");
+ if (index == -1) {
+ if (name.endsWith(".class") && !name.equals(MODULE_INFO)) {
+ String msg = name + " found in top-level directory"
+ + " (unnamed package not allowed in module)";
+ throw new InvalidModuleDescriptorException(msg);
+ }
+ return Optional.empty();
+ }
+
+ String pn = name.substring(0, index).replace('/', '.');
+ if (Checks.isPackageName(pn)) {
+ return Optional.of(pn);
+ } else {
+ // not a valid package name
+ return Optional.empty();
+ }
+ }
+
+ /**
+ * Maps the relative path of an entry in an exploded module to a package
+ * name.
+ *
+ * @throws InvalidModuleDescriptorException if the name is a class file in
+ * the top-level directory (and it's not module-info.class)
+ */
+ private Optional<String> toPackageName(Path file) {
+ assert file.getRoot() == null;
+
+ Path parent = file.getParent();
+ if (parent == null) {
+ String name = file.toString();
+ if (name.endsWith(".class") && !name.equals(MODULE_INFO)) {
+ String msg = name + " found in top-level directory"
+ + " (unnamed package not allowed in module)";
+ throw new InvalidModuleDescriptorException(msg);
+ }
+ return Optional.empty();
+ }
+
+ String pn = parent.toString().replace(File.separatorChar, '.');
+ if (Checks.isPackageName(pn)) {
+ return Optional.of(pn);
+ } else {
+ // not a valid package name
+ return Optional.empty();
+ }
+ }
+
+ /**
+ * Returns true if the given file exists and is a hidden file
+ */
+ private boolean isHidden(Path file) {
+ try {
+ return Files.isHidden(file);
+ } catch (IOException ioe) {
+ return false;
+ }
+ }
+
+
+ /**
+ * Return true if a path locates a path in the default file system
+ */
+ private boolean isDefaultFileSystem(Path path) {
+ return path.getFileSystem().provider()
+ .getScheme().equalsIgnoreCase("file");
+ }
+
+
+ private static final PerfCounter scanTime
+ = PerfCounter.newPerfCounter("jdk.module.finder.modulepath.scanTime");
+ private static final PerfCounter moduleCount
+ = PerfCounter.newPerfCounter("jdk.module.finder.modulepath.modules");
+}