/*
* Copyright (c) 2012, 2014, 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 com.sun.tools.jdeps;
import static com.sun.tools.jdeps.Analyzer.Type.*;
import static com.sun.tools.jdeps.JdepsWriter.*;
import java.io.IOException;
import java.io.PrintWriter;
import java.lang.module.ResolutionException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.text.MessageFormat;
import java.util.*;
import java.util.jar.JarFile;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
import java.util.stream.Stream;
/**
* Implementation for the jdeps tool for static class dependency analysis.
*/
class JdepsTask {
static interface BadArguments {
String getKey();
Object[] getArgs();
boolean showUsage();
}
static class BadArgs extends Exception implements BadArguments {
static final long serialVersionUID = 8765093759964640721L;
BadArgs(String key, Object... args) {
super(JdepsTask.getMessage(key, args));
this.key = key;
this.args = args;
}
BadArgs showUsage(boolean b) {
showUsage = b;
return this;
}
final String key;
final Object[] args;
boolean showUsage;
@Override
public String getKey() {
return key;
}
@Override
public Object[] getArgs() {
return args;
}
@Override
public boolean showUsage() {
return showUsage;
}
}
static class UncheckedBadArgs extends RuntimeException implements BadArguments {
static final long serialVersionUID = -1L;
final BadArgs cause;
UncheckedBadArgs(BadArgs cause) {
super(cause);
this.cause = cause;
}
@Override
public String getKey() {
return cause.key;
}
@Override
public Object[] getArgs() {
return cause.args;
}
@Override
public boolean showUsage() {
return cause.showUsage;
}
}
static abstract class Option {
Option(boolean hasArg, String... aliases) {
this.hasArg = hasArg;
this.aliases = aliases;
}
boolean isHidden() {
return false;
}
boolean matches(String opt) {
for (String a : aliases) {
if (a.equals(opt))
return true;
if (hasArg && opt.startsWith(a + "="))
return true;
}
return false;
}
boolean ignoreRest() {
return false;
}
abstract void process(JdepsTask task, String opt, String arg) throws BadArgs;
final boolean hasArg;
final String[] aliases;
}
static abstract class HiddenOption extends Option {
HiddenOption(boolean hasArg, String... aliases) {
super(hasArg, aliases);
}
boolean isHidden() {
return true;
}
}
static Option[] recognizedOptions = {
new Option(false, "-h", "-?", "-help", "--help") {
void process(JdepsTask task, String opt, String arg) {
task.options.help = true;
}
},
new Option(true, "-dotoutput", "--dot-output") {
void process(JdepsTask task, String opt, String arg) throws BadArgs {
Path p = Paths.get(arg);
if (Files.exists(p) && (!Files.isDirectory(p) || !Files.isWritable(p))) {
throw new BadArgs("err.invalid.path", arg);
}
task.options.dotOutputDir = Paths.get(arg);;
}
},
new Option(false, "-s", "-summary") {
void process(JdepsTask task, String opt, String arg) {
task.options.showSummary = true;
task.options.verbose = SUMMARY;
}
},
new Option(false, "-v", "-verbose",
"-verbose:module",
"-verbose:package",
"-verbose:class") {
void process(JdepsTask task, String opt, String arg) throws BadArgs {
switch (opt) {
case "-v":
case "-verbose":
task.options.verbose = VERBOSE;
task.options.filterSameArchive = false;
task.options.filterSamePackage = false;
break;
case "-verbose:module":
task.options.verbose = MODULE;
break;
case "-verbose:package":
task.options.verbose = PACKAGE;
break;
case "-verbose:class":
task.options.verbose = CLASS;
break;
default:
throw new BadArgs("err.invalid.arg.for.option", opt);
}
}
},
new Option(false, "-apionly", "--api-only") {
void process(JdepsTask task, String opt, String arg) {
task.options.apiOnly = true;
}
},
new Option(true, "--check") {
void process(JdepsTask task, String opt, String arg) throws BadArgs {
Set<String> mods = Set.of(arg.split(","));
task.options.checkModuleDeps = mods;
task.options.addmods.addAll(mods);
}
},
new Option(true, "--generate-module-info") {
void process(JdepsTask task, String opt, String arg) throws BadArgs {
Path p = Paths.get(arg);
if (Files.exists(p) && (!Files.isDirectory(p) || !Files.isWritable(p))) {
throw new BadArgs("err.invalid.path", arg);
}
task.options.genModuleInfo = Paths.get(arg);
}
},
new Option(false, "-jdkinternals", "--jdk-internals") {
void process(JdepsTask task, String opt, String arg) {
task.options.findJDKInternals = true;
task.options.verbose = CLASS;
if (task.options.includePattern == null) {
task.options.includePattern = Pattern.compile(".*");
}
}
},
// ---- paths option ----
new Option(true, "-cp", "-classpath", "--class-path") {
void process(JdepsTask task, String opt, String arg) {
task.options.classpath = arg;
}
},
new Option(true, "--module-path") {
void process(JdepsTask task, String opt, String arg) throws BadArgs {
task.options.modulePath = arg;
}
},
new Option(true, "--upgrade-module-path") {
void process(JdepsTask task, String opt, String arg) throws BadArgs {
task.options.upgradeModulePath = arg;
}
},
new Option(true, "--system") {
void process(JdepsTask task, String opt, String arg) throws BadArgs {
if (arg.equals("none")) {
task.options.systemModulePath = null;
} else {
Path path = Paths.get(arg);
if (Files.isRegularFile(path.resolve("lib").resolve("modules")))
task.options.systemModulePath = arg;
else
throw new BadArgs("err.invalid.path", arg);
}
}
},
new Option(true, "--add-modules") {
void process(JdepsTask task, String opt, String arg) throws BadArgs {
Set<String> mods = Set.of(arg.split(","));
task.options.addmods.addAll(mods);
}
},
new Option(true, "-m", "--module") {
void process(JdepsTask task, String opt, String arg) throws BadArgs {
task.options.rootModule = arg;
task.options.addmods.add(arg);
}
},
new Option(true, "--multi-release") {
void process(JdepsTask task, String opt, String arg) throws BadArgs {
if (arg.equalsIgnoreCase("base")) {
task.options.multiRelease = JarFile.baseVersion();
} else {
try {
int v = Integer.parseInt(arg);
if (v < 9) {
throw new BadArgs("err.invalid.arg.for.option", arg);
}
} catch (NumberFormatException x) {
throw new BadArgs("err.invalid.arg.for.option", arg);
}
task.options.multiRelease = Runtime.Version.parse(arg);
}
}
},
// ---- Target filtering options ----
new Option(true, "-p", "-package", "--package") {
void process(JdepsTask task, String opt, String arg) {
task.options.packageNames.add(arg);
}
},
new Option(true, "-e", "-regex", "--regex") {
void process(JdepsTask task, String opt, String arg) {
task.options.regex = Pattern.compile(arg);
}
},
new Option(true, "--require") {
void process(JdepsTask task, String opt, String arg) {
task.options.requires.add(arg);
}
},
new Option(true, "-f", "-filter") {
void process(JdepsTask task, String opt, String arg) {
task.options.filterRegex = Pattern.compile(arg);
}
},
new Option(false, "-filter:package",
"-filter:archive", "-filter:module",
"-filter:none") {
void process(JdepsTask task, String opt, String arg) {
switch (opt) {
case "-filter:package":
task.options.filterSamePackage = true;
task.options.filterSameArchive = false;
break;
case "-filter:archive":
case "-filter:module":
task.options.filterSameArchive = true;
task.options.filterSamePackage = false;
break;
case "-filter:none":
task.options.filterSameArchive = false;
task.options.filterSamePackage = false;
break;
}
}
},
// ---- Source filtering options ----
new Option(true, "-include") {
void process(JdepsTask task, String opt, String arg) throws BadArgs {
task.options.includePattern = Pattern.compile(arg);
}
},
// Another alternative to list modules in --add-modules option
new HiddenOption(true, "--include-system-modules") {
void process(JdepsTask task, String opt, String arg) throws BadArgs {
task.options.includeSystemModulePattern = Pattern.compile(arg);
}
},
new Option(false, "-P", "-profile") {
void process(JdepsTask task, String opt, String arg) throws BadArgs {
task.options.showProfile = true;
}
},
new Option(false, "-R", "-recursive") {
void process(JdepsTask task, String opt, String arg) {
task.options.depth = 0;
// turn off filtering
task.options.filterSameArchive = false;
task.options.filterSamePackage = false;
}
},
new Option(false, "-I", "--inverse") {
void process(JdepsTask task, String opt, String arg) {
task.options.inverse = true;
// equivalent to the inverse of compile-time view analysis
task.options.compileTimeView = true;
task.options.filterSamePackage = true;
task.options.filterSameArchive = true;
}
},
new Option(false, "--compile-time") {
void process(JdepsTask task, String opt, String arg) {
task.options.compileTimeView = true;
task.options.filterSamePackage = true;
task.options.filterSameArchive = true;
task.options.depth = 0;
}
},
new Option(false, "-q", "-quiet") {
void process(JdepsTask task, String opt, String arg) {
task.options.nowarning = true;
}
},
new Option(false, "-version", "--version") {
void process(JdepsTask task, String opt, String arg) {
task.options.version = true;
}
},
new HiddenOption(false, "-fullversion") {
void process(JdepsTask task, String opt, String arg) {
task.options.fullVersion = true;
}
},
new HiddenOption(false, "-showlabel") {
void process(JdepsTask task, String opt, String arg) {
task.options.showLabel = true;
}
},
new HiddenOption(false, "--hide-show-module") {
void process(JdepsTask task, String opt, String arg) {
task.options.showModule = false;
}
},
new HiddenOption(true, "-depth") {
void process(JdepsTask task, String opt, String arg) throws BadArgs {
try {
task.options.depth = Integer.parseInt(arg);
} catch (NumberFormatException e) {
throw new BadArgs("err.invalid.arg.for.option", opt);
}
}
},
};
private static final String PROGNAME = "jdeps";
private final Options options = new Options();
private final List<String> inputArgs = new ArrayList<>();
private PrintWriter log;
void setLog(PrintWriter out) {
log = out;
}
/**
* Result codes.
*/
static final int EXIT_OK = 0, // Completed with no errors.
EXIT_ERROR = 1, // Completed but reported errors.
EXIT_CMDERR = 2, // Bad command-line arguments
EXIT_SYSERR = 3, // System error or resource exhaustion.
EXIT_ABNORMAL = 4; // terminated abnormally
int run(String... args) {
if (log == null) {
log = new PrintWriter(System.out);
}
try {
handleOptions(args);
if (options.help) {
showHelp();
}
if (options.version || options.fullVersion) {
showVersion(options.fullVersion);
}
if (!inputArgs.isEmpty() && options.rootModule != null) {
reportError("err.invalid.arg.for.option", "-m");
}
if (inputArgs.isEmpty() && options.addmods.isEmpty() && options.includePattern == null
&& options.includeSystemModulePattern == null && options.checkModuleDeps == null) {
if (options.help || options.version || options.fullVersion) {
return EXIT_OK;
} else {
showHelp();
return EXIT_CMDERR;
}
}
if (options.genModuleInfo != null) {
if (options.dotOutputDir != null || options.classpath != null || options.hasFilter()) {
showHelp();
return EXIT_CMDERR;
}
}
if (options.numFilters() > 1) {
reportError("err.invalid.filters");
return EXIT_CMDERR;
}
if (options.inverse && options.depth != 1) {
reportError("err.invalid.inverse.option", "-R");
return EXIT_CMDERR;
}
if (options.inverse && options.numFilters() == 0) {
reportError("err.invalid.filters");
return EXIT_CMDERR;
}
if ((options.findJDKInternals) && (options.hasFilter() || options.showSummary)) {
showHelp();
return EXIT_CMDERR;
}
if (options.showSummary && options.verbose != SUMMARY) {
showHelp();
return EXIT_CMDERR;
}
if (options.checkModuleDeps != null && !inputArgs.isEmpty()) {
reportError("err.invalid.module.option", inputArgs, "--check");
}
boolean ok = run();
return ok ? EXIT_OK : EXIT_ERROR;
} catch (BadArgs|UncheckedBadArgs e) {
reportError(e.getKey(), e.getArgs());
if (e.showUsage()) {
log.println(getMessage("main.usage.summary", PROGNAME));
}
return EXIT_CMDERR;
} catch (ResolutionException e) {
reportError("err.exception.message", e.getMessage());
return EXIT_CMDERR;
} catch (IOException e) {
e.printStackTrace();
return EXIT_CMDERR;
} catch (MultiReleaseException e) {
reportError(e.getKey(), (Object)e.getMsg());
return EXIT_CMDERR; // could be EXIT_ABNORMAL sometimes
} finally {
log.flush();
}
}
boolean run() throws IOException {
try (JdepsConfiguration config = buildConfig()) {
// detect split packages
config.splitPackages().entrySet().stream()
.sorted(Map.Entry.comparingByKey())
.forEach(e -> System.out.format("split package: %s %s%n", e.getKey(),
e.getValue().toString()));
// check if any module specified in -requires is missing
Stream.concat(options.addmods.stream(), options.requires.stream())
.filter(mn -> !config.isValidToken(mn))
.forEach(mn -> config.findModule(mn).orElseThrow(() ->
new UncheckedBadArgs(new BadArgs("err.module.not.found", mn))));
// --gen-module-info
if (options.genModuleInfo != null) {
return genModuleInfo(config);
}
// --check
if (options.checkModuleDeps != null) {
return new ModuleAnalyzer(config, log, options.checkModuleDeps).run();
}
if (options.dotOutputDir != null &&
(options.verbose == SUMMARY || options.verbose == MODULE) &&
!options.addmods.isEmpty() && inputArgs.isEmpty()) {
return new ModuleAnalyzer(config, log).genDotFiles(options.dotOutputDir);
}
if (options.inverse) {
return analyzeInverseDeps(config);
} else {
return analyzeDeps(config);
}
}
}
private JdepsConfiguration buildConfig() throws IOException {
JdepsConfiguration.Builder builder =
new JdepsConfiguration.Builder(options.systemModulePath);
builder.upgradeModulePath(options.upgradeModulePath)
.appModulePath(options.modulePath)
.addmods(options.addmods);
if (options.checkModuleDeps != null) {
// check all system modules in the image
builder.allModules();
}
if (options.classpath != null)
builder.addClassPath(options.classpath);
if (options.multiRelease != null)
builder.multiRelease(options.multiRelease);
// build the root set of archives to be analyzed
for (String s : inputArgs) {
Path p = Paths.get(s);
if (Files.exists(p)) {
builder.addRoot(p);
} else {
warning("warn.invalid.arg", s);
}
}
return builder.build();
}
private boolean analyzeDeps(JdepsConfiguration config) throws IOException {
// output result
final JdepsWriter writer;
if (options.dotOutputDir != null) {
writer = new DotFileWriter(options.dotOutputDir,
options.verbose,
options.showProfile,
options.showModule,
options.showLabel);
} else {
writer = new SimpleWriter(log,
options.verbose,
options.showProfile,
options.showModule);
}
// analyze the dependencies
DepsAnalyzer analyzer = new DepsAnalyzer(config,
dependencyFilter(config),
writer,
options.verbose,
options.apiOnly);
boolean ok = analyzer.run(options.compileTimeView, options.depth);
// print skipped entries, if any
analyzer.archives()
.forEach(archive -> archive.reader()
.skippedEntries().stream()
.forEach(name -> warning("warn.skipped.entry",
name, archive.getPathName())));
if (options.findJDKInternals && !options.nowarning) {
Map<String, String> jdkInternals = new TreeMap<>();
Set<String> deps = analyzer.dependences();
// find the ones with replacement
deps.forEach(cn -> replacementFor(cn).ifPresent(
repl -> jdkInternals.put(cn, repl))
);
if (!deps.isEmpty()) {
log.println();
warning("warn.replace.useJDKInternals", getMessage("jdeps.wiki.url"));
}
if (!jdkInternals.isEmpty()) {
log.println();
log.format("%-40s %s%n", "JDK Internal API", "Suggested Replacement");
log.format("%-40s %s%n", "----------------", "---------------------");
jdkInternals.entrySet().stream()
.forEach(e -> {
String key = e.getKey();
String[] lines = e.getValue().split("\\n");
for (String s : lines) {
log.format("%-40s %s%n", key, s);
key = "";
}
});
}
}
return ok;
}
private boolean analyzeInverseDeps(JdepsConfiguration config) throws IOException {
JdepsWriter writer = new SimpleWriter(log,
options.verbose,
options.showProfile,
options.showModule);
InverseDepsAnalyzer analyzer = new InverseDepsAnalyzer(config,
dependencyFilter(config),
writer,
options.verbose,
options.apiOnly);
boolean ok = analyzer.run();
log.println();
if (!options.requires.isEmpty())
log.format("Inverse transitive dependences on %s%n", options.requires);
else
log.format("Inverse transitive dependences matching %s%n",
options.regex != null
? options.regex.toString()
: "packages " + options.packageNames);
analyzer.inverseDependences().stream()
.sorted(Comparator.comparing(this::sortPath))
.forEach(path -> log.println(path.stream()
.map(Archive::getName)
.collect(Collectors.joining(" <- "))));
return ok;
}
private String sortPath(Deque<Archive> path) {
return path.peekFirst().getName();
}
private boolean genModuleInfo(JdepsConfiguration config) throws IOException {
ModuleInfoBuilder builder
= new ModuleInfoBuilder(config, inputArgs, options.genModuleInfo);
boolean ok = builder.run();
builder.modules().forEach(module -> {
if (module.packages().contains("")) {
reportError("ERROR: %s contains unnamed package. " +
"module-info.java not generated%n", module.getPathName());
}
});
if (!ok && !options.nowarning) {
log.println("ERROR: missing dependencies");
builder.visitMissingDeps(
new Analyzer.Visitor() {
@Override
public void visitDependence(String origin, Archive originArchive,
String target, Archive targetArchive) {
if (builder.notFound(targetArchive))
log.format(" %-50s -> %-50s %s%n",
origin, target, targetArchive.getName());
}
});
}
return ok;
}
/**
* Returns a filter used during dependency analysis
*/
private JdepsFilter dependencyFilter(JdepsConfiguration config) {
// Filter specified by -filter, -package, -regex, and -requires options
JdepsFilter.Builder builder = new JdepsFilter.Builder();
// source filters
builder.includePattern(options.includePattern);
builder.includeSystemModules(options.includeSystemModulePattern);
builder.filter(options.filterSamePackage, options.filterSameArchive);
builder.findJDKInternals(options.findJDKInternals);
// -requires
if (!options.requires.isEmpty()) {
options.requires.stream()
.forEach(mn -> {
Module m = config.findModule(mn).get();
builder.requires(mn, m.packages());
});
}
// -regex
if (options.regex != null)
builder.regex(options.regex);
// -package
if (!options.packageNames.isEmpty())
builder.packages(options.packageNames);
// -filter
if (options.filterRegex != null)
builder.filter(options.filterRegex);
// check if system module is set
config.rootModules().stream()
.map(Module::name)
.forEach(builder::includeIfSystemModule);
return builder.build();
}
public void handleOptions(String[] args) throws BadArgs {
// process options
for (int i=0; i < args.length; i++) {
if (args[i].charAt(0) == '-') {
String name = args[i];
Option option = getOption(name);
String param = null;
if (option.hasArg) {
if (name.startsWith("-") && name.indexOf('=') > 0) {
param = name.substring(name.indexOf('=') + 1, name.length());
} else if (i + 1 < args.length) {
param = args[++i];
}
if (param == null || param.isEmpty() || param.charAt(0) == '-') {
throw new BadArgs("err.missing.arg", name).showUsage(true);
}
}
option.process(this, name, param);
if (option.ignoreRest()) {
i = args.length;
}
} else {
// process rest of the input arguments
for (; i < args.length; i++) {
String name = args[i];
if (name.charAt(0) == '-') {
throw new BadArgs("err.option.after.class", name).showUsage(true);
}
inputArgs.add(name);
}
}
}
}
private Option getOption(String name) throws BadArgs {
for (Option o : recognizedOptions) {
if (o.matches(name)) {
return o;
}
}
throw new BadArgs("err.unknown.option", name).showUsage(true);
}
private void reportError(String key, Object... args) {
log.println(getMessage("error.prefix") + " " + getMessage(key, args));
}
void warning(String key, Object... args) {
log.println(getMessage("warn.prefix") + " " + getMessage(key, args));
}
private void showHelp() {
log.println(getMessage("main.usage", PROGNAME));
for (Option o : recognizedOptions) {
String name = o.aliases[0].substring(1); // there must always be at least one name
name = name.charAt(0) == '-' ? name.substring(1) : name;
if (o.isHidden() || name.equals("h") || name.startsWith("filter:")) {
continue;
}
log.println(getMessage("main.opt." + name));
}
}
private void showVersion(boolean full) {
log.println(version(full ? "full" : "release"));
}
private String version(String key) {
// key=version: mm.nn.oo[-milestone]
// key=full: mm.mm.oo[-milestone]-build
if (ResourceBundleHelper.versionRB == null) {
return System.getProperty("java.version");
}
try {
return ResourceBundleHelper.versionRB.getString(key);
} catch (MissingResourceException e) {
return getMessage("version.unknown", System.getProperty("java.version"));
}
}
static String getMessage(String key, Object... args) {
try {
return MessageFormat.format(ResourceBundleHelper.bundle.getString(key), args);
} catch (MissingResourceException e) {
throw new InternalError("Missing message: " + key);
}
}
private static class Options {
boolean help;
boolean version;
boolean fullVersion;
boolean showProfile;
boolean showModule = true;
boolean showSummary;
boolean apiOnly;
boolean showLabel;
boolean findJDKInternals;
boolean nowarning = false;
// default is to show package-level dependencies
// and filter references from same package
Analyzer.Type verbose = PACKAGE;
boolean filterSamePackage = true;
boolean filterSameArchive = false;
Pattern filterRegex;
Path dotOutputDir;
Path genModuleInfo;
String classpath;
int depth = 1;
Set<String> requires = new HashSet<>();
Set<String> packageNames = new HashSet<>();
Pattern regex; // apply to the dependences
Pattern includePattern;
Pattern includeSystemModulePattern;
boolean inverse = false;
boolean compileTimeView = false;
Set<String> checkModuleDeps;
String systemModulePath = System.getProperty("java.home");
String upgradeModulePath;
String modulePath;
String rootModule;
Set<String> addmods = new HashSet<>();
Runtime.Version multiRelease;
boolean hasFilter() {
return numFilters() > 0;
}
int numFilters() {
int count = 0;
if (requires.size() > 0) count++;
if (regex != null) count++;
if (packageNames.size() > 0) count++;
return count;
}
}
private static class ResourceBundleHelper {
static final ResourceBundle versionRB;
static final ResourceBundle bundle;
static final ResourceBundle jdkinternals;
static {
Locale locale = Locale.getDefault();
try {
bundle = ResourceBundle.getBundle("com.sun.tools.jdeps.resources.jdeps", locale);
} catch (MissingResourceException e) {
throw new InternalError("Cannot find jdeps resource bundle for locale " + locale);
}
try {
versionRB = ResourceBundle.getBundle("com.sun.tools.jdeps.resources.version");
} catch (MissingResourceException e) {
throw new InternalError("version.resource.missing");
}
try {
jdkinternals = ResourceBundle.getBundle("com.sun.tools.jdeps.resources.jdkinternals");
} catch (MissingResourceException e) {
throw new InternalError("Cannot find jdkinternals resource bundle");
}
}
}
/**
* Returns the recommended replacement API for the given classname;
* or return null if replacement API is not known.
*/
private Optional<String> replacementFor(String cn) {
String name = cn;
String value = null;
while (value == null && name != null) {
try {
value = ResourceBundleHelper.jdkinternals.getString(name);
} catch (MissingResourceException e) {
// go up one subpackage level
int i = name.lastIndexOf('.');
name = i > 0 ? name.substring(0, i) : null;
}
}
return Optional.ofNullable(value);
}
}