private void listResources()

in java/main/src/main/java/com/epam/deltix/utilities/ResourceLoader.java [367:512]
117 lines of code
33 McCabe index (conditional complexity)

    private void listResources() throws URISyntaxException, IOException {
        _maxResourceLength = -1;
        _totalResourceLength = 0;
        _resources = new ArrayList<>();
        _resourcesRoot = "";

        final String dllExt;
        final VariablesMapper vm = getVariablesMapper();
        if (vm.isOsWindows())
            dllExt = ".dll";
        else if (vm.isOsLinux())
            dllExt = ".so";
        else if (vm.isOsDarwin())
            dllExt = ".dylib";
        else
            throw new RuntimeException("Can't determine dynamic library extension. Unsupported operations system: " + vm.getOs());

        // Based on the https://stackoverflow.com/questions/1429172/how-to-list-the-files-inside-a-jar-file/28057735
        final CodeSource src = _class.getProtectionDomain().getCodeSource();
        if (src == null)
            throw new RuntimeException("Can't get class '" + _class + "' code source.");
        final URL srcLocation = src.getLocation();

        final URL classResource = _class.getResource("");
        if (classResource == null)
            throw new RuntimeException("Can't get class '" + _class + "' resource.");

        String classLocation = classResource.toString();
        final String classPackageDir = _class.getPackage().getName().replace('.', '/') + '/';
        if (!classLocation.endsWith(classPackageDir))
            throw new RuntimeException("Can't determine source location for resource '" + classResource + "' of class '" + _class + "'.");
        classLocation = classLocation.substring(0, classLocation.length() - classPackageDir.length());

        log("Resources location: %s", srcLocation);

        final String srcScheme = new URI(classLocation).getScheme(); // srcLocation.toURI().getScheme();

        if (srcScheme.equalsIgnoreCase("jar")) {
            try (final ZipInputStream zip = new ZipInputStream(srcLocation.openStream())) {
                if (srcLocation.toURI().getScheme().equals("jar"))
                    _resourcesRoot = srcLocation.toString();

                ZipEntry zipEntry;
                while ((zipEntry = zip.getNextEntry()) != null) {
                    final String name = zipEntry.getName();
                    if (name.endsWith("/"))
                        continue;
                    addResource(name, zipEntry.getSize(), dllExt);
                }
            }

        } else if (srcScheme.equalsIgnoreCase("file")) {
            // https://stackoverflow.com/questions/3923129/get-a-list-of-resources-from-classpath-directory
            final String classPath = System.getProperty("java.class.path", ".");
            final String[] classPathElements = classPath.split(System.getProperty("path.separator"));

            for (final String classPathElement : classPathElements) {
                final Path classPathElementPath = Paths.get(classPathElement);

                if (classPathElementPath.toFile().isDirectory()) {
                    final Path resPath = classPathElementPath.toAbsolutePath();
                    final int resPathLength = resPath.toString().length() + 1; // Add last separator character

                    Files.walkFileTree(resPath, new SimpleFileVisitor<Path>() {
                        @Override
                        public FileVisitResult visitFile(final Path file, final BasicFileAttributes attrs) throws IOException {
                            final String resPath = file.toAbsolutePath().toString().substring(resPathLength);

                            addResource(resPath, Files.size(file), dllExt);

                            return FileVisitResult.CONTINUE;
                        }
                    });
                }

                else if (classPathElement.toLowerCase(Locale.ROOT).endsWith(".jar")) {
                    try (final ZipInputStream zip = new ZipInputStream(Files.newInputStream(classPathElementPath))) {
                        ZipEntry zipEntry;
                        while ((zipEntry = zip.getNextEntry()) != null) {
                            final String name = zipEntry.getName();
                            if (name.endsWith("/"))
                                continue;
                            addResource(name, zipEntry.getSize(), dllExt);
                        }
                    }
                }
            }

        } else {
            throw new RuntimeException("Unsupported URI scheme: " + srcScheme);
        }

        if (_resources.size() < 1)
            throw argException("No resource files were found at the specified path.");

        //Shorten destination path
        if (_compactDestinationPath) {
            final List<Path> commonPart = new ArrayList<>();
            {
                final Path resDstPath = _resources.get(0).destinationPathNullable;
                if (resDstPath != null) {
                    for (int pi = 0, pe = resDstPath.getNameCount(); pi < pe; ++pi)
                        commonPart.add(resDstPath.getName(pi));
                }
            }

            for (int ri = 1, re = _resources.size(); !commonPart.isEmpty() && ri < re; ++ri) {
                final Path resDstPath = _resources.get(ri).destinationPathNullable;
                if (resDstPath == null) {
                    commonPart.clear();
                    break;
                }

                final int resNameCount = resDstPath.getNameCount();
                while (resNameCount < commonPart.size())
                    commonPart.remove(commonPart.size() - 1);

                for (int pi = 0, pe = commonPart.size(); pi < pe; ++pi) {
                    if (!resDstPath.getName(pi).equals(commonPart.get(pi))) {
                        while (pi < commonPart.size())
                            commonPart.remove(commonPart.size() - 1);
                        break;
                    }
                }
            }

            if (!commonPart.isEmpty()) {
                final int removeParts = commonPart.size();
                for (final Resource res : _resources) {
                    final int resNameCount = res.destinationPathNullable.getNameCount();
                    res.destinationPathNullable = removeParts < resNameCount
                            ? res.destinationPathNullable.subpath(removeParts, resNameCount) : null;
                }
            }
        }


        if (logLevelLeast(DBG)) {
            // Show predefined deployment order
            // Will be later sorted before calling LoadLibrary
            Collections.sort(_resources);
            final Path fakeRoot = Paths.get("");
            for (final Resource resource : _resources)
                log("%s: %s", resource.order, resource.getFullPath(fakeRoot));
        }
    }