Examples of java.nio.file.FileSystem

java.nio.file.FileSystem
Provides an interface to a file system and is the factory for objects to access files and other objects in the file system.
The default file system, obtained by invoking the {@link FileSystems#getDefault FileSystems.getDefault} method, provides access to the file system that isaccessible to the Java virtual machine. The {@link FileSystems} class definesmethods to create file systems that provide access to other types of (custom) file systems.
A file system is the factory for several types of objects:
- The {@link #getPath getPath} method converts a system dependentpath string, returning a {@link Path} object that may be usedto locate and access a file.
- The {@link #getPathMatcher getPathMatcher} method is usedto create a {@link PathMatcher} that performs match operations onpaths.
- The {@link #getFileStores getFileStores} method returns an iteratorover the underlying {@link FileStore file-stores}.
- The {@link #getUserPrincipalLookupService getUserPrincipalLookupService}method returns the {@link UserPrincipalLookupService} to lookup users orgroups by name.
- The {@link #newWatchService newWatchService} method creates a{@link WatchService} that may be used to watch objects for changes andevents.
File systems vary greatly. In some cases the file system is a single hierarchy of files with one top-level root directory. In other cases it may have several distinct file hierarchies, each with its own top-level root directory. The {@link #getRootDirectories getRootDirectories} method may beused to iterate over the root directories in the file system. A file system is typically composed of one or more underlying {@link FileStore file-stores}that provide the storage for the files. Theses file stores can also vary in the features they support, and the file attributes or meta-data that they associate with files.
A file system is open upon creation and can be closed by invoking its {@link #close() close} method. Once closed, any further attempt to accessobjects in the file system cause {@link ClosedFileSystemException} to bethrown. File systems created by the default {@link FileSystemProvider provider}cannot be closed.
A {@code FileSystem} can provide read-only or read-write access to thefile system. Whether or not a file system provides read-only access is established when the {@code FileSystem} is created and can be tested by invokingits {@link #isReadOnly() isReadOnly} method. Attempts to write to file storesby means of an object associated with a read-only file system throws {@link ReadOnlyFileSystemException}.
File systems are safe for use by multiple concurrent threads. The {@link #close close} method may be invoked at any time to close a file system butwhether a file system is asynchronously closeable is provider specific and therefore unspecified. In other words, if a thread is accessing an object in a file system, and another thread invokes the {@code close} methodthen it may require to block until the first operation is complete. Closing a file system causes all open channels, watch services, and other {@link Closeable closeable} objects associated with the file system to be closed. @since 1.7

    @Specialization
    @SlowPath
    protected Object libPathsVec(RAbstractStringVector pathVec) {
        controlVisibility();
        ArrayList<String> resultsList = new ArrayList<>(pathVec.getLength());
        FileSystem fileSystem = FileSystems.getDefault();
        for (int i = 0; i < resultsList.size(); i++) {
            String path = Utils.tildeExpand(pathVec.getDataAt(i));
            try {
                resultsList.add(fileSystem.getPath(path).toRealPath().toString());
            } catch (IOException e) {
                // directory does not exist (or is inaccessible - same thing),
                // just ignore it
            }
        }

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        return com.google.common.io.Files.hash(file, Hashing.md5()).toString();
    }


    private SourceHash parse(String str) {
        Iterator<String> parts = Splitter.on("**").split(str).iterator();
        FileSystem fileSystem = FileSystems.getDefault();
        return new SourceHash(
                SourcePath.valueOf(fileSystem.getPath(parts.next()),
                               fileSystem.getPath(parts.next())),
                parts.next(),
                Long.parseLong(parts.next())
        );
    }

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            }
        }
        
        if(bean.getHelp())
            usage(clp);
        FileSystem fSystem = FileSystems.getDefault();
        boolean specParsed = false;
        ASTSpecWalker walker = new ASTSpecWalker();
        if(bean.printSchema()){
            String inputFile = bean.getSpecInputFile();
            
            try {
                if(clangAST.Driver.parseSpecFile(inputFile) != 0)
                        System.exit(1);
            } catch (IOException ex) {
                System.err.println(ex.getMessage());
                System.exit(1);
            }
            
            String outputFile = table.getClangSpecName() + ".logic";
            Path outputPath = fSystem.getPath(outputFile);
            
            try (BufferedWriter writer = Files.newBufferedWriter(outputPath, StandardCharsets.UTF_8);){
                
                walker.walk(new PrintLogicQLSchema(writer));
                specParsed = true;
            }
            catch(IOException ex){
                System.err.println(ex.getMessage());
                System.exit(1);
            }
        }
        
        if(bean.createPlugin()){
            try {
                if(!specParsed){
                    if(clangAST.Driver.parseSpecAndAuxFile(bean.getSpecInputFile(), bean.getAuxInputFile()) != 0)
                        System.exit(1);
                }
                else {
                    if(clangAST.Driver.parseAuxFile(bean.getAuxInputFile()) != 0)
                        System.exit(1);
                }
                
                String outputFilename = table.getClangSpecName() + ".h";
                Path outputFile = fSystem.getPath(outputFilename);
                
                try(BufferedWriter writer = Files.newBufferedWriter(outputFile, StandardCharsets.UTF_8);){
                    walker.walk(new PrintClangCsvPlugin(writer));
                }


            } catch (IOException ex) {
                System.err.println(ex.getMessage());
                System.exit(1);
            }
        }
        
        if(bean.genImportCode()){
            try{
                if(!specParsed){
                    if(clangAST.Driver.parseSpecFile(bean.getSpecInputFile()) != 0)
                        System.exit(1);
                }
                
                String outputFilename = table.getClangSpecName() + "-import.logic";
                Path outputFile = fSystem.getPath(outputFilename);
                
                try(BufferedWriter writer = Files.newBufferedWriter(outputFile, StandardCharsets.UTF_8);){
                    Path csvOutDir = bean.getCsvOutDir();
                    if(Files.exists(csvOutDir)){
                        if(!Files.isDirectory(csvOutDir)){

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