Example usage for java.io File canWrite

Introduction

In this page you can find the example usage for java.io File canWrite.

Prototype

public boolean canWrite()

Source Link

Document

Tests whether the application can modify the file denoted by this abstract pathname.

Usage

From source file:Attr.java

public static void main(String args[]) {
    File path = new File(args[0]); // grab command-line argument
    String exists = getYesNo(path.exists());
    String canRead = getYesNo(path.canRead());
    String canWrite = getYesNo(path.canWrite());
    String isFile = getYesNo(path.isFile());
    String isHid = getYesNo(path.isHidden());
    String isDir = getYesNo(path.isDirectory());
    String isAbs = getYesNo(path.isAbsolute());
    System.out.println("File attributes for '" + args[0] + "'");
    System.out.println("Exists    : " + exists);
    if (path.exists()) {
        System.out.println("Readable   : " + canRead);
        System.out.println("Writable   : " + canWrite);
        System.out.println("Is directory : " + isDir);
        System.out.println("Is file    : " + isFile);
        System.out.println("Is hidden   : " + isHid);
        System.out.println("Absolute path : " + isAbs);
    }//w  ww.  jav  a2 s .c o m
}

From source file:ReadOnly.java

public static void main(String[] a) throws IOException {

    File f = new File("f");

    if (!f.createNewFile()) {
        System.out.println("Can't create new file.");
        return;// w  ww.  j a  v  a2  s  . co m
    }

    if (!f.canWrite()) {
        System.out.println("Can't write new file!");
        return;
    }

    if (!f.setReadOnly()) {
        System.out.println("Grrr! Can't set file read-only.");
        return;
    }

    if (f.canWrite()) {
        System.out.println("Most immutable, captain!");
        System.out.println("But it still says canWrite() after setReadOnly");
        return;
    } else {
        System.out.println("Logical, captain!");
        System.out.println("canWrite() correctly returns false after setReadOnly");
    }
}

From source file:Main.java

public static void main(String[] args) {
    File f = new File("C:/test.txt");

    // set file as read only
    boolean bool = f.setReadOnly();

    System.out.println("setReadonly() succeeded?: " + bool);

    // checks whether the file is writable
    bool = f.canWrite();

    System.out.print("Is file writable?: " + bool);

}

From source file:Delete.java

public static void main(String[] args) {
    String fileName = "file.txt";
    // A File object to represent the filename
    File f = new File(fileName);

    // Make sure the file or directory exists and isn't write protected
    if (!f.exists())
        throw new IllegalArgumentException("Delete: no such file or directory: " + fileName);

    if (!f.canWrite())
        throw new IllegalArgumentException("Delete: write protected: " + fileName);

    // If it is a directory, make sure it is empty
    if (f.isDirectory()) {
        String[] files = f.list();
        if (files.length > 0)
            throw new IllegalArgumentException("Delete: directory not empty: " + fileName);
    }/*from  www  .  j a v a  2  s.com*/

    // Attempt to delete it
    boolean success = f.delete();

    if (!success)
        throw new IllegalArgumentException("Delete: deletion failed");
}

From source file:at.newmedialab.ldpath.template.LDTemplate.java

public static void main(String[] args) {
    Options options = buildOptions();/*w w  w . ja v  a 2 s  .c o m*/

    CommandLineParser parser = new PosixParser();
    try {
        CommandLine cmd = parser.parse(options, args);

        Level logLevel = Level.WARN;

        if (cmd.hasOption("loglevel")) {
            String logLevelName = cmd.getOptionValue("loglevel");
            if ("DEBUG".equals(logLevelName.toUpperCase())) {
                logLevel = Level.DEBUG;
            } else if ("INFO".equals(logLevelName.toUpperCase())) {
                logLevel = Level.INFO;
            } else if ("WARN".equals(logLevelName.toUpperCase())) {
                logLevel = Level.WARN;
            } else if ("ERROR".equals(logLevelName.toUpperCase())) {
                logLevel = Level.ERROR;
            } else {
                log.error("unsupported log level: {}", logLevelName);
            }
        }

        if (logLevel != null) {
            for (String logname : new String[] { "at", "org", "net", "com" }) {

                ch.qos.logback.classic.Logger logger = (ch.qos.logback.classic.Logger) LoggerFactory
                        .getLogger(logname);
                logger.setLevel(logLevel);
            }
        }

        File template = null;
        if (cmd.hasOption("template")) {
            template = new File(cmd.getOptionValue("template"));
        }

        GenericSesameBackend backend;
        if (cmd.hasOption("store")) {
            backend = new LDPersistentBackend(new File(cmd.getOptionValue("store")));
        } else {
            backend = new LDMemoryBackend();
        }

        Resource context = null;
        if (cmd.hasOption("context")) {
            context = backend.getRepository().getValueFactory().createURI(cmd.getOptionValue("context"));
        }

        BufferedWriter out = null;
        if (cmd.hasOption("out")) {
            File of = new File(cmd.getOptionValue("out"));
            if (of.canWrite()) {
                out = new BufferedWriter(new FileWriter(of));
            } else {
                log.error("cannot write to output file {}", of);
                System.exit(1);
            }
        } else {
            out = new BufferedWriter(new OutputStreamWriter(System.out));
        }

        if (backend != null && context != null && template != null) {
            TemplateEngine<Value> engine = new TemplateEngine<Value>(backend);

            engine.setDirectoryForTemplateLoading(template.getParentFile());
            engine.processFileTemplate(context, template.getName(), out);
            out.flush();
            out.close();
        }

        if (backend instanceof LDPersistentBackend) {
            ((LDPersistentBackend) backend).shutdown();
        }

    } catch (ParseException e) {
        System.err.println("invalid arguments");
        HelpFormatter formatter = new HelpFormatter();
        formatter.printHelp("LDQuery", options, true);
    } catch (FileNotFoundException e) {
        System.err.println("file or program could not be found");
        HelpFormatter formatter = new HelpFormatter();
        formatter.printHelp("LDQuery", options, true);
    } catch (IOException e) {
        System.err.println("could not access file");
        e.printStackTrace(System.err);
    } catch (TemplateException e) {
        System.err.println("error while processing template");
        e.printStackTrace(System.err);
    }

}

From source file:cmd.freebase2rdf.java

public static void main(String[] args) throws Exception {
    if (args.length != 2) {
        usage();//w w  w  .  j  av a2  s. c om
    }
    File input = new File(args[0]);
    if (!input.exists())
        error("File " + input.getAbsolutePath() + " does not exist.");
    if (!input.canRead())
        error("Cannot read file " + input.getAbsolutePath());
    if (!input.isFile())
        error("Not a file " + input.getAbsolutePath());
    File output = new File(args[1]);
    if (output.exists())
        error("Output file " + output.getAbsolutePath()
                + " already exists, this program do not override existing files.");
    if (output.canWrite())
        error("Cannot write file " + output.getAbsolutePath());
    if (output.isDirectory())
        error("Not a file " + output.getAbsolutePath());
    if (!output.getName().endsWith(".nt.gz"))
        error("Output filename should end with .nt.gz, this is the only format supported.");

    BufferedReader in = new BufferedReader(
            new InputStreamReader(new BZip2CompressorInputStream(new FileInputStream(input))));
    BufferedOutputStream out = new BufferedOutputStream(new GZIPOutputStream(new FileOutputStream(output)));
    String line;

    ProgressLogger progressLogger = new ProgressLogger(log, "lines", 100000, 1000000);
    progressLogger.start();
    Freebase2RDF freebase2rdf = null;
    try {
        freebase2rdf = new Freebase2RDF(out);
        while ((line = in.readLine()) != null) {
            freebase2rdf.send(line);
            progressLogger.tick();
        }
    } finally {
        if (freebase2rdf != null)
            freebase2rdf.close();
    }
    print(log, progressLogger);
}

From source file:Main.java

public static void main(String[] argv) throws Exception {
    File f = new File("name.txt");

    if (!f.exists()) {
        System.out.println("File not found.");
        return;//from  ww  w  . jav a 2 s. c  o m
    }
    if (f.canRead())
        System.out.println("  Readable");
    else
        System.out.println("  Not Readable");

    if (f.canWrite())
        System.out.println("  Writable");
    else
        System.out.println("  Not Writable");
    System.out.println("  Last modified on " + new Date(f.lastModified()));

    long t = Calendar.getInstance().getTimeInMillis();
    if (!f.setLastModified(t))
        System.out.println("Can't set time.");

    if (!f.setReadOnly())
        System.out.println("Can't set to read-only.");

    if (f.canRead())
        System.out.println("  Readable");
    else
        System.out.println("  Not Readable");

    if (f.canWrite())
        System.out.println("  Writable");
    else
        System.out.println("  Not Writable");
    System.out.println("  Last modified on " + new Date(f.lastModified()));

    if (!f.setWritable(true, false))
        System.out.println("Can't return to read/write.");

    if (f.canRead())
        System.out.println("  Readable");
    else
        System.out.println("  Not Readable");

    if (f.canWrite())
        System.out.println("  Writable");
    else
        System.out.println("  Not Writable");
}

From source file:FileDemo.java

public static void main(String args[]) {
    File f1 = new File("/java/COPYRIGHT");
    System.out.println("File Name: " + f1.getName());
    System.out.println("Path: " + f1.getPath());
    System.out.println("Abs Path: " + f1.getAbsolutePath());
    System.out.println("Parent: " + f1.getParent());
    System.out.println(f1.exists() ? "exists" : "does not exist");
    System.out.println(f1.canWrite() ? "is writeable" : "is not writeable");
    System.out.println(f1.canRead() ? "is readable" : "is not readable");
    System.out.println("is " + (f1.isDirectory() ? "" : "not" + " a directory"));
    System.out.println(f1.isFile() ? "is normal file" : "might be a named pipe");
    System.out.println(f1.isAbsolute() ? "is absolute" : "is not absolute");
    System.out.println("File last modified: " + f1.lastModified());
    System.out.println("File size: " + f1.length() + " Bytes");
}

From source file:MainClass.java

public static void main(String args[]) {
    File f1 = new File("MainClass.java");
    System.out.println("File Name:" + f1.getName());
    System.out.println("Path:" + f1.getPath());
    System.out.println("Abs Path:" + f1.getAbsolutePath());
    System.out.println("Parent:" + f1.getParent());
    System.out.println(f1.exists() ? "exists" : "does not exist");
    System.out.println(f1.canWrite() ? "is writeable" : "is not writeable");
    System.out.println(f1.canRead() ? "is readable" : "is not readable");
    System.out.println("is a directory" + f1.isDirectory());
    System.out.println(f1.isFile() ? "is normal file" : "might be a named pipe");
    System.out.println(f1.isAbsolute() ? "is absolute" : "is not absolute");
    System.out.println("File last modified:" + f1.lastModified());
    System.out.println("File size:" + f1.length() + " Bytes");
}

From source file:ROW.java

public static void main(String[] args) {
    File filespec = new File("c:\text.txt");

    if (filespec.setWritable(false))
        System.out.println(filespec + " made read-only");
    else/*from   w  ww  .  ja va  2s . c  o  m*/
        System.out.println("Permission denied");
    if (filespec.setWritable(true))
        System.out.println(filespec + " made writable");
    else
        System.out.println("Permission denied");

    System.out.println(filespec + " is currently " + (filespec.canWrite() ? "writable" : "read-only"));
}