Example usage for java.io RandomAccessFile setLength

Introduction

In this page you can find the example usage for java.io RandomAccessFile setLength.

Prototype

public native void setLength(long newLength) throws IOException;

Source Link

Document

Sets the length of this file.

Usage

From source file:BridgeBasics.java

public static void main(String args[]) throws Exception {
    RServices rs = DirectJNI.getInstance().getRServices();
    rs.consoleSubmit("k=function(x){x*5}");

    System.out// ww w  . j av a 2s . co m
            .println("////////////////////////////////" + rs.callAndConvert(new RFunctionObjectName("k"), 45));

    //rs.putAndAssign(new RUnknown(o.getValue()), "b");
    //System.out.println("-------------------------------"+rs.print("h"));

    /*
            
    RServices rs =
       ServerManager.createR("toto"); 
            
       RObject ro1 = 
    rs.getObject("structure(list(1,2), caption = \"foo\")");
       RObject ro2 = 
    rs.getReference("structure(list(1,2), caption = \"foo\")");
       System.out.println(rs.callAndConvert("str", ro1));
       System.out.println(rs.callAndConvert("str", ro2));
            
            
    rs.die();
            
    if (true) return;
    */

    rs = DirectJNI.getInstance().getRServices();
    GDDevice device = rs.newDevice(400, 400);
    rs.consoleSubmit("plot(pressure)");
    System.out.println(rs.getStatus());
    byte[] buffer = device.getPng();
    RandomAccessFile raf = new RandomAccessFile("c:/te.png", "rw");
    raf.setLength(0);
    raf.write(buffer);
    raf.close();

    //rs.evaluate("x=2;y=8",2);

    /*
    RS3 s3=(RS3)rs.getReference("packageDescription('stats')");
    System.out.println("s="+Arrays.toString(s3.getClassAttribute()));
    s3.setClassAttribute(new String[] {s3.getClassAttribute()[0], "aaa"});
    rs.assignReference("f",s3);
    //rs.call("print",new RObjectName("f"));
    //System.out.println("log=" + rs.getStatus());
            
    rs.consoleSubmit("print(class(f))");
    System.out.println("log=" + rs.getStatus());
            
    RChar s = (RChar) rs.call("paste", new RChar("str1"), new RChar("str2"), new RNamedArgument("sep", new RChar(
    "--")));
    System.out.println("s=" + s);
    */

    System.exit(0);

}

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From source file:Main.java

public static void main(String[] args) {
    try {/*from   ww  w  .  jav a 2s  . c  om*/
        RandomAccessFile raf = new RandomAccessFile("c:/test.txt", "rw");

        raf.writeUTF("Hello World from java2s.com");

        // set the file pointer at 0 position
        raf.seek(0);

        // print the string
        System.out.println(raf.readUTF());

        // print current length
        System.out.println(raf.length());

        // set the file length to 30
        raf.setLength(30);

        System.out.println(raf.length());
        raf.close();
    } catch (IOException ex) {
        ex.printStackTrace();
    }

}

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From source file:edu.usc.qufd.Main.java

/**
 * The main method.// ww  w  . j ava2s . c  om
 *
 * @param args the arguments
 * @throws IOException Signals that an I/O exception has occurred.
 */
public static void main(String[] args) throws IOException {
    if (parseInputs(args) == false) {
        System.exit(-1); //The input files do not exist
    }

    /*
     * Parsing inputs: fabric & qasm file
     */
    PrintWriter outputFile;
    RandomAccessFile raf = null;
    String latencyPlaceHolder;
    if (RuntimeConfig.OUTPUT_TO_FILE) {
        latencyPlaceHolder = "Total Latency: " + Long.MAX_VALUE + " us" + System.lineSeparator();
        raf = new RandomAccessFile(outputFileAddr, "rws");
        //removing the old values in the file
        raf.setLength(0);
        //writing a place holder for the total latency
        raf.writeBytes(latencyPlaceHolder);
        raf.close();

        outputFile = new PrintWriter(new BufferedWriter(new FileWriter(outputFileAddr, true)), true);
    } else { //writing to stdout
        outputFile = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)), true);
    }
    /* parsing the input*/
    layout = LayoutParser.parse(pmdFileAddr);
    qasm = QASMParser.QASMParser(qasmFileAddr, layout);

    long totalLatency = qufd(outputFile);

    if (RuntimeConfig.OUTPUT_TO_FILE) {
        outputFile.close();
        //Over writing the place holder with the actual latency
        String latencyActual = "Total Latency: " + totalLatency + " " + layout.getTimeUnit();
        latencyActual = StringUtils.rightPad(latencyActual,
                latencyPlaceHolder.length() - System.lineSeparator().length());
        raf = new RandomAccessFile(outputFileAddr, "rws");
        //Writing to the top of a file
        raf.seek(0);
        //writing the actual total latency in the at the top of the output file
        raf.writeBytes(latencyActual + System.lineSeparator());
        raf.close();
    } else {
        outputFile.flush();
        System.out.println("Total Latency: " + totalLatency + " " + layout.getTimeUnit());
    }

    if (RuntimeConfig.VERBOSE) {
        System.out.println("Done.");
    }
    outputFile.close();
}

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From source file:Main.java

public static boolean createEmptyFile(String path, long size) throws IOException {
    File file = new File(path);
    File parent = file.getParentFile();
    parent.mkdirs();//from ww  w  . j  a v a  2  s. com
    RandomAccessFile raf = new RandomAccessFile(file, "rw");
    raf.setLength(size);
    raf.close();
    return true;
}

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From source file:Main.java

public static boolean createEmptyFile(String path, long size) throws IOException {
    File file = new File(path);
    File parent = file.getParentFile();
    parent.mkdirs();// ww  w .  ja va2  s.c  o  m
    RandomAccessFile raf = null;
    raf = new RandomAccessFile(file, "rw");
    raf.setLength(size);
    raf.close();
    return true;
}

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From source file:org.stem.db.FatFileAllocator.java

public static void allocateFile(String filePath, long sizeInMB, boolean mark) throws IOException {
    long started = System.currentTimeMillis();

    Closer closer = Closer.create();//from w w  w.  ja  v  a 2 s  .co m
    try {
        File file = new File(filePath);
        if (file.exists())
            throw new IOException(String.format("File already exists: %s", filePath));

        RandomAccessFile rw = closer.register(new RandomAccessFile(file, "rw"));
        rw.setLength(sizeInMB * 1024 * 1024);
        if (mark) {
            rw.seek(0);
            rw.writeByte(FatFile.MARKER_BLANK);
            rw.seek(rw.length() - 1);
            rw.writeByte(FatFile.MARKER_BLANK);
        }
    } catch (Throwable e) {
        throw closer.rethrow(e);
    } finally {
        closer.close();
        logger.debug("{} was allocated in {} ms", filePath, System.currentTimeMillis() - started);
    }
}

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From source file:net.timewalker.ffmq4.storage.data.impl.BlockBasedDataStoreTools.java

private static void initDataFile(File dataFile, int blockCount, int blockSize, boolean forceSync)
        throws DataStoreException {
    log.debug("Creating an empty map file (size=" + blockCount + "x" + blockSize + ") ...");

    // Create an empty file
    try {/*from   w  w w. j  a  va2  s .c  o  m*/
        RandomAccessFile dataFileMap = new RandomAccessFile(dataFile, "rw");
        dataFileMap.setLength((long) blockSize * blockCount);
        if (forceSync)
            dataFileMap.getFD().sync();
        dataFileMap.close();
    } catch (IOException e) {
        throw new DataStoreException("Cannot initialize map file " + dataFile.getAbsolutePath(), e);
    }
}

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From source file:com.abiquo.appliancemanager.ApplianceManagerAsserts.java

protected static File createUploadTempFile() throws IOException {
    Random rnd = new Random(System.currentTimeMillis());
    final String fileName = String.valueOf(rnd.nextLong());
    File file = File.createTempFile(fileName, ".uploadTest");

    RandomAccessFile f = new RandomAccessFile(file, "rw");
    f.setLength(UPLOAD_FILE_SIZE_BYTES);

    file.deleteOnExit();//from   www  .  jav  a 2  s.co  m

    return file;
}

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From source file:org.srlutils.Files.java

/** write txt to filename */
public static void writetofile(String txt, String filename) {
    try {//from w w w  .j  a  v a2  s . c  om
        String mode = "rw";
        RandomAccessFile fid = new RandomAccessFile(filename, mode);
        fid.setLength(0);
        fid.write(txt.getBytes());
        fid.close();
    } catch (Exception ex) {
        throw rte(ex, "failed to write string: %s, to file: %s", Text.summary(txt), filename);
    }
}

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From source file:org.finra.herd.core.AbstractCoreTest.java

/**
 * Creates a file of the specified size relative to the base directory.
 *
 * @param baseDirectory the local parent directory path, relative to which we want our file to be created
 * @param file the file path (including file name) relative to the base directory for the file to be created
 * @param size the file size in bytes//from   w ww. j  av a  2 s  .c o  m
 *
 * @return the created file
 */
public static File createLocalFile(String baseDirectory, String file, long size) throws IOException {
    Path filePath = Paths.get(baseDirectory, file);
    // We don't check the "mkdirs" response because the directory may already exist which would return false.
    // But we want to create sub-directories if they don't yet exist which is why we're calling "mkdirs" in the first place.
    // If an actual directory couldn't be created, then the new file below will throw an exception anyway.
    filePath.toFile().getParentFile().mkdirs();
    RandomAccessFile randomAccessFile = new RandomAccessFile(filePath.toString(), "rw");
    randomAccessFile.setLength(size);
    randomAccessFile.close();
    return filePath.toFile();
}

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