Example usage for java.io RandomAccessFile RandomAccessFile

Introduction

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

Prototype

public RandomAccessFile(File file, String mode) throws FileNotFoundException 

Source Link

Document

Creates a random access file stream to read from, and optionally to write to, the file specified by the File argument.

Usage

From source file:edu.mbl.jif.imaging.mmtiff.MultipageTiffWriter.java

public MultipageTiffWriter(String directory, String filename, JSONObject summaryMD,
        TaggedImageStorageMultipageTiff mpTiffStorage) {
    masterMPTiffStorage_ = mpTiffStorage;
    omeTiff_ = mpTiffStorage.omeTiff_;/*  w  w w.ja v  a  2  s .  c  o  m*/
    reader_ = new MultipageTiffReader(summaryMD);
    File f = new File(directory + "/" + filename);

    try {
        processSummaryMD(summaryMD);
    } catch (MMScriptException ex1) {
        ReportingUtils.logError(ex1);
    } catch (JSONException ex) {
        ReportingUtils.logError(ex);
    }

    //This is an overestimate of file size because file gets truncated at end
    long fileSize = Math.min(MAX_FILE_SIZE, summaryMD.toString().length() + 2000000
            + numFrames_ * numChannels_ * numSlices_ * ((long) bytesPerImagePixels_ + 2000));

    try {
        f.createNewFile();
        raFile_ = new RandomAccessFile(f, "rw");
        try {
            raFile_.setLength(fileSize);
        } catch (IOException e) {
            new Thread(new Runnable() {
                public void run() {
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException ex) {
                    }
                    //MMStudioMainFrame.getInstance().getAcquisitionEngine().abortRequest();
                }
            }).start();
            ReportingUtils.showError("Insufficent space on disk: no room to write data");
        }
        fileChannel_ = raFile_.getChannel();
        indexMap_ = new HashMap<String, Long>();
        reader_.setFileChannel(fileChannel_);
        reader_.setIndexMap(indexMap_);
        buffers_ = new LinkedList<ByteBuffer>();

        writeMMHeaderAndSummaryMD(summaryMD);
    } catch (IOException ex) {
        ReportingUtils.logError(ex);
    }
    try {
        summaryMDString_ = summaryMD.toString(2);
    } catch (JSONException ex) {
        summaryMDString_ = "";
    }
}

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From source file:com.example.android.vault.EncryptedDocument.java

/**
 * Decrypt and read content section of this document, writing it into the
 * given pipe./*from   ww w .j  a v a2 s . c  om*/
 * <p/>
 * Pipe is left open, so caller is responsible for calling
 * {@link ParcelFileDescriptor#close()} or
 * {@link ParcelFileDescriptor#closeWithError(String)}.
 *
 * @param contentOut write end of a pipe.
 * @throws DigestException if content fails MAC check. Some or all content
 *                         may have already been written to the pipe when the MAC is
 *                         validated.
 */
public void readContent(ParcelFileDescriptor contentOut) throws IOException, GeneralSecurityException {
    final RandomAccessFile f = new RandomAccessFile(mFile, "r");
    try {
        assertMagic(f);

        if (f.length() <= CONTENT_OFFSET) {
            throw new IOException("Document has no content");
        }

        // Skip over metadata section
        f.seek(CONTENT_OFFSET);
        readSection(f, new FileOutputStream(contentOut.getFileDescriptor()));

    } finally {
        f.close();
    }
}

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From source file:com.thinkberg.moxo.vfs.s3.jets3t.Jets3tFileObject.java

private FileChannel getCacheFileChannel() throws IOException {
    if (cacheFile == null) {
        cacheFile = File.createTempFile("moxo.", ".s3");
    }/*from w  w w. j a v  a 2s  .  co m*/
    return new RandomAccessFile(cacheFile, "rw").getChannel();
}

---

From source file:hudson.util.TextFile.java

/**
 * Efficiently reads the last N characters (or shorter, if the whole file is shorter than that.)
 *
 * <p>//  w w  w.jav a2 s  .co  m
 * This method first tries to just read the tail section of the file to get the necessary chars.
 * To handle multi-byte variable length encoding (such as UTF-8), we read a larger than
 * necessary chunk.
 *
 * <p>
 * Some multi-byte encoding, such as Shift-JIS (http://en.wikipedia.org/wiki/Shift_JIS) doesn't
 * allow the first byte and the second byte of a single char to be unambiguously identified,
 * so it is possible that we end up decoding incorrectly if we start reading in the middle of a multi-byte
 * character. All the CJK multi-byte encodings that I know of are self-correcting; as they are ASCII-compatible,
 * any ASCII characters or control characters will bring the decoding back in sync, so the worst
 * case we just have some garbage in the beginning that needs to be discarded. To accommodate this,
 * we read additional 1024 bytes.
 *
 * <p>
 * Other encodings, such as UTF-8, are better in that the character boundary is unambiguous,
 * so there can be at most one garbage char. For dealing with UTF-16 and UTF-32, we read at
 * 4 bytes boundary (all the constants and multipliers are multiples of 4.)
 *
 * <p>
 * Note that it is possible to construct a contrived input that fools this algorithm, and in this method
 * we are willing to live with a small possibility of that to avoid reading the whole text. In practice,
 * such an input is very unlikely.
 *
 * <p>
 * So all in all, this algorithm should work decently, and it works quite efficiently on a large text.
 */
public @Nonnull String fastTail(int numChars, Charset cs) throws IOException {
    RandomAccessFile raf = new RandomAccessFile(file, "r");

    try {
        long len = raf.length();
        // err on the safe side and assume each char occupies 4 bytes
        // additional 1024 byte margin is to bring us back in sync in case we started reading from non-char boundary.
        long pos = Math.max(0, len - (numChars * 4 + 1024));
        raf.seek(pos);

        byte[] tail = new byte[(int) (len - pos)];
        raf.readFully(tail);

        String tails = cs.decode(java.nio.ByteBuffer.wrap(tail)).toString();

        return new String(tails.substring(Math.max(0, tails.length() - numChars))); // trim the baggage of substring by allocating a new String
    } finally {
        raf.close();
    }
}

---

From source file:com.parse.ParseKeyValueCache.java

static String loadFromKeyValueCache(final String key, final long maxAgeMilliseconds) {
    synchronized (MUTEX_IO) {
        File file = getKeyValueCacheFile(key);
        if (file == null) {
            return null;
        }/*from  w ww .j a v  a2 s  .  co m*/

        Date now = new Date();
        long oldestAcceptableAge = Math.max(0, now.getTime() - maxAgeMilliseconds);
        if (getKeyValueCacheAge(file) < oldestAcceptableAge) {
            return null;
        }

        // Update mtime to make the LRU work
        file.setLastModified(now.getTime());

        try {
            RandomAccessFile f = new RandomAccessFile(file, "r");
            byte[] bytes = new byte[(int) f.length()];
            f.readFully(bytes);
            f.close();
            return new String(bytes, "UTF-8");
        } catch (IOException e) {
            PLog.e(TAG, "error reading from cache", e);
            return null;
        }
    }
}

---

From source file:biz.neustar.nexus.plugins.gitlab.GitlabAuthenticatingRealmIT.java

License:asdf

@Override
protected NexusBundleConfiguration configureNexus(final NexusBundleConfiguration configuration) {
    try {//from  ww  w .  j a v  a 2 s. c om
        // request 1 - good
        server.enqueue(new MockResponse().setHeader(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON)
                .setBody(loadBody("good_user.json")));
        // request 2 - bad, no user found
        server.enqueue(new MockResponse().setHeader(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON)
                .setResponseCode(404).setStatus("Not Found"));
        // request 3 - bad, auth failed against gitlab
        server.enqueue(new MockResponse().setHeader(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON)
                .setResponseCode(401).setStatus("Unauthorized"));
        server.play();
    } catch (Exception e) {
        e.printStackTrace();
        throw new RuntimeException(e);
    }

    System.out.println("MOCK SERVER: " + server.getHostName() + " " + server.getPort());

    // override the format of the nexus.log file
    configuration.setLogPattern("%d{HH:mm:ss.SSS} %-5level - %msg%n");

    // configure logging level of example plugins running in nexus
    configuration.setLogLevel("DEBUG");
    configuration.setStartTimeout(120);

    Model model = getPomInfo();
    String pluginName = model.getArtifactId() + "-" + model.getVersion();
    File plugin = new File("target/" + pluginName + "-bundle.zip");
    assertTrue(plugin.exists());

    configuration.addPlugins(plugin);

    // why does this work in the examples.. pom is missing for me..
    /*
    configuration.addPlugins(
        artifactResolver()
        .resolveFromDependencyManagement("biz.neustar.nexus", "nexus-gitlab-token-auth-plugin", "nexus-plugin", (String)null, "zip", "bundle")
                //.resolvePluginFromDependencyManagement("biz.neustar.nexus", "nexus-gitlab-token-auth-plugin")
    );
    */

    File tempPluginConfig = testData().resolveFile("gitlab-plugin-temp.xml");
    // from the mock server
    try (RandomAccessFile tempConfig = new RandomAccessFile(tempPluginConfig, "r");
            RandomAccessFile gitlabConfig = new RandomAccessFile(
                    tempPluginConfig.getParent() + "/gitlab-plugin.xml", "rw");) {
        gitlabConfig.setLength(0); // truncate.
        String line = tempConfig.readLine();
        while (line != null) {
            // GITLAB_URL
            gitlabConfig
                    .write(line.replace("GITLAB_URL", "http://" + server.getHostName() + ":" + server.getPort())
                            .getBytes(UTF_8));
            gitlabConfig.write('\n');
            line = tempConfig.readLine();
        }
    } catch (Exception e) {
        e.printStackTrace();
        throw new RuntimeException(e);
    }

    // <realm>NexusGitlabAuthenticationRealm</realm>
    configuration.addOverlays(
            overlays.copy().file(file(testData().resolveFile("gitlab-plugin.xml"))).to()
                    .directory(path("sonatype-work/nexus/conf")),
            overlays.copy().file(file(testData().resolveFile("security-configuration.xml"))).to()
                    .directory(path("sonatype-work/nexus/conf")));

    return configuration;
}

---

From source file:jp.andeb.obbutil.ObbUtilMain.java

private static boolean doRemove(String[] args) {
    if (args.length != 1) {
        printUsage(PROGNAME);//www.  ja  va2s . co  m
        return false;
    }
    final File targetFile = new File(args[0]);
    final RandomAccessFile targetRaFile;
    try {
        targetRaFile = new RandomAccessFile(targetFile, "rw");
    } catch (FileNotFoundException e) {
        System.err.println("????: " + targetFile.getPath());
        return false;
    }
    try {
        final ObbInfoV1 obbInfo;
        try {
            obbInfo = ObbInfoV1.fromFile(targetRaFile);
        } catch (IOException e) {
            System.err
                    .println("????????: " + targetFile.getPath());
            return false;
        } catch (NotObbException e) {
            System.err.println(
                    "? OBB ???????: " + targetFile.getPath());
            return false;
        }

        final ByteBuffer obbInfoBytes = obbInfo.toBytes();
        targetRaFile.setLength(targetRaFile.length() - obbInfoBytes.remaining());
    } catch (IOException e) {
        System.err.println("OBB ??????: " + targetFile.getPath());
        return false;
    } finally {
        try {
            targetRaFile.close();
        } catch (IOException e) {
            System.err.println("OBB ??????: " + targetFile.getPath());
            return false;
        }
    }

    System.err.println("OBB ???????: " + targetFile.getPath());
    return true;
}

---

From source file:com.qubole.rubix.core.TestCachingInputStream.java

private void writeZeros(String filename, int start, int end) throws IOException {
    File file = new File(filename);
    RandomAccessFile raf = new RandomAccessFile(file, "rw");
    raf.seek(start);//from w w w.ja v  a2  s  .  c  o m
    String s = "0";
    StandardCharsets.UTF_8.encode(s);
    for (int i = 0; i < (end - start); i++) {
        raf.writeBytes(s);
    }
    raf.close();
}

---

From source file:au.org.ala.spatial.util.RecordsSmall.java

private void makeUniquePoints() throws Exception {
    //make unique points and index
    points = new RandomAccessFile(filename + "records.csv.small.points", "r");
    double[] allPoints = getPointsAll();
    Coord[] p = new Coord[allPoints.length / 2];
    for (int i = 0; i < allPoints.length; i += 2) {
        p[i / 2] = new Coord(allPoints[i], allPoints[i + 1], i / 2);
    }//from  ww  w.ja v a  2s.  co m
    allPoints = null; //make available to GC
    Arrays.sort(p, new Comparator<Coord>() {
        public int compare(Coord o1, Coord o2) {
            return o1.longitude == o2.longitude
                    ? (o1.latitude == o2.latitude ? 0 : (o1.latitude - o2.latitude > 0.0 ? 1 : -1))
                    : (o1.longitude - o2.longitude > 0.0 ? 1 : -1);
        }
    });

    DataOutputStream outputUniquePoints = new DataOutputStream(
            new BufferedOutputStream(new FileOutputStream(filename + "records.csv.small.pointsUniquePoints")));
    DataOutputStream outputUniqueIdx = new DataOutputStream(
            new BufferedOutputStream(new FileOutputStream(filename + "records.csv.small.pointsUniqueIdx")));

    int pos = -1; //first point is set after pos++
    int[] newPos = new int[p.length];
    for (int i = 0; i < p.length; i++) {
        if (i == 0 || p[i].latitude != p[i - 1].latitude || p[i].longitude != p[i - 1].longitude) {
            outputUniquePoints.writeDouble(p[i].latitude);
            outputUniquePoints.writeDouble(p[i].longitude);
            pos++;
        }
        newPos[p[i].pos] = pos;
    }
    for (int i = 0; i < p.length; i++) {
        outputUniqueIdx.writeInt(newPos[i]);
    }

    outputUniqueIdx.flush();
    outputUniqueIdx.close();
    outputUniquePoints.flush();
    outputUniquePoints.close();

    points.close();
}

---

From source file:de.knowwe.visualization.util.Utils.java

private static boolean isFileClosedWindows(File file) {
    boolean closed;
    FileChannel channel = null;/*  w  ww  .j ava  2s  .  co  m*/
    try {
        channel = new RandomAccessFile(file, "rw").getChannel();
        closed = true;
    } catch (Exception ex) {
        closed = false;
    } finally {
        if (channel != null) {
            try {
                channel.close();
            } catch (IOException ex) {
                // exception handling
            }
        }
    }
    return closed;
}

---

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