Example usage for java.io RandomAccessFile seek

Introduction

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

Prototype

public void seek(long pos) throws IOException 

Source Link

Document

Sets the file-pointer offset, measured from the beginning of this file, at which the next read or write occurs.

Usage

From source file:com.limegroup.gnutella.metadata.MP3DataEditor.java

public int commitMetaData(String filename) {
    if (LOG.isDebugEnabled())
        LOG.debug("committing mp3 file");
    if (!LimeXMLUtils.isMP3File(filename))
        return LimeXMLReplyCollection.INCORRECT_FILETYPE;
    File f = null;//  w  w w  .  jav  a 2  s.c  o  m
    RandomAccessFile file = null;
    try {
        try {
            f = new File(filename);
            FileUtils.setWriteable(f);
            file = new RandomAccessFile(f, "rw");
        } catch (IOException e) {
            return LimeXMLReplyCollection.FILE_DEFECTIVE;
        }
        long length = 0;
        try {
            length = file.length();
            if (length < 128) //could not write - file too small
                return LimeXMLReplyCollection.FILE_DEFECTIVE;
            file.seek(length - 128);
        } catch (IOException ee) {
            return LimeXMLReplyCollection.RW_ERROR;
        }
        //1. Try to write out the ID3v2 data first
        int ret = -1;
        try {
            ret = writeID3V2DataToDisk(f);
        } catch (IOException iox) {
            return LimeXMLReplyCollection.RW_ERROR;
        } catch (ID3v2Exception e) { //catches both ID3v2 related exceptions
            ret = writeID3V1DataToDisk(file);
        }
        return ret;
    } finally {
        if (file != null) {
            try {
                file.close();
            } catch (IOException ignored) {
            }
        }
    }
}

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From source file:translator.logic.AllVendorAnnotationTranslator.java

/**
 * Reads an edf file and return an array containing start date, time and duration(in seconds)
 * @param edfFile edf to be read//  w w w .java2 s. co  m
 * @return the string array containing start date, time and duration(in seconds)
 */
public String[] readEDF(String edfFile) {
    String[] startDate = new String[2];
    @SuppressWarnings("unused")
    SimpleDateFormat df = new SimpleDateFormat("mm.dd.yyyy hh.mm.ss");
    try {
        RandomAccessFile edf = new RandomAccessFile(new File(edfFile), "r");
        edf.seek(168);
        char[] date = new char[8];
        for (int i = 0; i < 8; i++) {
            date[i] = (char) edf.readByte();
        }

        // edf.read(date);
        char[] time = new char[8];
        for (int i = 0; i < 8; i++) {
            time[i] = (char) edf.readByte();
        }
        edf.seek(236);

        char[] numRec = new char[8];
        for (int i = 0; i < 8; i++) {
            numRec[i] = (char) edf.readByte();
            //System.out.println(dur[i]);
        }
        char[] durRec = new char[8];
        for (int i = 0; i < 8; i++) {
            durRec[i] = (char) edf.readByte();
            //System.out.println(dur[i]);
        }

        // long numRec = edf.readLong();
        // long durRec = edf.readLong();
        long duration = Long.parseLong(String.valueOf(durRec).trim())
                * Long.parseLong(String.valueOf(numRec).trim());
        // long duration = 0;
        // edf.read(time);
        startDate[0] = String.valueOf(date) + " " + String.valueOf(time);
        startDate[1] = String.valueOf(duration);
        edf.close();
    } catch (Exception e) {
        e.printStackTrace();
        StringWriter errors = new StringWriter();
        e.printStackTrace(new PrintWriter(errors));
        log(errors.toString());
    }
    return startDate;
}

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From source file:org.opencb.cellbase.lib.db.VariantAnnotationCalculatorTest.java

private void skipVepFileHeader(RandomAccessFile raf) throws IOException {
    String line;//w ww.java 2s  . c o  m
    long pos;
    do {
        pos = raf.getFilePointer();
        line = raf.readLine();
    } while (line.startsWith("#"));
    raf.seek(pos);
}

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From source file:org.sbs.util.download.MultiThreadDownload.java

/**
 * //  w  w w  .j a  va2  s .  c om
 * @param url
 * @param path
 * @param fileName
 * @return
 * @throws DownLoadException
 */
@SuppressWarnings("unchecked")
public File downLoad(final URL url, String path, String fileName) throws DownLoadException {
    // ??
    this.downLen = -1;
    this.contentLen = 0;
    this.date = new Date();
    this.finished = false;
    try {
        URLConnection con = url.openConnection();
        //?
        this.contentLen = con.getContentLength();
        //??
        if (StringUtils.isBlank(fileName)) {
            fileName = StringUtils.substringAfterLast(url.getPath(), "/");
        }
        //
        File _path = new File(path);
        if (!_path.exists()) {
            _path.mkdirs();
        }
        final File file = new File(path + File.separator + fileName);
        if (file.exists())
            file.delete();
        if (this.threadNum == 0 && this.blockSize > 0) {
            this.threadNum = (int) (contentLen / blockSize);
            if (this.threadNum == 0) {
                this.threadNum = 1;
            }
        }
        long subLen = contentLen / threadNum;
        List<Future<DownLoadBean>> result = Lists.newArrayList();
        for (int i = 0; i < threadNum; i++) {
            final int pos = (int) (i * subLen);
            final int end = (int) ((i + 1) * subLen) - 1;
            final int current = pos;
            Future<DownLoadBean> f = (Future<DownLoadBean>) pool.submit(new Callable<DownLoadBean>() {
                int $pos = pos;
                int $end = end;
                int $current = current;

                @Override
                public DownLoadBean call() throws Exception {
                    //buff
                    BufferedInputStream bis = null;
                    RandomAccessFile fos = null;
                    byte[] buf = new byte[BUFFER_SIZE];
                    URLConnection con = null;
                    try {
                        con = url.openConnection();
                        con.setAllowUserInteraction(true);
                        //???startPosendPos
                        con.setRequestProperty("Range", "bytes=" + $pos + "-" + $end);
                        fos = new RandomAccessFile(file, "rw");
                        //startPos
                        fos.seek($pos);
                        //????curPos???endPos
                        //endPos?
                        bis = new BufferedInputStream(con.getInputStream());
                        while ($current < $end) {
                            int len = bis.read(buf, 0, BUFFER_SIZE);
                            if (len == -1) {
                                break;
                            }
                            fos.write(buf, 0, len);
                            $current = $current + len;
                            if ($current - 1 > $end) {
                                throw new DownLoadException(
                                        "????");
                            }
                            addLen(len);
                        }
                        bis.close();
                        fos.close();
                    } catch (IOException ex) {
                        /* ?????
                        StringBuffer sb = new StringBuffer();
                        sb.append($pos).append("\t").append($current).append("\t").append($end).append("\n");
                         FileUtils.write(new File(file.getAbsolutePath()+".pos"), sb, true);
                         */
                        throw new RuntimeException(ex);
                    }
                    log.debug(this.hashCode() + ":??[" + $pos + "," + $end + "]");
                    return new DownLoadBean($pos, $end, $current);
                }
            });
            result.add(f);
        }
        Long resultTotal = 0L;
        for (Future<DownLoadBean> f : result) {
            DownLoadBean dInfo = f.get();
            resultTotal += dInfo.getCurrent() - dInfo.getPos();
        }
        // ?
        if (contentLen > resultTotal + 1) {
            // ???
            FileUtils.write(new File(down_error_log_file), url.toString() + "\n", true);
            throw new DownLoadException("?");
        } else {
            finished = true;
            return file;
        }
    } catch (IOException | InterruptedException | ExecutionException e) {
        // 
        try {
            FileUtils.write(new File(down_error_log_file), url.toString() + "\n", true);
        } catch (IOException e1) {
            e1.printStackTrace();
        }
        e.printStackTrace();
    }
    return null;
}

---

From source file:dk.statsbiblioteket.util.LineReaderTest.java

public void dumpSequentialRA() throws Exception {
    RandomAccessFile ra = new RandomAccessFile(logfile, "r");
    for (int i = 0; i < LINES; i++) {
        ra.readLine();//  w  w w  .  ja v  a2s  .  c  o  m
    }
    Profiler profiler = new Profiler();
    profiler.setExpectedTotal(SEQUENTIAL_RUNS);
    for (int i = 0; i < SEQUENTIAL_RUNS; i++) {
        ra.seek(0);
        for (int j = 0; j < LINES; j++) {
            ra.readLine();
        }
        profiler.beat();
    }
    System.out.println("Performed " + SEQUENTIAL_RUNS + " full RA reads at "
            + Math.round(profiler.getBps(false)) + " reads/second");
}

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From source file:de.tudarmstadt.dvs.myhealthassistant.myhealthhub.fragments.EventGeneratorFragment.java

private float readCPUUsage() {
    try {//w w w.java  2s .c o  m
        RandomAccessFile reader = new RandomAccessFile("/proc/stat", "r");
        String load = reader.readLine();

        String[] toks = load.split(" ");

        long idle1 = Long.parseLong(toks[5]);
        long cpu1 = Long.parseLong(toks[2]) + Long.parseLong(toks[3]) + Long.parseLong(toks[4])
                + Long.parseLong(toks[6]) + Long.parseLong(toks[7]) + Long.parseLong(toks[8]);

        try {
            Thread.sleep(360);
        } catch (Exception e) {
        }

        reader.seek(0);
        load = reader.readLine();
        reader.close();

        toks = load.split(" ");

        long idle2 = Long.parseLong(toks[5]);
        long cpu2 = Long.parseLong(toks[2]) + Long.parseLong(toks[3]) + Long.parseLong(toks[4])
                + Long.parseLong(toks[6]) + Long.parseLong(toks[7]) + Long.parseLong(toks[8]);

        return (float) (cpu2 - cpu1) / ((cpu2 + idle2) - (cpu1 + idle1));

    } catch (IOException ex) {
        ex.printStackTrace();
    }

    return 0;
}

---

From source file:org.apache.hadoop.hdfs.server.namenode.NNStorage.java

@Override // Storage
public boolean isConversionNeeded(StorageDirectory sd) throws IOException {
    if (disablePreUpgradableLayoutCheck) {
        return false;
    }//from w  w w .j av  a2  s. co m

    File oldImageDir = new File(sd.getRoot(), "image");
    if (!oldImageDir.exists()) {
        return false;
    }
    // check the layout version inside the image file
    File oldF = new File(oldImageDir, "fsimage");
    RandomAccessFile oldFile = new RandomAccessFile(oldF, "rws");
    try {
        oldFile.seek(0);
        int oldVersion = oldFile.readInt();
        oldFile.close();
        oldFile = null;
        if (oldVersion < LAST_PRE_UPGRADE_LAYOUT_VERSION)
            return false;
    } finally {
        IOUtils.cleanup(LOG, oldFile);
    }
    return true;
}

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From source file:com.evolveum.midpoint.model.impl.controller.ModelDiagController.java

private LogFileContentType getLogFileFragment(File logFile, Long fromPosition, Long maxSize)
        throws IOException {
    LogFileContentType rv = new LogFileContentType();
    RandomAccessFile log = null;
    try {//from  w  w  w  . jav  a 2 s  . c  o m
        log = new RandomAccessFile(logFile, "r");
        long currentLength = log.length();
        rv.setLogFileSize(currentLength);

        long start;
        if (fromPosition == null) {
            start = 0;
        } else if (fromPosition >= 0) {
            start = fromPosition;
        } else {
            start = Math.max(currentLength + fromPosition, 0);
        }
        rv.setAt(start);
        log.seek(start);
        long bytesToRead = Math.max(currentLength - start, 0);
        if (maxSize != null && maxSize < bytesToRead) {
            bytesToRead = maxSize;
            rv.setComplete(false);
        } else {
            rv.setComplete(true);
        }
        if (bytesToRead == 0) {
            return rv;
        } else if (bytesToRead > Integer.MAX_VALUE) {
            throw new IllegalStateException("Too many bytes to read from log file: " + bytesToRead);
        }
        byte[] buffer = new byte[(int) bytesToRead];
        log.readFully(buffer);
        rv.setContent(new String(buffer));
        return rv;
    } finally {
        if (log != null) {
            IOUtils.closeQuietly(log);
        }
    }
}

---

From source file:FileBaseDataMap.java

/**
 * ?????.<br>/*from w w  w  .j  a v a  2 s.  co  m*/
 * ????null?.<br>
 *
 * @param
 * @return 
 * @throws
 */
public List getAllOneFileInKeys() {

    List keys = null;
    byte[] datas = null;
    StringBuffer keysBuf = null;

    try {
        if (this.nowIterationFileIndex < this.dataFileList.length) {

            keys = new ArrayList();
            datas = new byte[new Long(this.dataFileList[this.nowIterationFileIndex].length()).intValue()];

            RandomAccessFile raf = new RandomAccessFile(this.dataFileList[this.nowIterationFileIndex], "rwd");

            raf.seek(0);
            int readLen = -1;
            readLen = raf.read(datas);

            if (readLen > 0) {

                int loop = readLen / lineDataSize;

                for (int loopIdx = 0; loopIdx < loop; loopIdx++) {

                    int assist = (lineDataSize * loopIdx);
                    keysBuf = new StringBuffer();

                    int idx = 0;

                    while (true) {

                        if (datas[assist + idx] != 38) {
                            keysBuf.append(new String(datas, assist + idx, 1));
                        } else {
                            break;
                        }
                        idx++;
                    }
                    keys.add(keysBuf.toString());
                }
            }
        }
        this.nowIterationFileIndex++;
    } catch (Exception e) {
        e.printStackTrace();
    }
    return keys;
}

---

From source file:org.mhisoft.wallet.service.AttachmentService.java

/**
 * Append to the existing store for Merged and Created/Updated attachments.
 * @param filename//from  w  w w.  java2 s  .  c  om
 * @param model
 * @param encryptor
 */
protected void appendAttachmentStore(final String filename, final WalletModel model,
        final PBEEncryptor encryptor) {

    FileAccessTable t = new FileAccessTable();
    for (WalletItem item : model.getItemsFlatList()) {
        if (item.getAttachmentEntry() == null)
            continue;
        if (item.getAttachmentEntry().getAccessFlag() == FileAccessFlag.Merge) {
            t.addEntry(item.getAttachmentEntry());
        } else if (FileAccessFlag.Create == item.getAttachmentEntry().getAccessFlag()
                || FileAccessFlag.Update == item.getAttachmentEntry().getAccessFlag()) {

            if (item.getNewAttachmentEntry() != null && item.getNewAttachmentEntry().getFile() != null) {
                t.addEntry(item.getNewAttachmentEntry());
            } else if (item.getAttachmentEntry().getFile() != null) {
                t.addEntry(item.getAttachmentEntry());
            }
        }
    }

    RandomAccessFile attachmentFileStore = null;
    try {
        attachmentFileStore = new RandomAccessFile(filename, "rw");

        if (t.getSize() > 0) {

            //write the total number of entries first
            int entriesCount = attachmentFileStore.readInt();

            //add to be appended ones
            entriesCount += t.getSize();
            attachmentFileStore.seek(0);
            attachmentFileStore.writeInt(entriesCount);

            //seek to the end
            long itemStartPos = attachmentFileStore.length();
            attachmentFileStore.seek(itemStartPos);

            //append new entries to the end of the store.
            writeFileEntries(model, false, filename, itemStartPos, attachmentFileStore, t,
                    model.getEncryptorForRead(), encryptor);

        }

        /*marked the deleted entries **/
        for (WalletItem item : model.getItemsFlatList()) {
            if (item.getAttachmentEntry() == null)
                continue;
            if (FileAccessFlag.Delete == item.getAttachmentEntry().getAccessFlag() //the attachment is deleted
                    //the entry had the content saved in the store, now it is replaced. the new content is appended to the end of the file.
                    // the file entry at the old position needs to be marked as DELETE.
                    || (FileAccessFlag.Update == item.getAttachmentEntry().getAccessFlag()
                            && item.getAttachmentEntry().getEncSize() > 0)
                            && item.getAttachmentEntry().getPosition() > 0) {

                attachmentFileStore.seek(item.getAttachmentEntry().getPosition() + 40);
                attachmentFileStore.writeInt(FileAccessFlag.Delete.ordinal());
            }
        }

        attachmentFileStore.close();
        attachmentFileStore = null;

    } catch (IOException e) {
        e.printStackTrace();
        DialogUtils.getInstance().error("Error writing attachment entries.", e.getMessage());
    } finally {
        if (attachmentFileStore != null)
            try {
                attachmentFileStore.close();
            } catch (IOException e) {
                //e.printStackTrace();
            }
    }

}

---

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