Example usage for java.io RandomAccessFile seek

List of usage examples for java.io RandomAccessFile seek

  1. HOME
  2. Java
  3. java
  4. java.io.*
  5. RandomAccessFile
  6. 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:org.mhisoft.wallet.service.AttachmentService.java

/**
 * abandon the old store and transfer everthing to the wnew store.
 * The same model for both old and new store.
 *
 * @param oldStorefName/*from w  w  w .j a v  a 2  s.  co  m*/
 * @param model
 * @param encryptor
 */
protected void compactAttachmentStore(final String oldStorefName, final WalletModel model,
        final PBEEncryptor encryptor) {
    String newStoreName = oldStorefName + ".tmp";
    File newFile = new File(newStoreName);
    if (newFile.exists()) {
        if (!newFile.delete()) {
            DialogUtils.getInstance().error("Can't delete the tmp file:" + newStoreName);
        }
    }

    FileAccessTable t = new FileAccessTable();
    for (WalletItem item : model.getItemsFlatList()) {
        if (item.getAttachmentEntry() == null)
            continue;

        if (item.getAttachmentEntry().getAccessFlag() == FileAccessFlag.None) {
            //no change , need to transfer to the new file.
            t.addEntry(item.getAttachmentEntry());
        } else if (item.getAttachmentEntry().getAccessFlag() == FileAccessFlag.Merge) {
            t.addEntry(item.getAttachmentEntry());
        } else if (FileAccessFlag.Create == item.getAttachmentEntry().getAccessFlag()
                || FileAccessFlag.Update == item.getAttachmentEntry().getAccessFlag()) {
            if (item.getAttachmentEntry() != null) {
                if (item.getAttachmentEntry().getNewEntry() != null)
                    t.addEntry(item.getNewAttachmentEntry());
                else
                    item.getAttachmentEntry();
            }
        }
    }

    RandomAccessFile attachmentFileStore = null;
    if (t.getSize() > 0) {
        try {
            attachmentFileStore = new RandomAccessFile(newStoreName, "rw");
            attachmentFileStore.seek(0);
            attachmentFileStore.writeInt(t.getSize());

            writeFileEntries(model, true, oldStorefName, 4, attachmentFileStore, t, model.getEncryptorForRead(),
                    encryptor);

            attachmentFileStore.close();
            attachmentFileStore = null;

            //now do the swap of the store to the new one.
            new File(oldStorefName).delete();
            newFile.renameTo(new File(oldStorefName));

        } catch (IOException e) {
            e.printStackTrace();
            DialogUtils.getInstance().error("compactAttachmentStore() failed", e.getMessage());
        } finally {
            if (attachmentFileStore != null)
                try {
                    attachmentFileStore.close();
                } catch (IOException e) {
                    //e.printStackTrace();
                }
        }
    } else {
        //need to handle all images are deleted
        //just remove the old store.
        new File(oldStorefName).delete();
    }

}

From source file:com.teletalk.jserver.util.filedb.LowLevelFileDBTest.java

/**
 * testCorruptData/*from www.j  a  v  a 2 s.c  om*/
 */
public void testCorruptData() {
    logger.info("BEGIN testCorruptData.");

    String fileNameBase = BASE_PATH + "fileDBCorrupt/fileDBCorrupt";
    new File(fileNameBase).mkdirs();

    try {
        new File(fileNameBase + ".idx").delete();
        new File(fileNameBase + ".dat").delete();

        final int allocationUnitSize = 10;
        final int blockSize = (allocationUnitSize + DefaultDataFile.BLOCK_HEADER_SIZE
                + DefaultDataFile.BLOCK_FOOTER_SIZE);

        LowLevelFileDB lowLevelFileDB = new LowLevelFileDB("LowLevelFileDB", fileNameBase, blockSize, 2, 2,
                LowLevelFileDB.READ_WRITE_MODE);

        String dataString = "DATA123456";
        byte[] data = dataString.getBytes();
        lowLevelFileDB.insertItem("key1", data);
        lowLevelFileDB.insertItem("key2", data);
        lowLevelFileDB.insertItem("key3", data);

        lowLevelFileDB.closeFileDB();

        byte[] corruptHeader = new byte[DefaultDataFile.BLOCK_HEADER_SIZE];

        // Destroy header of first data block
        RandomAccessFile randomAccessFile = new RandomAccessFile(fileNameBase + ".dat", "rw");
        randomAccessFile.seek(DefaultDataFile.DATA_FILE_HEADER_SIZE);
        randomAccessFile.write(corruptHeader);
        randomAccessFile.close();

        // Destroy header of second index block
        randomAccessFile = new RandomAccessFile(fileNameBase + ".idx", "rw");
        randomAccessFile.seek(DefaultDataFile.DATA_FILE_HEADER_SIZE + lowLevelFileDB.getIndexFileBlockSize());
        randomAccessFile.write(corruptHeader);
        randomAccessFile.close();

        // Reopen
        lowLevelFileDB = new LowLevelFileDB("LowLevelFileDB", fileNameBase, 20, 2, 2,
                LowLevelFileDB.READ_WRITE_MODE);

        byte[] readData = lowLevelFileDB.getItem("key1");
        if (readData != null)
            super.fail("Item with key 'key1' shouldn't exist!");
        readData = lowLevelFileDB.getItem("key2");
        if (readData != null)
            super.fail("Item with key 'key2' shouldn't exist!");
        readData = lowLevelFileDB.getItem("key3");
        if (readData == null)
            super.fail("Item with key 'key3' wasn't found!");
        if (!dataString.equals(new String(readData)))
            super.fail("Data for item with key 'key3' was invalid!");

        lowLevelFileDB.closeFileDB();

        FileDeletor.delete("fileDBCorrupt");
        new File(fileNameBase + ".idx").delete();
        new File(fileNameBase + ".dat").delete();
    } catch (Exception e) {
        e.printStackTrace();
        super.fail("Error - " + e);
    }

    logger.info("END testCorruptData.");
}

From source file:com.roamprocess1.roaming4world.ui.messages.MessageAdapter.java

public boolean resumeImages(String msgSubject) {
    File file = null;// w  w  w  . j a  va2 s  .  c  o m
    long fileLength;

    try {

        String filename = "", num = "";

        URL url = new URL(imageUrl);
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setRequestMethod("GET");
        connection.setDoOutput(true);
        connection.connect();

        num = getNumber(msgSubject);
        filename = getTimestamp(msgSubject);

        file = new File(fileDir + "/" + getNumber(msgSubject) + "/Recieved", filename);
        if (!file.exists()) {
            file.createNewFile();
        }

        FileOutputStream fileOutput = new FileOutputStream(file);
        InputStream inputStream = connection.getInputStream();
        int totalSize = connection.getContentLength();
        Long downloadedSize = (long) 0;
        byte[] buffer = new byte[1024];
        int bufferLength = 0;
        while ((bufferLength = inputStream.read(buffer)) > 0) {
            fileOutput.write(buffer, 0, bufferLength);
            downloadedSize += bufferLength;
            Log.i("Progress:", "downloadedSize:" + downloadedSize + "totalSize:" + totalSize);
        }
        fileOutput.close();
        Log.d("downloadedSize", downloadedSize + " @");
        if (downloadedSize == totalSize) {
            downloadedimageuri = file.getAbsolutePath();
            return true;
        }

        if (file.exists()) {
            connection.setAllowUserInteraction(true);
            connection.setRequestProperty("Range", "bytes=" + file.length() + "-");
        }

        connection.setConnectTimeout(14000);
        connection.setReadTimeout(20000);
        connection.connect();

        if (connection.getResponseCode() / 100 != 2)
            throw new Exception("Invalid response code!");
        else {
            String connectionField = connection.getHeaderField("content-range");

            if (connectionField != null) {
                String[] connectionRanges = connectionField.substring("bytes=".length()).split("-");
                downloadedSize = Long.valueOf(connectionRanges[0]);
            }

            if (connectionField == null && file.exists())
                file.delete();

            fileLength = connection.getContentLength() + downloadedSize;
            BufferedInputStream input = new BufferedInputStream(connection.getInputStream());
            RandomAccessFile output = new RandomAccessFile(file, "rw");
            output.seek(downloadedSize);

            byte data[] = new byte[1024];
            int count = 0;
            int __progress = 0;

            while ((count = input.read(data, 0, 1024)) != -1 && __progress != 100) {
                downloadedSize += count;
                output.write(data, 0, count);
                __progress = (int) ((downloadedSize * 100) / fileLength);
            }

            output.close();
            input.close();

        }

    } catch (Exception e) {
        e.printStackTrace();
        return false;
    }
    return false;

}

From source file:hydrograph.ui.perspective.dialog.PreStartActivity.java

private boolean updateINIOnJDKUpgrade(String javaHome) {
    logger.debug("Updating INI file if JDK path is updated");
    RandomAccessFile file = null;
    boolean isUpdated = false;
    try {/*from  w ww  .  j  av  a  2  s  . c  o  m*/
        file = new RandomAccessFile(new File(HYDROGRAPH_INI), "rw");
        byte[] text = new byte[(int) file.length()];

        while (file.getFilePointer() != file.length()) {
            if (StringUtils.equals(file.readLine(), "-vm")) {
                String currentLine = file.readLine();
                if (StringUtils.equals(currentLine, javaHome)) {
                    logger.debug("JAVA_HOME and -vm in configuration file are same");
                } else {
                    logger.debug(
                            "JAVA_HOME and -vm in configuration file are different. Updating configuration file with JAVA_HOME");
                    file.seek(0);
                    file.readFully(text);
                    file.seek(0);
                    updateData(text, javaHome, currentLine, file);
                    isUpdated = true;
                }
                break;
            }
        }
    } catch (IOException ioException) {
        logger.error("IOException occurred while updating " + HYDROGRAPH_INI + " file", ioException);
    } finally {
        try {
            if (file != null) {
                file.close();
            }
        } catch (IOException ioException) {
            logger.error("IOException occurred while closing " + HYDROGRAPH_INI + " file", ioException);
        }
    }
    return isUpdated;
}

From source file:com.qumasoft.qvcslib.CompareFilesWithApacheDiff.java

private CompareLineInfo[] buildLinesFromFile(File inFile) throws IOException {
    List<CompareLineInfo> lineInfoList = new ArrayList<>();
    RandomAccessFile randomAccessFile = new RandomAccessFile(inFile, "r");
    long fileLength = randomAccessFile.length();
    int startOfLineSeekPosition = 0;
    int currentSeekPosition = 0;
    byte character;
    while (currentSeekPosition < fileLength) {
        character = randomAccessFile.readByte();
        currentSeekPosition = (int) randomAccessFile.getFilePointer();
        if (character == '\n') {
            int endOfLine = (int) randomAccessFile.getFilePointer();
            byte[] buffer = new byte[endOfLine - startOfLineSeekPosition];
            randomAccessFile.seek(startOfLineSeekPosition);
            randomAccessFile.readFully(buffer);
            String line = new String(buffer, UTF8);
            CompareLineInfo lineInfo = new CompareLineInfo(startOfLineSeekPosition, createCompareLine(line));
            lineInfoList.add(lineInfo);//from ww  w . j  a v  a 2s .  c o  m
            startOfLineSeekPosition = endOfLine;
        }
    }
    // Add the final line which can happen if it doesn't end in a newline.
    if ((fileLength - startOfLineSeekPosition) > 0L) {
        byte[] buffer = new byte[(int) fileLength - startOfLineSeekPosition];
        randomAccessFile.seek(startOfLineSeekPosition);
        randomAccessFile.readFully(buffer);
        String line = new String(buffer, UTF8);
        CompareLineInfo lineInfo = new CompareLineInfo(startOfLineSeekPosition, createCompareLine(line));
        lineInfoList.add(lineInfo);
    }
    CompareLineInfo[] lineInfoArray = new CompareLineInfo[lineInfoList.size()];
    int i = 0;
    for (CompareLineInfo lineInfo : lineInfoList) {
        lineInfoArray[i++] = lineInfo;
    }
    return lineInfoArray;
}

From source file:com.louding.frame.http.download.FileEntityHandler.java

public File handleEntity(HttpEntity entity, DownloadProgress callback, File save, boolean isResume)
        throws IOException {
    long current = 0;
    RandomAccessFile file = new RandomAccessFile(save, "rw");
    if (isResume) {
        current = file.length();/*from  w  w w .jav  a2 s  .  c o  m*/
    }
    InputStream input = entity.getContent();
    long count = entity.getContentLength() + current;
    if (mStop) {
        FileUtils.closeIO(file);
        return save;
    }
    // ???????
    /**
     *  <br>
     * current = input.skip(current); <br>
     * file.seek(current); <br>
     * ?JDKInputstream.skip(long i)i<br>
     * ? n ???????
     */
    file.seek(input.skip(current));

    int readLen = 0;
    byte[] buffer = new byte[1024];

    while ((readLen = input.read(buffer, 0, 1024)) != -1) {
        if (mStop) {
            break;
        } else {
            file.write(buffer, 0, readLen);
            current += readLen;
            callback.onProgress(count, current);
        }
    }
    callback.onProgress(count, current);

    if (mStop && current < count) { // ?
        FileUtils.closeIO(file);
        throw new IOException("user stop download thread");
    }
    FileUtils.closeIO(file);
    return save;
}

From source file:org.apache.flume.channel.file.TestFlumeEventQueue.java

@Test(expected = BadCheckpointException.class)
public void testCorruptInflightPuts() throws Exception {
    RandomAccessFile inflight = null;
    try {//from  w w  w . j av a2  s.c  om
        queue = new FlumeEventQueue(backingStore, backingStoreSupplier.getInflightTakes(),
                backingStoreSupplier.getInflightPuts());
        long txnID1 = new Random().nextInt(Integer.MAX_VALUE - 1);
        long txnID2 = txnID1 + 1;
        queue.addWithoutCommit(new FlumeEventPointer(1, 1), txnID1);
        queue.addWithoutCommit(new FlumeEventPointer(2, 1), txnID1);
        queue.addWithoutCommit(new FlumeEventPointer(2, 2), txnID2);
        queue.checkpoint(true);
        TimeUnit.SECONDS.sleep(3L);
        inflight = new RandomAccessFile(backingStoreSupplier.getInflightPuts(), "rw");
        inflight.seek(0);
        inflight.writeInt(new Random().nextInt());
        queue = new FlumeEventQueue(backingStore, backingStoreSupplier.getInflightTakes(),
                backingStoreSupplier.getInflightPuts());
        SetMultimap<Long, Long> deserializedMap = queue.deserializeInflightPuts();
        Assert.assertTrue(deserializedMap.get(txnID1).contains(new FlumeEventPointer(1, 1).toLong()));
        Assert.assertTrue(deserializedMap.get(txnID1).contains(new FlumeEventPointer(2, 1).toLong()));
        Assert.assertTrue(deserializedMap.get(txnID2).contains(new FlumeEventPointer(2, 2).toLong()));
    } finally {
        inflight.close();
    }
}

From source file:org.apache.flume.channel.file.TestFlumeEventQueue.java

@Test(expected = BadCheckpointException.class)
public void testCorruptInflightTakes() throws Exception {
    RandomAccessFile inflight = null;
    try {//from  w  w w .  java  2s . co m
        queue = new FlumeEventQueue(backingStore, backingStoreSupplier.getInflightTakes(),
                backingStoreSupplier.getInflightPuts());
        long txnID1 = new Random().nextInt(Integer.MAX_VALUE - 1);
        long txnID2 = txnID1 + 1;
        queue.addWithoutCommit(new FlumeEventPointer(1, 1), txnID1);
        queue.addWithoutCommit(new FlumeEventPointer(2, 1), txnID1);
        queue.addWithoutCommit(new FlumeEventPointer(2, 2), txnID2);
        queue.checkpoint(true);
        TimeUnit.SECONDS.sleep(3L);
        inflight = new RandomAccessFile(backingStoreSupplier.getInflightTakes(), "rw");
        inflight.seek(0);
        inflight.writeInt(new Random().nextInt());
        queue = new FlumeEventQueue(backingStore, backingStoreSupplier.getInflightTakes(),
                backingStoreSupplier.getInflightPuts());
        SetMultimap<Long, Long> deserializedMap = queue.deserializeInflightTakes();
        Assert.assertTrue(deserializedMap.get(txnID1).contains(new FlumeEventPointer(1, 1).toLong()));
        Assert.assertTrue(deserializedMap.get(txnID1).contains(new FlumeEventPointer(2, 1).toLong()));
        Assert.assertTrue(deserializedMap.get(txnID2).contains(new FlumeEventPointer(2, 2).toLong()));
    } finally {
        inflight.close();
    }
}

From source file:org.commoncrawl.service.crawler.CrawlLog.java

private static void updateLogFileHeader(File logFileName, LogFileHeader header, long addedRecordCount)
        throws IOException {

    RandomAccessFile file = new RandomAccessFile(logFileName, "rw");

    try {/*from   ww w  . j  a  va2  s.  c  o  m*/

        // update cached header ...
        header._fileSize = file.getChannel().size();
        header._itemCount += addedRecordCount;
        // set the position at zero ..
        file.seek(0);
        // and write header to disk ...
        header.writeHeader(file);
    } finally {
        // major bottle neck..
        // file.getFD().sync();
        file.close();
    }
}

From source file:com.landenlabs.all_devtool.ConsoleFragment.java

/**
 * Gets total system cpu usage (not just this app)
 * @return//from   w  w w .j av  a  2  s  .  c  o m
 */
private float getCpuUsage() {
    try {
        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;
}