Example usage for java.nio.channels FileChannel read

List of usage examples for java.nio.channels FileChannel read

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Introduction

In this page you can find the example usage for java.nio.channels FileChannel read.

Prototype

public final long read(ByteBuffer[] dsts) throws IOException

Source Link

Document

Reads a sequence of bytes from this channel into the given buffers.

Usage

From source file:com.owncloud.android.oc_framework.network.webdav.FileRequestEntity.java

@Override
public void writeRequest(final OutputStream out) throws IOException {
    //byte[] tmp = new byte[4096];
    ByteBuffer tmp = ByteBuffer.allocate(4096);
    int readResult = 0;

    // TODO(bprzybylski): each mem allocation can throw OutOfMemoryError we need to handle it
    //                    globally in some fashionable manner
    RandomAccessFile raf = new RandomAccessFile(mFile, "r");
    FileChannel channel = raf.getChannel();
    Iterator<OnDatatransferProgressListener> it = null;
    long transferred = 0;
    long size = mFile.length();
    if (size == 0)
        size = -1;/*from www  . ja va 2s . co  m*/
    try {
        while ((readResult = channel.read(tmp)) >= 0) {
            out.write(tmp.array(), 0, readResult);
            tmp.clear();
            transferred += readResult;
            synchronized (mDataTransferListeners) {
                it = mDataTransferListeners.iterator();
                while (it.hasNext()) {
                    it.next().onTransferProgress(readResult, transferred, size, mFile.getName());
                }
            }
        }

    } catch (IOException io) {
        Log.e("FileRequestException", io.getMessage());
        throw new RuntimeException(
                "Ugly solution to workaround the default policy of retries when the server falls while uploading ; temporal fix; really",
                io);

    } finally {
        channel.close();
        raf.close();
    }
}

From source file:eu.alefzero.webdav.FileRequestEntity.java

@Override
public void writeRequest(final OutputStream out) throws IOException {
    //byte[] tmp = new byte[4096];
    ByteBuffer tmp = ByteBuffer.allocate(4096);
    int readResult = 0;

    // TODO(bprzybylski): each mem allocation can throw OutOfMemoryError we need to handle it
    //                    globally in some fashionable manner
    RandomAccessFile raf = new RandomAccessFile(mFile, "r");
    FileChannel channel = raf.getChannel();
    Iterator<OnDatatransferProgressListener> it = null;
    long transferred = 0;
    long size = mFile.length();
    if (size == 0)
        size = -1;/*ww w  .j  a  v  a 2s .  co m*/
    try {
        while ((readResult = channel.read(tmp)) >= 0) {
            out.write(tmp.array(), 0, readResult);
            tmp.clear();
            transferred += readResult;
            synchronized (mDataTransferListeners) {
                it = mDataTransferListeners.iterator();
                while (it.hasNext()) {
                    it.next().onTransferProgress(readResult, transferred, size, mFile.getName());
                }
            }
        }

    } catch (IOException io) {
        Log_OC.e("FileRequestException", io.getMessage());
        throw new RuntimeException(
                "Ugly solution to workaround the default policy of retries when the server falls while uploading ; temporal fix; really",
                io);

    } finally {
        channel.close();
        raf.close();
    }
}

From source file:com.owncloud.android.lib.common.network.FileRequestEntity.java

@Override
public void writeRequest(final OutputStream out) throws IOException {
    //byte[] tmp = new byte[4096];
    ByteBuffer tmp = ByteBuffer.allocate(4096);
    int readResult = 0;

    //                    globally in some fashionable manner
    RandomAccessFile raf = new RandomAccessFile(mFile, "r");
    FileChannel channel = raf.getChannel();
    Iterator<OnDatatransferProgressListener> it = null;
    long transferred = 0;
    long size = mFile.length();
    if (size == 0)
        size = -1;/*from ww  w  . j  a va2  s  .co  m*/
    try {
        while ((readResult = channel.read(tmp)) >= 0) {
            out.write(tmp.array(), 0, readResult);
            tmp.clear();
            transferred += readResult;
            synchronized (mDataTransferListeners) {
                it = mDataTransferListeners.iterator();
                while (it.hasNext()) {
                    it.next().onTransferProgress(readResult, transferred, size, mFile.getAbsolutePath());
                }
            }
        }

    } catch (IOException io) {
        Log_OC.e("FileRequestException", io.getMessage());
        throw new RuntimeException(
                "Ugly solution to workaround the default policy of retries when the server falls while uploading ; temporal fix; really",
                io);

    } finally {
        channel.close();
        raf.close();
    }
}

From source file:com.cerema.cloud2.lib.common.network.FileRequestEntity.java

@Override
public void writeRequest(final OutputStream out) throws IOException {
    //byte[] tmp = new byte[4096];
    ByteBuffer tmp = ByteBuffer.allocate(4096);
    int readResult = 0;

    // TODO(bprzybylski): each mem allocation can throw OutOfMemoryError we need to handle it
    //                    globally in some fashionable manner
    RandomAccessFile raf = new RandomAccessFile(mFile, "r");
    FileChannel channel = raf.getChannel();
    Iterator<OnDatatransferProgressListener> it = null;
    long transferred = 0;
    long size = mFile.length();
    if (size == 0)
        size = -1;//  w w w .  ja v a  2s.  c  om
    try {
        while ((readResult = channel.read(tmp)) >= 0) {
            out.write(tmp.array(), 0, readResult);
            tmp.clear();
            transferred += readResult;
            synchronized (mDataTransferListeners) {
                it = mDataTransferListeners.iterator();
                while (it.hasNext()) {
                    it.next().onTransferProgress(readResult, transferred, size, mFile.getAbsolutePath());
                }
            }
        }

    } catch (IOException io) {
        Log_OC.e("FileRequestException", io.getMessage());
        throw new RuntimeException(
                "Ugly solution to workaround the default policy of retries when the server falls while uploading ; temporal fix; really",
                io);

    } finally {
        channel.close();
        raf.close();
    }
}

From source file:org.alfresco.patch.PatchServiceImpl.java

@Override
public PatchDocument getPatch(String nodeId, long nodeVersion) throws IOException {
    if (contentStore.exists(nodeId, nodeVersion - 1, true)) {
        // previous version
        NodeChecksums nodeChecksums = checksumService.getChecksums(nodeId, nodeVersion - 1);
        if (nodeChecksums != null) {
            // parameters version
            NodeInfo nodeInfo1 = contentDAO.getByNodeId(nodeId, nodeVersion, true);
            String contentPath1 = nodeInfo1.getContentPath();
            FileChannel inChannel = contentStore.getChannel(contentPath1);
            ByteBuffer buffer = ByteBuffer.allocate(1024 * 100);
            inChannel.read(buffer);
            buffer.flip();//from   w ww.  j a  v a  2s.  c  o m

            PatchDocument patchDocument = checksumService.createPatchDocument(nodeChecksums, buffer);
            return patchDocument;
        } else {
            throw new RuntimeException("No patches available, no checksums for node " + nodeId
                    + ", nodeVersion " + (nodeVersion - 1));
        }
    } else {
        throw new RuntimeException("No patches available, only a single version of the node");
    }
}

From source file:voldemort.store.cachestore.voldeimpl.StoreIterator.java

private boolean checkSignature(FileChannel channel) throws IOException {
    ByteBuffer intBytes = ByteBuffer.allocate(OFFSET);
    if (channel.size() == 0) {
        throw new StoreException("File size is 0");
    } else {/*from w  ww .j a  v a 2  s.c  o  m*/
        channel.read(intBytes);
        intBytes.rewind();
        if (intBytes.getInt() != MAGIC)
            throw new StoreException("Header mismatch expect " + MAGIC + " read " + intBytes.getInt());
    }
    return true;
}

From source file:net.librec.data.convertor.appender.SocialDataAppender.java

/**
 * Read data from the data file. Note that we didn't take care of the
 * duplicated lines./*from ww  w  .  ja v a2 s.  c  om*/
 *
 * @param inputDataPath
 *            the path of the data file
 * @throws IOException if I/O error occurs during reading
 */
private void readData(String inputDataPath) throws IOException {
    // Table {row-id, col-id, rate}
    Table<Integer, Integer, Double> dataTable = HashBasedTable.create();
    // Map {col-id, multiple row-id}: used to fast build a rating matrix
    Multimap<Integer, Integer> colMap = HashMultimap.create();
    // BiMap {raw id, inner id} userIds, itemIds
    final List<File> files = new ArrayList<File>();
    final ArrayList<Long> fileSizeList = new ArrayList<Long>();
    SimpleFileVisitor<Path> finder = new SimpleFileVisitor<Path>() {
        @Override
        public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
            fileSizeList.add(file.toFile().length());
            files.add(file.toFile());
            return super.visitFile(file, attrs);
        }
    };
    Files.walkFileTree(Paths.get(inputDataPath), finder);
    long allFileSize = 0;
    for (Long everyFileSize : fileSizeList) {
        allFileSize = allFileSize + everyFileSize.longValue();
    }
    // loop every dataFile collecting from walkFileTree
    for (File dataFile : files) {
        FileInputStream fis = new FileInputStream(dataFile);
        FileChannel fileRead = fis.getChannel();
        ByteBuffer buffer = ByteBuffer.allocate(BSIZE);
        int len;
        String bufferLine = new String();
        byte[] bytes = new byte[BSIZE];
        while ((len = fileRead.read(buffer)) != -1) {
            buffer.flip();
            buffer.get(bytes, 0, len);
            bufferLine = bufferLine.concat(new String(bytes, 0, len)).replaceAll("\r", "\n");
            String[] bufferData = bufferLine.split("(\n)+");
            boolean isComplete = bufferLine.endsWith("\n");
            int loopLength = isComplete ? bufferData.length : bufferData.length - 1;
            for (int i = 0; i < loopLength; i++) {
                String line = new String(bufferData[i]);
                String[] data = line.trim().split("[ \t,]+");
                String userA = data[0];
                String userB = data[1];
                Double rate = (data.length >= 3) ? Double.valueOf(data[2]) : 1.0;
                if (userIds.containsKey(userA) && userIds.containsKey(userB)) {
                    int row = userIds.get(userA);
                    int col = userIds.get(userB);
                    dataTable.put(row, col, rate);
                    colMap.put(col, row);
                }
            }
            if (!isComplete) {
                bufferLine = bufferData[bufferData.length - 1];
            }
            buffer.clear();
        }
        fileRead.close();
        fis.close();
    }
    int numRows = userIds.size(), numCols = userIds.size();
    // build rating matrix
    userSocialMatrix = new SparseMatrix(numRows, numCols, dataTable, colMap);
    // release memory of data table
    dataTable = null;
}

From source file:com.sm.store.utils.FileStore.java

private boolean checkSignature(FileChannel channel) throws IOException {
    ByteBuffer intBytes = ByteBuffer.allocate(OFFSET);
    if (channel.size() == 0) {
        intBytes.putInt(MAGIC);/*w ww .  j a v  a2 s.c o m*/
        intBytes.flip();
        channel.write(intBytes);
        return true;
    } else {
        channel.read(intBytes);
        intBytes.rewind();
        if (intBytes.getInt() != MAGIC)
            throw new StoreException("Header mismatch expect " + MAGIC + " read " + intBytes.getInt());
    }
    return true;
}

From source file:org.zuinnote.hadoop.office.format.common.parser.msexcel.internal.EncryptedCachedDiskStringsTable.java

/**
 * /* w ww  .  ja  va2  s  .  co  m*/
 * Gets a String from cache or underlying encrypted/compressed file
 * 
 * @param index
 * @return
 * @throws IOException
 */

private String getString(int index) throws IOException {
    // check if it is in cache?
    if (this.cache.containsKey(index)) {
        return this.cache.get(index);
    }
    // if not we have to read it from the file
    long itemPosition = this.stringPositionInFileList.get(index);
    String result = null;
    if (this.tempRAF == null) {
        this.accessTempFile(itemPosition);
        byte[] readSize = new byte[4];
        this.in.read(readSize);
        int sizeOfString = ByteBuffer.wrap(readSize).getInt();
        byte[] strbytes = new byte[sizeOfString];
        this.in.read(strbytes);
        this.currentPos += readSize.length + strbytes.length;
        result = new String(strbytes, EncryptedCachedDiskStringsTable.encoding);
    } else {
        FileChannel fc = this.tempRAF.getChannel().position(itemPosition);
        ByteBuffer bb = ByteBuffer.allocate(4);
        // read size of String
        fc.read(bb);
        bb.flip();
        int sizeOfStr = bb.getInt();
        // read string
        bb = ByteBuffer.allocate(sizeOfStr);
        fc.read(bb);
        bb.flip();
        result = new String(bb.array(), EncryptedCachedDiskStringsTable.encoding);
    }
    if (this.cacheSize != 0) {
        this.cache.put(index, result);
    }
    return result;
}

From source file:org.wso2.msf4j.internal.entitywriter.FileEntityWriter.java

/**
 * Write the entity to the carbon message.
 *///from  w ww .  j a va  2s. c  o m
@Override
public void writeData(CarbonMessage carbonMessage, File file, String mediaType, int chunkSize,
        CarbonCallback cb) {
    if (mediaType == null || mediaType.equals(MediaType.WILDCARD)) {
        try {
            mediaType = MimeMapper.getMimeType(FilenameUtils.getExtension(file.getName()));
        } catch (MimeMappingException e) {
            mediaType = MediaType.WILDCARD;
        }
    }
    try {
        FileChannel fileChannel = new FileInputStream(file).getChannel();
        if (chunkSize == Response.NO_CHUNK || chunkSize == Response.DEFAULT_CHUNK_SIZE) {
            chunkSize = DEFAULT_CHUNK_SIZE;
        }
        carbonMessage.setHeader(Constants.HTTP_TRANSFER_ENCODING, CHUNKED);
        carbonMessage.setHeader(Constants.HTTP_CONTENT_TYPE, mediaType);
        carbonMessage.setBufferContent(false);
        cb.done(carbonMessage);

        ByteBuffer buffer = ByteBuffer.allocate(chunkSize);
        while (fileChannel.read(buffer) != -1) {
            buffer.flip();
            carbonMessage.addMessageBody(buffer);
        }
        fileChannel.close();
        carbonMessage.setEndOfMsgAdded(true);
    } catch (IOException e) {
        throw new RuntimeException("Error occurred while reading from file", e);
    }
}