Example usage for java.io RandomAccessFile length

Introduction

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

Prototype

public native long length() throws IOException;

Source Link

Document

Returns the length of this file.

Usage

From source file:org.nuxeo.ecm.core.blob.binary.LocalBinaryManager.java

/**
 * Sets the last modification date to now on a file
 *
 * @param file the file//  w  ww.j  a  va  2 s.  c om
 */
public static void touch(File file) {
    long time = System.currentTimeMillis();
    if (file.setLastModified(time)) {
        // ok
        return;
    }
    if (!file.canWrite()) {
        // cannot write -> stop won't be able to delete anyway
        return;
    }
    try {
        // Windows: the file may be open for reading
        // workaround found by Thomas Mueller, see JCR-2872
        RandomAccessFile r = new RandomAccessFile(file, "rw");
        try {
            r.setLength(r.length());
        } finally {
            r.close();
        }
    } catch (IOException e) {
        log.error("Cannot set last modified for file: " + file, e);
    }
}

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From source file:org.apache.hadoop.dfs.TestDatanodeBlockScanner.java

private static void truncateReplica(String blockName, int dnIndex) throws IOException {
    File baseDir = new File(System.getProperty("test.build.data"), "dfs/data");
    for (int i = dnIndex * 2; i < dnIndex * 2 + 2; i++) {
        File blockFile = new File(baseDir, "data" + (i + 1) + "/current/" + blockName);
        if (blockFile.exists()) {
            RandomAccessFile raFile = new RandomAccessFile(blockFile, "rw");
            raFile.setLength(raFile.length() - 1);
            raFile.close();/*from   w  w w . j  a  v  a2 s  . c  o m*/
            break;
        }
    }
}

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From source file:org.apache.hadoop.hdfs.TestDatanodeBlockScanner.java

/**
 * Change the length of a block at datanode dnIndex
 *///from   w w  w .ja  v a 2 s  . c  o m
static boolean changeReplicaLength(String blockName, int dnIndex, int lenDelta) throws IOException {
    File baseDir = new File(System.getProperty("test.build.data"), "dfs/data");
    for (int i = dnIndex * 2; i < dnIndex * 2 + 2; i++) {
        File blockFile = new File(baseDir, "data" + (i + 1) + "/current/" + blockName);
        if (blockFile.exists()) {
            RandomAccessFile raFile = new RandomAccessFile(blockFile, "rw");
            raFile.setLength(raFile.length() + lenDelta);
            raFile.close();
            return true;
        }
    }
    return false;
}

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From source file:net.sourceforge.doddle_owl.data.JpnWordNetDic.java

private static long getIndexFileSize(RandomAccessFile indexFile) {
    try {//  w w  w .j  av a2  s. c om
        return indexFile.length() / 10;
    } catch (IOException ioe) {
        ioe.printStackTrace();
    }
    return -1;
}

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From source file:be.roots.taconic.pricingguide.util.iTextUtil.java

public static byte[] embedFont(byte[] pdf, String fontFileName, String fontName)
        throws IOException, DocumentException {

    try (ByteArrayOutputStream baos = new ByteArrayOutputStream()) {
        // the font file
        RandomAccessFile raf = new RandomAccessFile(fontFileName, "r");
        byte fontfile[] = new byte[(int) raf.length()];
        raf.readFully(fontfile);/*from  w w w.j a  v a 2 s  .  com*/
        raf.close();
        // create a new stream for the font file
        PdfStream stream = new PdfStream(fontfile);
        stream.flateCompress();
        stream.put(PdfName.LENGTH1, new PdfNumber(fontfile.length));
        // create a reader object
        PdfReader reader = new PdfReader(pdf);
        int n = reader.getXrefSize();
        PdfObject object;
        PdfDictionary font;
        PdfStamper stamper = new PdfStamper(reader, baos);
        PdfName fontname = new PdfName(fontName);
        for (int i = 0; i < n; i++) {
            object = reader.getPdfObject(i);
            if (object == null || !object.isDictionary())
                continue;
            font = (PdfDictionary) object;
            if (PdfName.FONTDESCRIPTOR.equals(font.get(PdfName.TYPE1))
                    && fontname.equals(font.get(PdfName.FONTNAME))) {
                PdfIndirectObject objref = stamper.getWriter().addToBody(stream);
                font.put(PdfName.FONTFILE2, objref.getIndirectReference());
            }
        }
        stamper.close();
        reader.close();
        return baos.toByteArray();
    }
}

---

From source file:org.srlutils.Files.java

/**
 * wrapper for RandomAccessFile.read()//from   w w  w  . ja  v a  2 s.  co  m
 * read len bytes from filename at position, filling bites starting at offset
 * if multiple exceptions are encountered (eg due to close() failing) throws the first only
 * @param bites if null, allocate a new array and read all available bytes
 * @param len if negative, fill bites
 * @return the byte array and number of bytes read
 * @throws RuntimeException wrapping any exceptions
 */
public static ReadInfo readbytes(String filename, long position, byte[] bites, int offset, int len) {
    ReadInfo read = new ReadInfo();
    RandomAccessFile fid = null;
    RuntimeException rte = null;
    try {
        String mode = "r";
        // fixme:memleak -- looks like fid is leaked ...
        fid = new RandomAccessFile(filename, mode);
        if (bites == null) {
            long size = fid.length() - position;
            if (size + offset > Integer.MAX_VALUE)
                throw new Exception(String.format(
                        "attempt to read the entirity of file '%s', size %d, is too large", filename, len));
            len = (int) size;
            bites = new byte[len + offset];
        }
        if (len < 0)
            len = bites.length - offset;
        fid.seek(position);
        read.num = fid.read(bites, offset, len);
        read.bytes = bites;
        return read;
    } catch (Exception ex) {
        rte = rte(ex, "failed to read string from file: %s", filename);
        throw rte;
    } finally {
        if (rte == null)
            rteClose(fid);
        else
            tryClose(fid);
    }
}

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From source file:net.sourceforge.doddle_owl.data.JpnWordNetDic.java

private static long getIndexFpListSize() {
    RandomAccessFile indexFpListFile = null;
    indexFpListFile = jpnwnWordIndexFile;
    try {//from   w w  w . j  a v a2  s  .  co m
        return indexFpListFile.length() / 10;
    } catch (IOException ioe) {
        ioe.printStackTrace();
    }
    return -1;
}

---

From source file:com.googlecode.psiprobe.Utils.java

public static void sendFile(HttpServletRequest request, HttpServletResponse response, File file)
        throws IOException {
    OutputStream out = response.getOutputStream();
    RandomAccessFile raf = new RandomAccessFile(file, "r");
    try {/*w w  w  .  j a va2  s  . c om*/
        long fileSize = raf.length();
        long rangeStart = 0;
        long rangeFinish = fileSize - 1;

        // accept attempts to resume download (if any)
        String range = request.getHeader("Range");
        if (range != null && range.startsWith("bytes=")) {
            String pureRange = range.replaceAll("bytes=", "");
            int rangeSep = pureRange.indexOf("-");

            try {
                rangeStart = Long.parseLong(pureRange.substring(0, rangeSep));
                if (rangeStart > fileSize || rangeStart < 0) {
                    rangeStart = 0;
                }
            } catch (NumberFormatException e) {
                // ignore the exception, keep rangeStart unchanged
            }

            if (rangeSep < pureRange.length() - 1) {
                try {
                    rangeFinish = Long.parseLong(pureRange.substring(rangeSep + 1));
                    if (rangeFinish < 0 || rangeFinish >= fileSize) {
                        rangeFinish = fileSize - 1;
                    }
                } catch (NumberFormatException e) {
                    // ignore the exception
                }
            }
        }

        // set some headers
        response.setContentType("application/x-download");
        response.setHeader("Content-Disposition", "attachment; filename=" + file.getName());
        response.setHeader("Accept-Ranges", "bytes");
        response.setHeader("Content-Length", Long.toString(rangeFinish - rangeStart + 1));
        response.setHeader("Content-Range", "bytes " + rangeStart + "-" + rangeFinish + "/" + fileSize);

        // seek to the requested offset
        raf.seek(rangeStart);

        // send the file
        byte[] buffer = new byte[4096];

        long len;
        int totalRead = 0;
        boolean nomore = false;
        while (true) {
            len = raf.read(buffer);
            if (len > 0 && totalRead + len > rangeFinish - rangeStart + 1) {
                // read more then required?
                // adjust the length
                len = rangeFinish - rangeStart + 1 - totalRead;
                nomore = true;
            }

            if (len > 0) {
                out.write(buffer, 0, (int) len);
                totalRead += len;
                if (nomore) {
                    break;
                }
            } else {
                break;
            }
        }
    } finally {
        raf.close();
    }
}

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From source file:org.apache.jackrabbit.core.data.FileDataStore.java

/**
 * Set the last modified date of a file, if the file is writable.
 *
 * @param file the file//from   w  ww.  ja  v  a 2 s .  co m
 * @param time the new last modified date
 * @throws DataStoreException if the file is writable but modifying the date fails
 */
private static void setLastModified(File file, long time) throws DataStoreException {
    if (!file.setLastModified(time)) {
        if (!file.canWrite()) {
            // if we can't write to the file, so garbage collection will also not delete it
            // (read only files or file systems)
            return;
        }
        try {
            // workaround for Windows: if the file is already open for reading
            // (in this or another process), then setting the last modified date
            // doesn't work - see also JCR-2872
            RandomAccessFile r = new RandomAccessFile(file, "rw");
            try {
                r.setLength(r.length());
            } finally {
                r.close();
            }
        } catch (IOException e) {
            throw new DataStoreException("An IO Exception occurred while trying to set the last modified date: "
                    + file.getAbsolutePath(), e);
        }
    }
}

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From source file:com.sangupta.snowpack.SnowpackRecover.java

/**
 * Try and recover from a chunk./*from   w ww.j  a v  a2s  .  c  om*/
 * 
 * @param chunkID
 * @param chunkFile
 * @param metadataDB 
 * @return
 * @throws IOException 
 */
private static ChunkInfo recoverChunkInfo(final int chunkID, final File chunkFile,
        SnowpackMetadataDB metadataDB) throws IOException {
    // open the file for reading
    RandomAccessFile raf = new RandomAccessFile(chunkFile, "r");

    // read the length first
    int nameLength, length, terminator, headerLength, numFiles = 0;
    long offset;

    List<FlakeMetadata> metas = new ArrayList<FlakeMetadata>();

    try {
        while (raf.getFilePointer() < raf.length()) {
            offset = raf.getFilePointer();

            nameLength = raf.readInt();
            byte[] name = new byte[nameLength];
            raf.readFully(name);

            length = raf.readInt();
            raf.readLong();
            raf.skipBytes((int) length);

            terminator = raf.readByte();
            if (terminator != 0) {
                System.out.print(" invalid descriptor found...");
                return null;
            }

            headerLength = 4 + name.length + 4 + 8;

            numFiles++;

            metas.add(new FlakeMetadata(new String(name), nameLength, chunkID, offset, headerLength));
        }
    } finally {
        raf.close();
    }

    // all clear for recovery

    // save all metadata in new DB
    for (FlakeMetadata meta : metas) {
        metadataDB.save(meta);
    }

    // return chunk info
    ChunkInfo info = new ChunkInfo();
    info.chunkID = chunkID;
    info.numFiles = numFiles;
    info.writePointer = -1;

    return info;
}

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