Example usage for java.io RandomAccessFile length

List of usage examples for java.io RandomAccessFile length

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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.apache.cordova.core.FileUtils.java

/**
 * Truncate the file to size/*from  w  w  w . ja  v a  2 s .  c o  m*/
 *
 * @param filename
 * @param size
 * @throws FileNotFoundException, IOException
 * @throws NoModificationAllowedException
 */
private long truncateFile(String filename, long size)
        throws FileNotFoundException, IOException, NoModificationAllowedException {
    if (filename.startsWith("content://")) {
        throw new NoModificationAllowedException("Couldn't truncate file given its content URI");
    }

    filename = FileHelper.getRealPath(filename, cordova);

    RandomAccessFile raf = new RandomAccessFile(filename, "rw");
    try {
        if (raf.length() >= size) {
            FileChannel channel = raf.getChannel();
            channel.truncate(size);
            return size;
        }

        return raf.length();
    } finally {
        raf.close();
    }
}

From source file:caesar.feng.framework.utils.ACache.java

/**
 * ? byte ?//from w  ww  . j a  v  a 2 s . co  m
 * 
 * @param key
 * @return byte ?
 */
public byte[] getAsBinary(String key) {
    RandomAccessFile RAFile = null;
    boolean removeFile = false;
    try {
        File file = mCache.get(key);
        if (!file.exists())
            return null;
        RAFile = new RandomAccessFile(file, "r");
        byte[] byteArray = new byte[(int) RAFile.length()];
        RAFile.read(byteArray);
        if (!Utils.isDue(byteArray)) {
            return Utils.clearDateInfo(byteArray);
        } else {
            removeFile = true;
            return null;
        }
    } catch (Exception e) {
        e.printStackTrace();
        return null;
    } finally {
        if (RAFile != null) {
            try {
                RAFile.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        if (removeFile)
            remove(key);
    }
}

From source file:com.siblinks.ws.service.impl.CommentServiceImpl.java

/**
 * {@inheritDoc}//from  w  w w .  j  av a 2s .  c  o  m
 */
@Override
@RequestMapping(value = "/getImageComment/{name}", method = RequestMethod.GET)
public ResponseEntity<byte[]> getImageComment(@PathVariable(value = "name") final String name) {
    ResponseEntity<byte[]> responseEntity = null;
    RandomAccessFile randomAccessFile = null;
    try {
        if (name != null) {
            String directory = environment.getProperty("directoryImageComment");
            String path = directory + "/" + name + ".png";

            randomAccessFile = new RandomAccessFile(path, "r");
            byte[] r = new byte[(int) randomAccessFile.length()];
            randomAccessFile.readFully(r);
            responseEntity = new ResponseEntity<byte[]>(r, new HttpHeaders(), HttpStatus.OK);
        } else {
            responseEntity = new ResponseEntity<byte[]>(HttpStatus.NO_CONTENT);
        }
    } catch (Exception e) {
        e.printStackTrace();
        logger.error(e.getMessage());
    } finally {
        try {
            if (randomAccessFile != null) {
                randomAccessFile.close();
            }
        } catch (IOException e) {
            // Do nothing
        }
    }
    return responseEntity;

}

From source file:com.siblinks.ws.service.impl.CommentServiceImpl.java

/**
 * This method to get image from path directory Image question
 *
 * @param image//from w w  w  .  j a  v a  2s  . c  o  m
 *            name
 *
 */
@Override
@RequestMapping(value = "/getImageQuestion/{name}", method = RequestMethod.GET)
public ResponseEntity<byte[]> getImageQuestion(@PathVariable(value = "name") final String name) {
    RandomAccessFile t = null;
    ResponseEntity<byte[]> responseEntity = null;
    try {
        if (name != null) {
            String directory = environment.getProperty("directoryImageQuestion");

            String path = directory + "/" + name + ".png";

            t = new RandomAccessFile(path, "r");
            byte[] r = new byte[(int) t.length()];
            t.readFully(r);
            responseEntity = new ResponseEntity<byte[]>(r, new HttpHeaders(), HttpStatus.OK);
        } else {
            responseEntity = new ResponseEntity<byte[]>(HttpStatus.NO_CONTENT);
        }
    } catch (Exception e) {
        e.printStackTrace();
        logger.error(e.getMessage());
    } finally {
        try {
            if (t != null) {
                t.close();
            }
        } catch (IOException e) {
            // do nothing
        }
    }
    return responseEntity;
}

From source file:hotbeans.support.FileSystemHotBeanModuleRepository.java

/**
 * Obtains a file lock on the repository lock file.
 *//*from   w  w  w.  j a v a2s.c o m*/
protected RepositoryFileLock obtainRepositoryFileLock(final boolean shared, final int timeout)
        throws IOException {
    Log logger = this.getLog();

    if (logger.isDebugEnabled())
        logger.debug("Obtaining repository file lock (shared: " + shared + ").");

    RepositoryFileLock repositoryFileLock = null;
    FileLock lock = null;
    final long beginWait = System.currentTimeMillis();

    while (repositoryFileLock == null) {
        try {
            RandomAccessFile lockFile = new RandomAccessFile(
                    new File(moduleRepositoryDirectory, LOCK_FILE_NAME), "rws");
            FileChannel channel = lockFile.getChannel();

            // Attempt to obtain a lock on the file
            lock = channel.tryLock(0L, Long.MAX_VALUE, shared);
            if (!shared && (lockFile.length() == 0)) {
                lockFile.write(new String("LOCK").getBytes());
                lockFile.getFD().sync();
            }
            repositoryFileLock = new RepositoryFileLock(lockFile, lock);
        } catch (IOException ioe) {
            if (logger.isDebugEnabled())
                logger.debug("Error obtaining repository file lock (shared: " + shared + ").", ioe);
            if (timeout < 0)
                throw ioe;
        } catch (OverlappingFileLockException ofle) {
            if (logger.isDebugEnabled())
                logger.debug("Error obtaining repository file lock (shared: " + shared + ").", ofle);
            if (timeout < 0)
                throw ofle;
        }

        if (repositoryFileLock == null) // This statement shouldn't be reaced if timeout is < 0
        {
            if ((System.currentTimeMillis() - beginWait) > timeout) // Wait a maximum of timeout milliseconds on lock
            {
                throw new IOException("Timeout while waiting for file lock on repository lock file!");
            } else {
                // Otherwise - wait a while before trying to obtain a lock again
                try {
                    Thread.sleep(Math.min(250, timeout - (System.currentTimeMillis() - beginWait)));
                } catch (InterruptedException ie) {
                }
            }
        }
    }

    if (logger.isDebugEnabled())
        logger.debug("Repository file lock (shared: " + shared + ") obtained.");

    return repositoryFileLock;
}

From source file:com.guodong.sun.guodong.uitls.CacheUtil.java

/**
 * ? byte ?//  w ww .jav  a 2s. c  o  m
 *
 * @param key
 * @return byte ?
 */
public byte[] getAsBinary(String key) {
    RandomAccessFile raFile = null;
    boolean removeFile = false;
    try {
        File file = mCache.get(key);
        if (!file.exists())
            return null;
        raFile = new RandomAccessFile(file, "r");
        byte[] byteArray = new byte[(int) raFile.length()];
        raFile.read(byteArray);
        if (!Utils.isDue(byteArray)) {
            return Utils.clearDateInfo(byteArray);
        } else {
            removeFile = true;
            return null;
        }
    } catch (Exception e) {
        e.printStackTrace();
        return null;
    } finally {
        if (raFile != null) {
            try {
                raFile.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        if (removeFile)
            remove(key);
    }
}

From source file:com.android.volley.cache.ACache.java

/**
 * ? byte ?//from  w  w  w .j  a  v a 2 s  . c o  m
 * 
 * @param key
 * @return byte ?
 */
//   public byte[] getAsBinary(String key) {
public BinaryShell getAsBinary(String key) {
    RandomAccessFile RAFile = null;
    //      boolean removeFile = false;
    try {
        File file = mCache.get(key);
        if (!file.exists())
            return null;
        RAFile = new RandomAccessFile(file, "r");
        byte[] byteArray = new byte[(int) RAFile.length()];
        RAFile.read(byteArray);

        BinaryShell shell = new BinaryShell();
        shell.content = Utils.clearDateInfo(byteArray);
        if (!Utils.isDue(byteArray)) {
            shell.outOfDate = false;
        } else {
            shell.outOfDate = true;
        }
        //         if (!Utils.isDue(byteArray)) {
        //            return Utils.clearDateInfo(byteArray);
        //         } else {
        //            removeFile = true;
        //            return null;
        //         }
        return shell;
    } catch (Exception e) {
        e.printStackTrace();
        return null;
    } finally {
        if (RAFile != null) {
            try {
                RAFile.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        //         if (removeFile)
        //            remove(key);
    }
}

From source file:au.org.ala.layers.dao.ObjectDAOImpl.java

@Override
public List<Objects> getObjectsById(String id, int start, int pageSize) {
    logger.info("Getting object info for fid = " + id);
    String limit_offset = " limit " + (pageSize < 0 ? "all" : pageSize) + " offset " + start;
    String sql = "select o.pid as pid, o.id as id, o.name as name, o.desc as description, "
            + "o.fid as fid, f.name as fieldname, o.bbox, o.area_km, "
            + "ST_AsText(ST_Centroid(o.the_geom)) as centroid,"
            + "GeometryType(o.the_geom) as featureType from objects o, fields f "
            + "where o.fid = ? and o.fid = f.id order by o.pid " + limit_offset;
    List<Objects> objects = jdbcTemplate.query(sql,
            ParameterizedBeanPropertyRowMapper.newInstance(Objects.class), id);

    updateObjectWms(objects);/*w ww  .  j a v  a 2  s .c o  m*/

    // get grid classes
    if (objects == null || objects.isEmpty()) {
        objects = new ArrayList<Objects>();
        IntersectionFile f = layerIntersectDao.getConfig().getIntersectionFile(id);
        if (f != null && f.getClasses() != null) {
            //shape position
            int pos = 0;

            for (Entry<Integer, GridClass> c : f.getClasses().entrySet()) {
                File file = new File(f.getFilePath() + File.separator + c.getKey() + ".wkt.index.dat");
                if (f.getType().equals("a") || !file.exists()) { // class pid
                    if (pageSize == -1 || (pos >= start && pos - start < pageSize)) {
                        Objects o = new Objects();
                        o.setPid(f.getLayerPid() + ":" + c.getKey());
                        o.setId(f.getLayerPid() + ":" + c.getKey());
                        o.setName(c.getValue().getName());
                        o.setFid(f.getFieldId());
                        o.setFieldname(f.getFieldName());
                        o.setBbox(c.getValue().getBbox());
                        o.setArea_km(c.getValue().getArea_km());
                        o.setWmsurl(getGridClassWms(f.getLayerName(), c.getValue()));
                        objects.add(o);
                    }
                    pos++;

                    if (pageSize != -1 && pos >= start + pageSize) {
                        break;
                    }
                } else { // polygon pid
                    RandomAccessFile raf = null;
                    try {
                        raf = new RandomAccessFile(file, "r");
                        long itemSize = (4 + 4 + 4 * 4 + 4);
                        long len = raf.length() / itemSize; // group

                        if (pageSize != -1 && pos + len < start) {
                            pos += len;
                        } else {
                            // number,
                            // character
                            // offset,
                            // minx,
                            // miny,
                            // maxx,
                            // maxy,
                            // area
                            // sq
                            // km
                            int i = 0;
                            if (pageSize != -1 && pos < start) {
                                //the first object requested is in this file, seek to the start
                                i = start - pos;
                                pos += i;
                                raf.seek(i * itemSize);
                            }
                            for (; i < len; i++) {
                                int n = raf.readInt();
                                /* int charoffset = */
                                raf.readInt();
                                float minx = raf.readFloat();
                                float miny = raf.readFloat();
                                float maxx = raf.readFloat();
                                float maxy = raf.readFloat();
                                float area = raf.readFloat();

                                if (pageSize == -1 || (pos >= start && pos - start < pageSize)) {
                                    Objects o = new Objects();
                                    o.setPid(f.getLayerPid() + ":" + c.getKey() + ":" + n);
                                    o.setId(f.getLayerPid() + ":" + c.getKey() + ":" + n);
                                    o.setName(c.getValue().getName());
                                    o.setFid(f.getFieldId());
                                    o.setFieldname(f.getFieldName());

                                    o.setBbox("POLYGON((" + minx + " " + miny + "," + minx + " " + maxy + ","
                                            + +maxx + " " + maxy + "," + +maxx + " " + miny + "," + +minx + " "
                                            + miny + "))");
                                    o.setArea_km(1.0 * area);

                                    o.setWmsurl(getGridPolygonWms(f.getLayerName(), n));

                                    objects.add(o);
                                }

                                pos++;

                                if (pageSize != -1 && pos >= start + pageSize) {
                                    break;
                                }
                            }
                        }
                    } catch (Exception e) {
                        logger.error(e.getMessage(), e);
                    } finally {
                        if (raf != null) {
                            try {
                                raf.close();
                            } catch (Exception e) {
                                logger.error(e.getMessage(), e);
                            }
                        }
                    }

                    if (pageSize != -1 && pos >= start + pageSize) {
                        break;
                    }
                }
            }
        }
    }
    return objects;
}

From source file:net.sf.ehcache.DiskStoreTest.java

/**
 * Tests how data is written to a random access file.
 * <p/>//from w  w  w  .  jav a2  s.  co  m
 * It makes sure that bytes are immediately written to disk after a write.
 */
public void testWriteToFile() throws IOException {
    // Create and set up file
    String dataFileName = "fileTest";
    RandomAccessFile file = getRandomAccessFile(dataFileName);

    //write data to the file
    byte[] buffer = new byte[1024];
    for (int i = 0; i < 100; i++) {
        file.write(buffer);
    }

    assertEquals(1024 * 100, file.length());

}

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

/**
 * Actually writes the ID3 tags out to the ID3V1 section of mp3 file.
 *///w  w  w . j  av a  2s . c o m
private int writeID3V1DataToDisk(RandomAccessFile file) {
    byte[] buffer = new byte[30];//max buffer length...drop/pickup vehicle

    //see if there are ID3 Tags in the file
    String tag = "";
    try {
        file.readFully(buffer, 0, 3);
        tag = new String(buffer, 0, 3);
    } catch (EOFException e) {
        return LimeXMLReplyCollection.RW_ERROR;
    } catch (IOException e) {
        return LimeXMLReplyCollection.RW_ERROR;
    }
    //We are sure this is an MP3 file.Otherwise this method would never
    //be called.
    if (!tag.equals("TAG")) {
        //Write the TAG
        try {
            byte[] tagBytes = "TAG".getBytes();//has to be len 3
            file.seek(file.length() - 128);//reset the file-pointer
            file.write(tagBytes, 0, 3);//write these three bytes into the File
        } catch (IOException ioe) {
            return LimeXMLReplyCollection.BAD_ID3;
        }
    }
    LOG.debug("about to start writing to file");
    boolean b;
    b = toFile(title_, 30, file, buffer);
    if (!b)
        return LimeXMLReplyCollection.FAILED_TITLE;
    b = toFile(artist_, 30, file, buffer);
    if (!b)
        return LimeXMLReplyCollection.FAILED_ARTIST;
    b = toFile(album_, 30, file, buffer);
    if (!b)
        return LimeXMLReplyCollection.FAILED_ALBUM;
    b = toFile(year_, 4, file, buffer);
    if (!b)
        return LimeXMLReplyCollection.FAILED_YEAR;
    //comment and track (a little bit tricky)
    b = toFile(comment_, 28, file, buffer);//28 bytes for comment
    if (!b)
        return LimeXMLReplyCollection.FAILED_COMMENT;

    byte trackByte = (byte) -1;//initialize
    try {
        if (track_ == null || track_.equals(""))
            trackByte = (byte) 0;
        else
            trackByte = Byte.parseByte(track_);
    } catch (NumberFormatException nfe) {
        return LimeXMLReplyCollection.FAILED_TRACK;
    }

    try {
        file.write(0);//separator b/w comment and track(track is optional)
        file.write(trackByte);
    } catch (IOException e) {
        return LimeXMLReplyCollection.FAILED_TRACK;
    }

    //genre
    byte genreByte = getGenreByte();
    try {
        file.write(genreByte);
    } catch (IOException e) {
        return LimeXMLReplyCollection.FAILED_GENRE;
    }
    //come this far means we are OK.
    return LimeXMLReplyCollection.NORMAL;

}