Java Code Examples for java.io.FileInputStream#getChannel()

The following examples show how to use java.io.FileInputStream#getChannel() . These examples are extracted from open source projects. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example 1
/**
 * Moved this code into it's own method so moveTo could use it when the move is across file systems
 */
private void copyAction(File srcFile, File destFile)
        throws FileNotFoundException, IOException {
    FileInputStream istream = new FileInputStream(srcFile);
    FileOutputStream ostream = new FileOutputStream(destFile);
    FileChannel input = istream.getChannel();
    FileChannel output = ostream.getChannel();

    try {
        input.transferTo(0, input.size(), output);
    } finally {
        istream.close();
        ostream.close();
        input.close();
        output.close();
    }
}
 
Example 2
Source Project: xDrip   File: DatabaseUtil.java    License: GNU General Public License v3.0 6 votes vote down vote up
public static void loadSql(Context context, Uri uri) {
    try {
        final String databaseName = new Configuration.Builder(context).create().getDatabaseName();

        final File currentDB = context.getDatabasePath(databaseName);
        final File replacement = new File(uri.getPath());
        if (currentDB.canWrite()) {
            final FileInputStream srcStream = new FileInputStream(replacement);
            final FileChannel src = srcStream.getChannel();
            final FileOutputStream destStream = new FileOutputStream(currentDB);
            final FileChannel dst = destStream.getChannel();
            dst.transferFrom(src, 0, src.size());
            src.close();
            srcStream.close();
            dst.close();
            destStream.close();
        } else {
            throw new RuntimeException("Couldn't write to " + currentDB);
        }
    } catch (final Exception e) {
        throw new RuntimeException(e);
    }
}
 
Example 3
Source Project: Camdroid   File: StorageUtils.java    License: Apache License 2.0 6 votes vote down vote up
private static void copyAction(File srcFile, File destFile)
        throws FileNotFoundException, IOException {
    FileInputStream istream = new FileInputStream(srcFile);
    FileOutputStream ostream = new FileOutputStream(destFile);
    FileChannel input = istream.getChannel();
    FileChannel output = ostream.getChannel();

    try {
        input.transferTo(0, input.size(), output);
    } finally {
        istream.close();
        ostream.close();
        input.close();
        output.close();
    }
}
 
Example 4
Source Project: big-c   File: MappableBlock.java    License: Apache License 2.0 6 votes vote down vote up
/**
 * Load the block.
 *
 * mmap and mlock the block, and then verify its checksum.
 *
 * @param length         The current length of the block.
 * @param blockIn        The block input stream.  Should be positioned at the
 *                       start.  The caller must close this.
 * @param metaIn         The meta file input stream.  Should be positioned at
 *                       the start.  The caller must close this.
 * @param blockFileName  The block file name, for logging purposes.
 *
 * @return               The Mappable block.
 */
public static MappableBlock load(long length,
    FileInputStream blockIn, FileInputStream metaIn,
    String blockFileName) throws IOException {
  MappableBlock mappableBlock = null;
  MappedByteBuffer mmap = null;
  FileChannel blockChannel = null;
  try {
    blockChannel = blockIn.getChannel();
    if (blockChannel == null) {
      throw new IOException("Block InputStream has no FileChannel.");
    }
    mmap = blockChannel.map(MapMode.READ_ONLY, 0, length);
    NativeIO.POSIX.getCacheManipulator().mlock(blockFileName, mmap, length);
    verifyChecksum(length, metaIn, blockChannel, blockFileName);
    mappableBlock = new MappableBlock(mmap, length);
  } finally {
    IOUtils.closeQuietly(blockChannel);
    if (mappableBlock == null) {
      if (mmap != null) {
        NativeIO.POSIX.munmap(mmap); // unmapping also unlocks
      }
    }
  }
  return mappableBlock;
}
 
Example 5
Source Project: gemfirexd-oss   File: FileUtil.java    License: Apache License 2.0 6 votes vote down vote up
/**
 * Copy a single file using NIO.
 * @throws IOException
 */
private static void nioCopy(FileOutputStream fos, FileInputStream fis)
    throws IOException {
  FileChannel outChannel = fos.getChannel();
  FileChannel inChannel = fis.getChannel();
  long length = inChannel.size();
  long offset = 0;
  while(true) {
    long remaining = length - offset;
    
    long toTransfer = remaining < MAX_TRANSFER_SIZE ? remaining : MAX_TRANSFER_SIZE;
    long transferredBytes = inChannel.transferTo(offset, toTransfer, outChannel);
    offset += transferredBytes;
    length = inChannel.size();
    if(offset >= length) {
      break;
    }
  }
}
 
Example 6
Source Project: DataVec   File: ArrowConverter.java    License: Apache License 2.0 6 votes vote down vote up
/**
 * Read a datavec schema and record set
 * from the given arrow file.
 * @param input the input to read
 * @return the associated datavec schema and record
 */
public static Pair<Schema,ArrowWritableRecordBatch> readFromFile(FileInputStream input) throws IOException {
    BufferAllocator allocator = new RootAllocator(Long.MAX_VALUE);
    Schema retSchema = null;
    ArrowWritableRecordBatch ret = null;
    SeekableReadChannel channel = new SeekableReadChannel(input.getChannel());
    ArrowFileReader reader = new ArrowFileReader(channel, allocator);
    reader.loadNextBatch();
    retSchema = toDatavecSchema(reader.getVectorSchemaRoot().getSchema());
    //load the batch
    VectorUnloader unloader = new VectorUnloader(reader.getVectorSchemaRoot());
    VectorLoader vectorLoader = new VectorLoader(reader.getVectorSchemaRoot());
    ArrowRecordBatch recordBatch = unloader.getRecordBatch();

    vectorLoader.load(recordBatch);
    ret = asDataVecBatch(recordBatch,retSchema,reader.getVectorSchemaRoot());
    ret.setUnloader(unloader);

    return Pair.of(retSchema,ret);

}
 
Example 7
Source Project: reader   File: LocalFilesystem.java    License: MIT License 6 votes vote down vote up
/**
 * Moved this code into it's own method so moveTo could use it when the move is across file systems
 */
private void copyAction(File srcFile, File destFile)
        throws FileNotFoundException, IOException {
    FileInputStream istream = new FileInputStream(srcFile);
    FileOutputStream ostream = new FileOutputStream(destFile);
    FileChannel input = istream.getChannel();
    FileChannel output = ostream.getChannel();

    try {
        input.transferTo(0, input.size(), output);
    } finally {
        istream.close();
        ostream.close();
        input.close();
        output.close();
    }
}
 
Example 8
/** Memory-map the model file in Assets. */
private MappedByteBuffer loadModelFile(Activity activity) throws IOException {
    AssetFileDescriptor fileDescriptor = activity.getAssets().openFd(getModelPath());
    FileInputStream inputStream = new FileInputStream(fileDescriptor.getFileDescriptor());
    FileChannel fileChannel = inputStream.getChannel();
    long startOffset = fileDescriptor.getStartOffset();
    long declaredLength = fileDescriptor.getDeclaredLength();
    return fileChannel.map(FileChannel.MapMode.READ_ONLY, startOffset, declaredLength);
}
 
Example 9
Source Project: MyTv   File: FileUtils.java    License: Apache License 2.0 5 votes vote down vote up
/**
 * 以指定编码读入本地文件,以指定编码方式输出,NIO
 * 
 * @param filePath
 *            文件路径
 * @param inCharsetName
 *            编码名称,读入
 * @param outCharsetName
 *            编码名称,输出
 * @throws FileNotFoundException
 * @throws IOException
 * @return
 */
public static byte[] readWithNIO(String filePath, String inCharsetName,
		String outCharsetName) throws FileNotFoundException, IOException {
	if (filePath == null) {
		return null;
	}
	FileInputStream fis = new FileInputStream(new File(filePath));
	FileChannel fc = fis.getChannel();
	ByteBuffer byteBuffer = ByteBuffer.allocate(fis.available());
	ByteBuffer buffer = ByteBuffer.allocate(BUFFER_SIZE);

	while (true) {
		int count = fc.read(buffer);
		if (count == -1) {
			break;
		}
		buffer.flip();
		byteBuffer.put(buffer);
		buffer.clear();
	}
	fc.close();
	fis.close();
	byteBuffer.flip();
	Charset inCharset = Charset.forName(inCharsetName);
	Charset outCharset = Charset.forName(outCharsetName);
	CharsetDecoder decoder = inCharset.newDecoder();
	CharsetEncoder encoder = outCharset.newEncoder();
	CharBuffer charBuffer = decoder.decode(byteBuffer);
	ByteBuffer resultBuffer = encoder.encode(charBuffer);
	int size = resultBuffer.limit();
	byte[] data = new byte[size];
	resultBuffer.get(data, 0, size);
	return data;
}
 
Example 10
Source Project: dubbox   File: LogPageHandler.java    License: Apache License 2.0 5 votes vote down vote up
public Page handle(URL url) {
      long size = 0;
String content = "";
String modified = "Not exist";
if (file != null && file.exists()) {
	try {
		FileInputStream fis = new FileInputStream(file);
		FileChannel channel = fis.getChannel();
		size = channel.size();
		ByteBuffer bb;
		if (size <= SHOW_LOG_LENGTH) {
			bb = ByteBuffer.allocate((int) size);
			channel.read(bb, 0);
		} else {
			int pos = (int) (size - SHOW_LOG_LENGTH);
			bb = ByteBuffer.allocate(SHOW_LOG_LENGTH);
			channel.read(bb, pos);
		}
		bb.flip();
		content = new String(bb.array()).replace("<", "&lt;")
				.replace(">", "&gt;").replace("\n", "<br/><br/>");
		modified = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss")
				.format(new Date(file.lastModified()));
	} catch (IOException e) {
	}
}
Level level = LogManager.getRootLogger().getLevel();
      List<List<String>> rows = new ArrayList<List<String>>();
      List<String> row = new ArrayList<String>();
      row.add(content);
      rows.add(row);
      return new Page("Log", "Log",  new String[] {(file == null ? "" : file.getName()) + ", " + size + " bytes, " + modified + ", " + level}, rows);
  }
 
Example 11
Source Project: rapidoid   File: RapidoidConnection.java    License: Apache License 2.0 5 votes vote down vote up
@Override
public synchronized Channel write(File file) {
	try {
		FileInputStream stream = new FileInputStream(file);
		FileChannel fileChannel = stream.getChannel();
		output.append(fileChannel);
		stream.close();
	} catch (IOException e) {
		throw U.rte(e);
	}

	return this;
}
 
Example 12
Source Project: beam   File: LocalFileSystem.java    License: Apache License 2.0 5 votes vote down vote up
@Override
protected ReadableByteChannel open(LocalResourceId resourceId) throws IOException {
  LOG.debug("opening file {}", resourceId);
  @SuppressWarnings("resource") // The caller is responsible for closing the channel.
  FileInputStream inputStream = new FileInputStream(resourceId.getPath().toFile());
  // Use this method for creating the channel (rather than new FileChannel) so that we get
  // regular FileNotFoundException. Closing the underyling channel will close the inputStream.
  return inputStream.getChannel();
}
 
Example 13
Source Project: cos-java-sdk-v5   File: ResettableInputStream.java    License: MIT License 5 votes vote down vote up
/**
 * @param file can be null if not known
 */
private ResettableInputStream(FileInputStream fis, File file) throws IOException {
    super(fis);
    this.file = file;
    this.fis = fis;
    this.fileChannel = fis.getChannel();
    this.markPos = fileChannel.position();
}
 
Example 14
/**
 * @param file
 *            can be null if not known
 */
private ResettableInputStream(FileInputStream fis, File file) throws IOException {
    super(fis);
    this.file = file;
    this.fis = fis;
    this.fileChannel = fis.getChannel();
    this.markPos = fileChannel.position();
}
 
Example 15
Source Project: joyqueue   File: Files.java    License: Apache License 2.0 5 votes vote down vote up
/**
 * 从文件流里面拷贝数据
 *
 * @param in     输入流
 * @param out    输出流
 * @param start  输入位置
 * @param length 长度
 * @throws IOException
 */
protected static void copy(final FileInputStream in, final FileOutputStream out, final long start,
        final long length) throws IOException {
    if (in == null || out == null) {
        return;
    }
    FileChannel fci = in.getChannel();
    FileChannel fco = out.getChannel();
    try {
        fci.transferTo(start, length, fco);
        fco.force(false);
    } finally {
        Close.close(fci).close(fco);
    }
}
 
Example 16
public void testStream() throws FileNotFoundException, IOException {
	File f = File.createTempFile( ByteBufferInputStreamTest.class.getName(), "tmp" );
	f.deleteOnExit();
	final int l = 100000;
	long seed = System.currentTimeMillis();
	if ( DEBUG ) System.err.println( "Seed: " + seed );
	Random random = new Random( seed );

	for( int n = 1; n < 4; n++ ) {
		final FileOutputStream fos = new FileOutputStream( f );
		for( int i = 0; i < l * n; i++ ) fos.write( random.nextInt() & 0xFF );
		fos.close();

		ByteBufferInputStream bis = ByteBufferInputStream.map( new FileInputStream( f ).getChannel(), MapMode.READ_ONLY );

		FileInputStream test = new FileInputStream( f );
		FileChannel fc = test.getChannel();
		int a1, a2, off, len, pos;
		byte b1[] = new byte[ 32768 ];
		byte b2[] = new byte[ 32768 ];

		for( int k = 0; k < l / 10; k++ ) {

			switch ( random.nextInt( 6 ) ) {

			case 0:
				if ( DEBUG ) System.err.println( "read()" );
				a1 = bis.read();
				a2 = test.read();
				assertEquals( a2, a1 );
				break;

			case 1:
				off = random.nextInt( b1.length );
				len = random.nextInt( b1.length - off + 1 );
				a1 = bis.read( b1, off, len );
				a2 = test.read( b2, off, len );
				if ( DEBUG ) System.err.println( "read(b, " + off + ", " + len + ")" );

				assertEquals( a2, a1 );

				for ( int i = off; i < off + len; i++ )
					assertEquals( b2[ i ], b1[ i ] );
				break;

			case 2:
				if ( DEBUG ) System.err.println( "available()" );
				assertEquals( test.available(), bis.available() );
				break;

			case 3:
				pos = (int)bis.position();
				if ( DEBUG ) System.err.println( "position()=" + pos );
				assertEquals( (int)fc.position(), pos );
				break;

			case 4:
				pos = random.nextInt( l * n );
				bis.position( pos );
				if ( DEBUG ) System.err.println( "position(" + pos + ")" );
				( test = new FileInputStream( f ) ).skip( pos );
				fc = test.getChannel();
				break;

			case 5:
				pos = random.nextInt( (int)( l * n - bis.position() + 1 ) );
				if ( DEBUG ) System.err.println( "skip(" + pos + ")" );
				a1 = (int)bis.skip( pos );
				a2 = (int)test.skip( pos );
				assertEquals( a2, a1 );
				break;
			}
		}
		
		test.close();
	}
}
 
Example 17
Source Project: gemfirexd-oss   File: GFSnapshot.java    License: Apache License 2.0 4 votes vote down vote up
public GFSnapshotImporter(File in) throws IOException, ClassNotFoundException {
  pdx = new ExportedRegistry();

  // read header and pdx registry
  long entryPosition;
  
  FileInputStream fis = new FileInputStream(in);
  FileChannel fc = fis.getChannel();
  DataInputStream tmp = new DataInputStream(fis);
  try {
    // read the snapshot file header
    version = tmp.readByte();
    if (version == SNAP_VER_1) {
      throw new IOException(LocalizedStrings.Snapshot_UNSUPPORTED_SNAPSHOT_VERSION_0.toLocalizedString(SNAP_VER_1) + ": " + in);
      
    } else if (version == SNAP_VER_2) {
      // read format
      byte[] format = new byte[3];
      tmp.readFully(format);
      if (!Arrays.equals(format, SNAP_FMT)) {
        throw new IOException(LocalizedStrings.Snapshot_UNRECOGNIZED_FILE_TYPE_0.toLocalizedString(Arrays.toString(format)) + ": " + in);
      }
      
      // read pdx location
      long registryPosition = tmp.readLong();
      
      // read region
      region = tmp.readUTF();
      entryPosition = fc.position();
      
      // read pdx
      if (registryPosition != -1) {
        fc.position(registryPosition);
        pdx.fromData(tmp);
      }
    } else {
      throw new IOException(LocalizedStrings.Snapshot_UNRECOGNIZED_FILE_VERSION_0.toLocalizedString(version) + ": " + in);
    }
  } finally {
    tmp.close();
  }
  
  // check compatibility with the existing pdx types so we don't have to 
  // do any translation...preexisting types or concurrent put ops may cause
  // this check to fail
  checkPdxTypeCompatibility();
  checkPdxEnumCompatibility();
  
  // open new stream with buffering for reading entries
  dis = new DataInputStream(new BufferedInputStream(new FileInputStream(in)));
  dis.skip(entryPosition);
}
 
Example 18
@Test
public void T_convert_1() throws IOException{
  byte[] mdsFile = createTestData();
  InputStream in = new ByteArrayInputStream( mdsFile );
  MDSReader reader = new MDSReader();
  Configuration config = new Configuration();
  reader.setNewStream( in , mdsFile.length , config );
  MDSArrowReader arrowReader = new MDSArrowReader( reader , config );
  File testFile = new File( "target/TestConvertArrowFormatTool_T_convert_1.mds" );
  if( testFile.exists() ){
    testFile.delete();
  }
  FileOutputStream out = new FileOutputStream( testFile );
  ConvertArrowFormatTool.convert( arrowReader , out , config );

  FileInputStream arrowIn = new FileInputStream( testFile ); 
  ArrowFileReader ar = new ArrowFileReader( arrowIn.getChannel() , new RootAllocator( Integer.MAX_VALUE ) );
  VectorSchemaRoot root  = ar.getVectorSchemaRoot();
  ArrowBlock rbBlock = ar.getRecordBlocks().get(0);
  ar.loadRecordBatch(rbBlock);
  List<FieldVector> fieldVectorList = root.getFieldVectors();
  Map<String,FieldVector> vectorMap = new HashMap<String,FieldVector>();
  for( FieldVector v : fieldVectorList ){
    vectorMap.put( v.getField().getName() , v );
  }

  assertTrue( vectorMap.containsKey( "col1" ) );
  assertTrue( vectorMap.containsKey( "col2" ) );
  assertTrue( vectorMap.containsKey( "col3" ) );

  BigIntVector col1 = (BigIntVector)( vectorMap.get( "col1" ) );
  VarCharVector col2 = (VarCharVector)( vectorMap.get( "col2" ) );
  VarCharVector col3 = (VarCharVector)( vectorMap.get( "col3" ) );


  assertEquals( col1.get(0) , 100L );
  assertEquals( col1.get(1) , 200L );
  assertEquals( col1.get(2) , 300L );

  assertEquals( col2.getObject(0).toString() , "aaa" );
  assertTrue( col2.isNull(1) );
  assertTrue( col2.isNull(2) );

  assertTrue( col3.isNull(0) );
  assertEquals( col3.getObject(1).toString() , "BBB" );
  assertEquals( col3.getObject(2).toString() , "CCC" );

  testFile.delete();
  ar.close();
}
 
Example 19
@Test
public void testFileChannel() throws Exception {
    File source = File.createTempFile("source", null);
    source.deleteOnExit();
    File sink = File.createTempFile("sink", null);
    sink.deleteOnExit();

    FileOutputStream fos = new FileOutputStream(source);
    FileChannel sourceChannel = fos.getChannel();
    sourceChannel.write(ByteBuffer.wrap(
        "Use the source, Luke!".getBytes()));
    sourceChannel.close();

    FileInputStream fis = new FileInputStream(source);
    sourceChannel = fis.getChannel();

    RandomAccessFile raf = new RandomAccessFile(sink, "rw");
    FileChannel sinkChannel = raf.getChannel();
    long oldSinkPosition = sinkChannel.position();
    long oldSourcePosition = sourceChannel.position();

    long bytesWritten = sinkChannel.transferFrom(sourceChannel, 0, 10);
    if (bytesWritten != 10)
        throw new RuntimeException("Transfer failed");

    if (sourceChannel.position() == oldSourcePosition)
        throw new RuntimeException("Source position didn't change");

    if (sinkChannel.position() != oldSinkPosition)
        throw new RuntimeException("Sink position changed");

    if (sinkChannel.size() != 10)
        throw new RuntimeException("Unexpected sink size");

    bytesWritten = sinkChannel.transferFrom(sourceChannel, 1000, 10);

    if (bytesWritten > 0)
        throw new RuntimeException("Wrote past file size");

    sourceChannel.close();
    sinkChannel.close();

    source.delete();
    sink.delete();
}
 
Example 20
Source Project: KJFrameForAndroid   File: FileUtils.java    License: Apache License 2.0 3 votes vote down vote up
/**
 * 快速复制文件(采用nio操作)
 * 
 * @param is
 *            数据来源
 * @param os
 *            数据目标
 * @throws IOException
 */
public static void copyFileFast(FileInputStream is, FileOutputStream os)
        throws IOException {
    FileChannel in = is.getChannel();
    FileChannel out = os.getChannel();
    in.transferTo(0, in.size(), out);
}