Examples of java.nio.channels.FileChannel.transferTo()

java.nio.channels.FileChannel.transferTo()
Transfers data from the file to the given channel. It may be very efficient. By invoking this methid, it will read form the file and write into the writable channel. Note: no guarantee whether all bytes may be transfered.And it does not modify the position of the channel. @param position the non-negative position to begin @param count the non-negative bytes to be transferred @param target the target channel to write into @return the number of bytes that were transferred. @throws IllegalArgumentException If the parameters are not correct @throws NonReadableChannelException If this channel is not readable @throws NonWritableChannelException If the target channel is not writable @throws ClosedChannelException If either channel has already been closed @throws AsynchronousCloseException If either channel is closed by other threads during this operation @throws ClosedByInterruptException If the thread is interrupted during this operation @throws IOException If any I/O error occurs

      fail();
    } catch (ClosedChannelException expected) {
    }


    try {
      channel.transferTo(0, 10, new ByteBufferChannel(buffer("111")));
      fail();
    } catch (ClosedChannelException expected) {
    }


    executor.shutdown();

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      fail();
    } catch (NonReadableChannelException expected) {
    }


    try {
      channel.transferTo(0, 10, new ByteBufferChannel(buffer("111")));
      fail();
    } catch (NonReadableChannelException expected) {
    }


    try {

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  @Test
  public void testTransferToNegative() throws IOException {
    FileChannel channel = channel(regularFile(0), READ, WRITE);


    try {
      channel.transferTo(-1, 0, new ByteBufferChannel(10));
      fail();
    } catch (IllegalArgumentException expected) {
    }


    try {

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      fail();
    } catch (IllegalArgumentException expected) {
    }


    try {
      channel.transferTo(0, -1, new ByteBufferChannel(10));
      fail();
    } catch (IllegalArgumentException expected) {
    }
  }

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        try {
            sourceStream = new FileInputStream( file );
            FileChannel sourceChannel = sourceStream.getChannel();


            WritableByteChannel targetChannel = Channels.newChannel( targetStream );
            sourceChannel.transferTo( 0, sourceChannel.size(), targetChannel );


            sourceStream.close();
            file.delete();
        }
        catch( FileNotFoundException ex ) {

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            throw new IllegalArgumentException("Cannot load from file more than 2GB: " + file);
        LBuffer b = new LBuffer((int) fileSize);
        long pos = 0L;
        WritableChannelWrap ch = new WritableChannelWrap(b);
        while (pos < fileSize) {
            pos += fin.transferTo(0, fileSize, ch);
        }
        return b;
    }

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    FileChannel inputChannel = null;
    WritableByteChannel outputChannel = null;
    try {
      inputChannel = inputStream.getChannel();
      outputChannel = Channels.newChannel(outputStream);
      inputChannel.transferTo(0, inputChannel.size(), outputChannel);
      outputStream.finish();
    } catch (ClosedByInterruptException e) {
      // may occur if we're closing down
      LogLog.debug("Compression operation interrupted");
      return false;

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    FileChannel inputChannel = null;
    try {
      inputChannel = inputStream.getChannel();
      final WritableByteChannel outputChannel = Channels
          .newChannel(outputStream);
      inputChannel.transferTo(0, inputChannel.size(), outputChannel);
      // Original implementation
      // while (inputStream.available() > 0) {
      // int data = inputStream.read();
      // if (data == -1) {
      // break;

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        String messageFileName = getMessageFileName(emailID);
        String indexErrorFileName = getIndexErrorFileName(emailID);
        try {          
             in = new FileInputStream(messageFileName).getChannel();
             out = new FileOutputStream(indexErrorFileName).getChannel();
             in.transferTo( 0, in.size(), out);
            
        } catch (Exception e) {
            throw new MessageStoreException("failed to copy suspect message to noindex queue {src='"+messageFileName+"=',dest='"+indexErrorFileName+"'",logger);
        } finally {
             if (in != null) try { in.close(); } catch (Exception e) {};

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        String messageFileName = getMessageFileName(emailID);
        String indexErrorFileName = getIndexErrorFileName(emailID);
        try {          
             in = new FileInputStream(messageFileName).getChannel();
             out = new FileOutputStream(indexErrorFileName).getChannel();
             in.transferTo( 0, in.size(), out);
            
        } catch (Exception e) {
            throw new MessageStoreException("failed to copy suspect message to noindex queue {src='"+messageFileName+"=',dest='"+indexErrorFileName+"'",logger);
        } finally {
             if (in != null) try { in.close(); } catch (Exception e) {};

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