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

java.nio.channels.FileChannel.position()
Answers the current value of the file position pointer. @return the current position as a positive integer number of bytes fromthe start of the file. @throws ClosedChannelException if the channel is already closed. @throws IOException if some other IO problem occurs.

                    break;
                case SEEK_CUR:
                    fileChannel.position(fileChannel.position() - adj + offset);
                    break;
                case SEEK_END:
                    fileChannel.position(fileChannel.size() + offset);
                    break;
                }
            } catch (IllegalArgumentException e) {
                throw new InvalidValueException();
            } catch (IOException ioe) {

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    private void resetForWrite() throws IOException {
        if (descriptor.isSeekable()) {
            FileChannel fileChannel = (FileChannel)descriptor.getChannel();
            if (buffer.hasRemaining()) { // we have read ahead, and need to back up
                fileChannel.position(fileChannel.position() - buffer.remaining());
            }
        }
        // FIXME: Clearing read buffer here...is this appropriate?
        buffer.clear();
        reading = false;

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    private void resetForWrite() throws IOException {
        if (descriptor.isSeekable()) {
            FileChannel fileChannel = (FileChannel)descriptor.getChannel();
            if (buffer.hasRemaining()) { // we have read ahead, and need to back up
                fileChannel.position(fileChannel.position() - buffer.remaining());
            }
        }
        // FIXME: Clearing read buffer here...is this appropriate?
        buffer.clear();
        reading = false;

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        }
        invalidateBuffer();
        FileChannel fileChannel = (FileChannel)ch;
        if (newLength > fileChannel.size()) {
            // truncate can't lengthen files, so we save position, seek/write, and go back
            long position = fileChannel.position();
            int difference = (int)(newLength - fileChannel.size());
            
            fileChannel.position(fileChannel.size());
            // FIXME: This worries me a bit, since it could allocate a lot with a large newLength
            fileChannel.write(ByteBuffer.allocate(difference));

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        if (newLength > fileChannel.size()) {
            // truncate can't lengthen files, so we save position, seek/write, and go back
            long position = fileChannel.position();
            int difference = (int)(newLength - fileChannel.size());
            
            fileChannel.position(fileChannel.size());
            // FIXME: This worries me a bit, since it could allocate a lot with a large newLength
            fileChannel.write(ByteBuffer.allocate(difference));
            fileChannel.position(position);
        } else {
            fileChannel.truncate(newLength);

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            int difference = (int)(newLength - fileChannel.size());
            
            fileChannel.position(fileChannel.size());
            // FIXME: This worries me a bit, since it could allocate a lot with a large newLength
            fileChannel.write(ByteBuffer.allocate(difference));
            fileChannel.position(position);
        } else {
            fileChannel.truncate(newLength);
        }        
    }

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        buffer.clear();
        if (reading) {
            buffer.flip();
            // if the read buffer is ahead, back up
            FileChannel fileChannel = (FileChannel)descriptor.getChannel();
            if (posOverrun != 0) fileChannel.position(fileChannel.position() - posOverrun);
        }
    }


    /**
     * Ensure close (especially flush) when we're finished with

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        buffer.clear();
        if (reading) {
            buffer.flip();
            // if the read buffer is ahead, back up
            FileChannel fileChannel = (FileChannel)descriptor.getChannel();
            if (posOverrun != 0) fileChannel.position(fileChannel.position() - posOverrun);
        }
    }


    /**
     * Ensure close (especially flush) when we're finished with

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        FileChannel f1 = (FileChannel)d1.getChannel();
        FileChannel f2 = (FileChannel)d2.getChannel();


        long size = f1.size();


        f1.transferTo(f2.position(), size, f2);


        return context.getRuntime().newFixnum(size);
    }
    
    /**

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            int totalData = width * height * bands * (dataType == DataBuffer.TYPE_BYTE ? 1 : 2);


            FileChannel c = s.getChannel();


            if (file.length() != totalData + c.position()) {
                c.close();
                throw new BadImageFileException(file);
            }


            ByteBuffer bb = c.map(FileChannel.MapMode.READ_ONLY, c.position(), totalData);

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