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.

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


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


            if (dataType == DataBuffer.TYPE_USHORT) {
                bb.order(ByteOrder.BIG_ENDIAN);
                bb.asShortBuffer().get((short[]) imageData.data);
            } else

View Full Code Here

     * eg. it should append or override any existing content.
     */
    private FileChannel prepareOutputFileChannel(File target) throws IOException {
        if (endpoint.getFileExist() == GenericFileExist.Append) {
            FileChannel out = new RandomAccessFile(target, "rw").getChannel();
            return out.position(out.size());
        }
        return new FileOutputStream(target).getChannel();
    }
}

View Full Code Here

            if (!parent.exists() && !parent.mkdirs()) { throw new FileNotFoundException("Unable to create directory: " + parent.getAbsolutePath()); }


            pToCreate.createNewFile();
            outStream = new FileOutputStream(pToCreate);
            final FileChannel fcout = outStream.getChannel();
            fcout.position(pLength);
            outStream.write(26); // Write EOF (not normally needed)
            fcout.force(true);
            LOGGER.debug("Creation of storage " + pToCreate.toString() + " sucessful.");
            return true;
        } catch (IOException e) {

View Full Code Here


        sizeDataOut.writeInt(0); // on == false
        sizeDataOut.writeInt(sizeToUse);
        sizeDataOut.writeInt(this.size[0]);
        sizeDataOut.writeInt(this.size[1]);
        sizeData.writeToChannel(fileChannel.position(offset));
        fileChannel.force(false);
    }


    /**
     * Deletes this Chunk. This simply marks the Chunk's on value to off.

View Full Code Here

        FileChannel fileChannel = persistentMap.getFileChannel();
        Bufferlo sizeData = new Bufferlo();
        DataOutputStream sizeDataOut = new DataOutputStream(sizeData.getOutputStream());


        sizeDataOut.writeInt(0); // on == false
        sizeData.writeToChannel(fileChannel.position(offset));
        fileChannel.force(false);
     }


    /**
     * Reads the chunk into memory.

View Full Code Here

        FileChannel fileChannel = persistentMap.getFileChannel();
        Bufferlo sizeData = new Bufferlo();
        DataInputStream dataIn = new DataInputStream(sizeData.getInputStream());


        // read the header
        int offset = (int)fileChannel.position();
        int bytesRequired = 16;
        int read = sizeData.readFromChannel(fileChannel, bytesRequired);
        if(read < 0) return null;
        else if(read < bytesRequired) throw new IOException("Insufficent bytes available");

View Full Code Here

        if(chunk.on) {
            chunk.readHeader();
        }


        // adjust the position to after this chunk
        fileChannel.position(offset + size[sizeToUse]);


        // success
        return chunk;
    }

View Full Code Here

        chunkDataOut.writeInt(keyBytesLength);
        chunkDataOut.writeInt(valueBytesLength);
        chunkData.append(keyBytes);
        chunkData.append(valueBytes);


        chunkData.writeToChannel(fileChannel.position(offset + 16));
        fileChannel.force(false);


        // turn the written data on
        on = true;
        chunkDataOut.writeInt(1); // on == true

View Full Code Here

        fileChannel.force(false);


        // turn the written data on
        on = true;
        chunkDataOut.writeInt(1); // on == true
        chunkData.writeToChannel(fileChannel.position(offset));
        fileChannel.force(false);


        // clean up stuff we don't need no more
        keyBytes = null;
        valueBytes = null;

View Full Code Here

        Bufferlo chunkAsBytes = new Bufferlo();
        DataInputStream dataIn = new DataInputStream(chunkAsBytes.getInputStream());


        // read the whole chunk
        int bytesRequired = size();
        int read = chunkAsBytes.readFromChannel(fileChannel.position(offset), bytesRequired);
        if(read < bytesRequired) throw new IOException("Expected " + bytesRequired + " but found " + read + " bytes");


        // skip the chunk header
        dataIn.readInt(); // on/off
        dataIn.readInt(); // size to use

View Full Code Here

0 1 2 3 4 5 6 7 8 9

TOP

All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.