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

java.nio.channels.FileChannel.truncate()
Truncates the file underlying this channel to a given size.
Any bytes beyond the given size are removed from the file. If there are no bytes beyond the given size then the file contents are unmodified.

If the file position is currently greater than the given size, then it is set to be the given size.
@param size the maximum size of the underlying file @throws IllegalArgumentException the requested size is negative. @throws ClosedChannelException the channel is closed. @throws NonWritableChannelException the channel cannot be written. @throws IOException some other IO problem occured. @return this channel

        else
            value--;
        bb.position(pos);
        bb.put(value);
        bb.force();
        fc.truncate(len);
        fc.close();
        return value & 0xFF;
    }

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        File mf = b.getMetaFile();
        // Truncate a block file that has a corresponding metadata file
        if (f.exists() && f.length() != 0 && mf.exists()) {
          FileOutputStream s = new FileOutputStream(f);
          FileChannel channel = s.getChannel();
          channel.truncate(0);
          LOG.info("Truncated block file " + f.getAbsolutePath());
          return b.getBlockId();
        }
      }
    }

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            FileChannel channel = file.getChannel();
            int newsize = random.nextInt((int)channel.size()/2);
            System.out.println("Deliberately truncating file " + 
                               blocks[idx].getName() + 
                               " to size " + newsize + " bytes.");
            channel.truncate(newsize);
            file.close();
          } else {
            //
            // corrupt a few bytes of the metafile
            //

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        File mf = b.getMetaFile();
        // Truncate a block file that has a corresponding metadata file
        if (f.exists() && f.length() != 0 && mf.exists()) {
          FileOutputStream s = new FileOutputStream(f);
          FileChannel channel = s.getChannel();
          channel.truncate(0);
          LOG.info("Truncated block file " + f.getAbsolutePath());
          return b.getBlockId();
        }
      }
    }

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            FileChannel channel = file.getChannel();
            int newsize = random.nextInt((int)channel.size()/2);
            System.out.println("Deliberately truncating file " + 
                               blocks[idx].getName() + 
                               " to size " + newsize + " bytes.");
            channel.truncate(newsize);
            file.close();
          } else {
            //
            // corrupt a few bytes of the metafile
            //

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        } catch (IOException ioe) {
            throw new ResourceException.IOError(ioe);
        }


        try {
            if (flags.isTruncate()) fileChannel.truncate(0);
        } catch (IOException ioe) {
            // ignore; it's a pipe or fifo that can't be truncated (we only care about illegal seek).
            if (!ioe.getMessage().equals("Illegal seek")) throw new ResourceException.IOError(ioe);
        }

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            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));
        } else {
            fileChannel.truncate(newLength);
        }
        fileChannel.position(position);
    }


    /**

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  }


  private void write_data(ByteString bytes) throws IOException {
    FileChannel ch = file.getChannel();
    if (is_write_lock) {
      ch.truncate(0);
      ch.write(bytes.asReadOnlyByteBuffer(), 0);


      return;
    }

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        byte value = bb.get(pos);
        value--;
        bb.position(pos);
        bb.put(value);
        bb.force();
        fc.truncate(len);
        fc.close();
        return value & 0xFF;
    }
  
    /*

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        else
            value--;
        bb.position(pos);
        bb.put(value);
        bb.force();
        fc.truncate(len);
        fc.close();
        return value & 0xFF;
    }

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