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

            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);
        }        
    }
    
    /**
     * Invalidate buffer before a position change has occurred (e.g. seek),

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            else
                args.put("latest_time", lastTime);
                addEndOfLine = true;


            FileChannel fc = raf.getChannel();
            fc.truncate(fptrEof);
        } else
        if (!file.createNewFile())
            throw new Error("Failed to create output file");


        // Search args

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            FileUtil.createNewFile(target);
        } else if (endpoint.getFileExist() == GenericFileExist.Override) {
            LOG.debug("Truncating existing file: {}", target);
            FileChannel out = new FileOutputStream(target).getChannel();
            try {
                out.truncate(0);
            } finally {
                IOHelper.close(out, target.getName(), LOG, endpoint.isForceWrites());
            }
        }
    }

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            Object value = attributes.get(attribute);
            switch (attribute) {
            case Size: {
                long newSize = (Long) value;
                FileChannel outChan = new FileOutputStream(file, true).getChannel();
                outChan.truncate(newSize);
                outChan.close();
                continue;
            }
            case LastModifiedTime:
                setLastModified((Long) value);

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            Object value = attributes.get(attribute);
            switch (attribute) {
                case Size:             {
                    long newSize = (Long) value;
                    FileChannel outChan = new FileOutputStream(file, true).getChannel();
                    outChan.truncate(newSize);
                    outChan.close();
                    continue;
                }
                case Uid:              name = "unix:uid"; break;
                case Gid:              name = "unix:gid"; break;

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          FileOutputStream s = null;
          FileChannel channel = null;
          try {
            s = new FileOutputStream(f);
            channel = s.getChannel();
            channel.truncate(0);
            LOG.info("Truncated block file " + f.getAbsolutePath());
            return b.getBlockId();
          } finally {
            IOUtils.cleanup(LOG, channel, s);
          }

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    // binary, XML, reparsed binary
    String edits = nnHelper.generateEdits();
    FileOutputStream os = new FileOutputStream(edits, true);
    // Corrupt the file by truncating the end
    FileChannel editsFile = os.getChannel();
    editsFile.truncate(editsFile.size() - 5);


    String editsParsedXml = folder.newFile("editsRecoveredParsed.xml")
        .getAbsolutePath();
    String editsReparsed = folder.newFile("editsRecoveredReparsed")
        .getAbsolutePath();

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            FileUtil.createNewFile(target);
        } else if (endpoint.getFileExist() == GenericFileExist.Override) {
            LOG.debug("Truncating existing file: {}", target);
            FileChannel out = new FileOutputStream(target).getChannel();
            try {
                out.truncate(0);
            } finally {
                IOHelper.close(out, target.getName(), LOG, endpoint.isForceWrites());
            }
        }
    }

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            Object value = attributes.get(attribute);
            switch (attribute) {
                case Size:             {
                    long newSize = (Long) value;
                    FileChannel outChan = new FileOutputStream(file, true).getChannel();
                    outChan.truncate(newSize);
                    outChan.close();
                    continue;
                }
                case Uid:              name = "unix:uid"; break;
                case Owner:            name = "unix:owner"; value = toUser((String) value); break;

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                long currentSize = channel.size();
                channel.position(0);
                channel.write(ByteBuffer.wrap(baos.toByteArray()));
                if (currentSize > baos.size())
                {
                    channel.truncate(baos.size());
                }
            }
            catch (IOException e)
            {
                throw new IllegalConfigurationException("Cannot store preferences", e);

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