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

      if (lCopiedSize != lSourceSize)
      {
         throw new IOException("Copy stopped before entire file copied");
      }
      
      ochannel.truncate(lSourceSize);
      ochannel.close();
      ostream.close();
   }

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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.force(out, target.getName(), LOG);
                IOHelper.close(out, target.getName(), LOG);
            }
        }

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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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            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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                        break;
                    pos = buf.position();
                }


                if (pos < ch.size()) {
                    ch.truncate(pos);
                    flushed_size = size = pos;
                    LOG.info("Segment " + path + " is Truncated at " + pos);
                }
            } finally {
                lock.release();

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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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        FileUtils.createDirectories(getBaseDir() + "/fs");
        FileChannel c = FileUtils.open(f, "rw");
        c.position(4000);
        c.write(ByteBuffer.wrap(new byte[1]));
        FileLock lock = c.tryLock();
        c.truncate(0);
        if (lock != null) {
            lock.release();
        }
        c.close();
    }

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            fail();
        } catch (IOException e) {
            // expected
        }
        try {
            fc.truncate(10);
            fail();
        } catch (IOException e) {
            // expected
        }
        channel.close();

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                    ra.write(buffer, 0, buffer.length);
                    break;
                }
                case 2: {
                    trace("truncate " + pos);
                    f.truncate(pos);
                    if (pos < ra.length()) {
                        // truncate is supposed to have no effect if the
                        // position is larger than the current size
                        ra.setLength(pos);
                    }

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