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

      fail();
    } catch (ClosedChannelException expected) {
    }


    try {
      channel.truncate(0);
      fail();
    } catch (ClosedChannelException expected) {
    }


    try {

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      fail();
    } catch (NonWritableChannelException expected) {
    }


    try {
      channel.truncate(0);
      fail();
    } catch (NonWritableChannelException expected) {
    }


    try {

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  @Test
  public void testTruncateNegative() throws IOException {
    FileChannel channel = channel(regularFile(0), READ, WRITE);


    try {
      channel.truncate(-1);
      fail();
    } catch (IllegalArgumentException expected) {
    }
  }

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                                        numObjectsBuffer.putInt(0, ii);
                                        fc.position(0);
                                        while (numObjectsBuffer.hasRemaining()) {
                                            fc.write(numObjectsBuffer);
                                        }
                                        fc.truncate(readBuffer.position() - (nextObjectLength + PBDSegment.m_objectHeaderBytes));
                                    }


                                } else {
                                    addToNumObjects(-(numObjects - objectsProcessed));
                                    //Partial object truncation

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                                    readBuffer.putInt(0, ii + 1);


                                    /*
                                     * SHOULD REALLY make a copy of the original and then swap them with renaming
                                     */
                                    fc.truncate(readBuffer.position());
                                }
                                //Set last segment and break the loop over this segment
                                if (lastSegmentIndex == null) {
                                    lastSegmentIndex = segmentIndex;
                                }

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                final long length = getCurrentJournalSize();
                final boolean matches = length == (_writeBuffer.position() + _writeBufferAddress) % _blockSize;
                final FileChannel channel = getFileChannel(_currentAddress);
                Debug.$assert1.t(matches);
                if (matches) {
                    channel.truncate(length);
                }
                channel.force(true);
            } catch (final IOException ioe) {
                throw new PersistitIOException(ioe);
            }

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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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                final long length = getCurrentJournalSize();
                final boolean matches = length == (_writeBuffer.position() + _writeBufferAddress) % _blockSize;
                final FileChannel channel = getFileChannel(_currentAddress);
                Debug.$assert1.t(matches);
                if (matches) {
                    channel.truncate(length);
                }
                channel.force(true);
            } catch (IOException ioe) {
                throw new PersistitIOException(ioe);
            }

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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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                final long length = getCurrentJournalSize();
                final boolean matches = length == (_writeBuffer.position() + _writeBufferAddress) % _blockSize;
                final FileChannel channel = getFileChannel(_currentAddress);
                Debug.$assert1.t(matches);
                if (matches) {
                    channel.truncate(length);
                }
                channel.force(true);
            } catch (final IOException ioe) {
                throw new PersistitIOException(ioe);
            }

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