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

          java.io.File fileData = new java.io.File(tempUserFolder.getAbsolutePath() + java.io.File.separator + fileName);
          if(fileData.exists())
            fileData.delete();
          // Saving the new working data
          FileChannel writeCurrentChannel = new FileOutputStream(fileData).getChannel();
          writeCurrentChannel.truncate(0);
          ByteBuffer buffer = ByteBuffer.allocate(currentData.length);
          buffer.put(currentData);
          buffer.position(0);
          writeCurrentChannel.write(buffer);
          writeCurrentChannel.force(false);

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              if(fileData.exists())
                fileData.delete();
            }
          // Saving the new working data
          FileChannel writeCurrentChannel = new FileOutputStream(fileData).getChannel();
          writeCurrentChannel.truncate(0);
          ByteBuffer buffer = ByteBuffer.allocate(currentData.length);
          buffer.put(currentData);
          buffer.position(0);
          writeCurrentChannel.write(buffer);
          writeCurrentChannel.force(false);

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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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    // binary, XML, reparsed binary
    String edits          = nnHelper.generateEdits();
    
    // Corrupt the file by truncating the end
    FileChannel editsFile = new FileOutputStream(edits, true).getChannel();
    editsFile.truncate(editsFile.size() - 5);
    
    String editsParsedXml = cacheDir + "/editsRecoveredParsed.xml";
    String editsReparsed  = cacheDir + "/editsRecoveredReparsed";
    String editsParsedXml2 = cacheDir + "/editsRecoveredParsed2.xml";

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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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        RandomAccessFile raFile = new RandomAccessFile((File)args[1], "rw");
        try {
          FileChannel channel = raFile.getChannel();
          long filesize = channel.size();
          assertFalse(0 == filesize);
          channel.truncate(filesize-1);
        } finally {
          raFile.close();
        }
      } else { // HDFS: decrement last block size
        assertTrue(args[0] instanceof DistributedFileSystem);

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  private void truncateFile(File f) throws IOException {
    assertTrue(f.exists() && f.length() != 0);
    FileOutputStream s = new FileOutputStream(f);
    FileChannel channel = s.getChannel();
    channel.truncate(0);
    LOG.info("Truncated block file " + f.getAbsolutePath());
    s.close();
  }
  
  public ScanChecker checker() {

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        File mf = BlockWithChecksumFileWriter.getMetaFile(f, b.getBlock());
        // 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());
          long blockId = b.getBlock().getBlockId();
          s.close();
          return blockId;
        }

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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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        if (!this.file.exists()) {
            this.file.createNewFile();
        }


        final FileChannel channel = new RandomAccessFile(this.file, "rw").getChannel();
        channel.truncate(0);
        this.fileMessageSet = new FileMessageSet(channel);
    }




    @After

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