text: ###############################################################################
  #
  # Copyright (c) 2016, Henrique Morimitsu,
  # University of Sao Paulo, Sao Paulo, Brazil
  #
  # All rights reserved.
  #
  # Redistribution and use in source and binary forms, with or without
  # modification, are permitted provided that the following conditions are met:
  # 1. Redistributions of source code must retain the above copyright notice, this
  #    list of conditions and the following disclaimer.
  # 2. Redistributions in binary form must reproduce the above copyright notice,
  #    this list of conditions and the following disclaimer in the documentation
  #    and/or other materials provided with the distribution.
  # 3. Neither the name of the copyright holder nor the names of its contributors
  #    may be used to endorse or promote products derived from this software
  #    without specific prior written permission.
  #
  # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  # DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  # SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  # CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  # OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  #
  # #############################################################################
  
  from Rectangle import Rectangle
  
  
  class Annotation(object):
      """ Represents one annotation file.
  
      Class variables:
      - entries: a list where each element represents one entry (line) of the file
      """
      def __init__(self, entries=None):
          self._entries = entries
          if entries is None:
              self._entries = []
  
      def add_entry(self, x, y, width, height, entry_index=-1):
          """ Adds or updates an entry of the list. If entry_index is negative,
          the entry is appended to the list, otherwise, the element at entry_index
          is replaced.
          """
          entry = Rectangle(x, y, width, height)
          if entry_index < 0:
              self._entries.append(entry)
          else:
              self._entries[entry_index] = entry
  
      def get_entry(self, entry_index):
          """ Returns one entry of the list """
          return self._entries[entry_index]
  
      def length(self):
          """ Returns the length of the list of entries. """
          return len(self._entries)
  
      def read(self, file_path, separator=','):
          """ Populates the entries list from the contents of a file.
          Each line of the file corresponds to one entry and it must follow the
          format:
          x,y,width,height
          where the separator (comma in the example above) may be changed
          """
          self._entries = []
          ann_file = open(file_path, 'r')
          content = ann_file.read()
          lines = content.replace('\r\n', '\n').split('\n')
          for line in lines:
              if len(line) > 0:
                  vals = [int(float(x)) for x in line.split(separator)]
                  entry = Rectangle(*vals)
                  self._entries.append(entry)
          ann_file.close()
  
      def write(self, file_path, separator=','):
          """ Saves the entries list to a file.
          Each entry of the list will be saved as a separated line following the
          format:
          x,y,width,height
          where the separator (comma in the example above) may be changed
          """
          ann_file = open(file_path, 'w')
  
          for entry in self._entries:
              outLine = str(int(entry.x)) + separator + str(int(entry.y)) + separator + \
                  str(int(entry.width)) + separator + str(int(entry.height)) + '\n'
              ann_file.write(outLine)
  
          ann_file.close()
          print('Wrote annotation file:', file_path)
  