Class: TimeSpan::TimeLine

Inherits:
Array
  • Object
show all
Defined in:
lib/time_span.rb

Overview

class TimeLine #

                                                                                                   #
TimeLine is how RelativeTime objects are related to each other, they have to have the same         #
  frame of reference.                                                                              #
                                                                                                   #
instance methods:                                                                                  #
                                                                                                   #
  to_s  -- convenience method to see which object we have                                          #
  position_of(obj) -- its location on the TimeLine                                                 #
  increase_after(position, amount) -- make room in the index for an insertion                      #
  append (obj)  -- add obj to end of the TimeLine                                                  #
  append_to_next(relative_object, object, relative) at relative offset to relative_object, put obj #
  insert_before_next(relative_object, object, relative) inserts into new time slot relative to relative_object
  insert_at(position, object) -- places object at position, appending if equal time exists         #
  remove(obj) -- remove object from the TimeLine                                                   #
  compress! -- compresses the TimeLine, removing [] and adjusting the index accordingly            #
                                                                                                   #

Author:

  • Craig A. .Cook

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name = "") ⇒ TimeLine 



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# File 'lib/time_span.rb', line 246

def initialize(name="")
  @name = name
  @line = []
  @indices_of = {}
  @spans = []
end

Instance Attribute Details

#indices_of ⇒ Object

Returns the value of attribute indices_of.



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# File 'lib/time_span.rb', line 243

def indices_of
  @indices_of
end

#line ⇒ Object

Returns the value of attribute line.



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# File 'lib/time_span.rb', line 243

def line
  @line
end

#name ⇒ Object

Returns the value of attribute name.



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# File 'lib/time_span.rb', line 243

def name
  @name
end

#spans ⇒ Object

Returns the value of attribute spans.



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# File 'lib/time_span.rb', line 243

def spans
  @spans
end

Instance Method Details

#==(other_timeline) ⇒ Boolean

test for value equality. Checking span trait is redundant – can’t have spans without times’



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# File 'lib/time_span.rb', line 261

def == (other_timeline)
    (object_id == other_timeline.object_id)  ||
    (@name == other_timeline.name) &&
        (@line.empty? && @indices_of.empty? && @spans.empty?) &&
        (other_timeline.line.empty? && other_timeline.indices_of.empty? && other_timeline.spans.empty?)
end

#all_endpoint_statuses ⇒ Array 



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# File 'lib/time_span.rb', line 281

def all_endpoint_statuses
  spans.inject({}){ |acc, span| acc.merge!(span.endpoint_statuses) }
end

#all_relative_time_statuses ⇒ Array

all statuses on the TimeLine



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# File 'lib/time_span.rb', line 293

def all_relative_time_statuses
  relative_times.inject([]) {|acc, v| acc << v.reference_to }
end

#append(obj) ⇒ Fixnum

add to the end of the TimeLine



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# File 'lib/time_span.rb', line 318

def append(obj)
  insert_at(@line.size, obj)
end

#append_to_next(relative_obj, obj, relative = 1) ⇒ Fixnum

inserts to the end of the relative object’s time, becoming equal with it



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# File 'lib/time_span.rb', line 326

def append_to_next(relative_obj, obj, relative=1)
  insert_at(position_of(relative_obj)+relative, obj)
end

#clone ⇒ Object

Raises:

  • (NotImplementedError) —

    Cannot use base Ruby clone which can create illegal objects by gem rules.



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# File 'lib/time_span.rb', line 254

def clone
  raise NotImplementedError, "Cannot use base Ruby clone which can create illegal objects by gem rules."
end

#compress! ⇒ nil

removes all [] elements, and decrements accordingly the @indices_of

ideally this should be transactional



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# File 'lib/time_span.rb', line 373

def compress!
  mod_level = 0
  offsets = []
  0.upto(line.size-1) do |i|
    mod_level -= 1 if @line[i].empty?
    offsets << mod_level
  end
  ## poor man's transaction.  Don't do directly on indices_of so less chance of interruption
  indices = indices_of
  indices.each_key do |key|
    indices[key] = indices[key] + offsets[indices[key]]
  end
  indices_of = indices
  @line.delete([])
end

#increase_after(pos, by = 1) ⇒ Object

bump up indices after a point, so that a RelativeTime may be inserted



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# File 'lib/time_span.rb', line 307

def increase_after(pos, by=1)
  @indices_of.each_key do |key|
    @indices_of[key] += by if (@indices_of[key] >= pos)
  end
end

#insert_at(pos, obj) ⇒ Fixnum

place obj at the numbered position

Raises:

  • (ArgumentError) 


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# File 'lib/time_span.rb', line 346

def insert_at(pos, obj)
  raise ArgumentError, "can only add a time to its own time_line" unless obj.time_line.equal? self
  if @line[pos].nil?
    @line[pos] = [obj]
  else
    op = @line[pos].kind_of?(Array) ? '<<'  : '='
    @line[pos].send(op.to_sym, obj).uniq!                # no duplicates in same position
    # dup in diff position overwrites below
  end
  @indices_of[obj] = pos
end

#insert_before_next(relative_obj, obj, relative_offset = 1) ⇒ Fixnum

inserts into a new space before the relative object (first parameter) inserts obj before relative_obj by offset



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# File 'lib/time_span.rb', line 335

def insert_before_next(relative_obj, obj, relative_offset=1)
  relative_position = position_of(relative_obj)
  increase_after(relative_position + relative_offset, relative_offset)
  @line[relative_position + relative_offset,0] = nil
  insert_at(relative_position+relative_offset, obj)
end

#inspect ⇒ String

endpoint statuses for all TimeSpans on the TimeLine, plus TimeLine name



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# File 'lib/time_span.rb', line 276

def inspect
  line.inspect + name
end

#position_of(obj) ⇒ Fixnum

find the position of a RelativeTime on the TimeLine



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# File 'lib/time_span.rb', line 301

def position_of(obj)
  @indices_of[obj]
end

#relative_times ⇒ Array

attached times only (internal API)



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# File 'lib/time_span.rb', line 287

def relative_times
  indices_of.keys
end

#remove(obj) ⇒ Object

cannot remove [] or the @indices_of will be wrong call #compress to remove the extra []s



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# File 'lib/time_span.rb', line 362

def remove(obj)
  pos =  position_of(obj)
  if pos                        # do nothing if it isn't there'
    @line[pos].delete(obj)      #  remove from list
    @indices_of.delete(obj)     #  remove from index
  end
end

#to_s ⇒ String

returns the TimeLine’s name



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# File 'lib/time_span.rb', line 270

def to_s
  name.to_s
end