Class: Coopy::CompareTable

Inherits:
Object
  • Object
show all
Defined in:
lib/coopy/compare_table.rb

Instance Method Summary collapse

Instance Method Details

#align ⇒ Object 



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# File 'lib/coopy/compare_table.rb', line 13

def align 
  alignment = Coopy::Alignment.new
  align_core(alignment)
  alignment
end

#align_columns(align, a, b) ⇒ Object 



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# File 'lib/coopy/compare_table.rb', line 156

def align_columns(align, a, b) 
  align.range(a.width,b.width)
  align.tables(a,b)
  align.set_rowlike(false)
    
  slop = 5
  
  va = a.get_cell_view
  vb = b.get_cell_view
  ra_best = 0
  rb_best = 0
  ct_best = -1
  ma_best = nil
  mb_best = nil
  ra_header = 0
  rb_header = 0
  ra_uniques = 0
  rb_uniques = 0
  (0..slop-1).each do |ra| 
    break if (ra>=a.height)
    (0..slop-1).each do |rb| 
      break if (rb>=b.height)
      ma = {}
      mb = {}
      ct = 0
      uniques = 0
      (0..a.width-1).each do |ca| 
        key = va.to_s(a.get_cell(ca,ra))
        if (ma.has_key?(key)) 
          ma[key] = -1
          uniques-=1
        else 
          ma[key] = ca
          uniques+=1
        end
      end
      if (uniques>ra_uniques) 
        ra_header = ra
        ra_uniques = uniques
      end
      uniques = 0
      (0..b.width-1).each do |cb|
        key = vb.to_s(b.get_cell(cb,rb))
        if (mb.has_key?(key)) 
          mb[key] = -1
          uniques-=1
        else 
          mb[key] = cb
          uniques+=1
        end
      end
      if (uniques>rb_uniques) 
        rb_header = rb
        rb_uniques = uniques
      end

      ma.keys.each do |key| 
        i0 = ma[key]
        i1 = mb[key]
        if (i1 && i1>=0 && i0>=0) 
          ct+=1
        end
      end

      if (ct>ct_best) 
        ct_best = ct
        ma_best = ma
        mb_best = mb
        ra_best = ra
        rb_best = rb
      end
    end
  end

  return if (ma_best.nil?)
  ma_best.keys.each do |key|
    i0 = ma_best[key]
    i1 = mb_best[key]
    if (i1>=0 && i0>=0) 
      align.link(i0,i1)
    end
  end
  align.headers(ra_header,rb_header)
end

#align_core(align) ⇒ Object 



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# File 'lib/coopy/compare_table.rb', line 23

def align_core(align) 
  if (@comp.p.nil?) 
    align_core_2(align,@comp.a,@comp.b)
    return
  end
  align.reference = Coopy::Alignment.new
  align_core_2(align,@comp.p,@comp.b)
  align_core_2(align.reference,@comp.p,@comp.a)
  align.meta.reference = align.reference.meta
end

#align_core_2(align, a, b) ⇒ Object 



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# File 'lib/coopy/compare_table.rb', line 35

def align_core_2(align, a, b) 
  if (align.meta.nil?) 
    align.meta = Coopy::Alignment.new
  end
  align_columns(align.meta,a,b)
  column_order = align.meta.to_order
  common_units = []
  column_order.get_list.each do |unit| 
    if (unit.l>=0 && unit.r>=0 && unit.p!=-1) 
      common_units << unit
    end
  end

  align.range(a.height,b.height)
  align.tables(a,b)
  align.set_rowlike(true)
    
  w  = a.width
  ha = a.height
  hb = b.height

  av = a.get_cell_view

  # If we have more columns than we have time to process their
  # combinations, we need to haul out some heuristics.

  n = 5
  columns = []
  if (common_units.length>n) 
    columns_eval = []
    (0..common_units.length-1).each do |i| 
      ct = 0
      mem = {}
      mem2 = {}
      ca = common_units[i].l
      cb = common_units[i].r
      (0..ha-1).each do |j| 
        key = av.to_s(a.get_cell(ca,j))
        if (!mem.has_key?(key)) 
          mem[key] = 1
          ct+=1
        end
      end
      (0..hb-1).each do |j| 
        key = av.to_s(b.get_cell(cb,j))
        if (!mem2.has_key?(key)) 
          mem2[key] = 1
          ct+=1
        end
      end
      columns_eval << [i,ct]
    end
    columns_eval.sort { |a,b| a[1] <=> b[1] }
    columns = columns_eval.map{ |v| v[0] }
    columns = columns.slice(0,n)
  else
    (0..common_units.length-1).each do |i| 
      columns << i
    end
  end

  top = (2 ** columns.length).round

  pending = {}
  (0...ha).each do |j| 
    pending[j] = j
  end
  pending_ct = ha
  
  (0...top).each do |k| 
    next if (k==0)
    break if (pending_ct == 0)
    active_columns = []
    kk = k
    at = 0
    while (kk>0) 
      if (kk%2==1) 
        active_columns << columns[at]
      end
      kk >>= 1
      at+=1
    end

    index = IndexPair.new
    (0...active_columns.length).each do |k|
      unit = common_units[active_columns[k]]
      index.add_columns(unit.l,unit.r)
      align.add_index_columns(unit)
    end
    index.index_tables(a,b)

    h = a.height
    h = b.height if (b.height>h)
    h = 1 if (h<1)
    wide_top_freq = index.get_top_freq
    ratio = wide_top_freq
    ratio /= (h+20) # "20" allows for low-data 
    next if (ratio>=0.1) # lousy no-good index, move on

    if @indexes
      @indexes << index
    end

    fixed  = []
    pending.keys.each do |j| 
      cross = index.query_local(j)
      spot_a = cross.spot_a
      spot_b = cross.spot_b
      next if (spot_a!=1 || spot_b!=1)
      fixed << j
      align.link(j,cross.item_b.lst[0])
    end
    (0...fixed.length).each do |j|
      pending.delete(fixed[j])
      pending_ct-=1
    end
  end
  # we expect headers on row 0 - link them even if quite different.
  align.link(0,0)
end

#attach(comp) ⇒ Object 



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# File 'lib/coopy/compare_table.rb', line 4

def attach(comp)
  @comp = comp # TableComparisonState
  more = compare_core
  while (more && @comp.run_to_completion) do
    more = compare_core
  end
  !more
end

#compare_core ⇒ Object 



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# File 'lib/coopy/compare_table.rb', line 307

def compare_core
  return false if (@comp.completed) 
  if (!@comp.is_equal_known) 
    return test_is_equal
  end
  if (!@comp.has_same_columns_known) 
    return test_has_same_columns
  end
  @comp.completed = true
  false
end

#get_comparison_state ⇒ Object 



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# File 'lib/coopy/compare_table.rb', line 19

def get_comparison_state 
  @comp
end

#get_indexes ⇒ Object 



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# File 'lib/coopy/compare_table.rb', line 323

def get_indexes
  @indexes
end

#has_same_columns_2(a, b) ⇒ Object 



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# File 'lib/coopy/compare_table.rb', line 254

def has_same_columns_2(a, b)
  if (a.width!=b.width) 
    return false
  end
  if (a.height==0 || b.height==0) 
    return true
  end

  # check for a blatant header - should only do this
  # for meta-data free tables, that may have embedded headers
  av = a.get_cell_view
  (0..a.width-1).each do |i|
    ((i+1)..a.width-1).each do |j|
      if (av.equals(a.get_cell(i,0),a.get_cell(j,0))) 
        return false
      end
    end
    if (!av.equals(a.get_cell(i,0),b.get_cell(i,0))) 
      return false
    end
  end

  return true
end

#is_equal_2(a, b) ⇒ Object 



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# File 'lib/coopy/compare_table.rb', line 292

def is_equal_2(a, b) 
  if (a.width!=b.width || a.height!=b.height) 
    return false
  end
  av = a.get_cell_view
  (0..a.height-1).each do |i|
    (0..a.width-1).each do |j| 
      if (!av.equals(a.get_cell(j,i),b.get_cell(j,i))) 
        return false
      end
    end
  end
  return true
end

#store_indexes ⇒ Object 



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# File 'lib/coopy/compare_table.rb', line 319

def store_indexes
  @indexes = []
end

#test_has_same_columns ⇒ Object 



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# File 'lib/coopy/compare_table.rb', line 241

def test_has_same_columns 
  p = @comp.p
  a = @comp.a
  b = @comp.b
  eq = has_same_columns_2(a,b)
  if (eq && p)
    eq = has_same_columns_2(p,a)
  end
  @comp.has_same_columns = eq
  @comp.has_same_columns_known = true
  return true
end

#test_is_equal ⇒ Object 



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# File 'lib/coopy/compare_table.rb', line 279

def test_is_equal
  p = @comp.p
  a = @comp.a
  b = @comp.b
  eq = is_equal_2(a,b)
  if (eq && p) 
    eq = is_equal_2(p,a)
  end
  @comp.is_equal = eq
  @comp.is_equal_known = true
  true
end