Class: MiqSqlite3DB::MiqSqlite3Cell

Inherits:
Object
  • Object
show all
Defined in:
lib/db/MiqSqlite/MiqSqlite3Cell.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(page, pointer) ⇒ MiqSqlite3Cell

Returns a new instance of MiqSqlite3Cell.



11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
 
# File 'lib/db/MiqSqlite/MiqSqlite3Cell.rb', line 11

def initialize(page, pointer)
  @page    = page
  @pointer = pointer
  @data = @key = @left_child = @fields = nil

  offset = nData = 0
  unless @page.leaf
    @left_child = @page.buf[@pointer + offset, 4].unpack('N')[0]
    offset += 4
  end

  if @page.hasData
    nData, count = MiqSqlite3DB.variableInteger(@page.buf[@pointer + offset, 9])
    offset += count
  end

  nKey, count = MiqSqlite3DB.variableInteger(@page.buf[@pointer + offset, 9])
  offset += count
  if @page.intKey
    @key = nKey
    nKey = 0
  end

  getPayload(nData, nKey, offset)
end

Instance Attribute Details

#data ⇒ Object

Returns the value of attribute data.



9
10
11
 
# File 'lib/db/MiqSqlite/MiqSqlite3Cell.rb', line 9

def data
  @data
end

#key ⇒ Object

Returns the value of attribute key.



9
10
11
 
# File 'lib/db/MiqSqlite/MiqSqlite3Cell.rb', line 9

def key
  @key
end

#left_child ⇒ Object

Returns the value of attribute left_child.



9
10
11
 
# File 'lib/db/MiqSqlite/MiqSqlite3Cell.rb', line 9

def left_child
  @left_child
end

#pointer ⇒ Object

Returns the value of attribute pointer.



9
10
11
 
# File 'lib/db/MiqSqlite/MiqSqlite3Cell.rb', line 9

def pointer
  @pointer
end

Instance Method Details

#dump ⇒ Object 



79
80
81
82
83
84
85
86
87
88
89
90
 
# File 'lib/db/MiqSqlite/MiqSqlite3Cell.rb', line 79

def dump
  puts "======== Dumping Cell ========="
  puts "Page:                            #{@page.pagenum}"
  puts "Cell:                            #{@pointer}"
  puts "Left Child:                      #{@left_child}" if @left_child
  puts "Key:                             #{@key}"        if @key
  puts "Data:                            #{@data}"       if @data
  puts "Data Length:                     #{@data.size}"  if @data
  fields.each do |f|
    p f
  end
end

#fields ⇒ Object 



37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
 
# File 'lib/db/MiqSqlite/MiqSqlite3Cell.rb', line 37

def fields
  return @fields if @fields

  return nil if @data.nil?
  len     = @data[0].ord
  @fields = []
  offset   = len
  byte     = 1
  while byte < len
    val, count  = MiqSqlite3DB.variableInteger(@data[byte..-1])
    byte += count
    flen, type = decodeField(val)

    field = {}
    if flen == 0
      if type == 'null'
        field['type'] = 'text'
        field['data'] = nil
      else
        field['type'] = 'boolean'
        field['data'] = true   if type == 'true'
        field['data'] = false  if type == 'false'
      end
    else
      field['len']  = flen
      field['type'] = type
      fdata = @data[offset, flen]
      offset += flen
      if type == 'integer'
        fdata = "\x00".concat(fdata) if flen == 3
        field['data'] = fdata.unpack("C")[0]  if flen == 1
        field['data'] = fdata.unpack("n")[0]  if flen == 2
        field['data'] = fdata.unpack("N")[0]  if flen == 3 || flen == 4
      else
        field['data'] = fdata
      end
    end
    @fields << field
  end
  @fields
end