Class: FDB::DirectoryLayer

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

Constant Summary collapse

@@SUBDIRS = 
0
@@VERSION = 
[1,0,0]

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ DirectoryLayer

Returns a new instance of DirectoryLayer.



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# File 'lib/fdbdirectory.rb', line 146

def initialize(options={})
  defaults = { :node_subspace => Subspace.new([], "\xfe"), 
               :content_subspace =>Subspace.new, 
               :allow_manual_prefixes => false }

  options = defaults.merge(options)

  @content_subspace = options[:content_subspace]
  @node_subspace = options[:node_subspace]
  @allow_manual_prefixes = options[:allow_manual_prefixes]

  @root_node = @node_subspace[@node_subspace.key]
  @allocator = HighContentionAllocator.new(@root_node['hca'])

  @path = []
  @layer = ''
end

Instance Attribute Details

#path ⇒ Object 



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# File 'lib/fdbdirectory.rb', line 164

def path
  return @path.dup
end

Instance Method Details

#create(db_or_tr, path, options = {}) ⇒ Object 



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# File 'lib/fdbdirectory.rb', line 183

def create(db_or_tr, path, options={})
  create_or_open_internal(db_or_tr, path, true, false, options)
end

#create_or_open(db_or_tr, path, options = {}) ⇒ Object 



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# File 'lib/fdbdirectory.rb', line 175

def create_or_open(db_or_tr, path, options={})
  create_or_open_internal(db_or_tr, path, true, true, options)
end

#exists?(db_or_tr, path = []) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/fdbdirectory.rb', line 264

def exists?(db_or_tr, path=[])
  db_or_tr.transact do |tr|
    check_version(tr, false)

    path = to_unicode_path(path)
    node = find(tr, path).prefetch_metadata(tr)

    next false if !node.exists?

    if node.is_in_partition?
      next node.get_contents(self).exists?(tr, node.get_partition_subpath)
    end

    true
  end
end

#layer ⇒ Object 



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# File 'lib/fdbdirectory.rb', line 168

def layer
  return @layer.dup
end

#list(db_or_tr, path = []) ⇒ Object 



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# File 'lib/fdbdirectory.rb', line 247

def list(db_or_tr, path=[])
  db_or_tr.transact do |tr|
    check_version(tr, false)

    path = to_unicode_path(path)
    node = find(tr, path).prefetch_metadata(tr)

    raise ArgumentError, 'The directory does not exist.' unless node.exists?

    if node.is_in_partition?(nil, true)
      next node.get_contents(self).list(tr, node.get_partition_subpath)
    end

    subdir_names_and_nodes(tr, node.subspace).map { |name, node| name }
  end
end

#move(db_or_tr, old_path, new_path) ⇒ Object 



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# File 'lib/fdbdirectory.rb', line 191

def move(db_or_tr, old_path, new_path)
  db_or_tr.transact do |tr|
    check_version(tr, true)

    old_path = to_unicode_path(old_path)
    new_path = to_unicode_path(new_path)

    if old_path == new_path[0...old_path.length]
      raise ArgumentError, 
        'The desination directory cannot be a subdirectory of the source directory.'
    end

    old_node = find(tr, old_path).prefetch_metadata(tr)
    new_node = find(tr, new_path).prefetch_metadata(tr)

    raise ArgumentError, 'The source directory does not exist.' unless old_node.exists?

    if old_node.is_in_partition? || new_node.is_in_partition?
      if !old_node.is_in_partition? || 
        !new_node.is_in_partition? || 
        old_node.path != new_node.path
      then
        raise ArgumentError, 'Cannot move between partitions'
      end

      next new_node
        .get_contents(self)
        .move(tr, old_node.get_partition_subpath, new_node.get_partition_subpath)
    end

    if new_node.exists?
      raise ArgumentError, 'The destination directory already exists. Remove it first.'
    end

    parent_node = find(tr, new_path[0...-1])
    if !parent_node.exists?
      raise ArgumentError, 
        'The parent directory of the destination directory does not exist. Create it first.'
    end
    
    tr[parent_node.subspace[@@SUBDIRS][new_path[-1]]] = 
      @node_subspace.unpack(old_node.subspace.key)[0]
    remove_from_parent(tr, old_path)

    contents_of_node(old_node.subspace, new_path, old_node.layer)
  end
end

#move_to(db_or_tr, new_absolute_path) ⇒ Object 



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# File 'lib/fdbdirectory.rb', line 187

def move_to(db_or_tr, new_absolute_path)
  raise 'The root directory cannot be moved.'
end

#open(db_or_tr, path, options = {}) ⇒ Object 



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# File 'lib/fdbdirectory.rb', line 179

def open(db_or_tr, path, options={})
  create_or_open_internal(db_or_tr, path, false, true, options)
end

#remove(db_or_tr, path = []) ⇒ Object 



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# File 'lib/fdbdirectory.rb', line 239

def remove(db_or_tr, path=[])
  remove_internal(db_or_tr, path, true)
end

#remove_if_exists(db_or_tr, path = []) ⇒ Object 



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

def remove_if_exists(db_or_tr, path=[])
  remove_internal(db_or_tr, path, false)
end