depot.rb

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  def sync()
    mod_sync(@index)
  end
  ##
  # bool = depot.optimize(bnum)
  # Method: Optimize the database.
  # `bnum' specifies the number of the elements of the bucket array.  If it is omitted or not
  # more than 0, the default value is specified.
  # The return value is always `true'.
  # An exception of `Depot::EANY' or its sub classes is thrown if an error occures.
  # In an alternating succession of deleting and storing with overwrite or concatenate,
  # dispensable regions accumulate.  This method is useful to do away with them.
  #
  def optimize(bnum = -1)
    mod_optimize(@index, bnum)
  end
  ##
  # num = depot.fsiz()
  # Method: Get the size of the database file.
  # The return value is the size of the database file.
  # An exception of `Depot::EANY' or its sub classes is thrown if an error occures.
  #
  def fsiz()
    mod_fsiz(@index)
  end
  ##
  # num = depot.bnum()
  # Method: Get the number of the elements of the bucket array.
  # The return value is the number of the elements of the bucket array
  # An exception of `Depot::EANY' or its sub classes is thrown if an error occures.
  #
  def bnum()
    mod_bnum(@index)
  end
  ##
  # num = depot.rnum()
  # Method: Get the number of the records stored in the database.
  # The return value is the number of the records stored in the database.
  # An exception of `Depot::EANY' or its sub classes is thrown if an error occures.
  #
  def rnum()
    mod_rnum(@index)
  end
  ##
  # num = depot.length()
  # Method: An alias of `rnum'.
  #
  alias length rnum
  ##
  # num = depot.size()
  # Method: An alias of `rnum'.
  #
  alias size rnum
  ##
  # bool = depot.writable()
  # Method: Check whether the database handle is a writer or not.
  # The return value is true if the handle is a writer, false if not.
  # An exception of `Depot::EANY' or its sub classes is thrown if an error occures.
  #
  def writable()
    mod_writable(@index)
  end
  ##
  # bool = depot.fatalerror()
  # Method: Check whether the database has a fatal error or not.
  # The return value is true if the database has a fatal error, false if not.
  # An exception of `Depot::EANY' or its sub classes is thrown if an error occures.
  #
  def fatalerror()
    mod_fatalerror(@index)
  end
  ##
  # depot.each() do |key, val| ... end
  # Iterator Method: Iterate a process with a pair of a key and a value of each record.
  #
  def each()
    MyMutex.synchronize() do
      iterinit()
      while(true)
        begin
          key = iternext()
          val = get(key)
        rescue ENOITEM
          break
        end
        yield(key, val)
      end
      iterinit()
    end
    self
  end
  ##
  # depot.each_pair() do |key, val| ... end
  # Iterator Method: An alias of `each'.
  #
  alias each_pair each
  ##
  # depot.each_key() do |key| ... end
  # Iterator Method: Iterate a process with a key of each record.
  #
  def each_key()
    MyMutex.synchronize() do
      iterinit()
      while(true)
        begin
          key = iternext()
        rescue ENOITEM
          break
        end
        yield(key)
      end
      iterinit()
    end
    self
  end
  ##
  # depot.each_value() do |val| ... end
  # Iterator Method: Iterate a process with a value of each record.
  #
  def each_value()
    MyMutex.synchronize() do
      iterinit()
      while(true)
        begin
          val = get(iternext())
        rescue ENOITEM
          break
        end
        yield(val)
      end
      iterinit()
    end
    self
  end
  ##
  # ary = depot.keys()
  # Method: Get an array of all keys.
  # The return value is an array of all keys.
  # An exception of `Depot::EANY' or its sub classes is thrown if an error occures.
  #
  def keys()
    ary = Array::new(rnum())
    MyMutex.synchronize() do
      iterinit()
      0.upto(ary.length - 1) do |i|
        ary[i] = iternext()
      end
      iterinit()
    end
    ary
  end
  ##
  # ary = depot.values()
  # Method: Get an array of all values.
  # The return value is an array of all values.
  # An exception of `Depot::EANY' or its sub classes is thrown if an error occures.
  #
  def values()
    ary = Array::new(rnum())
    MyMutex.synchronize() do
      iterinit()
      0.upto(ary.length - 1) do |i|
        ary[i] = get(iternext())
      end
      iterinit()
    end
    ary
  end
  ##
  # str = depot.index(val)
  # Method: Retrieve a record with a value.
  # `val' specifies a value.  Although it must be an instance of String, binary data is okey.
  # The return value is the key of the record with the specified value.
  # An exception of `Depot::EANY' or its sub classes is thrown if an error occures or no record
  # corresponds.
  # If two or more records correspond, the first found record is selected.
  #
  def index(val)
    key = nil
    MyMutex.synchronize() do
      iterinit()
      while(true)
        key = iternext()
        (get(key) == val) && break
      end
      iterinit()
    end
    key
  end
  ##
  # num = depot.to_int()
  # Method: An alias of `rnum'.
  #
  alias to_int rnum
  ##
  # num = depot.to_i()
  # Method: An alias of `to_int'.
  #
  alias to_i to_int
  ##
  # str = depot.to_str()
  # Method: Get string standing for the instance.
  #
  def to_str
    if(@index != -1)
      sprintf("#<Depot:%#x:name=%s:state=open:bnum=%d:rnum=%d>",
              object_id(), @name, bnum(), rnum())
    else
      sprintf("#<Depot:%#x:name=%s:state=closed>", object_id(), @name)
    end
  end
  ##
  # str = depot.to_s()
  # Method: An alias of `to_str'.
  #
  alias to_s to_str
  ##
  # ary = depot.to_ary()
  # Method: Get an array of alternation of each pair of a key and a value.
  #
  def to_ary
    ary = Array::new(rnum())
    i = 0
    each() do |key, val|
      ary[i] = [key, val]
      i += 1
    end
    ary
  end
  ##
  # ary = depot.to_a()
  # Method: An alias of `to_ary'.
  #
  alias to_a to_ary
  ##
  # hash = depot.to_hash()
  # Method: Get a hash storing all records.
  #
  def to_hash
    hash = Hash::new()
    each() do |key, val|
      hash[key] = val
    end
    hash
  end
  ##
  # hash = depot.to_h()
  # Method: An alias of `to_hash'.
  #
  alias to_h to_hash
  ##
  # str = depot.inspect()
  # Method: An alias of `to_str'.
  #
  alias inspect to_str
end


#----------------------------------------------------------------
# Alias definition of class methods
#----------------------------------------------------------------
class << Depot
  alias open new
end



# END OF FILE