lib/bson/integer.rb
# frozen_string_literal: true
# rubocop:todo all
# Copyright (C) 2009-2020 MongoDB Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
module BSON
# Injects behaviour for encoding and decoding integer values to and from
# raw bytes as specified by the BSON spec.
#
# @see http://bsonspec.org/#/specification
#
# @since 2.0.0
module Integer
# The maximum 32 bit integer value.
#
# @since 2.0.0
MAX_32BIT = (1 << 31) - 1
# The maximum 64 bit integer value.
#
# @since 2.0.0
MAX_64BIT = (1 << 63) - 1
# The minimum 32 bit integer value.
#
# @since 2.0.0
MIN_32BIT = -(1 << 31)
# The minimum 64 bit integer value.
#
# @since 2.0.0
MIN_64BIT = -(1 << 63)
# The BSON index size.
#
# @since 2.0.0
BSON_INDEX_SIZE = 1024
# A hash of index values for array optimization.
#
# @since 2.0.0
BSON_ARRAY_INDEXES = ::Array.new(BSON_INDEX_SIZE) do |i|
(i.to_s.b << NULL_BYTE).freeze
end.freeze
# Is this integer a valid BSON 32 bit value?
#
# @example Is the integer a valid 32 bit value?
# 1024.bson_int32?
#
# @return [ true, false ] If the integer is 32 bit.
#
# @since 2.0.0
def bson_int32?
(MIN_32BIT <= self) && (self <= MAX_32BIT)
end
# Is this integer a valid BSON 64 bit value?
#
# @example Is the integer a valid 64 bit value?
# 1024.bson_int64?
#
# @return [ true, false ] If the integer is 64 bit.
#
# @since 2.0.0
def bson_int64?
(MIN_64BIT <= self) && (self <= MAX_64BIT)
end
# Get the BSON type for this integer. Will depend on whether the integer
# is 32 bit or 64 bit.
#
# @example Get the BSON type for the integer.
# 1024.bson_type
#
# @return [ String ] The single byte BSON type.
#
# @see http://bsonspec.org/#/specification
#
# @since 2.0.0
def bson_type
bson_int32? ? Int32::BSON_TYPE : (bson_int64? ? Int64::BSON_TYPE : out_of_range!)
end
# Get the integer as encoded BSON.
#
# @example Get the integer as encoded BSON.
# 1024.to_bson
#
# @return [ BSON::ByteBuffer ] The buffer with the encoded object.
#
# @see http://bsonspec.org/#/specification
#
# @since 2.0.0
def to_bson(buffer = ByteBuffer.new)
if bson_int32?
buffer.put_int32(self)
elsif bson_int64?
buffer.put_int64(self)
else
out_of_range!
end
end
# Convert the integer to a 32 bit (4 bytes) raw bytes string.
#
# @example Convert the integer to it's 32 bit bytes.
# 1024.to_bson_int32
#
# @param [ String ] encoded The string to encode to.
#
# @return [ String ] The encoded string.
#
# @since 2.0.0
def to_bson_int32(encoded)
append_bson_int32(encoded)
end
# Convert the integer to a 64 bit (8 bytes) raw bytes string.
#
# @example Convert the integer to it's 64 bit bytes.
# 1024.to_bson_int64
#
# @param [ String ] encoded The string to encode to.
#
# @return [ String ] The encoded string.
#
# @since 2.0.0
def to_bson_int64(encoded)
append_bson_int32(encoded)
encoded << ((self >> 32) & 255)
encoded << ((self >> 40) & 255)
encoded << ((self >> 48) & 255)
encoded << ((self >> 56) & 255)
end
# Convert the integer to a BSON string key.
#
# @example Convert the integer to a BSON key string.
# 1.to_bson_key
#
# @return [ String ] The string key.
#
# @since 2.0.0
def to_bson_key
self
end
# Converts this object to a representation directly serializable to
# Extended JSON (https://github.com/mongodb/specifications/blob/master/source/extended-json.rst).
#
# This method returns the integer itself if relaxed representation is
# requested, otherwise a $numberInt hash if the value fits in 32 bits
# and a $numberLong otherwise. Regardless of which representation is
# requested, a value that does not fit in 64 bits raises RangeError.
#
# @option opts [ nil | :relaxed | :legacy ] :mode Serialization mode
# (default is canonical extended JSON)
#
# @return [ Hash | Integer ] The extended json representation.
def as_extended_json(**options)
# The behavior of native integers' serialization to extended json is
# not specified. Following our bson serialization logic in this file,
# produce explicit $numberInt or $numberLong, choosing $numberInt if
# the integer fits in 32 bits. In Ruby integers can be arbitrarily
# big; integers that do not fit into 64 bits raise an error as we do not
# want to silently perform an effective type conversion of integer ->
# decimal.
unless bson_int64?
raise RangeError, "Integer #{self} is too big to be represented as a MongoDB integer"
end
if options[:mode] == :relaxed || options[:mode] == :legacy
self
elsif bson_int32?
{'$numberInt' => to_s}
else
{'$numberLong' => to_s}
end
end
private
def append_bson_int32(encoded)
encoded << (self & 255)
encoded << ((self >> 8) & 255)
encoded << ((self >> 16) & 255)
encoded << ((self >> 24) & 255)
end
def out_of_range!
raise RangeError.new("#{self} is not a valid 8 byte integer value.")
end
end
# Enrich the core Integer class with this module.
#
# @since 2.0.0
::Integer.send(:include, Integer)
end