# frozen_string_literal: true

# Copyright, 2020, by Samuel G. D. Williams. <http://www.codeotaku.com>
# 
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.

module DB
	# A buffer of records.
	class Records
		def self.wrap(result)
			# We want to avoid extra memory allocations when there are no columns:
			if result.field_count == 0 || result.row_count == 0
				return nil
			end
			
			return self.new(result.field_names, result.to_a)
		end
		
		def initialize(columns, rows)
			@columns = columns
			@rows = rows
		end
		
		def freeze
			return self if frozen?
			
			@columns.freeze
			@rows.freeze
			
			super
		end
		
		attr :columns
		attr :rows
		
		def to_a
			@rows
		end
	end
end
