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Contents
# Copyright 2016 Google Inc. All rights reserved.
#
# 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 Google
module Cloud
module Datastore
##
# # Cursor
#
# Cursor is a point in query results. Cursors are returned in
# QueryResults.
#
# @example
# require "google/cloud/datastore"
#
# datastore = Google::Cloud::Datastore.new
#
# query = datastore.query("Task").
# where("done", "=", false)
#
# tasks = datastore.run query
# tasks.cursor.to_s #=> "c2Vjb25kLXBhZ2UtY3Vyc29y"
#
class Cursor
# Base64 encoded array of bytes
def initialize cursor
@cursor = cursor
end
# Base64 encoded array of bytes
def to_s
@cursor
end
# @private
def inspect
"#{self.class}(#{@cursor})"
end
# @private
def == other
return false unless other.is_a? Cursor
@cursor == other.to_s
end
# @private
def <=> other
return -1 unless other.is_a? Cursor
@cursor <=> other.to_s
end
# @private byte array as a string
def to_grpc
Convert.decode_bytes(@cursor)
end
# @private byte array as a string
def self.from_grpc grpc
grpc = String grpc
return nil if grpc.empty?
new Convert.encode_bytes(grpc)
end
end
end
end
end
Version data entries
8 entries across 8 versions & 1 rubygems