Class: Megam::JSONCompat

Inherits:
Object
  • Object
show all
Defined in:
lib/megam/core/json_compat.rb

Constant Summary collapse

JSON_MAX_NESTING = 
1000
JSON_CLAZ = 
"json_claz".freeze
MEGAM_AUTH = 
"Megam::Auth".freeze
MEGAM_ERROR = 
"Megam::Error".freeze
MEGAM_ACCOUNT = 
"Megam::Account".freeze
MEGAM_ASSEMBLIES = 
"Megam::Assemblies".freeze
MEGAM_ASSEMBLIESCOLLECTION = 
"Megam::AssembliesCollection".freeze
MEGAM_ASSEMBLY = 
"Megam::Assembly".freeze
MEGAM_ASSEMBLYCOLLECTION = 
"Megam::AssemblyCollection".freeze
MEGAM_COMPONENTS = 
"Megam::Components".freeze
MEGAM_COMPONENTSCOLLECTION = 
"Megam::ComponentsCollection".freeze
MEGAM_REQUEST = 
"Megam::Request".freeze
MEGAM_REQUESTCOLLECTION = 
"Megam::RequestCollection".freeze
MEGAM_ORGANIZATION = 
"Megam::Organizations".freeze
MEGAM_DOMAIN = 
"Megam::Domains".freeze
MEGAM_PREDEFCLOUD = 
"Megam::PredefCloud".freeze
MEGAM_PREDEFCLOUDCOLLECTION = 
"Megam::PredefCloudCollection".freeze
MEGAM_CLOUDTOOLSETTING = 
"Megam::CloudToolSetting".freeze
MEGAM_CLOUDTOOLSETTINGCOLLECTION = 
"Megam::CloudToolSettingCollection".freeze
MEGAM_SSHKEY = 
"Megam::SshKey".freeze
MEGAM_SSHKEYCOLLECTION = 
"Megam::SshKeyCollection".freeze
MEGAM_MARKETPLACE = 
"Megam::MarketPlace".freeze
MEGAM_MARKETPLACECOLLECTION = 
"Megam::MarketPlaceCollection".freeze
MEGAM_MARKETPLACEADDON = 
"Megam::MarketPlaceAddons".freeze
MEGAM_MARKETPLACEADDONCOLLECTION = 
"Megam::MarketPlaceAddonsCollection".freeze
MEGAM_CSAR = 
"Megam::CSAR".freeze
MEGAM_CSARCOLLECTION = 
"Megam::CSARCollection".freeze

Class Method Summary collapse

Class Method Details

.class_for_json_class(json_class) ⇒ Object

Map JSON_CLAZ to a Class object. We use a case instead of a Hash assigned to a constant because otherwise this file could not be loaded until all the constants were defined, which means you'd have to load the world to get json.



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# File 'lib/megam/core/json_compat.rb', line 126

def class_for_json_class(json_class)
  case json_class
  when MEGAM_ERROR
    Megam::Error
  when MEGAM_AUTH
    Megam::Auth
  when MEGAM_ACCOUNT
    Megam::Account
  when MEGAM_ASSEMBLIES
    Megam::Assemblies
  when MEGAM_ASSEMBLIESCOLLECTION
    Megam::AssembliesCollection
  when MEGAM_ASSEMBLY
    Megam::Assembly
  when MEGAM_ASSEMBLYCOLLECTION
    Megam::AssemblyCollection
  when MEGAM_COMPONENTS
    Megam::Components
  when MEGAM_COMPONENTSCOLLECTION
    Megam::ComponentsCollection
  when MEGAM_REQUEST
    Megam::Request
  when MEGAM_REQUESTCOLLECTION
    Megam::RequestCollection
  when MEGAM_PREDEFCLOUD
    Megam::PredefCloud
  when MEGAM_PREDEFCLOUDCOLLECTION
    Megam::PredefCloudCollection
  when MEGAM_SSHKEY
    Megam::SshKey
  when MEGAM_SSHKEYCOLLECTION
    Megam::SshKeyCollection
  when MEGAM_MARKETPLACE
    Megam::MarketPlace
  when MEGAM_MARKETPLACECOLLECTION
    Megam::MarketPlaceCollection
  when MEGAM_MARKETPLACEADDON
    Megam::MarketPlaceAddons
  when MEGAM_MARKETPLACEADDONCOLLECTION
    Megam::MarketPlaceAddonsCollection
  when MEGAM_ORGANIZATION
    Megam::Organizations
  when MEGAM_CSAR
    Megam::CSAR
  when MEGAM_CSARCOLLECTION
    Megam::CSARCollection
  when MEGAM_DOMAIN
    Megam::Domains
  else
  raise JSON::ParserError, "Unsupported `json_class` type '#{json_class}'"
  end
end

.from_json(source, opts = {}) ⇒ Object

Just call the JSON gem's parse method with a modified :max_nesting field



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# File 'lib/megam/core/json_compat.rb', line 65

def from_json(source, opts = {})
  obj = ::Yajl::Parser.parse(source)

  # JSON gem requires top level object to be a Hash or Array (otherwise
  # you get the "must contain two octets" error). Yajl doesn't impose the
  # same limitation. For compatibility, we re-impose this condition.
  unless obj.kind_of?(Hash) or obj.kind_of?(Array)
    raise JSON::ParserError, "Top level JSON object must be a Hash or Array. (actual: #{obj.class})"
  end

  # The old default in the json gem (which we are mimicing because we
  # sadly rely on this misfeature) is to "create additions" i.e., convert
  # JSON objects into ruby objects. Explicit :create_additions => false
  # is required to turn it off.
  if opts[:create_additions].nil? || opts[:create_additions]
    map_to_rb_obj(obj)
  else
  obj
  end
end

.map_hash_to_rb_obj(json_hash) ⇒ Object 



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# File 'lib/megam/core/json_compat.rb', line 107

def map_hash_to_rb_obj(json_hash)
  json_hash.each do |key, value|
    json_hash[key] = map_to_rb_obj(value)
  end
  json_hash
end

.map_to_rb_obj(json_obj) ⇒ Object

Look at an object that's a basic type (from json parse) and convert it to an instance of Megam classes if desired.



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# File 'lib/megam/core/json_compat.rb', line 88

def map_to_rb_obj(json_obj)

  case json_obj
  when Hash
    mapped_hash = map_hash_to_rb_obj(json_obj)

    if json_obj.has_key?(JSON_CLAZ) && (class_to_inflate = class_for_json_class(json_obj[JSON_CLAZ]))
    class_to_inflate.json_create(mapped_hash)

    else
    mapped_hash
    end
  when Array
    json_obj.map {|e| map_to_rb_obj(e)}
  else
  json_obj
  end
end

.opts_add_max_nesting(opts) ⇒ Object

Increase the max nesting for JSON, which defaults to 19, and isn't enough for some (for example, a Node within a Node) structures.



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# File 'lib/megam/core/json_compat.rb', line 56

def opts_add_max_nesting(opts)
  if opts.nil? || !opts.has_key?(:max_nesting)
    opts = opts.nil? ? Hash.new : opts.clone
    opts[:max_nesting] = JSON_MAX_NESTING
  end
  opts
end

.to_json(obj, opts = nil) ⇒ Object 



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# File 'lib/megam/core/json_compat.rb', line 114

def to_json(obj, opts = nil)
  obj.to_json(opts_add_max_nesting(opts))
end

.to_json_pretty(obj, opts = nil) ⇒ Object 



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# File 'lib/megam/core/json_compat.rb', line 118

def to_json_pretty(obj, opts = nil)
  ::JSON.pretty_generate(obj, opts_add_max_nesting(opts))
end