forked from mirah/mirah
/
datastore.rb
375 lines (322 loc) · 9.61 KB
/
datastore.rb
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module AppEngine
class DubyDatastorePlugin
@models = {}
TypeMap = {
'Category' => 'String',
'Email' => 'String',
'Link' => 'String',
'PhoneNumber' => 'String',
'PostalAddress' => 'String',
'Text' => 'String',
'Blob' => 'byte[]',
'ShortBlob' => 'byte[]',
'Rating' => 'int',
'Long' => 'long',
'Double' => 'double',
'Boolean' => 'boolean'
}
Primitives = ['Long', 'Double', 'Boolean', 'Rating']
Boxes = {
'int' => 'Integer',
'boolean' => 'Boolean',
'long' => 'Long',
'double' => 'Double',
}
Defaults = {
'Rating' => '0',
'Long' => 'long(0)',
'Double' => '0.0',
'Boolean' => 'false',
'Blob' => 'byte[].cast(nil)',
'ShortBlob' => 'byte[].cast(nil)',
}
Conversions = {
'Category' => 'getCategory',
'Email' => 'getEmail',
'Link' => 'getValue',
'PhoneNumber' => 'getNumber',
'PostalAddress' => 'getAddress',
'Text' => 'getValue',
'Blob' => 'getBytes',
'ShortBlob' => 'getBytes',
'Long' => 'longValue',
'Double' => 'doubleValue',
'Boolean' => 'booleanValue',
'Rating' => 'getRating',
}
class ModelState
include Mirah::AST
attr_reader :kind, :query, :read, :save, :transformer
def initialize(transformer, klass, parent, position, ast)
@transformer = transformer
@kind = klass.name.split('.')[-1]
init_query(klass.name, parent, position, ast)
init_static(parent, ast)
init_read(parent, position, ast)
init_save(parent, position, ast)
end
def init_query(classname, parent, position, ast)
name = "#{classname}$Query"
@query = ClassDefinition.new(parent, position, name) do |classdef|
queryinit = <<-EOF
def initialize; end
def kind
"#{kind}"
end
def first
it = _prepare.asIterator
if it.hasNext
e = Entity(it.next)
m = #{kind}.new
m._read_from(e)
m
else
#{kind}(nil)
end
end
def run
entities = _prepare.asList(_options)
models = #{kind}[entities.size]
it = entities.iterator
i = 0
while (it.hasNext)
e = Entity(it.next)
m = #{kind}.new
m._read_from(e)
models[i] = m
i += 1
end
models
end
def sort(name:String)
sort(name, false)
end
def sort(name:String, descending:boolean)
_sort(name, descending)
self
end
EOF
[Mirah::AST.type(nil, 'com.google.appengine.ext.duby.db.DQuery'),
eval(classdef, queryinit)]
end
ast << @query
end
def init_read(parent, position, ast)
@read = eval(parent, <<-EOF)
def _read_from(e:Entity)
self.entity = e
nil
end
EOF
ast << @read
get_properties = eval(parent, <<-EOF)
def properties
result = super()
nil
result
end
EOF
@get_properties = get_properties.body.children[1] =
Mirah::AST::Body.new(get_properties.body, position)
ast << get_properties
update = eval(parent, <<-EOF)
def update(properties:Map)
nil
self
end
EOF
@update = update.body.children[0] = Body.new(update.body, position) {[]}
ast << update
end
def init_save(parent, position, ast)
@save = eval(parent, <<-EOF)
def _save_to(e:Entity)
end
EOF
@save.body = Body.new(@save, position) {[]}
ast << @save
end
def init_static(parent, ast)
# TODO These imports don't work any more. Figure out how to fix that.
scope = ast.static_scope
package = "#{scope.package}." unless scope.package.empty?
scope.import('java.util.Map', 'Map')
scope.import("#{package}#{kind}$Query", "#{kind}__Query__")
%w( Entity Blob Category Email GeoPt IMHandle Key
Link PhoneNumber PostalAddress Rating ShortBlob
Text KeyFactory EntityNotFoundException ).each do |name|
scope.import("com.google.appengine.api.datastore.#{name}", name)
end
ast << eval(parent, <<-EOF)
def initialize
super
end
def initialize(key_name:String)
super
end
def initialize(parent:Model)
super
end
def initialize(parent:Key)
super
end
def initialize(parent:Model, key_name:String)
super
end
def initialize(parent:Key, key_name:String)
super
end
def self.get(key:Key)
begin
m = #{kind}.new
m._read_from(Model._datastore.get(key))
m
rescue EntityNotFoundException
nil
end
end
def self.get(key_name:String)
get(KeyFactory.createKey("#{kind}", key_name))
end
def self.get(id:long)
get(KeyFactory.createKey("#{kind}", id))
end
def self.get(parent:Key, key_name:String)
get(KeyFactory.createKey(parent, "#{kind}", key_name))
end
def self.get(parent:Key, id:long)
get(KeyFactory.createKey(parent, "#{kind}", id))
end
def self.get(parent:Model, key_name:String)
get(KeyFactory.createKey(parent.key, "#{kind}", key_name))
end
def self.get(parent:Model, id:long)
get(KeyFactory.createKey(parent.key, "#{kind}", id))
end
def self.all
#{kind}__Query__.new
end
EOF
end
def eval(parent, src)
transformer.eval(src, __FILE__, parent)
end
def extend_query(code)
query.body << eval(query.body, code)
end
def extend_update(code)
@update << eval(@update, code)
end
def extend_get_properties(code)
@get_properties << eval(@get_properties, code)
end
def extend_read(code)
code = 'e=nil;' + code
eval(read.body, code).children[1..-1].each do |node|
read.body << node
end
end
def extend_save(code)
code = 'e=nil;' + code
eval(save.body, code).children[1..-1].each do |node|
save.body << node
end
end
end
def self.find_class(node)
node = node.parent until Mirah::AST::ClassDefinition === node
node
end
def self.to_datastore(type, value)
if Primitives.include?(type)
"#{type}.new(#{value})"
elsif TypeMap.include?(type)
"(#{value} ? #{type}.new(#{value}) : nil)"
else
value
end
end
def self.from_datastore(type, value)
duby_type = TypeMap[type]
if duby_type
default = Defaults.fetch(type, "#{duby_type}(nil)")
conversion = Conversions[type]
"(#{value} ? #{type}(#{value}).#{conversion} : #{default})"
else
"#{type}(#{value})"
end
end
def self.add_property(name, type, transformer, fcall)
if transformer.state != @state
reset
@state = transformer.state
end
parent = fcall.parent
name = name.literal
type = type.name
type = 'Long' if type == 'Integer'
result = Mirah::AST::ScopedBody.new(parent, fcall.position) {[]}
result.static_scope = fcall.scope.static_scope
klass = find_class(parent)
unless @models[klass]
@models[klass] = ModelState.new(
transformer, klass, parent, fcall.position, result)
end
model = @models[klass]
duby_type = TypeMap.fetch(type, type)
coercion = "coerce_" + duby_type.downcase.sub("[]", "s")
if duby_type == 'List'
model.extend_query(<<-EOF)
def #{name}(value:Object)
returns :void
_query.addFilter("#{name}", _eq_op, value)
end
EOF
else
model.extend_query(<<-EOF)
def #{name}(value:#{duby_type})
returns :void
_query.addFilter("#{name}", _eq_op, #{to_datastore(type, 'value')})
end
EOF
end
temp = transformer.tmp
model.extend_read(<<-EOF)
#{temp} = e.getProperty("#{name}")
@#{name} = #{from_datastore(type, temp)}
EOF
model.extend_save(<<-EOF)
e.setProperty("#{name}", #{to_datastore(type, '@' + name)})
EOF
model.extend_update(<<-EOF)
self.#{name} = properties.get("#{name}") if properties.containsKey("#{name}")
EOF
model.extend_get_properties(<<-EOF)
result.put("#{name}", #{maybe_box(duby_type, 'self.' + name)})
EOF
result << model.eval(parent, <<-EOF)
def #{name}
@#{name}
end
def #{name}=(value:#{duby_type})
@#{name} = value
end
def #{name}=(value:Object)
self.#{name} = #{coercion}(value)
end
EOF
result
end
def self.maybe_box(duby_type, value)
if Boxes.include?(duby_type)
"#{Boxes[duby_type]}.valueOf(#{value})"
else
value
end
end
def self.reset
@models = {}
end
end
::Mirah.plugins << DubyDatastorePlugin
end