class ActiveRecord::ConnectionAdapters::SchemaCache

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 7
def initialize(conn)
  @connection = conn

  @columns      = {}
  @columns_hash = {}
  @primary_keys = {}
  @tables       = {}
end

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 29
def add(table_name)
  if table_exists?(table_name)
    primary_keys(table_name)
    columns(table_name)
    columns_hash(table_name)
  end
end

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 55
def clear!
  @columns.clear
  @columns_hash.clear
  @primary_keys.clear
  @tables.clear
  @version = nil
end

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 70
def clear_table_cache!(table_name)
  @columns.delete table_name
  @columns_hash.delete table_name
  @primary_keys.delete table_name
  @tables.delete table_name
end

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 42
def columns(table_name)
  @columns[table_name] ||= connection.columns(table_name)
end

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 48
def columns_hash(table_name)
  @columns_hash[table_name] ||= Hash[columns(table_name).map { |col|
    [col.name, col]
  }]
end

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 77
def marshal_dump
  # if we get current version during initialization, it happens stack over flow.
  @version = ActiveRecord::Migrator.current_version
  [@version, @columns, @columns_hash, @primary_keys, @tables]
end

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 83
def marshal_load(array)
  @version, @columns, @columns_hash, @primary_keys, @tables = array
end

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 16
def primary_keys(table_name)
  @primary_keys[table_name] ||= table_exists?(table_name) ? connection.primary_key(table_name) : nil
end

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 63
def size
  [@columns, @columns_hash, @primary_keys, @tables].map { |x|
    x.size
  }.inject :+
end

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 21
def table_exists?(name)
  prepare_tables if @tables.empty?
  return @tables[name] if @tables.key? name

  @tables[name] = connection.table_exists?(name)
end

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 37
def tables(name)
  @tables[name]
end