lib/app_info/file.rb in app-info-3.0.0.beta1 vs lib/app_info/file.rb in app-info-3.0.0.beta2

@@ -8,16 +8,42 @@
     def initialize(file, logger: AppInfo.logger)
       @file = file
       @logger = logger
     end
 
-    # @abstract Subclass and override {#file_type} to implement
-    def file_type
-      Platform::UNKNOWN
+    # @return [Symbol] {Format}
+    def format
+      @format ||= lambda {
+        if instance_of?(AppInfo::File) || instance_of?(AppInfo::Apple) ||
+           instance_of?(AppInfo::Android)
+          not_implemented_error!(__method__)
+        end
+
+        self.class.name.split('::')[-1].downcase.to_sym
+      }.call
     end
 
+    # @abstract Subclass and override {#opera_system} to implement.
+    def opera_system
+      not_implemented_error!(__method__)
+    end
+
+    # @abstract Subclass and override {#platform} to implement.
+    def platform
+      not_implemented_error!(__method__)
+    end
+
+    # @abstract Subclass and override {#device} to implement.
+    def device
+      not_implemented_error!(__method__)
+    end
+
     # @abstract Subclass and override {#size} to implement
     def size(human_size: false)
-      raise NotImplementedError, ".#{__method__} method implantation required in #{self.class}"
+      not_implemented_error!(__method__)
+    end
+
+    def not_implemented_error!(method)
+      raise NotImplementedError, ".#{method} method implantation required in #{self.class}"
     end
   end
 end