lib/sparql/algebra/expression.rb in sparql-1.1.6 vs lib/sparql/algebra/expression.rb in sparql-1.1.7

@@ -118,11 +118,11 @@
           else raise TypeError, "invalid SPARQL::Algebra::Expression operand: #{operand.inspect}"
         end
       end
 
       debug(options) {"#{operator.inspect}(#{operands.map(&:inspect).join(',')})"}
-      options.delete_if {|k, v| [:debug, :depth, :prefixes, :base_uri, :update].include?(k) }
+      options.delete_if {|k, v| [:debug, :depth, :prefixes, :base_uri, :update, :validate].include?(k) }
       operands << options unless options.empty?
       operator.new(*operands)
     end
 
     ##
@@ -315,10 +315,36 @@
     # @return [Array] `self`
     # @see    http://openjena.org/wiki/SSE
     def to_sxp_bin
       self
     end
-    
+
+    ##
+    # Is this value valid, and composed only of valid components?
+    #
+    # @return [Boolean] `true` or `false`
+    def valid?
+      true
+    end
+
+    ##
+    # Is this value invalid, or is it composed of any invalid components?
+    #
+    # @return [Boolean] `true` or `false`
+    def invalid?
+      !valid?
+    end
+
+    ##
+    # Default validate! implementation, overridden in concrete classes
+    # @return [SPARQL::Algebra::Expression] `self`
+    # @raise  [ArgumentError] if the value is invalid
+    def validate!
+      raise ArgumentError if invalid?
+      self
+    end
+    alias_method :validate, :validate!
+
     private
     # @overload: May be called with node, message and an option hash
     #   @param [String] node processing node
     #   @param [String] message
     #   @param [Hash{Symbol => Object}] options