code: public ClassNode buildMapType(ClassNode keyType, ClassNode valueType) {
          return parameterizedType(ClassHelper.MAP_TYPE, keyType, valueType);
      }
docs: Builds a parametrized class node representing the Map&lt;keyType,valueType&gt; type.
  @param keyType the classnode type of the key
  @param valueType the classnode type of the value
  @return a class node for Map&lt;keyType,valueType&gt;
  @since 2.2.0