code: public static <T extends Geometry> GeometryExpression<T> asGeometry(Expression<T> expr) {
          Expression<T> underlyingMixin = ExpressionUtils.extract(expr);
          if (underlyingMixin instanceof PathImpl) {
              return new GeometryPath<T>((PathImpl<T>) underlyingMixin);
          } else if (underlyingMixin instanceof OperationImpl) {
              return new GeometryOperation<T>((OperationImpl<T>) underlyingMixin);
          } else {
              return new GeometryExpression<T>(underlyingMixin) {
  
                  private static final long serialVersionUID = -6714044005570420009L;
  
                  @Override
                  public <R, C> R accept(Visitor<R, C> v, C context) {
                      return this.mixin.accept(v, context);
                  }
  
              };
          }
      }
docs: Create a new GeometryExpression
  
  @param expr Expression of type Geometry
  @return new GeometryExpression