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Transforming flat data structures such as List or Map is pretty easy: you just take each element from the collection and return a transformed value. Transforming XML is more complex. XML contains many different types of elements. XML data is nested. A transformation may return many nodes for each transformed node. In order to deal with these complexities, Scala provides a set of classes to help with XML transformation. These helpers can be found in the scala.xml.transform package. These helpers provide O(log n) cost for transformations. That means only the nodes that are changed and the direct path from the changed nodes to the root node are changed. This is far more efficient than the O(n) cost of copying an entire XML data structure if modifying the structure will cause unexpected results. In order to transform XML, we need to create a rewrite rule. In this case, if the XML element contains the attribute instruction with the value remove, the node will be removed from the transformed XML. First, let s import the packages:

total_characters = text.length puts "#{total_characters} characters"

import scala.xml._ import scala.xml.transform._

If you ran analyzer.rb now with the Oliver Twist text, you d get output like this:

Note For the administrator user stories, we won t walk through functional and integration tests. At this

The second statistic you wanted to get relating to characters was a character total excluding whitespace. If you can remember back to 3, strings have a gsub method that performs a global substitution (like a search and replace) upon the string. For example:

Next, let s define a rule that removes the elements that have the remove instruction:

"this is a test".gsub(/t/, 'X')

You can use gsub to eradicate the spaces from your text string in the same way, and then use the length method to get the length of the newly de-spacified text. Add the following code to analyzer.rb:

birt barcode maximo, birt ean 13, birt upc-a, birt ean 128, birt code 128, birt code 39

val removeIt = new RewriteRule { override def transform(n: Node): NodeSeq = n match { case e: Elem if (e \ "@instruction").text == "remove" => NodeSeq.Empty case n => n } }

The order details page is where George can see the information about the order. He needs to check this page before he ships the books to the customer. The page will show the customer s contact information and shipping address. Furthermore, we need to display the order details in other words, the books that the customer has ordered. The credit card details are needed only by the payment gateway, and keeping them in our database would be a huge security risk. Open app/controllers/order_controller.rb and replace the empty show action with the following code: def show @page_title = "Displaying order ##{params[:id]}" @order = Order.find(params[:id]) end The action simply pulls out the specified order from the database and sets the page title. Next, create the view by saving the following code in app/views/admin/order/show.rhtml: <%= render :partial => 'navigation' %> <p> Order total $<%= @order.total %> </p> <h2>Contact Information</h2> <dl> <dt>ID</dt> <dd><%= @order.id %></dd> <dt>Email</dt> <dd><%= @order.email %></dd> <dt>Phone number</dt> <dd><%= @order.phone_number %></dd> </dl> <h2>Shipping Address</h2> <dl> <dt>First name</dt> <dd><%= @order.ship_to_first_name %></dd> <dt>Last name</dt> <dd><%= @order.ship_to_last_name %></dd> <dt>Address</dt> <dd><%= @order.ship_to_address %></dd> <dt>City</dt> <dd><%= @order.ship_to_city %></dd> <dt>Postal/Zip code</dt> <dd><%= @order.ship_to_postal_code %></dd> <dt>Country</dt> <dd><%= @order.ship_to_country %></dd> </dl>

total_characters_nospaces = text.gsub(/\s+/, '').length puts "#{total_characters_nospaces} characters excluding spaces"

The RewriteRule overrides the transform method and pattern matches against an element that contains the remove instruction. If the pattern is matched, an empty node is returned. Otherwise the method returns the unmodified node. Let s create some test data:

If you run analyzer.rb in its current state against the Oliver Twist text, the results should be similar to the following:

121 lines 6165 characters 5055 characters (excluding spaces)

val xmlBooks = <books instruction="update"> <book instruction="remove" name="book1" status=""/> <book instruction="add" name="book2" status=""/> </books>

<h2>Order Details</h2> <% for item in @order.order_items %> <%= link_to item.book.title, :action => "show", :controller => "catalog", :id => item.book.id %> <%= pluralize(item.amount, "pc", "pcs") %>, $<%= item.price * item.amount %></br> <% end %> <p> <%= button_to "Close Order", :action => 'close', :id => @order unless @order.closed %> </p> At the top of the page, we show the navigation and order total. Next, we show the contact information, shipping address, and order details sections. At the bottom, we display a button that allows George to close the order, but only if the order hasn t been closed already, which is checked by calling the closed method on the Order model. Note that the page will generate an error until we have added the code shown here to the Order model (app/models/order.rb): def closed status == 'closed' end Let s perform an acceptance test. Click the View button from the view orders page (shown in Figures 9-13 and 9-14). You should now see the order details, as shown in Figure 9-15.

The regular expression looks odd here, but the full stop, question mark, and exclamation mark are clearly visible. Let s look at the regular expression directly:

/\.|\ |!/