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The pattern is specified using the format described in Javadoc for java.text.SimpleDateFormat. <format> also supports locale and offsets refer to the task reference for these specifics. Creating ISO 8601 timestamp Creating a timestamp in a recognized standard format is important. We use it in our application to embed into a properties file. This build-time generated properties file is embedded into our distributables such as the web applications WAR file. The <tstamp> task can create an ISO timestamp:

In this chapter, we looked at layered applications and some important patterns and best practices. We discussed how you can design a web application with Hibernate and implement the Open Session in View pattern. You now know how to create smart domain models and how to separate business logic from controller code. The flexible Command pattern is a major asset in your software design arsenal. We looked at EJB 3.0 components and how you can further simplify a POJO application by adding a few annotations. Finally, we discussed the persistence layer extensively; you wrote data-access objects and integration tests with TestNG that exercise the persistence layer.

<tstamp> <format property="buildtime" pattern="yyyy-MM-dd'T'HH:mm:ss" /> </tstamp> <echo message="buildtime = ${buildtime}"/>

A polymorphic association is an association that may refer instances of a subclass of the class that was explicitly specified in the mapping metadata. For this example, consider the defaultBillingDetails property of User. It references one particular BillingDetails object, which at runtime can be any concrete instance of that class. The classes are shown in figure 7.13. You map this association to the abstract class BillingDetails as follows in User.hbm.xml.

<many-to-one name="defaultBillingDetails" class="BillingDetails" column="DEFAULT_BILLING_DETAILS_ID"/>

[echo] buildtime = 2002-02-09T17:17:21

But because BillingDetails is abstract, the association must refer to an instance of one of its subclasses CreditCard or CheckingAccount at runtime. You don t have to do anything special to enable polymorphic associations in Hibernate; specify the name of any mapped persistent class in your association mapping (or let Hibernate discover it using reflection), and then, if that class declares any <union-subclass>, <subclass>, or <joined-subclass> elements, the association is naturally polymorphic. The following code demonstrates the creation of an association to an instance of the CreditCard subclass:

Prefixing timestamps The <tstamp> task supports an optional prefix attribute to allow setting unique property names and avoid clashing with already-set property names. The immutability rules of Ant properties prevent overwriting the value of an already-set property, including the ones <tstamp> sets.

CreditCard cc = new CreditCard(); cc.setNumber(ccNumber); cc.setType(ccType); cc.setExpiryDate(ccExpiryDate); User user = (User) session.get(User.class, userId); user.addBillingDetails(cc); // Add it to the one-to-many association user.setDefaultBillingDetails(cc); // Complete unit of work

This sets three properties start.DSTAMP, start.TSTAMP, and start.TODAY with the same formats as the default <tstamp> usage. 3.12.8 Loading properties from an XML file Ant 1.5 includes a handy new task that pulls in properties from an XML file. Hierarchy of the XML file is preserved using dotted property notation. Here is an example of a build scenario in which our build is designed to handle customization for customers. Each customer has a corresponding XML file with specific information, such as a name and possibly some specific implementation details like a custom class name used to override default behavior. For example, Acme, Inc. s definition file, acme.xml, is

Now, when you navigate the association in a second unit of work, Hibernate automatically retrieves the CreditCard instance:

User user = (User) secondSession.get(User.class, userId); // Invoke the pay() method on the actual subclass instance user.getDefaultBillingDetails().pay(amount);

<customer name="Acme, Inc."> <settings> <impl>org.example.antbook.acme.SomeClass</impl> </settings> </customer>

There is just one thing to watch out for: If BillingDetails was mapped with lazy="true" (which is the default), Hibernate would proxy the defaultBillingDetails association target. In this case, you wouldn t be able to perform a typecast to the concrete class CreditCard at runtime, and even the instanceof operator would behave strangely:

The <xmlproperty> traverses the XML file, creating properties for element and attribute data as it goes. Our build file can use this information easily:

User user = (User) session.get(User.class, userid); BillingDetails bd = user.getDefaultBillingDetails(); System.out.println( bd instanceof CreditCard ); // Prints "false" CreditCard cc = (CreditCard) bd; // ClassCastException!

<project name="xmlprops" default="main"> <target name="main"> <property name="customer" value="acme"/> <xmlproperty file="${customer}.xml"/> <echo message="Building for ${customer(name)}..."/> <echo level="verbose"> classname = ${customer.settings.impl} </echo> </target> </project>

In this code, the typecast fails because bd is a proxy instance. When a method is invoked on the proxy, the call is delegated to an instance of CreditCard that is fetched lazily (it s an instance of a runtime-generated subclass, so instanceof also fails). Until this initialization occurs, Hibernate doesn t know what the subtype of