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Table 9.3 Subprojects within our example project. The EJB project is still on the list of things to do. Child project Common Tools Ant Index Webapp EJB Deliverables Common libraries Utility classes Ant task <index> Ant documentation index Web application EJB classes and EAR file

The composition between User and Address is a metadata-level notion; you only have to tell Hibernate that the Address is a value type in the mapping document or with annotations. Component mapping in XML Hibernate uses the term component for a user-defined class that is persisted to the same table as the owning entity, an example of which is shown in listing 4.2. (The use of the word component here has nothing to do with the architecturelevel concept, as in software component.)

<class name="User" table="USER"> <id name="id" column="USER_ID" type="long"> <generator class="native"/> </id> <property name="loginName" column="LOGIN" type="string"/> <component name="homeAddress" class="Address"> <property name="street" type="string" column="HOME_STREET" not-null="true"/> <property name="city" type="string" column="HOME_CITY" not-null="true"/>

Some of these projects depend upon other projects just as in a build file, targets can depend upon other targets It would be nice to be able to declare in a master build how these Ant projects were interdependent, so that this tool could then build the projects in the appropriate order Ant does not integrate subprojects so seamlessly, but it does make it possible to write a master build file that can call the subprojects in the order that the file s authors specify, with significant control over these invoked builds The key to this is the <ant> task 942 Introducing the <ant> task We covered the <antcall> task in chapter 7 As you may recall, it lets you call a target inside the current build file with a different set of properties.

<component name="billingAddress" class="Address"> <property name="street" type="string" column="BILLING_STREET" not-null="true"/> <property name="city" type="string" column="BILLING_CITY" not-null="true"/> <property name="zipcode" type="string" column="BILLING_ZIPCODE" not-null="true"/> </component> ... </class>

The <ant> task is almost identical except that it also allows you to specify the build file that contains the target This enables you to divide your build file into subprojects; one for each of the child projects of the actual software project It also enables you to write library build files These are build files that contain reusable targets to perform standard actions, such as incrementing a build counter or deploying to a web server The basic functionality of the <ant> task is simple: you use it to call any target in any other build file, passing in properties and references if you desire When you call a target with it, you implicitly invoke any other target in the build file that the invoked target depends upon.

You declare the persistent attributes of Address inside the <component> element. The property of the User class is named homeAddress. You reuse the same component class to map another property of this type to the same table. Figure 4.3 shows how the attributes of the Address class are persisted to the same table as the User entity. Notice that, in this example, you model the composition association as unidirectional. You can t navigate from Address to User. Hibernate supports both unidirectional and bidirectional compositions, but unidirectional composition is far more common. An example of a bidirectional mapping is shown in listing 4.3.

Example: a basic master build file With all our projects laid out under a single main directory (app), we can create a basic master build file that calls the targets Listing 91 shows a master build file that will build five subprojects..

<component name="homeAddress" class="Address"> <parent name="user"/> <property name="street" type="string" column="HOME_STREET" not-null="true"/> <property name="city" type="string" column="HOME_CITY" not-null="true"/> <property name="zipcode" type="stringshort" column="HOME_ZIPCODE" not-null="true"/> </component>

< xml version="1.0" > <project name="Master <target name="all" <ant dir="ant" <ant dir="common" <ant dir="tools" Build" default="all"> description="Build everything"> inheritAll="false"/> inheritAll="false"/> inheritAll="false"/>

In listing 4.3, the <parent> element maps a property of type User to the owning entity, which in this example is the property named user. You can then call Address.getUser() to navigate in the other direction. This is really a simple back-pointer. A Hibernate component can own other components and even associations to other entities. This flexibility is the foundation of Hibernate s support for finegrained object models. For example, you can create a Location class with detailed information about the home address of an Address owner:

<component name="homeAddress" class="Address"> <parent name="user"/> <component name="location" class="Location"> <property name="streetname" column="HOME_STREETNAME"/> <property name="streetside" column="HOME_STREETSIDE"/> <property name="housenumber" column="HOME_HOUSENR"/> <property name="floor" column="HOME_FLOOR"/> </component> <property name="city" type="string" column="HOME_CITY"/> <property name="zipcode" type="string" column="HOME_ZIPCODE"/> </component>