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Application configuration XML files Deployment configuration XML files Application configuration XML files Deployment configuration XML files XML DTD

<collection-id type="long" column="ITEM_IMAGE_ID"> <generator class="sequence"/> </collection-id> <key column="ITEM_ID"/> <element type="string" column="FILENAME" not-null="true"/> </idbag>

Figure 13.1 When XML files are validated: before and after adding <xmlvalidate> to the build. Errors show up earlier, which is what we want.

The linked collections Hibernate uses internally for sets and maps are available only in JDK 1.4 or later; older JDKs don t come with a LinkedHashMap and LinkedHashSet. Ordered bags are available in all JDK versions; internally, an ArrayList is used. In a real system, it s likely that you ll need to keep more than just the image name and filename. You ll probably need to create an Image class for this extra information. This is the perfect use case for a collection of components.

One of Ant s optional tasks can save time and headaches by validating XML at build time rather than at deploy time. The <xmlvalidate> task is straightforward: give it the name of an XML file and it will validate it, or give it a <fileset> and it will

You could map Image as an entity class and create a one-to-many relationship from Item to Image. However, this isn t necessary, because Image can be modeled as a value type: Instances of this class have a dependent lifecycle, don t need their own identity, and don t have to support shared references. As a value type, the Image class defines the properties name, filename, sizeX, and sizeY. It has a single association with its owner, the Item entity class, as shown in figure 6.5. As you can see from the composition association style (the black diamond), Image is a component of Item, and Item is the entity that is responsible for the lifecycle of Image instances. The multiplicity of the association further declares this association as many-valued that is, many (or zero) Image instances for the same Item instance. Let s walk through the implementation of this in Java and through a mapping in XML.

name : String description : String initialPrice : BigDecimal reservePrice : BigDecimal startDate : Date endDate : Date state : ItemState approvalDatetime : Date

At the time of writing it was being debated whether to include Xalan with the Ant 1.5 distribution. It is likely that it will be included in the final release, so check before installing it yourself.

First, implement the Image class as a regular POJO. As you know from chapter 4, component classes don t have an identifier property. You must implement equals() (and hashCode()) and compare the name, filename, sizeX, and sizeY properties. Hibernate relies on this equality routine to check instances for modifications. A custom implementation of equals() and hashCode() isn t required for all component classes (we would have mentioned this earlier). However, we recommend it for any component class because the implementation is straightforward, and better safe than sorry is a good motto. The Item class may have a Set of images, with no duplicates allowed. Let s map this to the database.

validate many files in one pass. To validate our Struts configuration, we write a target to run it against our struts-config.xml file:

Collections of components are mapped similarly to collections of JDK value type. The only difference is the use of <composite-element> instead of an <element> tag. An ordered set of images (internally, a LinkedHashSet) can be mapped like this:

<target name="validate-struts-config"> <xmlvalidate warn="false" file="web/WEB-INF/struts-config.xml"/> </target>

<set name="images" table="ITEM_IMAGE" order-by="IMAGENAME asc"> <key column="ITEM_ID"/> <composite-element class="Image"> <property name="name" column="IMAGENAME" not-null="true"/> <property name="filename" column="FILENAME" not-null="true"/> <property name="sizeX" column="SIZEX" not-null="true"/> <property name="sizeY" column="SIZEY" not-null="true"/> </composite-element> </set>

Our Struts config file begins with a declaration of the DTD, so as well as being able to verify that the file is well formed, the task can validate it against the DTD: