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Basic relationships
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public class Location implements Serializable{ // Other properties omitted private Address address = new Address(); // Other getter/setters methods omitted /** * @hibernate.component */ public Address getAddress() { return address; } public void setAddress(Address address) { this.address = address; } }
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The Address component is declared, almost as if it were a many-to-one relationship. Rerun the Ant generate-hbm target and check out the Location.hbm.xml file. Look for the Address component and you should see the following fragment:
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<component name="address" class="com.manning.hq.ch09.Address" > <property name="streetAddress" type="java.lang.String" update="true" insert="true" access="property" column="street_address" /> <property name="city" type="java.lang.String" update="true" insert="true" access="property" column="city"
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Hibernating with XDoclet
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/> <!-- Other properties omitted --> </component>
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This fragment shows that XDoclet has combined the property information from Address and the component declaration from Location into a single Location.hbm.xml mapping file. For an investment of three lines of documentation, we get an approximately 18-line return (excluding whitespace), so how s that for ROI And consider the time savings if three or four classes used this component. Each one would only need to declare the @hibernate.component tag and would have all the same property information generated.
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Multiples components on a single class
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One of the things you may have noticed from the previous example is that the column information is stored in the Address object rather than the Location object. What if your Location needed two address fields, perhaps a mailingAddress and a billingAddress You clearly can t have two city columns in a table, so do you have to resort to the hassle of handwriting the mapping file Nope. Fortunately, XDoclet provides the prefix attribute, which allows you to prefix the column names easily, allowing mailing and billing addresses to coexist peacefully alongside each other on a single Location. Modify the Location class to add the following changes:
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public class Location implements Serializable{ // Other properties omitted // Renamed from address to mailingAddress private Address mailingAddress = new Address(); // Added second component, the billingAddress property private Address billingAddress = new Address(); // Other getter/setter methods omitted. /** * @hibernate.component prefix="mailing_" */ public Address getMailingAddress() { return mailingAddress; } public void setMailingAddress(Address mailingAddress) {
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Basic relationships
this.mailingAddress = mailingAddress;} /** * @hibernate.component prefix="billing_" */ public Address getBillingAddress() { return billingAddress; } public void setBillingAddress(Address billingAddress) { this.billingAddress = billingAddress; } }
In this code, you rename one of the properties (address becomes mailingAddress) and add a second property, billingAddress, and then declare prefixes on both of these. Rerunning the Ant generatehbm target adjusts the Location.hbm.xml with the fragment below. Note that the whitespace has been rearranged a bit.
<component name="mailingAddress" class="com.manning.hq.ch09.Address" > <property name="streetAddress" type="java.lang.String" update="true" insert="true" access="property"> <column name="mailing_street_address"/> </property> <!-- Other properties omitted. --> </component> <component name="billingAddress" class="com.manning.hq.ch09.Address"> <property name="streetAddress" type="java.lang.String" update="true" insert="true" access="property"> <column name="billing_street_address"/> </property> <! Other properties omitted --> </component>
Hibernating with XDoclet
There is only one trick to getting this to work, which even caught this author off guard at first. (This trick has only been well documented in the latest 1.2.3 version of XDoclet.) You have to modify the Address class to use @hibernate.column tags, in addition to the @hibernate.property tags. Doing this allows XDoclet to prepend the prefix to each column. So looking at the Address class, take this:
/** * @hibernate.property column="street_address" */ public String getStreetAddress() { return streetAddress; }
and change it into this:
/** * @hibernate.property * @hibernate.column name="street_address" */ public String getStreetAddress() { return streetAddress; }
These two mappings are functionally the same, but only the second one allows multiple identical components for XDoclet to work.
9.4 Building collections
After discussing XDoclet s ability to generate persistent entities and basic relationships, the only major remaining piece of the puzzle to discuss is collections. The bulk of the XDoclet tags are devoted to handling collections. They are the most complicated of the relationships, and numerous variations exist. As varied as they are, the basic uses between a one-to-many set, a many-to-many list, and a map of components are all fairly similar. So here we are going to cover a simple case and leave the specifics of each association to the appendix.
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