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9.1.4 Configuring Ant
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So far, we have glossed over the details of how XDoclet actually processes the files. XDoclet works strictly at build time. In fact, the only way to use XDoclet is as a part of an Ant build process. You ll need to create targets and tasks in your build.xml file to instruct it to process the Java files and then generate the hbm.xml files. Go ahead and make a copy of the build.xml file we have been working with in the previous few chapters, this time naming it build09.xml. Modify it to look like so:
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<project name="build09.xml" default="build"> <property name="src.java.dir" value="src/java"/> <property name="build.classes.dir" value="build/classes"/> <!-- Other properties excluded --> Defines the location where XDoclet is installed <import file="hibernate-build.xml"/> <property name="xdoclet.version" value="1.2.3"/> <property name="xdoclet.lib.dir" value="${applications.dir}/xdoclet-${xdoclet.version}"/> <path id="xdoclet.lib.path"> Creates a path <fileset dir="${xdoclet.lib.dir}\lib"> element for XDoclet <include name="**/*.jar"/> </fileset> </path> <path id="project.classpath"> <pathelement location="${build.classes.dir}"/> </path> <path id="runtime.classpath"> <path refid="project.classpath"/>
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Essential XDoclet
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Adds XDoclet to <path refid="hibernate.lib.path"/> the classpath <path refid="xdoclet.lib.path"/> <pathelement location="${jdbc.driver.jar}"/> <pathelement location="${src.java.dir}"/> </path> <!-- Other attributes excluded --> <target name="generate-hbm" depends="compile"> <taskdef Defines the Hibernate Doclet task name="hibernatedoclet" classname="xdoclet.modules.hibernate.HibernateDocletTask" classpathref="runtime.classpath" /> Specifies the output directory for the <hibernatedoclet .hbm.xml files destdir="${build.classes.dir}" verbose="true"> <fileset dir="${src.java.dir}"> <include name="**/*.java"/> </fileset> <hibernate version="3.0"/> </hibernatedoclet> </target> </project> Contains location of the Java files, parsing all of them
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(We left out a few of the attributes and tasks from the overall build file to highlight the new additions.) Overall, you do quite a few things with this code. You add XDoclet to the classpath by defining the location where you installed it. By making the xdoclet.version a property, you make it easy to upgrade to a new version. You define a path element, xdoclet.lib.path, which includes all the XDoclet JARs and dependencies. Finally, you define a new Ant task, called hibernatedoclet, which will be used to generate the .hbm files. Running this task from the command line yields the following:
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$ant f build09.xml generate-hbm Buildfile: build09.xml init: compile: generate-hbm:
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Hibernating with XDoclet
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[hibernatedoclet](XDocletMain.start 47 ) Running <hibernate/> [hibernatedoclet] Generating mapping file for com.manning.hq.ch09.Event. [hibernatedoclet] com.manning.hq.ch09.Event BUILD SUCCESSFUL Total time: 4 seconds
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As you notice, the task processed a single Java class, your Event class, and generates its mapping file. If you look in the build/classes directory, you should find an Event.hbm.xml file sitting along with the compiled Event.class. You can add Event to your SessionFactory now and persist classes just as if you wrote the Event.hbm.xml file by hand. And as you can see by looking at Event.java, the Hibernate tags you added make the purpose and intent of the class a bit clearer. So you have reduced the number of files that future developers (which may include you) need to read and comprehend, as well as documenting the files they do read.
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9.2 Making single objects persistent
So far we have covered a basic example of how XDoclet works. Let s take a step back and look at what mapping elements Hibernate requires to make a class persistent. Generally, each Hibernate element has a corresponding XDoclet tag that generates it. This section covers four of the basic tags you need to make a single class persistent: @class, @id, @property, and @column. Each of these tags has its own set of allowable properties, which you ll likely need to configure; some of them have very reasonable defaults. What follows is not an exhaustive list but just a listing of properties that you may need to use. For complete tag details, check the documentation that comes with XDoclet.1
The Hibernate tag documentation is in that docs directory we pointed out in section 9.1.
Making single objects persistent
9.2.1 The @hibernate.class tag
The @hibernate.class tag has quite a few properties (many of which you will use when we start discussing polymorphism and subclasses), but table 9.1 shows the one that s commonly used.
Table 9.1 A common @hibernate.class attribute Attribute table Description Contains the name of the table where instances of this class will be persisted to. Default The unqualified name of the class.
Tags are valid only when placed in certain spots. In this case, you put this tag only in the class-level JavaDoc comments. It would be meaningless to put it on a method, for example. Note that while the table attribute isn t mandatory, we also recommend specifying it for the sake of clarity (and because database and Java naming conventions differ a bit). Also, for the class-based tags, be sure the JavaDoc comments are right before the class declaration. If you put a class-based tag in the wrong place, XDoclet will silently do nothing and leave you frustrated and confused. For example, don t do this:
/** * Don't do this! Class tags can't appear before the * package statement. * @hibernate.class */ package com.manning.hq.ch09; public class Event implements Serializable { }
Many classes have a big block of comments appear at the beginning of the file, which is fine. But if you want XDoclet to parse them, be sure to put the JavaDoc right up next to the class declaration like so:
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