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Accepts dynamic attribute
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public Object createDynamicElement(String name) Rejects dynamic elements throws BuildException { throw new BuildException("Element " + name + " is not supported"); } public void execute() { Enumeration enum = params.keys(); while (enum.hasMoreElements()) { String name = (String) enum.nextElement(); log(name + " = " + params.get(name)); } } }
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CHAPTER 1 9
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WRITING ANT TASKS
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The DynaTask shown in listing 19.7 implements the two methods from the DynamicConfigurator interface, setDynamicAttribute and createDynamicElement. In this example, we only support dynamic attributes by throwing a BuildException from createDynamicElement. Ant s introspection mechanism has special handling for classes which implement the DynamicConfigurator interface and hands attribute names and values to setDynamicAttribute and element names to createDynamicElement. The example DynaTask does not support arbitrarily named elements, but it easily could use a factory-style design pattern, using the element name to look up and instantiate a class instance to return. Ant populates the object returned from createDynamicElement in the same manner as all other Ant elements, even supporting nested DynamicConfigurator objects. The DynamicConfigurator capability was added to Ant just before the Ant 1.5 feature cutoff so, unfortunately, there are no tasks within Ant 1.5 that use this capability. In the future, container tasks such as <ejbjar> and <serverdeploy> will likely take advantage of this dynamic capability to allow more flexible and configurable vender extensibility without requiring the modification of core Ant tasks. XDoclet is taking advantage of DynamicConfigurator in this manner, so that it dynamically consults descriptors for implementation details on the supported subtasks.
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19.11 BUILDING A TASK LIBRARY
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Building a library of reusable tasks makes using your tasks much easier for build file writers. To consolidate tasks into a library is as simple as building a JAR of them. We recommend that you also include a properties file in your library, which allows quick mapping of build file task names to the actual implementation Java class names. We demonstrated this technique in chapter 11 using XDoclet to build the properties file dynamically from @ant.task tags in the Javadoc comments of each tag. The result is a JAR containing a properties file. Several tasks presented in this chapter are mapped using this properties file:
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simpletask=org.example.antbook.tasks.SimpleTask message=org.example.antbook.tasks.MessageTask message2=org.example.antbook.tasks.MessageTask2 enum=org.example.antbook.tasks.EnumTask fileproc=org.example.antbook.tasks.FileProcTask nested=org.example.antbook.tasks.NestedTask run=org.example.antbook.tasks.RunTask
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For this example, we did not use XDoclet, although we prefer to use it in order to save double-maintenance when new tasks get added. Our jar target is simply:
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<target name="jar" depends="compile"> <copy file="${meta.dir}/taskdef.properties" todir="${build.dir}"/>
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BUILDING A TASK LIBRARY
<jar destfile="${dist.dir}/tasks.jar" basedir="${build.dir}"/> </target>
A build file can utilize our task library easily without having to know the class names of each task. Listing 19.8 shows an example of using the library of tasks just built.
Listing 19.8 Using a task library in a build file
< xml version="1.0" > <project name="library" default="main"> <property name="tasks.jar" location="dist/tasks.jar"/> <taskdef resource="taskdef.properties" classpath="${tasks.jar}"/> <target name="usetasks"> <simpletask/> <property name="the.message" value="blue scooter"/> <message message="${the.message}"/> <property name="another.message" value="light up ahead"/> <message2>${another.message}</message2> <enum version="2.3"/> <fileproc dir="${basedir}"> <include name="**/*.java"/> </fileproc> <nested> <fileset dir="images"> <include name="**/*.gif"/> </fileset> <fileset refid="non.java.files"/> </nested> <run flag="off"> <fileset dir="." excludes="**/*.class"/> </run> </target> <target name="main" depends="usetasks"/> </project>
Defines all tasks contained within the task library
Note that only one <taskdef> is used, but all the tasks within taskdef.properties are defined and several are used in the usetasks target.
CHAPTER 1 9
WRITING ANT TASKS
19.12 SUPPORTING MULTIPLE VERSIONS OF ANT
Tasks written for previous versions of Ant should work fine in future versions of Ant 1.x (and possibly Ant 2.0), but the converse is not necessarily true. Ant s API evolves, and newer features, of course, are not supported in earlier versions. Ant developers work very hard to keep newer versions as backwards-compatible as possible, such that build files and tasks written for previous versions will still work when upgrading to a newer version of Ant. In order to write tasks that will work with, say, Ant 1.4.1 and Ant 1.5, you must avoid all newer API capabilities such as Project.setNewProperty and DynamicConfigurator. The best way to ensure compatibility is to compile your tasks with the oldest version of Ant you wish to support, and of course, test your tasks on each version to ensure all is well.
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