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id/refid attributes. Nested datatypes implicitly support references using refid, so
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your task code does not need to explicitly add this support. We do not cover writing custom datatypes in this book, as it s not commonly done even when writing custom tasks. Refer to Ant s source code for examples on writing custom datatypes. Note that if you are trying to import references to a custom datatype, your task and datatype must be loaded by the same classloader. This happens automatically if you place the JAR files into Ant s lib directory. If you are specifying a classloader in the <taskdef> and <datatype> declarations, then you must set the loaderref attribute to the same classloader reference in all your declarations. 19.3.4 Allowing free-form body text For some tasks, the constraints of XML attribute and element structure is too rigid. It could be prohibitive to require users of your task to work around the character-escaping issues required within attribute values. For example, to use the <echo> task to display 6 < 9 using the message attribute requires entity reference use. This is illegal XML:
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<echo message="6 < 9"/>
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It produces the following output:
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>ant echo-example Buildfile: build.xml BUILD FAILED build.xml:81: Use "<" for "<" in attribute values.
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Modifying the build file to use entity references, <echo> now works as expected, but is not as easily read by humans:
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<echo message="6 < 9"/>
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Indeed this would be a major headache if we had to entity-reference encode, for example, a block of SQL commands. Fortunately, this is easily overcome by allowing tasks access to the element text. Adding an addText method to your task instructs Ant to allow elements to contain textual body either directly or inside a CDATA section (see appendix B for more details on CDATA and XML syntax). The <echo> task supports body text, and our example is better specified using CDATA instead:
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<echo><![CDATA[ 6 < 9 ]]></echo>
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In this case CDATA is needed because the < character is still illegal in element body text unless inside a CDATA section. It is important to note that Ant properties are not expanded automatically before calling addText. We demonstrate the use of addText in section 19.4.2 as well as how to have properties expanded if desired.
CHAPTER 1 9
WRITING ANT TASKS
CREATING A BASIC ANT TASK SUBCLASS
Our tasks from now on will extend from org.apache.tools.ant.Task. The primary reason for subclassing from Task is to gain access to Ant s internal APIs. The Task class provides the following: Access to the containing target Access to the current project Logging facilities A class that does not extend from Task can still gain access to the project instance and logging facilities through that instance by implementing a setProject method:
public void setProject (org.apache.tools.ant.Project project)
This makes extending from Task unnecessary for all practical purposes. The best reason not to do so would be to avoid a dependency on Ant from your class, as well as to keep your own inheritance hierarchy. But if you are going to have a setProject method, you ve already created an Ant dependency. As for the argument of keeping your own inheritance hierarchy, we recommend encapsulating your other Java classes inside a Task subclass; this acts as a wrapper and allows you to change the inner workings of your encapsulated code and keep the task and build file interface unchanged. 19.4.1 Adding an attribute to a task In keeping with our recommendations, here is a basic Ant task that extends from Task. It also demonstrates an optional attribute:
package org.example.antbook.tasks; import org.apache.tools.ant.Task; public class MessageTask extends Task { private String message = ""; public void setMessage(String message) { this.message = message; } public void execute() { log(message); } }
Use it in a build file like this:
<target name="messagetask" depends="compile"> <taskdef name="message" classname="org.example.antbook.tasks.MessageTask"
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