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Ant provides rich datatypes to work with, and it also provides the ability to reuse these datatype definitions. Each Ant datatype declaration allows an optional unique identifier, which you can refer to elsewhere these are called references. Our sample application takes full advantage of references, particularly with paths. Many tasks accept a classpath, defaulting to the one used by the executing virtual machine if one is not specified. We recommend specifying classpaths explicitly as this provides the greatest amount of control and reproducibility. We define our compile classpath with an id="compile.classpath" in this fashion:
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<path id="compile.classpath"> <pathelement location="${lucene.jar}"/> <pathelement location="${tidy.jar}"/> </path>
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There is a level of indirection going on in this example that will be explained later, but each of the properties used in <pathelement location= . > refer to the .. full path of the corresponding JAR file. This is the complete set of dependencies needed to compile our main production code. This, however, is not the full set of dependencies required for compiling and running our test code. To ensure that we compile and run against the minimum dependencies necessary, we craft several <path> declarations for use in different situations. The classpath used for testing is a superset of the one used for compilation; references allow us to reuse compile.classpath s definition in this manner: REFERENCES 79
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<path id="test.classpath"> <path refid="compile.classpath"/> <pathelement location="${junit.jar}"/> <pathelement location="${build.dir}/classes"/> <pathelement location="${build.dir}/test"/> </path>
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The refid and id attributes are available on all datatypes, which include the ones discussed in this chapter: path, fileset, patternset, filterset, and mapper. Anywhere a datatype is declared, it can have an id associated with it, even when used inside a task. It is recommended, however, that datatypes that will be reused with refid be declared as stand-alone datatypes for readability and clarity. 3.14.1 Properties and references In the Ant conceptual model, a property is not a datatype but is implicitly reusable by its name, such as ${build.dir}. While users can view properties, datatypes, and their references as independent from one another for most practical purposes, there are a couple of interesting intersections between them. Another variant of the <property> task converts a reference to its string representation. Obtaining a string representation of a path If a <path> has been dynamically constructed, being built from <pathelement location="."/> or <path refid="."/> nested elements, you can get its string .. .. representation. This can be used for displaying or passing to a spawned command through <exec> or <apply>. Here is an example of displaying:
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<path id="the.path"> <pathelement path="some.jar;another.jar"/> </path> <property name="path.string" refid="the.path"/> <echo message="path = ${path.string}"/>
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The <path> datatype resolves all relative items to their absolute paths and converts all file and path separators to the local platform, and so the result is
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[echo] path = /home/ant/some.jar: /home/ant/another.jar
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Dereferencing properties Makefile experts, and others desiring tricky variable dereferencing may be disappointed to find that Ant does not have advanced evaluation of properties. They are simply string substitutions and nesting properties does not accomplish what some may expect. For example
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<property <property <property <property name="X" name="Y" name="A" name="B" value="Y"/> value="Z"/> value="${${X}}"/> value="$${${X}}"/>
The $$ is replaced by $
UNDERSTANDING ANT DATATYPES AND PROPERTIES
<echo message="A = ${A}"/> <echo message="B = ${B}"/>
The output of the above is
[echo] A = ${${X}} [echo] B = ${Y}
It is possible, however, to accomplish this, though rarely, if ever, would this particular technique be needed in a build file. Make has a feature called computed variable names, which is similar to our first attempts at dereferencing, yet with different results. (In other words, A would have equaled Z.) Using an additional property is required as a selector:
<property name="X" value="Y" id="X.prop"/> <property name="Y" value="Z" id="Y.prop"/> <property name="selector" value="${X}"/> <property name="A" refid="${selector}.prop"/> <echo message="A = ${A}"/>
While this appears fairly straightforward, it is actually taking advantage of some fairly complex capability of Ant, that of assigning an id to a task (in this case <property>). The value of selector becomes Y, and the assignment of A uses the value of the referenced object (in this case a task) by the name of Y.prop. Avoid this kind of wackiness at almost all costs because there are much more standard and clearer ways to choose a different set of properties, such as
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