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example from Cedric Beust's blog http://beust.com/weblog/archives/000181.html with a conversion to groovy from Sam Pullara git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@276870 13f79535-47bb-0310-9956-ffa450edef68
269 lines
9.2 KiB
HTML
269 lines
9.2 KiB
HTML
<html>
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<head>
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<meta http-equiv="Content-Language" content="en-us"></meta>
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<title>Script Task</title>
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</head>
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<body>
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<h2><a name="script">Script</a></h2>
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<h3>Description</h3>
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<p>Execute a script in a
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<a href="http://jakarta.apache.org/bsf" target="_top">Apache BSF</a> supported language.</p>
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<p><b>Note:</b> This task depends on external libraries not included in the Ant distribution.
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See <a href="../install.html#librarydependencies">Library Dependencies</a> for more information.</p>
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<p>All items (tasks, targets, etc) of the running project are
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accessible from the script, using either their <code>name</code> or
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<code>id</code> attributes (as long as their names are considered
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valid Java identifiers, that is).
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The name "project" is a pre-defined reference to the Project, which can be
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used instead of the project name. The name "self" is a pre-defined reference to the actual
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<script>-Task instance.<br/>From these objects you have access to the Ant Java API, see the
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<a href="../api/index.html">JavaDoc</a> (especially for
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<a href="../api/org/apache/tools/ant/Project.html">Project</a> and
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<a href="../api/org/apache/tools/ant/taskdefs/optional/Script.html">Script</a>) for more information.</p>
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<p>If you are using JavaScript a good resource is <a target="_blank" href="http://www.mozilla.org/rhino/doc.html">
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http://www.mozilla.org/rhino/doc.html</a> as we are using their JavaScript interpreter.</p>
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<p>Scripts can do almost anything a task written in Java could do.</p>
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<p>Rhino provides a special construct - the <i>JavaAdapter</i>. With that you can
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create an object which implements several interfaces, extends classes and for which you
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can overwrite methods. Because this is an undocumented feature (yet), here is the link
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to an explanation: <a href="http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&oe=UTF-8&newwindow=1&frame=right&th=610d2db45c0756bd&seekm=391EEC3C.5236D929%40yahoo.com#link2">
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Groups@Google: "Rhino, enum.js, JavaAdapter?"</a> by Norris Boyd in the newsgroup
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<i>netscape.public.mozilla.jseng</i>.</p>
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<h3>Parameters</h3>
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<table border="1" cellpadding="2" cellspacing="0">
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<tr>
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<td valign="top"><b>Attribute</b></td>
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<td valign="top"><b>Description</b></td>
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<td align="center" valign="top"><b>Required</b></td>
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</tr>
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<tr>
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<td valign="top">language</td>
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<td valign="top">The programming language the script is written in.
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Must be a supported Apache BSF language</td>
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<td valign="top" align="center">Yes</td>
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</tr>
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<tr>
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<td valign="top">src</td>
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<td valign="top">The location of the script as a file, if not inline</td>
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<td valign="top" align="center">No</td>
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</tr>
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</table>
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<h3>Examples</h3>
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The following snippet shows use of five different languages:
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<blockquote><pre>
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<property name="message" value="Hello world"/>
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<script language="groovy">
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println("message is " + message)
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</script>
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<script language="beanshell">
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System.out.println("message is " + message);
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</script>
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<script language="judoscript">
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println 'message is ', message
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</script>
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<script language="ruby">
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print 'message is ', $message, "\n"
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</script>
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<script language="jython">
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print "message is %s" % message
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</script>
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</pre>
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</blockquote>
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<p>
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Note that for the <i>jython</i> example, the script contents <b>must</b>
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start on the first column.
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</p>
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<p>
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The following script shows a little more complicted jruby example:
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</p>
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<blockquote><pre>
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<script language="ruby">
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xmlfiles = Dir.new(".").entries.delete_if { |i| ! (i =~ /\.xml$/) }
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xmlfiles.sort.each { |i| $self.log(i) }
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</script>
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</pre>
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</blockquote>
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<p>
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Note that due to a limitation in the current version of jruby (0.7.0),
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$project.log("Hello World") does not work (most likely because there are
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two log methods on Project), this is fixed in the current CVS version of jruby.
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</p>
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<p>
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The same example in groovy is:
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</p>
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<blockquote><pre>
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<script language="groovy">
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xmlfiles = new java.io.File(".").listFiles().findAll{ it =~ "\.xml$"}
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xmlfiles.sort().each { self.log(it.toString())}
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</script>
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</pre>
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</blockquote>
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<p>
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The following script uses javascript to create a number of
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echo tasks and execute them.
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</p>
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<blockquote><pre>
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<project name="squares" default="main" basedir=".">
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<target name="main">
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<script language="javascript"> <![CDATA[
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for (i=1; i<=10; i++) {
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echo = squares.createTask("echo");
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echo.setMessage(i*i);
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echo.perform();
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}
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]]> </script>
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</target>
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</project>
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</pre></blockquote>
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<p>generates</p>
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<blockquote><pre>
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main:
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1
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4
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9
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16
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25
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36
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49
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64
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81
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100
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BUILD SUCCESSFUL
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</pre></blockquote>
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<p>Another example, using <a href="../using.html#references">references by id</a>
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and two different scripting languages:</p>
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<blockquote><pre>
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<project name="testscript" default="main">
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<target name="sub">
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<echo id="theEcho"/>
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</target>
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<target name="sub1">
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<script language="netrexx"><![CDATA[
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theEcho.setMessage("In sub1")
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sub.execute
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]]></script>
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</target>
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<target name="sub2">
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<script language="javascript"><![CDATA[
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theEcho.setMessage("In sub2");
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sub.execute();
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]]></script>
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</target>
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<target name="main" depends="sub1,sub2"/>
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</project>
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</pre></blockquote>
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<p>generates</p>
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<blockquote><pre>
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sub1:
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In sub1
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sub2:
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In sub2
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main:
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BUILD SUCCESSFUL
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</pre></blockquote>
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<p>Now a more complex example using the Java API and the Ant API. The goal is to list the
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filesizes of all files a <fileset/> caught.</p>
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<blockquote><pre>
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<?xml version="1.0" encoding="ISO-8859-1"?>
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<project name="<font color=blue>MyProject</font>" basedir="." default="main">
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<property name="fs.dir" value="src"/>
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<property name="fs.includes" value="**/*.txt"/>
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<property name="fs.excludes" value="**/*.tmp"/>
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<target name="main">
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<script language="javascript"> <![CDATA[
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// import statements
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<font color=blue>// importPackage(java.io)</font>;
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<font color=blue>importClass(java.io.File)</font>;
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// Access to Ant-Properties by their names
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dir = <font color=blue>project</font>.getProperty("fs.dir");
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includes = <font color=blue>MyProject</font>.getProperty("fs.includes");
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excludes = <font color=blue>self.getProject()</font> .<font color=blue>getProperty("fs.excludes")</font>;
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// Create a <fileset dir="" includes="" />
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fs = project.<font color=blue>createDataType("fileset")</font>;
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fs.setDir( new File(dir) );
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<font color=blue>fs.setIncludes(includes)</font>;
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fs.setExcludes(excludes);
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// Get the files (array) of that fileset
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ds = fs.getDirectoryScanner(project);
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srcFiles = ds.getIncludedFiles();
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// iterate over that array
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for (i=0; i<srcFiles.length; i++) {
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// get the values via Java API
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var basedir = fs.getDir(project);
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var filename = srcFiles[i];
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var file = <font color=blue>new File(basedir, filename)</font>;
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var size = file.length();
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// create and use a Task via Ant API
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echo = MyProject.<font color=blue>createTask("echo")</font>;
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echo.setMessage(filename + ": " + size + " byte");
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echo.<font color=blue>perform()</font>;
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}
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]]></script>
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</target>
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</project>
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</pre></blockquote>
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<p>We want to use the Java API. Because we don<6F>t want always typing the package signature
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we do an import. Rhino knows two different methods for import statements: one for packages
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and one for a single class. By default only the <i>java</i> packages are available, so
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<i>java.lang.System</i> can be directly imported with <code>importClass/importPackage</code>.
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For other packages you have to prefix the full classified name with <i>Package</i>.
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For example ant<6E>s <i>FileUtil</i> class can be imported with
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<code>importClass(<b>Package</b>.org.apache.tools.ant.util.FileUtils)</code>
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<br>
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The <script> task populates the Project instance under
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the name <i>project</i>, so we can use that reference. Another way is to use its given name
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or getting its reference from the task itself.<br>
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The Project provides methods for accessing and setting properties, creating DataTypes and
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Tasks and much more.<br>
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After creating a FileSet object we initialize that by calling its set-methods. Then we can
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use that object like a normal Ant task (<copy> for example).<br>
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For getting the size of a file we instantiate a <code>java.io.File</code>. So we are using
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normal Java API here.<br>
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Finally we use the <echo> task for producing the output. The task is not executed by
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its execute() method, because the perform() method (implemented in Task itself) does the
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apropriate logging before and after invoking execute().
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</p>
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<hr>
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<p align="center">Copyright © 2000-2004 The Apache Software Foundation. All rights
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Reserved.</p>
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</body>
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</html>
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