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<title>jarlib-available Task</title>
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<h2><a name="jarlib-available">jarlib-available</a></h2>
<h3>Description</h3>
<p>Check whether an extension is present in a fileset or an extensionSet.
If the extension is present then a property is set.</p>
<p>Note that this task
works with extensions as defined by the "Optional Package" specification.
For more information about optional packages, see the document
<em>Optional Package Versioning</em> in the documentation bundle for your
Java2 Standard Edition package, in file
<code>guide/extensions/versioning.html</code> or online at
<a href="http://java.sun.com/j2se/1.3/docs/guide/extensions/versioning.html">
http://java.sun.com/j2se/1.3/docs/guide/extensions/versioning.html</a>.</p>
<p>See the Extension and ExtensionSet documentation for further details</p>
<h3>Parameters</h3>
<table border="1" cellpadding="2" cellspacing="0">
<tr>
<td valign="top"><b>Attribute</b></td>
<td valign="top"><b>Description</b></td>
<td align="center" valign="top"><b>Required</b></td>
</tr>
<tr>
<td valign="top">property</td>
<td valign="top">The name of property to set if extensions is available.</td>
<td valign="top" align="center">Yes</td>
</tr>
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<td valign="top">file</td>
<td valign="top">The file to check for extension</td>
<td valign="top" align="center">No, one of file, nested
ExtensionSet or nested fileset must be present.</td>
</tr>
</table>
<h3>Parameters specified as nested elements</h3>
<h4>extension</h4>
<p><a href="../OptionalTypes/extension.html">Extension</a> the extension
to search for.</p>
<h4>fileset</h4>
<p><a href="../CoreTypes/fileset.html">FileSet</a>s are used to select
sets of files to check for extension.</p>
<h4>extensionSet</h4>
<p><a href="../OptionalTypes/extensionset.html">ExtensionSet</a>s is the set
of extensions to search for extension in.</p>
<h3>Examples</h3>
<p><b>Search for extension in single file</b></p>
<pre>
<jarlib-available property="myext.present" file="myfile.jar">
<extension
extensionName="org.apache.tools.ant"
specificationVersion="1.4.9"
specificationVendor="Apache Software Foundation"/>
</jarlib-available>
</pre>
<p><b>Search for extension in single file refencing external Extension</b></p>
<pre>
<extension id="myext"
extensionName="org.apache.tools.ant"
specificationVersion="1.4.9"
specificationVendor="Apache Software Foundation"/>
<jarlib-available property="myext.present" file="myfile.jar">
<extension refid="myext"/>
</jarlib-available>
</pre>
<p><b>Search for extension in fileset</b></p>
<pre>
<extension id="myext"
extensionName="org.apache.tools.ant"
specificationVersion="1.4.9"
specificationVendor="Apache Software Foundation"/>
<jarlib-available property="myext.present">
<extension refid="myext"/>
<fileset dir="lib">
<include name="*.jar"/>
</fileset>
</jarlib-available>
</pre>
<p><b>Search for extension in extensionSet</b></p>
<pre>
<extension id="myext"
extensionName="org.apache.tools.ant"
specificationVersion="1.4.9"
specificationVendor="Apache Software Foundation"/>
<jarlib-available property="myext.present">
<extension refid="myext"/>
<extensionSet id="exts3">
<libfileset
includeUrl="false"
includeImpl="true"
dir="lib">
<include name="*.jar"/>
</libfileset>
</extensionSet>
</jarlib-available>
</pre>
<hr><p align="center">Copyright © 2002,2004 The Apache Software Foundation.
All rights Reserved.</p>
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