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<html>
<head>
<meta http-equiv="Content-Language" content="en-us">
<link rel="stylesheet" type="text/css" href="../stylesheets/style.css">
<title>Condition Task</title>
</head>
<body>
<h2 id="condition">Condition</h2>
<h3>Description</h3>
<p>Sets a property if a certain condition holds true&mdash;this is a generalization
of <a href="available.html">Available</a> and <a href="uptodate.html">Uptodate</a>.</p>
<p>If the condition holds true, the property value is set to <q>true</q> by default; otherwise, the
property is not set. You can set the value to something other than the default by specifying
the <var>value</var> attribute.</p>
<p>Conditions are specified as <a href="#nested">nested elements</a>, you must specify exactly one
condition.</p>
<h3>Parameters</h3>
<table class="attr">
<tr>
<th scope="col">Attribute</th>
<th scope="col">Description</th>
<th scope="col">Required</th>
</tr>
<tr>
<td>property</td>
<td>The name of the property to set.</td>
<td>Yes</td>
</tr>
<tr>
<td>value</td>
<td>The value to set the property to.</td>
<td>No; defaults to <q>true</q></td>
</tr>
<tr>
<td>else</td>
<td>The value to set the property to if the condition evaluates to <q>false</q>. <em>Since
Apache Ant 1.6.3</em>
</td>
<td>No; by default the property will remain unset</td>
</tr>
</table>
<h3 id="nested">Parameters specified as nested elements</h3>
<p>All conditions to test are specified as nested elements, for a complete list
see <a href="conditions.html">here</a>.</p>
<h3>Examples</h3>
<p>Set the property <code>javamail.complete</code> if both the JavaBeans Activation Framework and
JavaMail are available in the classpath.</p>
<pre>
&lt;condition property=&quot;javamail.complete&quot;&gt;
&lt;and&gt;
&lt;available classname=&quot;javax.activation.DataHandler&quot;/&gt;
&lt;available classname=&quot;javax.mail.Transport&quot;/&gt;
&lt;/and&gt;
&lt;/condition&gt;</pre>
<p>Set the property <code>isMacOsButNotMacOsX</code> if the current operating system is MacOS, but
not MacOS X/macOS&mdash;which Ant considers to be in the Unix family as well.</p>
<pre>
&lt;condition property=&quot;isMacOsButNotMacOsX&quot;&gt;
&lt;and&gt;
&lt;os family=&quot;mac&quot;/&gt;
&lt;not&gt;
&lt;os family=&quot;unix&quot;/&gt;
&lt;/not&gt;
&lt;/and&gt;
&lt;/condition&gt;</pre>
<p>Set the property <code>isSunOSonSparc</code> if the current operating system is SunOS and if it
is running on a SPARC architecture.</p>
<pre>
&lt;condition property=&quot;isSunOSonSparc&quot;&gt;
&lt;os name=&quot;SunOS&quot; arch=&quot;sparc&quot;/&gt;
&lt;/condition&gt;</pre>
</body>
</html>