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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><a name="Condition">Condition</a></h2>
<h3>Description</h3>
<p>Sets a property if a certain condition holds true - 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 true by
default; otherwise, the property is not set. You can set the value to
something other than the default by specifying the <code>value</code>
attribute.</p>
<p>Conditions are specified as <a href="#nested">nested elements</a>,
you must specify exactly one condition.</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 the property to set.</td>
<td valign="top" align="center">Yes</td>
</tr>
<tr>
<td valign="top">value</td>
<td valign="top">The value to set the property to. Defaults to
"true".</td>
<td valign="top" align="center">No</td>
</tr>
<tr>
<td valign="top">else</td>
<td valign="top">The value to set the property to if the condition
evaluates to <i>false</i>. By default the property will remain unset.
<em>Since Apache Ant 1.6.3</em>
</td>
<td valign="top" align="center">No</td>
</tr>
</table>
<h3><a name="nested">Parameters specified as nested elements</a></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>
<pre>
<condition property="javamail.complete">
<and>
<available classname="javax.activation.DataHandler"/>
<available classname="javax.mail.Transport"/>
</and>
</condition>
</pre>
<p>sets the property <code>javamail.complete</code> if both the
JavaBeans Activation Framework and JavaMail are available in the
classpath.</p>
<pre>
<condition property="isMacOsButNotMacOsX">
<and>
<os family="mac"/>
<not>
<os family="unix"/>
</not>
</and>
</condition>
</pre>
<p>sets the property <code>isMacOsButNotMacOsX</code> if the current
operating system is MacOS, but not MacOS X - which Ant considers to be
in the Unix family as well.</p>
<pre>
<condition property="isSunOSonSparc">
<os name="SunOS" arch="sparc"/>
</condition>
</pre>
<p>sets the property <code>isSunOSonSparc</code> if the current
operating system is SunOS and if it is running on a sparc architecture.</p>
</body>
</html>
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