2001-08-09 05:48:49 +00:00
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<html>
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<head>
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<meta http-equiv="Content-Language" content="en-us">
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2002-02-03 22:00:42 +00:00
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<title>Condition Task</title>
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2001-08-09 05:48:49 +00:00
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</head>
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<body>
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<h2><a name="Condition">Condition</a></h2>
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<h3>Description</h3>
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<p>Sets a property if a certain condition holds true - this is a
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generalization of <a href="available.html">Available</a> and <a
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href="uptodate.html">Uptodate</a>.</p>
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<p>If the condition holds true, the property value is set to true by
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default; otherwise, the property is not set. You can set the value to
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something other than the default by specifying the <code>value</code>
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attribute.</p>
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<p>Conditions are specified as <a href="#nested">nested elements</a>,
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you must specify exactly one condition.</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">property</td>
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<td valign="top">The name of the property to set.</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">value</td>
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<td valign="top">The value to set the property to. Defaults to
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"true".</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><a name="nested">Parameters specified as nested elements</a></h3>
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2001-11-30 12:05:27 +00:00
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<p>All conditions to test are specified as nested elements, for a
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complete list see <a href="conditions.html">here</a>.</p>
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2001-11-16 12:30:58 +00:00
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2001-08-09 05:48:49 +00:00
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<h3>Examples</h3>
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<pre>
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<condition property="javamail.complete">
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<and>
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<available classname="javax.activation.DataHandler" />
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<available classname="javax.mail.Transport" />
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</and>
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</condition>
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</pre>
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<p>sets the property <code>javamail.complete</code> if both the
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JavaBeans Activation Framework and JavaMail are available in the
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classpath.</p>
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<pre>
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<condition property="isMacOsButNotMacOsX">
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<and>
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<os family="mac" />
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<not>
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<os family="unix" />
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</not>
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</and>
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</condition>
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</pre>
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<p>sets the property <code>isMacOsButNotMacOsX</code> if the current
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operating system is MacOS, but not MacOS X - which Ant considers to be
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in the Unix family as well.</p>
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2001-11-25 07:54:28 +00:00
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<pre>
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2001-11-26 14:22:19 +00:00
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<condition property="isSunOSonSparc">
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<os name="SunOS" arch="sparc" />
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2001-11-25 07:54:28 +00:00
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</condition>
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</pre>
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2001-11-26 14:22:19 +00:00
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<p>sets the property <code>isSunOSonSparc</code> if the current
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operating system is SunOS and if it is running on a sparc architecture.</p>
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2001-11-25 07:54:28 +00:00
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2001-08-09 05:48:49 +00:00
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<hr>
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<p align="center">Copyright © 2001 Apache Software
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Foundation. All rights Reserved.</p>
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</body>
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</html>
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