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98 lines
3.4 KiB
HTML
98 lines
3.4 KiB
HTML
<!DOCTYPE html>
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<!--
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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https://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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<html lang="en">
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<head>
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<link rel="stylesheet" type="text/css" href="../stylesheets/style.css">
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<title>Condition Task</title>
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</head>
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<body>
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<h2 id="condition">Condition</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 generalization
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of <a href="available.html">Available</a> and <a href="uptodate.html">Uptodate</a>.</p>
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<p>If the condition holds true, the property value is set to <q>true</q> by default; otherwise, the
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property is not set. You can set the value to something other than the default by specifying
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the <var>value</var> attribute.</p>
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<p>Conditions are specified as <a href="#nested">nested elements</a>, you must specify exactly one
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condition.</p>
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<h3>Parameters</h3>
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<table class="attr">
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<tr>
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<th scope="col">Attribute</th>
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<th scope="col">Description</th>
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<th scope="col">Required</th>
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</tr>
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<tr>
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<td>property</td>
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<td>The name of the property to set.</td>
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<td>Yes</td>
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</tr>
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<tr>
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<td>value</td>
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<td>The value to set the property to.</td>
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<td>No; defaults to <q>true</q></td>
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</tr>
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<tr>
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<td>else</td>
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<td>The value to set the property to if the condition evaluates to <q>false</q>. <em>Since
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Apache Ant 1.6.3</em>
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</td>
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<td>No; by default the property will remain unset</td>
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</tr>
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</table>
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<h3 id="nested">Parameters specified as nested elements</h3>
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<p>All conditions to test are specified as nested elements, for a complete list
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see <a href="conditions.html">here</a>.</p>
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<h3>Examples</h3>
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<p>Set the property <code>javamail.complete</code> if both the JavaBeans Activation Framework and
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JavaMail are available in the classpath.</p>
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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></pre>
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<p>Set the property <code>isMacOsButNotMacOsX</code> if the current operating system is MacOS, but
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not MacOS X/macOS—which Ant considers to be in the Unix family as well.</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></pre>
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<p>Set the property <code>isSunOSonSparc</code> if the current operating system is SunOS and if it
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is running on a SPARC architecture.</p>
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<pre>
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<condition property="isSunOSonSparc">
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<os name="SunOS" arch="sparc"/>
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</condition></pre>
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</body>
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</html>
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