| <!DOCTYPE html> |
| <!-- |
| Licensed to the Apache Software Foundation (ASF) under one or more |
| contributor license agreements. See the NOTICE file distributed with |
| this work for additional information regarding copyright ownership. |
| The ASF licenses this file to You under the Apache License, Version 2.0 |
| (the "License"); you may not use this file except in compliance with |
| the License. You may obtain a copy of the License at |
| |
| https://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an "AS IS" BASIS, |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| See the License for the specific language governing permissions and |
| limitations under the License. |
| --> |
| <html lang="en"> |
| |
| <head> |
| <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—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> |
| <condition property="javamail.complete"> |
| <and> |
| <available classname="javax.activation.DataHandler"/> |
| <available classname="javax.mail.Transport"/> |
| </and> |
| </condition></pre> |
| |
| <p>Set the property <code>isMacOsButNotMacOsX</code> if the current operating system is MacOS, but |
| not MacOS X/macOS—which Ant considers to be in the Unix family as well.</p> |
| <pre> |
| <condition property="isMacOsButNotMacOsX"> |
| <and> |
| <os family="mac"/> |
| <not> |
| <os family="unix"/> |
| </not> |
| </and> |
| </condition></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> |
| <condition property="isSunOSonSparc"> |
| <os name="SunOS" arch="sparc"/> |
| </condition></pre> |
| |
| </body> |
| </html> |
