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-<!--
- 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
-
- http://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>
-
-<head>
-<meta http-equiv="Content-Language" content="en-us">
-<link rel="stylesheet" type="text/css" href="../stylesheets/style.css">
-<title>Available Task</title>
-</head>
-
-<body>
-
-<h2><a name="available">Available</a></h2>
-<h3>Description</h3>
-<p>Sets a property if a resource is available at runtime. This resource can be a
-file, a directory, a class in the classpath, or a JVM system resource.</p>
-<p>If the resource is present, 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>Normally, this task is used to set properties that are useful to avoid target
-execution depending on system parameters.</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 &quot;true&quot;.</td>
- <td valign="top" align="center">No</td>
- </tr>
- <tr>
- <td valign="top">classname</td>
- <td valign="top">The class to look for in the classpath.</td>
- <td valign="middle" align="center" rowspan="3">Yes</td>
- </tr>
- <tr>
- <td valign="top">file</td>
- <td valign="top">The file to look for.</td>
- </tr>
- <tr>
- <td valign="top">resource</td>
- <td valign="top">The resource to look for in the JVM.</td>
- </tr>
- <tr>
- <td valign="top">classpath</td>
- <td valign="top">The classpath to use when looking up <code>classname</code> or <code>resource</code>.</td>
- <td align="center" valign="top">No</td>
- </tr>
- <tr>
- <td valign="top">filepath</td>
- <td valign="top">The path to use when looking up <code>file</code>.</td>
- <td align="center" valign="top">No</td>
- </tr>
- <tr>
- <td valign="top">classpathref</td>
- <td valign="top">The classpath to use, given as a <a href="../using.html#references">reference</a> to a path defined elsewhere.</td>
- <td align="center" valign="top">No</td>
- </tr>
- <tr>
- <td valign="top">type</td>
- <td valign="top">The type of <code>file</code> to look for, either a directory (<code>type=&quot;dir&quot;</code>) or a file
- (<code>type=&quot;file&quot;</code>). If not set, the property will be set if the name specified in the <code>file</code>
- attribute exists as either a file or a directory.</td>
- <td align="center" valign="top">No</td>
- </tr>
- <tr>
- <td valign="top">ignoresystemclasses</td>
- <td valign="top">Ignore Ant's runtime classes, using only the specified
- classpath. Only affects the "classname" attribute. Defaults to &quot;false&quot;</td>
- <td align="center" valign="top">No</td>
- </tr>
- <tr>
- <td valign="top">searchparents</td>
- <td valign="top">This contains the behaviour of the "file" type.
- If true, the available task will, when
- searching for a file, search not only the directories specified but
- will also search the parent directories of those
- specified.
- If false, only the directories specified will be searched.
- Defaults to "false".
- <em>Since Ant 1.7</em>
- </td>
- <td align="center" valign="top">No</td>
- </tr>
-</table>
-<h3>Parameters specified as nested elements</h3>
-<h4>classpath</h4>
-<p><code>Available</code>'s <code>classpath</code> attribute is a <a
-href="../using.html#path">path-like structure</a> and can also be set via a nested
-<code>&lt;classpath&gt;</code> element.</p>
-<h4>filepath</h4>
-<p><code>Available</code>'s <code>filepath</code> attribute is a <a
-href="../using.html#path">path-like structure</a> and can also be set via a nested
-<code>&lt;filepath&gt;</code> element.</p>
-<h3>Examples</h3>
-<blockquote><pre>
-&lt;available classname=&quot;org.whatever.Myclass&quot; property=&quot;Myclass.present&quot;/&gt;
-</pre></blockquote>
-<p>sets the <code>Myclass.present</code> property to the value &quot;true&quot;
-if the class <code>org.whatever.Myclass</code> is found in Ant's classpath.</p>
-<blockquote><pre>
-&lt;property name=&quot;jaxp.jar&quot; value=&quot;./lib/jaxp11/jaxp.jar&quot;/&gt;
-&lt;available file=&quot;${jaxp.jar}&quot; property=&quot;jaxp.jar.present&quot;/&gt;
-</pre></blockquote>
-<p>sets the <code>jaxp.jar.present</code> property to the value &quot;true&quot;
-if the file <code>./lib/jaxp11/jaxp.jar</code> is found.</p>
-<blockquote><pre>
-&lt;available file=&quot;/usr/local/lib&quot; type=&quot;dir&quot;
- property=&quot;local.lib.present&quot;/&gt;
-</pre></blockquote>
-<p>sets the <code>local.lib.present</code> property to the value &quot;true&quot;
-if the directory <code>/usr/local/lib</code> is found.</p>
-<blockquote><pre>
-...in project ...
-&lt;property name=&quot;jaxp.jar&quot; value=&quot;./lib/jaxp11/jaxp.jar&quot;/&gt;
-&lt;path id=&quot;jaxp&quot; location=&quot;${jaxp.jar}&quot;/&gt;
-...in target ...
-&lt;available classname=&quot;javax.xml.transform.Transformer&quot;
- classpathref=&quot;jaxp&quot; property=&quot;jaxp11.present&quot;/&gt;
-</pre></blockquote>
-<p>sets the <code>jaxp11.present</code> property to the value &quot;true&quot;
-if the class <code>javax.xml.transform.Transformer</code> is found in the classpath referenced by <code>jaxp</code> (in this case, <code>./lib/jaxp11/jaxp.jar</code>).
-</p>
-<blockquote><pre>
-&lt;available property=&quot;have.extras&quot; resource=&quot;extratasks.properties&quot;&gt;
- &lt;classpath&gt;
- &lt;pathelement location=&quot;/usr/local/ant/extra.jar&quot; /&gt;
-&nbsp;&nbsp;&lt;/classpath&gt;
-&lt;/available&gt;
-</pre></blockquote>
-<p>sets the <code>have.extras</code> property to the value &quot;true&quot;
-if the resource-file <code>extratasks.properties</code> is found.
-</p>
-
-
-</body>
-</html>
-