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| 2 |
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| 3 | <head>
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| 4 | <meta http-equiv="Content-Language" content="en-us">
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| 5 | <title>Available Task</title>
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| 6 | <link rel="stylesheet" type="text/css" href="../stylesheets/antmanual.css">
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| 7 | </head>
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| 8 |
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| 9 | <body>
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| 10 |
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| 11 | <h2><a name="available">Available</a></h2>
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| 12 | <h3>Description</h3>
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| 13 | <p>Sets a property if a resource is available at runtime. This resource can be a
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| 14 | file, a directory, a class in the classpath, or a JVM system resource.</p>
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| 15 | <p>If the resource is present, the property value is set to true by
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| 16 | default; otherwise, the property is not set. You can set the value to
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| 17 | something other than the default by specifying the <code>value</code> attribute.</p>
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| 18 | <p>Normally, this task is used to set properties that are useful to avoid target
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| 19 | execution depending on system parameters.</p>
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| 20 | <h3>Parameters</h3>
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| 21 | <table border="1" cellpadding="2" cellspacing="0">
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| 22 | <tr>
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| 23 | <td valign="top"><b>Attribute</b></td>
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| 24 | <td valign="top"><b>Description</b></td>
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| 25 | <td align="center" valign="top"><b>Required</b></td>
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| 26 | </tr>
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| 27 | <tr>
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| 28 | <td valign="top">property</td>
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| 29 | <td valign="top">The name of the property to set.</td>
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| 30 | <td valign="top" align="center">Yes</td>
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| 31 | </tr>
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| 32 | <tr>
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| 33 | <td valign="top">value</td>
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| 34 | <td valign="top">The value to set the property to. Defaults to "true".</td>
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| 35 | <td valign="top" align="center">No</td>
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| 36 | </tr>
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| 37 | <tr>
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| 38 | <td valign="top">classname</td>
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| 39 | <td valign="top">The class to look for in the classpath.</td>
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| 40 | <td valign="middle" align="center" rowspan="3">Yes</td>
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| 41 | </tr>
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| 42 | <tr>
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| 43 | <td valign="top">file</td>
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| 44 | <td valign="top">The file to look for.</td>
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| 45 | </tr>
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| 46 | <tr>
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| 47 | <td valign="top">resource</td>
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| 48 | <td valign="top">The resource to look for in the JVM.</td>
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| 49 | </tr>
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| 50 | <tr>
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| 51 | <td valign="top">classpath</td>
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| 52 | <td valign="top">The classpath to use when looking up <code>classname</code> or <code>resource</code>.</td>
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| 53 | <td align="center" valign="top">No</td>
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| 54 | </tr>
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| 55 | <tr>
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| 56 | <td valign="top">filepath</td>
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| 57 | <td valign="top">The path to use when looking up <code>file</code>.</td>
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| 58 | <td align="center" valign="top">No</td>
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| 59 | </tr>
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| 60 | <tr>
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| 61 | <td valign="top">classpathref</td>
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| 62 | <td valign="top">The classpath to use, given as a <a href="../using.html#references">reference</a> to a path defined elsewhere.</td>
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| 63 | <td align="center" valign="top">No</td>
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| 64 | </tr>
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| 65 | <tr>
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| 66 | <td valign="top">type</td>
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| 67 | <td valign="top">The type of <code>file</code> to look for, either a directory (<code>type="dir"</code>) or a file
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| 68 | (<code>type="file"</code>). If not set, the property will be set if the name specified in the <code>file</code>
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| 69 | attribute exists as either a file or a directory.</td>
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| 70 | <td align="center" valign="top">No</td>
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| 71 | </tr>
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| 72 | <tr>
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| 73 | <td valign="top">ignoresystemclasses</td>
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| 74 | <td valign="top">Ignore Ant's runtime classes, using only the specified
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| 75 | classpath. Only affects the "classname" attribute. Defaults to "false"</td>
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| 76 | <td align="center" valign="top">No</td>
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| 77 | </tr>
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| 78 |
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| 79 | </table>
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| 80 | <h3>Parameters specified as nested elements</h3>
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| 81 | <h4>classpath</h4>
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| 82 | <p><code>Available</code>'s <code>classpath</code> attribute is a <a
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| 83 | href="../using.html#path">path-like structure</a> and can also be set via a nested
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| 84 | <code><classpath></code> element.</p>
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| 85 | <h4>filepath</h4>
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| 86 | <p><code>Available</code>'s <code>filepath</code> attribute is a <a
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| 87 | href="../using.html#path">path-like structure</a> and can also be set via a nested
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| 88 | <code><filepath></code> element.</p>
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| 89 | <h3>Examples</h3>
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| 90 | <pre> <available classname="org.whatever.Myclass" property="Myclass.present"/></pre>
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| 91 | <p>sets the <code>Myclass.present</code> property to the value "true"
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| 92 | if the class <code>org.whatever.Myclass</code> is found in Ant's classpath.</p>
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| 93 | <pre>
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| 94 | <property name="jaxp.jar" value="./lib/jaxp11/jaxp.jar"/>
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| 95 | <available file="${jaxp.jar}" property="jaxp.jar.present"/>
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| 96 | </pre>
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| 97 | <p>sets the <code>jaxp.jar.present</code> property to the value "true"
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| 98 | if the file <code>./lib/jaxp11/jaxp.jar</code> is found.</p>
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| 99 | <pre>
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| 100 | <available file="/usr/local/lib" type="dir" property="local.lib.present"/>
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| 101 | </pre>
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| 102 | <p>sets the <code>local.lib.present</code> property to the value "true"
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| 103 | if the directory <code>/usr/local/lib</code> is found.</p>
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| 104 | <pre>
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| 105 | ...in project ...
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| 106 | <property name="jaxp.jar" value="./lib/jaxp11/jaxp.jar"/>
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| 107 | <path id="jaxp" location="${jaxp.jar}"/>
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| 108 | ...in target ...
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| 109 | <available classname="javax.xml.transform.Transformer" classpathref="jaxp" property="jaxp11.present"/>
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| 110 | </pre>
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| 111 | <p>sets the <code>jaxp11.present</code> property to the value "true"
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| 112 | 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>).
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| 113 | </p>
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| 114 | <pre>
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| 115 | <available property="have.extras" resource="extratasks.properties">
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| 116 | <classpath>
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| 117 | <pathelement location="/usr/local/ant/extra.jar/>
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| 118 | </classpath>
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| 119 | </available>
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| 120 | </pre>
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| 121 | <p>sets the <code>have.extras</code> property to the value "true"
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| 122 | if the resource-file <code>extratasks.properties</code> is found.
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| 123 | </p>
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| 124 | <hr><p align="center">Copyright © 2000-2002,2004 The Apache Software Foundation. All rights
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| 125 | Reserved.</p>
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| 126 |
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| 127 | </body>
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| 128 | </html>
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| 129 |
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