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<link rel="stylesheet" type="text/css" href="../stylesheets/style.css">
<title>Typedef Task</title>
</head>
<body>
<h2><a name="typedef">Typedef</a></h2>
<h3>Description</h3>
<p>
Adds a task or a data type definition to the current project
such that this new type or task can be used in the current project.
</p>
<p>
A Task is any class that extends org.apache.tools.ant.Task or
can be adapted as a Task using an adapter class.
</p>
<p>
Data types are things like <a href="../using.html#path">paths</a> or
<a href="../CoreTypes/fileset.html">filesets</a> that can be defined at
the project level and referenced via their ID attribute.
Custom data types usually need custom tasks to put them to good use.
</p>
<p>
Two attributes are needed to make a definition: the name that
identifies this data type uniquely, and the full name of the class
(including its package name) that implements this type.
</p>
<p>
You can also define a group of definitions at once using the file or
resource attributes. These attributes point to files in the format of
Java property files or an xml format.
</p>
<p>
For property files each line defines a single data type in the
format:</p>
<pre>
typename=fully.qualified.java.classname
</pre>
<p>
The xml format is described in the
<a href="../CoreTypes/antlib.html">Antlib</a> section.
</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">name</td>
<td valign="top">the name of the data type</td>
<td valign="top" align="center">Yes, unless the file or resource type
attributes have been specified.</td>
</tr>
<tr>
<td valign="top">classname</td>
<td valign="top">the full class name implementing the data type</td>
<td valign="top" align="center">Yes, unless file or resource
have been specified.</td>
</tr>
<tr>
<td valign="top">file</td>
<td valign="top">Name of the file to load definitions from.</td>
<td valign="top" align="center">No</td>
</tr>
<tr>
<td valign="top">resource</td>
<td valign="top">
Name of the resource to load definitions from.
If multiple resources by this name are found along the classpath,
and the format is "properties", the first resource will be loaded;
otherwise all such resources will be loaded.
</td>
<td valign="top" align="center">No</td>
</tr>
<tr>
<td valign="top">format</td>
<td valign="top">The format of the file or resource. The values
are "properties" or "xml". If the value is "properties" the file/resource
is a property file contains name to classname pairs. If the value
is "xml", the file/resource is an xml file/resource structured according
to <a href="../CoreTypes/antlib.html">Antlib</a>.
The default is "properties" unless the file/resource name ends with
".xml", in which case the format attribute will have the value "xml".
<b>since Ant 1.6</b>
</td>
<td valign="top" align="center">No</td>
</tr>
<tr>
<td valign="top">classpath</td> <td valign="top">the classpath to
use when looking up <code>classname</code>.</td>
<td align="center" valign="top">No</td>
</tr>
<tr>
<td valign="top">classpathref</td>
<td valign="top">
a reference to a classpath to use when looking up <code>classname</code>.
</td>
<td align="center" valign="top">No</td>
</tr>
<tr>
<td valign="top">loaderRef</td>
<td valign="top">the name of the loader that is
used to load the class, constructed from the specified classpath. Use
this to allow multiple tasks/types to be loaded with the same loader,
so they can call each other. <b>since Ant 1.5</b> </td>
<td align="center" valign="top">No</td>
</tr>
<tr>
<td valign="top">onerror</td>
<td valign="top">The action to take if there was a failure in defining the
type. The values are <i>fail</i>: cause a build exception; <i>report</i>:
output a warning, but continue; <i>ignore</i>: do nothing.
<b>since Ant 1.6</b>
An additional value is <i>failall</i>: cause all behavior of fail,
as well as a build exception for the resource or file attribute
if the resource or file is not found. <b>since Ant 1.7</b>
The default is <i>fail</i>.
</td>
<td valign="top" align="center">No</td>
</tr>
<tr>
<td valign="top">adapter</td>
<td valign="top">A class that is used to adapt the defined class to
another interface/class. The adapter class must implement the interface
"org.apache.tools.ant.TypeAdapter". The adapter class will be used
to wrap the defined class unless the defined class implements/extends
the class defined by the attribute "adaptto".
If "adaptto" is not set, the defined class will always be wrapped.
<b>since Ant 1.6</b>
</td>
<td valign="top" align="center">No</td>
</tr>
<tr>
<td valign="top">adaptto</td>
<td valign="top">This attribute is used in conjunction with the
adapter attribute.
If the defined class does not implement/extend the interface/class
specified by this attribute, the adaptor class will be used
to wrap the class. <b>since Ant 1.6</b>
</td>
<td valign="top" align="center">No</td>
</tr>
<tr>
<td valign="top">uri</td>
<td valign="top">
The uri that this definition should live in.
<b>since Ant 1.6</b>
</td>
<td valign="top" align="center">No</td>
</tr>
</table>
<h3>Parameters specified as nested elements</h3>
<h4>classpath</h4>
<p><code>Typedef</code>'s <i>classpath</i> attribute is a
<a href="../using.html#path">path-like structure</a> and can also be set
via a nested <i>classpath</i> element.</p>
<h3>Examples</h3>
The following fragment defines define a type called <i>urlset</i>.
<pre>
<typedef name="urlset" classname="com.mydomain.URLSet"/> </pre>
The data type is now available to Ant. The
class <code>com.mydomain.URLSet</code> implements this type.</p>
<p>
Assuming a class <i>org.acme.ant.RunnableAdapter</i> that
extends Task and implements <i>org.apache.tools.ant.TypeAdapter</i>,
and in the execute method invokes <i>run</i> on the proxied object,
one may use a Runnable class as an Ant task. The following fragment
defines a task called <i>runclock</i>.
</p>
<pre>
<typedef name="runclock"
classname="com.acme.ant.RunClock"
adapter="org.acme.ant.RunnableAdapter"/>
</pre>
<p>
The following fragment shows the use of the classpathref and
loaderref to load up two definitions.
</p>
<pre>
<path id="lib.path">
<fileset dir="lib" includes="lib/*.jar"/>
</path>
<typedef name="filter1"
classname="org.acme.filters.Filter1"
classpathref="lib.path"
loaderref="lib.path.loader"
/>
<typedef name="filter2"
classname="org.acme.filters.Filter2"
loaderref="lib.path.loader"
/>
</pre>
<p>
If you want to load an antlib into a special xml-namespace, the <tt>uri</tt> attribute
is important:
</p>
<pre>
<project xmlns:antcontrib="antlib:net.sf.antcontrib">
<taskdef uri="antlib:net.sf.antcontrib"
resource="net/sf/antcontrib/antlib.xml"
classpath="path/to/ant-contrib.jar"/>
</pre>
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