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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>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="../Types/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="../Types/antlib.html">Antlib</a> section.
- </p>
-
- <p>If you are defining tasks or types that share the same classpath
- with multiple taskdef or typedef tasks, the corresponding classes
- will be loaded by different
- Java <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/ClassLoader.html">ClassLoaders</a>.
- Two classes with the same name loaded via different ClassLoaders
- are not the same class from the point of view of the Java VM, they
- don't share static variables and instances of these classes can't
- access private methods or attributes of instances defined by "the
- other class" of the same name. They don't even belong to the same
- Java package and can't access package private code, either.</p>
-
- <p>The best way to load several tasks/types that are supposed to
- cooperate with each other via shared Java code is to use the
- resource attribute and an antlib descriptor. If this is not
- possible, the second best option is to use the loaderref attribute
- and specify the same name for each and every typedef/taskdef -
- this way the classes will share the same ClassLoader. Note that
- the typedef/taskdef tasks must use identical classpath definitions
- (this includes the order of path components) for the loaderref
- attribute to work.</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="../Types/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 Apache 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>
- &lt;typedef name="urlset" classname="com.mydomain.URLSet"/&gt; </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>
- &lt;typedef name="runclock"
- classname="com.acme.ant.RunClock"
- adapter="org.acme.ant.RunnableAdapter"/&gt;
- </pre>
-
-
- <p>
- The following fragment shows the use of the classpathref and
- loaderref to load up two definitions.
- </p>
- <pre>
- &lt;path id="lib.path"&gt;
- &lt;fileset dir="lib" includes="lib/*.jar"/&gt;
- &lt;/path&gt;
-
- &lt;typedef name="filter1"
- classname="org.acme.filters.Filter1"
- classpathref="lib.path"
- loaderref="lib.path.loader"
- /&gt;
- &lt;typedef name="filter2"
- classname="org.acme.filters.Filter2"
- loaderref="lib.path.loader"
- /&gt;
- </pre>
-
-
- <p>
- If you want to load an antlib into a special xml-namespace, the <tt>uri</tt> attribute
- is important:
- </p>
- <pre>
- &lt;project xmlns:antcontrib="antlib:net.sf.antcontrib"&gt;
- &lt;taskdef uri="antlib:net.sf.antcontrib"
- resource="net/sf/antcontrib/antlib.xml"
- classpath="path/to/ant-contrib.jar"/&gt;
- </pre>
-
-<p>Here the namespace
- declaration <code>xmlns:antcontrib="antlib:net.sf.antcontrib"</code>
- allows tasks and types of the AntContrib Antlib to be used with the
- <code>antcontrib</code> prefix
- like <code>&lt;antcontrib:if&gt;</code>.
- The normal rules of XML namespaces apply and you can declare the
- prefix at any element to make it usable for the element it is
- declared on as well as all its child elements.</p>
-
-
-</body>
-</html>
-