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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
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- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- See the License for the specific language governing permissions and
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--->
-<html>
-
- <head>
- <meta http-equiv="Content-Language" content="en-us"></meta>
- <link rel="stylesheet" type="text/css" href="../stylesheets/style.css">
-<title>PreSetDef Task</title>
- <style type="text/css">
- <!--
- .code { background: #EFEFEF; margin-top: }
- -->
- </style>
- </head>
-
- <body>
-
- <h2><a name="presetdef">PreSetDef</a></h2>
- <h3>Description</h3>
- <p>
- The preset definition generates a new definition
- based on a current definition with some attributes
- or elements preset.
- </p>
- <p>
- <em>since Apache Ant 1.6</em>
- </p>
- <p>
- The resolution of properties in any of the attributes or
- nested text takes place with the definition is used and <em>not</em>
- when the preset definition is defined.
- </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 new definition</td>
- <td valign="top" align="center">Yes</td>
- </tr>
- <tr>
- <td valign="top">uri</td>
- <td valign="top">
- The uri that this definition should live in.
- </td>
- <td valign="top" align="center">No</td>
- </tr>
- </table>
- <h3>Parameters specified as nested elements</h3>
- <h4>another type with attributes or elements set</h4>
- <p>The <code>&lt;presetdef&gt;</code> task takes one nested element as a parameter.
- This nested element can be any other type or task. The attributes
- and elements that need to be preset are placed here.
- </p>
-
- <h3>Examples</h3>
- The following fragment defines a javac task with the debug, deprecation
- srcdir and destdir
- attributes set. It also has a src element to source files from a generated
- directory.
- <blockquote>
-<pre class="code">
-&lt;presetdef name="my.javac"&gt;
- &lt;javac debug="${debug}" deprecation="${deprecation}"
- srcdir="${src.dir}" destdir="${classes.dir}"&gt;
- &lt;src path="${gen.dir}"/&gt;
- &lt;/javac&gt;
-&lt;/presetdef&gt;
-</pre>
- </blockquote>
- This can be used as a normal javac task - example:
- <blockquote>
-<pre class="code">
-&lt;my.javac/&gt;
-</pre>
- </blockquote>
- The attributes specified in the preset task may be overridden - i.e.
- they may be seen as optional attributes - example:
- <blockquote>
-<pre class="code">
-&lt;my.javac srcdir="${test.src}" deprecation="no"/&gt;
-</pre>
- </blockquote>
- One may put a presetdef definition in an antlib.
- For example suppose the jar file antgoodies.jar has
- the antlib.xml as follows:
- <blockquote>
-<pre class="code">
-&lt;antlib&gt;
- &lt;taskdef resource="com/acme/antgoodies/tasks.properties"/&gt;
- &lt;!-- Implement the common use of the javac command --&gt;
- &lt;presetdef name="javac"&gt;
- &lt;javac deprecation="${deprecation}" debug="${debug}"
- srcdir="src" destdir="classes"/&gt;
- &lt;/presetdef&gt;
-&lt;/antlib&gt;
-</pre>
- </blockquote>
- One may then use this in a build file as follows:
- <blockquote>
-<pre class="code">
-&lt;project default="example" xmlns:antgoodies="antlib:com.acme.antgoodies"&gt;
- &lt;target name="example"&gt;
- &lt;!-- Compile source --&gt;
- &lt;antgoodies:javac srcdir="src/main"/&gt;
- &lt;!-- Compile test code --&gt;
- &lt;antgoodies:javac srcdir="src/test"/&gt;
- &lt;/target&gt;
-&lt;/project&gt;
-</pre>
- </blockquote>
- <p>
- The following is an example of evaluation of properties when the
- definition is used:
- </p>
- <blockquote>
-<pre class="code">
-&lt;target name="defineandcall"&gt;
- &lt;presetdef name="showmessage"&gt;
- &lt;echo&gt;message is '${message}'&lt;/echo&gt;
- &lt;/presetdef&gt;
- &lt;showmessage/&gt;
- &lt;property name="message" value="Message 1"/&gt;
- &lt;showmessage/&gt;
- &lt;antcall target="called"&gt;
- &lt;param name="message" value="Message 2"/&gt;
- &lt;/antcall&gt;
-&lt;/target&gt;
-&lt;target name="called"&gt;
- &lt;showmessage/&gt;
-&lt;/target&gt;
-</pre>
- </blockquote>
- <p>
- The command ant defineandcall results in the output:
- </p>
- <blockquote>
-<pre class="code">
-defineandcall:
-[showmessage] message is '${message}'
-[showmessage] message is 'Message 1'
-
-called:
-[showmessage] message is 'Message 2'
-</pre>
- </blockquote>
-<p>
-It is possible to use a trick to evaluate properties when the definition is
-<em>made</em> rather than used. This can be useful if you do not expect some
-properties to be available in child builds run with
-<code>&lt;ant ... inheritall="false"&gt;</code>:
-</p>
-<blockquote><pre class="code">
-&lt;macrodef name="showmessage-presetdef"&gt;
- &lt;attribute name="messageval"/&gt;
- &lt;presetdef name="showmessage"&gt;
- &lt;echo&gt;message is '@{messageval}'&lt;/echo&gt;
- &lt;/presetdef&gt;
-&lt;/macrodef&gt;
-&lt;showmessage-presetdef messageval="${message}"/&gt;
-</pre></blockquote>
- <hr></hr>
-
- </body>
-</html>
-