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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<meta http-equiv="Content-Language" content="en-us">
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2005-03-07 18:09:10 +00:00
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<link rel="stylesheet" type="text/css" href="../stylesheets/style.css"/>
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<title>Import Task</title>
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2004-04-16 22:43:27 +00:00
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<link rel="stylesheet" type="text/css" href="../stylesheets/antmanual.css">
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</head>
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<body>
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2003-09-19 09:43:43 +00:00
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<h2><a name="import">Import</a></h2>
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<h3>Description</h3>
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<p>
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Imports another build file into the current project.
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</p>
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<p>
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On execution it will read another Ant file into
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the same Project. This means that it basically works like the
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<a href="http://ant.apache.org/faq.html#xml-entity-include">Entity
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Includes as explained in the Ant FAQ</a>, as if the imported file was
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contained in the importing file, minus the top <code><project></code>
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tag.
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</p>
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<p>
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The import task may only be used as a top-level task. This means that
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it may not be used in a target.
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</p>
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<p>
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There are two further functional aspects that pertain to this task and
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that are not possible with entity includes:
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<ul>
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<li>target overriding</li>
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<li>special properties</li>
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</ul>
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</p>
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<h4>Target overriding</h4>
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<p>If a target in the main file is also present in at least one of the
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imported files, the one from the main file takes precedence.</p>
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<p>So if I import for example a <i>docsbuild.xml</i> file named <b>builddocs</b>,
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that contains a "<b>docs</b>" target, I can redefine it in my main
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buildfile and that is the one that will be called. This makes it easy to
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keep the same target name, so that the overriding target is still called
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by any other targets--in either the main or imported buildfile(s)--for which
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it is a dependency, with a different implementation. The target from <i>docsbuild.xml</i> is
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made available by the name "<b>builddocs</b><b>.docs</b>".
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This enables the new implementation to call the old target, thus
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<i>enhancing</i> it with tasks called before or after it.</p>
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<h4>Special Properties</h4>
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<p>Imported files are treated as they are present in the main
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buildfile. This makes it easy to understand, but it makes it impossible
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for them to reference files and resources relative to their path.
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Because of this, for every imported file, Ant adds a property that
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contains the path to the imported buildfile. With this path, the
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imported buildfile can keep resources and be able to reference them
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relative to its position.</p>
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<p>So if I import for example a <i>docsbuild.xml</i> file named <b>builddocs</b>,
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I can get its path as <b>ant.file.builddocs</b>, similarly to the <b>ant.file</b>
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property of the main buildfile.</p>
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<p>Note that "builddocs" is not the filename, but the name attribute
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present in the imported project tag.</p>
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<h4>Resolving files against the imported file</h4>
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<p>Suppose your main build file called <code>importing.xml</code>
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imports a build file <code>imported.xml</code>, located anywhere on
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the file system, and <code>imported.xml</code> reads a set of
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properties from <code>imported.properties</code>:</p>
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<pre><!-- importing.xml -->
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<project name="importing" basedir="." default="...">
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<import file="${path_to_imported}/imported.xml"/>
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</project>
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<!-- imported.xml -->
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<project name="imported" basedir="." default="...">
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<property file="imported.properties"/>
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</project>
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</pre>
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<p>This snippet however will resolve <code>imported.properties</code>
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against the basedir of <code>importing.xml</code>, because the basedir
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of <code>imported.xml</code> is ignored by Ant. The right way to use
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<code>imported.properties</code> is:</p>
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<pre>
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<!-- imported.xml -->
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<project name="imported" basedir="." default="...">
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<dirname property="imported.basedir" file="${ant.file.imported}"/>
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<property file="${imported.basedir}/imported.properties"/>
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</project>
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</pre>
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<p>As explained above <code>${ant.file.imported}</code> stores the
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path of the build script, that defines the project called
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<code>imported</code>, (in short it stores the path to
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<code>imported.xml</code>) and <a
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href="dirname.html"><code><dirname></code></a> takes its
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directory. This technique also allows <code>imported.xml</code> to be
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used as a standalone file (without being imported in other
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project).</p>
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2003-07-09 16:24:38 +00:00
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<h3>Parameters</h3>
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<table border="1" cellpadding="2" cellspacing="0">
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<tbody>
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<tr>
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<td valign="top"><b>Attribute</b></td>
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<td valign="top"><b>Description</b></td>
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<td align="center" valign="top"><b>Required</b></td>
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</tr>
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<tr>
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<td valign="top">
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file
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</td>
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<td valign="top">
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The file to import. If this is a relative file name, the file name will be resolved
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relative to the <i>importing</i> file. <b>Note</b>, this is unlike most other
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ant file attributes, where relative files are resolved relative to ${basedir}.
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</td>
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<td valign="top" align="center">Yes</td>
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</tr>
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<tr>
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<td valign="top">
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optional
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</td>
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<td valign="top">
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If true, do not stop the build if the file does not exist,
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default is false.
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</td>
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<td valign="top" align="center">No</td>
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</tr>
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</tbody>
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</table>
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<h3>Examples</h3>
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<pre> <import file="../common-targets.xml"/>
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</pre>
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<p>Imports targets from the common-targets.xml file that is in a parent
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directory.</p>
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2004-11-19 09:07:12 +00:00
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<pre> <import file="${deploy-platform}.xml"/>
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</pre>
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<p>Imports the project defined by the property deploy-platform</p>
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<hr>
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<p align="center">Copyright © 2003-2005 The Apache Software
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Foundation. All rights
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Reserved.</p>
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</body>
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</html>
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