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122 lines
5.0 KiB
HTML
122 lines
5.0 KiB
HTML
<html>
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<head>
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<meta http-equiv="Content-Language" content="en-us">
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<title>Uptodate Task</title>
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</head>
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<body>
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<h2><a name="uptodate">Uptodate</a></h2>
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<h3>Description</h3>
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<p>Sets a property if a target file or set of target files is more up-to-date
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than a source file or set of source files. A single source file is specified
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using the <code>srcfile</code> attribute. A set of source files is specified
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using the nested <code><srcfiles></code>
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elements. These are <a href="../CoreTypes/fileset.html">FileSet</a>s,
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whereas multiple target files are specified using a nested
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<a href="../CoreTypes/mapper.html"><code><mapper></code></a> element.</p>
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<p>By default, the value of the property is set to <code>true</code> if
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the timestamp of the target file(s) is more recent than the timestamp of
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the corresponding source file(s). You can set the value to something other
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than the default by specifying the <code>value</code> attribute.</p>
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<p>If a <code><srcfiles></code> element is used, without also specifying
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a <code><mapper></code> element, the default behavior is to use a
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<a href="../CoreTypes/mapper.html#merge-mapper">merge mapper</a>, with the
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<code>to</code> attribute set to the value of the
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<code>targetfile</code> attribute.</p>
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<p>Normally, this task is used to set properties that are useful to avoid
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target execution depending on the relative age of the specified files.</p>
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<h3>Parameters</h3>
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<table border="1" cellpadding="2" cellspacing="0">
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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">property</td>
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<td valign="top">The name of the property to set.</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">value</td>
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<td valign="top">The value to set the property to.</td>
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<td valign="top" align="center">No; defaults to <code>true</code>.</td>
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</tr>
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<tr>
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<td valign="top">srcfile</td>
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<td valign="top">The file to check against the target file(s).</td>
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<td valign="top" align="center">Yes, unless a nested
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<code><srcfiles></code> element is present.</td>
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</tr>
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<tr>
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<td valign="top">targetfile</td>
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<td valign="top">The file for which we want to determine the status.</td>
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<td valign="top" align="center">Yes, unless a nested
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<code><mapper></code> element is present.</td>
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</tr>
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</table>
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<h3>Parameters specified as nested elements</h3>
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<h4><a name="srcfiles">srcfiles</a></h4>
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<p>The nested <code><srcfiles></code> element allows you to specify a
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set of files to check against the target file(s).</p>
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<p><strong>Note:</strong> You can specify either the <code>srcfile</code>
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attribute or nested <code><srcfiles></code> elements, but not both.
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<h4><a name="mapper">mapper</a></h4>
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<p>The nested <code><mapper></code> element allows you to specify
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a set of target files to check for being up-to-date with respect to a
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set of source files.</p>
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<h3>Examples</h3>
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<pre> <uptodate property="xmlBuild.notRequired" targetfile="${deploy}\xmlClasses.jar" >
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<srcfiles dir= "${src}/xml" includes="**/*.dtd"/>
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</uptodate></pre>
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<p>sets the property <code>xmlBuild.notRequired</code> to <code>true</code>
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if the <code>${deploy}/xmlClasses.jar</code> file is more up-to-date than
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any of the DTD files in the <code>${src}/xml</code> directory.</p>
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<p>This can be written as:</p>
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<pre> <uptodate property="xmlBuild.notRequired">
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<srcfiles dir= "${src}/xml" includes="**/*.dtd"/>
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<mapper type="merge" to="${deploy}\xmlClasses.jar"/>
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</uptodate></pre>
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as well.
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The <code>xmlBuild.notRequired</code> property can then be used in a
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<code><target></code> tag's <code>unless</code> attribute to
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conditionally run that target. For example, running the following target:</p>
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<pre>
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<target name="xmlBuild" depends="chkXmlBuild" unless="xmlBuild.notRequired">
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...
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</target>
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</pre>
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will first run the <code>chkXmlBuild</code> target, which contains
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the <code><uptodate></code> task that determines whether
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<code>xmlBuild.notRequired</code> gets set. The property named in
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the <code>unless</code> attribute is then checked for being set/not set.
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If it did get set (ie., the jar file is up-to-date),
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then the <code>xmlBuild</code> target won't be run.
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</p>
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<p> The following example shows a single source file being checked
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against a single target file:</p>
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<pre> <uptodate property="isUpToDate"
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srcfile="/usr/local/bin/testit"
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targetfile="${build}/.flagfile"/>
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</pre>
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<p>sets the property <code>isUpToDate</code> to <code>true</code>
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if <code>/usr/local/bin/testit</code> is newer than
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<code>${build}/.flagfile</code>.</p>
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</p>
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<hr>
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<p align="center">Copyright © 2000-2002 Apache Software Foundation.
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All rights Reserved.</p>
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</body>
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</html>
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