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<h2><a name="touch">Touch</a></h2>
<h3>Description</h3>

<p>Changes the modification time of a resource and possibly creates it
at the same time. In addition to working with a single file, this Task
can also work on <a href="../CoreTypes/resource.html">resource</a> and
resource collections (which also includes directories).  Prior to Ant
1.7 only FileSet or <a href="../CoreTypes/filelist.html">Filelist</a>
(since Ant 1.6) have been supported.</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">file</td>
    <td valign="top">The name of the file.</td>
    <td valign="top" align="center">Unless a nested resource collection element
       has been specified.</td>
  </tr>
  <tr>
    <td valign="top">millis</td>
    <td valign="top">Specifies the new modification time of the file
       in milliseconds since midnight Jan 1 1970.</td>
    <td valign="center" align="center" rowspan="2">No--datetime takes
       precedence, however if both are omitted the current time is assumed.</td>
  </tr>
  <tr>
    <td valign="top">datetime</td>
    <td valign="top">Specifies the new modification time of the file.</td>
  </tr>
  <tr>
    <td valign="top">pattern</td>
    <td valign="top">SimpleDateFormat-compatible pattern string.
       Defaults to MM/DD/YYYY HH:MM AM_or_PM or MM/DD/YYYY HH:MM:SS AM_or_PM.
       <b>Since Ant 1.6.3</b></td>
    <td valign="top" align="center">No</td>
  </tr>
  <tr>
    <td valign="top">mkdirs</td>
    <td valign="top">Whether to create nonexistent parent
       directories when touching new files. <b>Since Ant 1.6.3</b></td>
    <td valign="top" align="center">No, default <i>false</i>.</td>
  </tr>
  <tr>
    <td valign="top">verbose</td>
    <td valign="top">Whether to log the creation of new files.
       <b>Since Ant 1.6.3</b></td>
    <td valign="top" align="center">No, default <i>true</i>.</td>
  </tr>
</table>
<h3>Parameters specified as nested elements</h3>
<h4>any resource collection</h4>

<p>You can use any number of nested resource collection elements to
define the resource for this task and refer to resources defined
elsewhere.  <b>Note:</b> resource passed to this task must implement
the <code>org.apache.tools.ant.types.resources.Touchable</code>
interface, this is true for all filesystem-based resources like those
returned by path, fileset ot filelist.</p>

<p>For backwards compatibility directories matched by nested filesets
will be "touched" as well, use a &lt;type&gt; selector to suppress
this.  This only applies to filesets nested into the task directly,
not to filesets nested into a path or any other resource
collection.</p>

<h4>mapper</h4>
<p><em>Since Ant 1.6.3,</em> a nested <a href="../CoreTypes/mapper.html">
    mapper</a> can be specified.  Files specified via nested
    <code>fileset</code>s, <code>filelist</code>s, or the <code>file</code>
    attribute are mapped using the specified mapper.  For each file mapped,
    the resulting files are touched.  If the original file exists its
    timestamp will be used.  Otherwise the task settings (<code>millis</code>,
    <code>datetime</code>) take effect.</p>
<h3>Examples</h3>
<pre>  &lt;touch file=&quot;myfile&quot;/&gt;</pre>
<p>creates <code>myfile</code> if it doesn't exist and changes the
modification time to the current time.</p>
<pre>  &lt;touch file=&quot;myfile&quot; datetime=&quot;06/28/2000 2:02 pm&quot;/&gt;</pre>
<p>creates <code>myfile</code> if it doesn't exist and changes the
modification time to Jun, 28 2000 2:02 pm (14:02 for those used to 24
hour times).</p>
<pre>  &lt;touch datetime=&quot;09/10/1974 4:30 pm&quot;&gt;
    &lt;fileset dir=&quot;src_dir&quot;/&gt;
  &lt;/touch&gt;</pre>
<p>changes the modification time to Oct, 09 1974 4:30 pm of all files and directories 
  found in <code>src_dir</code>. </p>
<pre>  &lt;touch file=&quot;myfile&quot; datetime=&quot;06/28/2000 2:02:17 pm&quot;/&gt;</pre>
<p>creates <code>myfile</code> if it doesn't exist and changes the
modification time to Jun, 28 2000 2:02:17 pm (14:02:17 for those used to 24
hour times), if the filesystem allows a precision of one second - a
time close to it otherwise.</p>
<pre>  &lt;touch file=&quot;foo&quot;&gt;
    &lt;mapper type=&quot;glob&quot; from=&quot;foo&quot; to=&quot;bar&quot; /&gt;
  &lt;/touch&gt;
</pre>
<p>creates <code>bar</code> if it doesn't exist and changes the
modification time to that of <code>foo</code>.</p>


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