wangwei
/
antliscence
forked from youys/ant

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<html>

<head>
<meta http-equiv="Content-Language" content="en-us">
<link rel="stylesheet" type="text/css" href="../stylesheets/style.css">
<title>Resources and Resource Collections</title>
</head>

<body>

<h2 id="resource">Resources</h2>
<p>
A file-like entity can be abstracted to the concept of a <i>resource</i>.
In addition to providing access to file-like attributes, a resource
implementation should, when possible, provide the means to read content
from and/or write content to the underlying entity. Although the resource
concept was introduced in <i>Apache Ant 1.5.2</i>, resources are available for
explicit use beginning in <b>Ant 1.7</b>.
</p>

<h3>The built-in resource types are:</h3>

<ul>
  <li><a href="#basic">resource</a> - a basic resource.</li>
  <li><a href="#bzip2resource">bzip2resource</a> - a BZip2 compressed resource.</li>
  <li><a href="#file">file</a> - a file.</li>
  <li><a href="#gzipresource">gzipresource</a> - a GZip compressed resource.</li>
  <li><a href="#javaresource">javaresource</a> - a resource loadable
        via a Java classloader.</li>
  <li><a href="#javaconstant">javaconstant</a> - a constant in a class loadable
        via a Java classloader.</li>
  <li><a href="#propertyresource">propertyresource</a> - an Ant property.</li>
  <li><a href="#string">string</a> - a text string.</li>
  <li><a href="#tarentry">tarentry</a> - an entry in a tar file.</li>
  <li><a href="#url">url</a> - a URL.</li>
  <li><a href="#xzresource">xzresource</a> - an XZ compressed resource.</li>
  <li><a href="#zipentry">zipentry</a> - an entry in a zip file.</li>
</ul>

<h4 id="basic">resource</h4>

<p>A basic resource. Other resource types derive from this basic
type; as such all its attributes are available, though in most cases
irrelevant attributes will be ignored. This and all resource
implementations are also usable as single-element
<a href="#collection">Resource Collections</a>.
</p>

<table>
  <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 this resource</td>
    <td align="center" valign="top">No</td>
  </tr>
  <tr>
    <td valign="top">exists</td>
    <td valign="top">Whether this resource exists</td>
    <td align="center" valign="top">No, default <i>true</i></td>
  </tr>
  <tr>
    <td valign="top">lastmodified</td>
    <td valign="top">The last modification time of this resource</td>
    <td align="center" valign="top">No</td>
  </tr>
  <tr>
    <td valign="top">directory</td>
    <td valign="top">Whether this resource is directory-like</td>
    <td align="center" valign="top">No, default <i>false</i></td>
  </tr>
  <tr>
    <td valign="top">size</td>
    <td valign="top">The size of this resource</td>
    <td align="center" valign="top">No</td>
  </tr>
</table>

<h4 id="file">file</h4>

<p>Represents a file accessible via local filesystem conventions.</p>

<table>
  <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 file represented by this resource</td>
    <td align="center" valign="top">Yes</td>
  </tr>
  <tr>
    <td valign="top">basedir</td>
    <td valign="top">The base directory of this resource.  When this
      attribute is set, attempts to access the name of the resource
      will yield a path relative to this location.</td>
    <td align="center" valign="top">No</td>
  </tr>
</table>

<h4 id="javaresource">javaresource</h4>

<p>Represents a resource loadable via a Java classloader.</p>

<table>
  <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 resource.</td>
    <td align="center" valign="top">Yes</td>
  </tr>
  <tr>
    <td valign="top">classpath</td>
    <td valign="top">the classpath to use when looking up a resource.</td>
    <td align="center" valign="top">No</td>
  </tr>
  <tr>
    <td valign="top">classpathref</td>
    <td valign="top">the classpath to use when looking up a resource,
      given as <a href="../using.html#references">reference</a>
      to a <code>&lt;path&gt;</code> defined elsewhere..</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 resource, constructed from the specified classpath.</td>
    <td align="center" valign="top">No</td>
  </tr>
  <tr>
    <td valign="top">parentFirst</td>
    <td valign="top">Whether to consult the parent classloader first -
      the parent classloader most likely is the system classloader -
      when using a nested classpath.  Defaults
      to <code>true</code>.<br/>
      <em>Since Ant 1.8.0</em></td>
    <td align="center" valign="top">No</td>
  </tr>
</table>

<p>The classpath can also be specified as nested classpath element,
where <b>&lt;classpath&gt;</b> is a <a
href="../using.html#path">path-like structure</a>.</p>

<h4 id="javaconstant">javaconstant</h4>
<p>Loads the value of a java constant. As a specialisation of
<a href="#javaresource">javaresource</a> all of its attributes and nested elements are
supported. A constant must be specified as <tt>public static</tt> otherwise it could not be loaded.</p>

<table>
  <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 resource. Must be specified as full qualified
      field name.
    </td>
    <td align="center" valign="top">Yes</td>
  </tr>
</table>
<h5>Examples</h5>
This loads the value of the constant <tt>VERSION</tt> of the <tt>org.acme.Main</tt> class
into the <tt>version</tt>-property. The classpath for finding that class is provided via
nested classpath element.
<pre><code>&lt;loadresource property=&quot;version&quot;&gt;
   &lt;javaconstant name=&quot;org.acme.Main.VERSION&quot;&gt;
     &lt;classpath&gt;
       &lt;pathelement location=&quot;${acme.lib.dir}&quot;/&gt;
     &lt;/classpath&gt;
   &lt;/javaconstant&gt;
 &lt;/loadresource&gt;
</code></pre>

Create a new file <tt>c:/temp/org.apache.tools.ant.Main.DEFAULT_BUILD_FILENAME</tt> with the content
of that constant (<tt>build.xml</tt>).
<pre><code>&lt;copy todir=&quot;c:/temp&quot;&gt;
  &lt;javaconstant name=&quot;org.apache.tools.ant.Main.DEFAULT_BUILD_FILENAME&quot;/&gt;
&lt;/copy&gt;</code></pre>

<h4 id="zipentry">zipentry</h4>

<p>Represents an entry in a ZIP archive. The archive can be specified
using the archive attribute or a nested single-element resource
collection.  <code>zipentry</code> only supports file system resources
as nested elements.</p>

<table>
  <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">zipfile or its alias name archive</td>
    <td valign="top">The zip file containing this resource</td>
    <td align="center" valign="top">Yes, unless a nested resource
    collection has been specified.</td>
  </tr>
  <tr>
    <td valign="top">name</td>
    <td valign="top">The name of the archived resource</td>
    <td align="center" valign="top">Yes</td>
  </tr>
  <tr>
    <td valign="top">encoding</td>
    <td valign="top">The encoding of the zipfile</td>
    <td align="center" valign="top">No;
      platform default used if unspecified</td>
  </tr>
</table>

<h4 id="tarentry">tarentry</h4>

<p>Represents an entry in a TAR archive.  The archive can be specified
using the archive attribute or a nested single-element resource
collection.</p>

<table>
  <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">archive</td>
    <td valign="top">The tar archive containing this resource</td>
    <td align="center" valign="top">Yes, unless a nested resource
    collection has been specified.</td>
  </tr>
  <tr>
    <td valign="top">name</td>
    <td valign="top">The name of the archived resource</td>
    <td align="center" valign="top">Yes</td>
  </tr>
</table>

<h4 id="gzipresource">gzipresource</h4>

<p>This is not a stand-alone resource, but a wrapper around another
resource providing compression of the resource's contents on the fly.
A single element resource collection must be specified as a nested
element.</p>

<h4 id="bzip2resource">bzip2resource</h4>

<p>This is not a stand-alone resource, but a wrapper around another
resource providing compression of the resource's contents on the fly.
A single element resource collection must be specified as a nested
element.</p>

<h4 id="xzresource">xzresource</h4>

<p>This is not a stand-alone resource, but a wrapper around another
resource providing compression of the resource's contents on the fly.
A single element resource collection must be specified as a nested
element.</p>

<p>XZ compression support has been added with Apache Ant 1.10.1 and
depends on external libraries not included in the Ant distribution.
See <a href="../install.html#librarydependencies">Library
Dependencies</a> for more information.</p>

<h4 id="url">url</h4>

<p>Represents a URL.</p>

<table>
  <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">url</td>
    <td valign="top">The url to expose</td>
    <td rowspan="3" align="center" valign="middle">Exactly one of these</td>
  </tr>
  <tr>
    <td valign="top">file</td>
    <td valign="top">The file to expose as a file: url</td>
  </tr>
  <tr>
    <td valign="top">baseUrl</td>
    <td valign="top">The base URL which must be combined with relativePath</td>
 </tr>
  <tr>
    <td valign="top">relativePath</td>
    <td valign="top">Relative path that defines the url combined with
      baseUrl</td>
    <td align="center" valign="top">If using baseUrl</td>
  </tr>
</table>

<h4 id="string">string</h4>

<p>Represents a Java String. It can be written to, but only once, after which
it will be an error to write to again.</p>

<table>
  <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">value</td>
    <td valign="top">The value of this resource</td>
    <td align="center" valign="top">No</td>
  </tr>
</table>

<p>The resource also supports nested text, which can only be supplied if the <code>value</code> attribute is unset:
  </p>
<pre>
  &lt;string>
        self.log("Ant version =${ant.version}");
  &lt;/string>
</pre>

<h4 id="propertyresource">propertyresource</h4>

<p>Represents an Ant property.</p>

<table>
  <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 property name</td>
    <td align="center" valign="top">Yes</td>
  </tr>
</table>

<hr/>
<h2 id="collection">Resource Collections</h2>
<p>
A Resource Collection is an abstraction of an entity that groups
together a number of <a href="#resource">resources</a>. Several of
Ant's "legacy" datatypes have been modified to behave as Resource Collections:
</p>
<ul>
  <li><a href="fileset.html">fileset</a>,
    <a href="dirset.html">dirset</a>,
    <a href="multirootfileset.html">multirootfileset</a>,
    <a href="filelist.html">filelist</a>, and
    <a href="../using.html#path">path</a>
    (and derivative types) expose <a href="#file">file</a> resources
  </li>
  <li><a href="tarfileset.html">tarfileset</a>
    can expose <a href="#file">file</a> or <a href="#tarentry">tarentry</a>
    resources depending on configuration
  </li>
  <li><a href="zipfileset.html">zipfileset</a>
    can expose <a href="#file">file</a> or <a href="#zipentry">zipentry</a>
    resources depending on configuration
  </li>
  <li><a href="propertyset.html">propertyset</a>
    exposes <a href="#propertyresource">property</a> resources
  </li>
</ul>
<p>Strangely, some tasks can even legitimately behave as resource collections:</p>
<ul>
  <li><a href="../Tasks/concat.html">concat</a>
    exposes a concatenated resource, and adds e.g.
    <a href="filterchain.html">filtering</a>
    to Ant's resource-related capabilities.
  </li>
</ul>
<h3>The additional built-in resource collections are:</h3>
<ul>
  <li><a href="#resources">resources</a> - generic resource collection</li>
  <li><a href="#files">files</a> - collection of files similar to
    <a href="fileset.html">fileset</a></li>
  <li><a href="#restrict">restrict</a> - restrict a resource collection
    to include only resources meeting specified criteria</li>
  <li><a href="#sort">sort</a> - sorted resource collection</li>
  <li><a href="#first">first</a> - first <i>n</i> resources from a
    nested collection</li>
  <li><a href="#last">last</a> - last <i>n</i> resources from a
    nested collection</li>
  <li><a href="#allbutfirst">allbutfirst</a> - all except the
    first <i>n</i> resources from a nested collection</li>
  <li><a href="#allbutlast">allbutlast</a> - all except the last <i>n</i>
    resources from a nested collection</li>
  <li><a href="#tokens">tokens</a> - <a href="#string">string</a> tokens
    gathered from a nested collection</li>
  <li><a href="#union">union</a> - set union of nested resource collections</li>
  <li><a href="#intersect">intersect</a> - set intersection
    of nested resource collections</li>
  <li><a href="#difference">difference</a> - set difference
    of nested resource collections</li>
  <li><a href="#mappedresources">mappedresources</a> - generic
    resource collection wrapper that maps the names of the nested
    resources using a <a href="mapper.html">mapper</a>.</li>
  <li><a href="#archives">archives</a> - wraps around different
    resource collections and treats the nested resources as ZIP or TAR
    archives that will be extracted on the fly.</li>
  <li><a href="#resourcelist">resourcelist</a> - a collection of
    resources whose names have been read from another resource.</li>
</ul>

<h4 id="resources">resources</h4>
<p>A generic resource collection, designed for use with
  <a href="../using.html#references">references</a>.
  For example, if a third-party Ant task generates a Resource Collection
  of an unknown type, it can still be accessed via a
  <code>&lt;resources&gt;</code> collection. The secondary use of this
  collection type is as a container of other resource collections,
  preserving the order of nested collections as well as
  duplicate resources (contrast with <a href="#union">union</a>).
</p>
<blockquote>
  <table>
    <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">cache</td>
      <td valign="top">Whether to cache results.  <em>since Ant 1.8.0</em></td>
      <td valign="top" align="center">No, default <i>false</i></td>
    </tr>
  </table>
</blockquote>

<h4 id="files">files</h4>
<p>A group of files. These files are matched by <b>absolute</b> patterns
  taken from a number of <a href="patternset.html">PatternSets</a>.
  These can be specified as nested <code>&lt;patternset&gt;</code>
  elements. In addition, <code>&lt;files&gt;</code> holds an implicit
  PatternSet and supports the nested <code>&lt;include&gt;</code>,
  <code>&lt;includesfile&gt;</code>, <code>&lt;exclude&gt;</code>
  and <code>&lt;excludesfile&gt;</code> elements of PatternSet directly,
  as well as PatternSet's attributes.
</p>
<p><a href="selectors.html">File Selectors</a> are available as nested
  elements. A file must be selected by all selectors in order to be included;
  <code>&lt;files&gt;</code> is thus equivalent to an
  <code>&lt;and&gt;</code> file selector container.
</p>
<p><b>More simply put</b>, this type is equivalent to a
  <a href="fileset.html">fileset</a> with no base directory.
  <b>Please note</b> that without a base directory,
  filesystem scanning is based entirely on include and exclude patterns.
  A <a href="selectors.html#filenameselect">filename</a> (or any)
  selector can <i>only</i> influence the scanning process <i>after</i>
  the file has been included based on pattern-based selection.
</p>

<table>
  <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">includes</td>
    <td valign="top">comma- or space-separated list of patterns
      of files that must be included</td>
    <td rowspan="2" valign="middle" align="center">At least one of these</td>
  </tr>
  <tr>
    <td valign="top">includesfile</td>
    <td valign="top">the name of a file; each line of this file is
      taken to be an include pattern.</td>
  </tr>
  <tr>
    <td valign="top">excludes</td>
    <td valign="top">comma- or space-separated list of patterns
      of files that must be excluded</td>
    <td rowspan="2" valign="top" align="center">No, default none
      (except default excludes when true)</td>
  </tr>
  <tr>
    <td valign="top">excludesfile</td>
    <td valign="top">the name of a file; each line of this file is
      taken to be an exclude pattern.</td>
  </tr>
  <tr>
    <td valign="top">defaultexcludes</td>
    <td valign="top">Whether
      <a href="../dirtasks.html#defaultexcludes">default excludes</a>
      should be used</td>
    <td valign="top" align="center">No, default <i>true</i></td>
  </tr>
  <tr>
    <td valign="top">casesensitive</td>
    <td valign="top">Whether patterns are case-sensitive</td>
    <td valign="top" align="center">No, default <i>true</i></td>
  </tr>
  <tr>
    <td valign="top">followsymlinks</td>
    <td valign="top">Whether to follow symbolic links
      (see note <a href="#symlink">below</a>)</td>
    <td valign="top" align="center">No, default <i>true</i></td>
  </tr>
</table>

<p id="symlink"><b>Note</b>: All files/directories for which
the canonical path is different from its path are considered symbolic
links.  On Unix systems this usually means the file really is a
symbolic link but it may lead to false results on other
platforms.
</p>

<h4 id="restrict">restrict</h4>
<p>Restricts a nested resource collection using resource selectors:
  <table>
    <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">cache</td>
      <td valign="top">Whether to cache results; disabling
        may seriously impact performance</td>
      <td valign="top" align="center">No, default <i>true</i></td>
    </tr>
  </table>
  <h5>Parameters specified as nested elements</h5>
  <p>A single resource collection is required.</p>
  <p>Nested resource selectors are used to "narrow down" the included
    resources, combined via a logical <i>AND</i>. These are patterned
    after <a href="selectors.html">file selectors</a> but are,
    unsurprisingly, targeted to resources.
    Several built-in resource selectors are available in the internal
    <a href="antlib.html">antlib</a>
    <code>org.apache.tools.ant.types.resources.selectors</code>:
  </p>

  <ul>
    <li><a href="#rsel.name">name</a> - select resources by name.</li>
    <li><a href="#rsel.exists">exists</a> - select existing resources.</li>
    <li><a href="#rsel.date">date</a> - select resources by date.</li>
    <li><a href="#rsel.type">type</a> - select resources by type.</li>
    <li><a href="#rsel.size">size</a> - select resources by size.</li>
    <li><a href="#rsel.instanceof">instanceof</a>
      - select resources by class or Ant datatype.</li>
    <li><a href="#rsel.and">and</a> - "and" nested resource selectors.</li>
    <li><a href="#rsel.or">or</a> - "or" nested resource selectors.</li>
    <li><a href="#rsel.not">not</a> - "not" a nested resource selector.</li>
    <li><a href="#rsel.none">none</a>
      - select resources selected by no nested resource selectors.</li>
    <li><a href="#rsel.majority">majority</a> - select resources selected
      by a majority of nested resource selectors.</li>
    <li><a href="selectors.html#modified">modified</a> - select resources which
      content has changed.</li>
    <li><a href="selectors.html#containsselect">contains</a> - select resources
      containing a particular text string.</li>
    <li><a href="selectors.html#regexpselect">containsregexp</a> - select
      resources whose contents match a particular regular expression.</li>
    <li><a href="#rsel.compare">compare</a> - select resources
      based on comparison to other resources.</li>
    <li><a href="selectors.html#readable">readable</a> -
      Select files (resources must be files) if they are readable.</li>
    <li><a href="selectors.html#writable">writable</a> -
      Select files (resources must be files) if they are writable.</li>
  </ul>

  <h5 id="rsel.name">name</h5>
  <p>Selects resources by name.</p>
  <table>
    <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 pattern to test using standard Ant
        patterns.</td>
      <td valign="top" align="center" rowspan="2">Exactly one of
        the two</td>
    </tr>
    <tr>
      <td valign="top">regex</td>
      <td valign="top">The regular expression matching files to select.</td>
    </tr>
    <tr>
      <td valign="top">casesensitive</td>
      <td valign="top">Whether name comparisons are case-sensitive</td>
      <td align="center" valign="top">No, default <i>true</i></td>
    </tr>
    <tr>
      <td valign="top">handledirsep</td>
      <td valign="top">
        If this is specified, the mapper will treat a \ character in a
        resource name or name attribute as a / for the purposes of
        matching.  This attribute can be true or false, the default is
        false.
        <em>Since Ant 1.8.0</em>
        <td align="center" valign="top">No</td>
      </tr>
  </table>

  <h5 id="rsel.exists">exists</h5>
  <p>Selects existing resources.</p>

  <h5 id="rsel.date">date</h5>
  <p>Selects resources by date.</p>
  <table>
    <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">millis</td>
      <td valign="top">The comparison date/time in ms since January 1, 1970</td>
      <td rowspan="2" align="center" valign="middle">One of these</td>
    </tr>
    <tr>
      <td valign="top">datetime</td>
      <td valign="top">The formatted comparison date/time</td>
    </tr>
    <tr>
      <td valign="top">pattern</td>
      <td valign="top">SimpleDateFormat-compatible pattern
        for use with the <code>datetime</code> attribute using the
        current locale</td>
      <td align="center" valign="top">
        No, default is "MM/dd/yyyy hh:mm a" using the US locale</td>
    </tr>
    <tr>
      <td valign="top">granularity</td>
      <td valign="top">The number of milliseconds leeway to use when
        comparing file modification times. This is needed because not
        every file system supports tracking the last modified time to
        the millisecond level.</td>
      <td align="center" valign="top">No; default varies by platform:
        FAT filesystems = 2 sec; Unix = 1 sec; NTFS = 1 ms.</td>
    </tr>
    <tr>
      <td valign="top">when</td>
      <td valign="top">One of "before", "after", "equal"</td>
      <td align="center" valign="top">No, default "equal"</td>
    </tr>
  </table>

  <h5 id="rsel.type">type</h5>
  <p>Selects resources by type (file or directory).</p>
  <table>
    <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">type</td>
      <td valign="top">One of "file", "dir", "any" (<em>since Ant 1.8</em>)</td>
      <td align="center" valign="top">Yes</td>
    </tr>
  </table>

  <h5 id="rsel.size">size</h5>
  <p>Selects resources by size.</p>
  <table>
    <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">size</td>
      <td valign="top">The size to compare</td>
      <td align="center" valign="top">Yes</td>
    </tr>
    <tr>
      <td valign="top">when</td>
      <td valign="top">One of "equal", "eq", "greater", "gt", "less", "lt",
        "ge" (greater or equal), "ne" (not equal), "le" (less or equal)</td>
      <td align="center" valign="top">No, default "equal"</td>
    </tr>
  </table>

  <h5 id="rsel.instanceof">instanceof</h5>
  <p>Selects resources by type.</p>
  <table>
    <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">class</td>
      <td valign="top">The class of which the resource must be an instance</td>
      <td rowspan="2" align="center" valign="middle">One of these</td>
    </tr>
    <tr>
      <td valign="top">type</td>
      <td valign="top">The Ant type that must
        be assignable from the resource</td>
    </tr>
    <tr>
      <td valign="top">uri</td>
      <td valign="top">The uri in which <i>type</i> must be defined</td>
      <td valign="top">No</td>
    </tr>
  </table>

  <h5 id="rsel.and">and</h5>
  <p>Selects a resource if it is selected by all nested resource selectors.</p>

  <h5 id="rsel.or">or</h5>
  <p>Selects a resource if it is selected
    by at least one nested resource selector.</p>

  <h5 id="rsel.not">not</h5>
  <p>Negates the selection result of the single
    nested resource selector allowed.</p>

  <h5 id="rsel.none">none</h5>
  <p>Selects a resource if it is selected
    by no nested resource selectors.</p>

  <h5 id="rsel.majority">majority</h5>
  <p>Selects a resource if it is selected
    by the majority of nested resource selectors.</p>
  <table>
    <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">allowtie</td>
      <td valign="top">Whether a tie (when there is an even number
        of nested resource selectors) is considered a majority</td>
      <td valign="top">No, default <i>true</i></td>
    </tr>
  </table>

  <h5 id="rsel.compare">compare</h5>
  <p>Selects a resource based on its comparison to one or more "control"
     resources using nested <a href="#rcmp">resource comparators</a>.</p>
  <table>
    <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">when</td>
      <td valign="top">Comparison ("equal"/"eq", "greater"/"gt", "less"/"lt",
        "le" (less or equal), "ge" (greater or equal), "ne" (not equal).</td>
      <td valign="top">No, default "equal"</td>
    </tr>
    <tr>
      <td valign="top">against</td>
      <td valign="top">Quantifier ("all"/"each"/"every", "any"/"some",
        (exactly) "one", "most"/"majority", "none".</td>
      <td valign="top">No, default "all"</td>
    </tr>
  </table>
  <h6>Parameters specified as nested elements</h6>
  <p>The resources against which comparisons will be made must be specified
    using the nested &lt;control&gt; element, which denotes a
    <a href="#resources">resources</a> collection.</p>
  <h6>Examples</h6>
  <p>Assuming the namespace settings</p>
<pre><code>  rsel="antlib:org.apache.tools.ant.types.resources.selectors"
  rcmp="antlib:org.apache.tools.ant.types.resources.comparators"
</code></pre>
  <pre>
&lt;restrict&gt;
  &lt;fileset dir="src" includes="a,b,c,d,e,f,g" /&gt;
  &lt;rsel:compare when="le" against="all"&gt;
    &lt;control&gt;
      &lt;resource name="d" /&gt;
    &lt;/control&gt;
    &lt;rcmp:name /&gt;
  &lt;/rsel:compare&gt;
&lt;/restrict&gt;
  </pre>
  <p>Selects files a, b, c, and d.</p>
  <pre>
    &lt;project rsel=&quot;antlib:org.apache.tools.ant.types.resources.selectors&quot;&gt;
        &lt;macrodef name=&quot;copyFromPath&quot;&gt;
            &lt;attribute name=&quot;todir&quot;/&gt;
            &lt;attribute name=&quot;refid&quot;/&gt;
            &lt;element name=&quot;nested-resource-selectors&quot; optional=&quot;yes&quot; implicit=&quot;true&quot;/&gt;
            &lt;sequential&gt;
                &lt;mkdir dir=&quot;@{todir}&quot; taskname=&quot;copyFromPath&quot;/&gt;
                &lt;copy todir=&quot;@{todir}&quot; taskname=&quot;copyFromPath&quot;&gt;
                    &lt;restrict&gt;
                        &lt;path refid=&quot;@{refid}&quot;/&gt;
                        &lt;rsel:or&gt;
                            &lt;nested-resource-selectors/&gt;
                        &lt;/rsel:or&gt;
                    &lt;/restrict&gt;
                    &lt;flattenmapper/&gt;
                &lt;/copy&gt;
            &lt;/sequential&gt;
        &lt;/macrodef&gt;
        &lt;copyFromPath refid=&quot;classpath&quot; todir=&quot;todir&quot;&gt;
            &lt;rsel:name name=&quot;log4j.properties&quot;/&gt;
            &lt;rsel:name name=&quot;default.properties&quot;/&gt;
        &lt;/copyFromPath&gt;
     &lt;/project&gt;
  </pre>
  <p>Creates the <tt>todir</tt> directory and copies (if present) the
     files <tt>log4j.properties</tt> and <tt>default.properties</tt>
     from the Classpath (already used while compiling).
  </p>

  <pre>
  &lt;project&gt;
      &lt;filelist id=&quot;allfiles&quot; dir=&quot;${ant.home}/bin&quot; files=&quot;ant.cmd,foo.txt,ant.bat,bar.txt,ant&quot;/&gt;
      &lt;restrict id=&quot;missingfiles&quot;&gt;
          &lt;filelist refid=&quot;allfiles&quot;/&gt;
          &lt;rsel:not xmlns:rsel=&quot;antlib:org.apache.tools.ant.types.resources.selectors&quot;&gt;
              &lt;rsel:exists/&gt;
          &lt;/rsel:not&gt;
      &lt;/restrict&gt;
      &lt;echo&gt;These files are missed: ${toString:missingfiles}&lt;/echo&gt;
  &lt;/project&gt;
  </pre>
  <p>The resource collection <i>allfiles</i> defines a list of files which are expected. The restrict
  <i>missingfiles</i> uses the <tt>&lt;not&gt;&lt;exists&gt;</tt> selector for getting all files
  which are not present. Finally we use the <i>toString:</i> <a href="../using.html#pathshortcut">pathshortcut</a> for
  getting them in a readable form: <tt>[echo] These files are missed: ....foo.txt;....bar.txt</tt></p>

<h4 id="sort">sort</h4>

<p>Sorts a nested resource collection according to the resources'
   natural order, or by one or more nested <a href="#rcmp">resource
   comparators</a>:</p>
  <table>
    <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">cache</td>
      <td valign="top">Whether to cache results; disabling
        may seriously impact performance</td>
      <td valign="top" align="center">No, default <i>true</i></td>
    </tr>
  </table>
  <h5>Parameters specified as nested elements</h5>
  <p>A single resource collection is required.</p>
  <p>The sort can be controlled and customized by specifying one or more
    resource comparators. Resources can be sorted according to multiple
    criteria; the first specified is the "outermost", while the last
    specified is the "innermost". Several built-in resource comparators
    are available in the internal <a href="antlib.html">antlib</a>
    <code>org.apache.tools.ant.types.resources.comparators</code>:
  </p>
  <h5 id="rcmp">Resource Comparators:</h5>
  <ul>
    <li><a href="#rcmp.name">name</a> - sort resources by name</li>
    <li><a href="#rcmp.exists">exists</a> - sort resources by existence</li>
    <li><a href="#rcmp.date">date</a> - sort resources by date</li>
    <li><a href="#rcmp.type">type</a> - sort resources by type</li>
    <li><a href="#rcmp.size">size</a> - sort resources by size</li>
    <li><a href="#rcmp.content">content</a> - sort resources by content</li>
    <li><a href="#rcmp.reverse">reverse</a> - reverse the natural sort order,
      or that of a single nested resource comparator</li>
  </ul>

  <h6 id="rcmp.name">name</h6>
  <p>Sort resources by name.</p>

  <h6 id="rcmp.exists">exists</h6>
  <p>Sort resources by existence.
    Not existing is considered "less than" existing.</p>

  <h6 id="rcmp.date">date</h6>
  <p>Sort resources by date.</p>

  <h6 id="rcmp.type">type</h6>
  <p>Sort resources by type (file or directory).
    Because directories contain files, they are considered "greater".</p>

  <h6 id="rcmp.size">size</h6>
  <p>Sort resources by size.</p>

  <h6 id="rcmp.content">content</h6>
  <p>Sort resources by content.</p>
  <table>
    <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">binary</td>
      <td valign="top">Whether content should be compared in binary mode.
        If <i>false</i>, content will be compared without regard to
        platform-specific line-ending conventions.</td>
      <td valign="top">No, default <i>true</i></td>
    </tr>
  </table>

  <h6 id="rcmp.reverse">reverse</h6>
  <p>Reverse the natural sort order, or that of a single nested comparator.</p>

  <h5>Examples</h5>
  <pre>
    &lt;property name=&quot;eol&quot; value=&quot;${line.separator}&quot; /&gt;
    &lt;pathconvert property=&quot;sorted&quot; pathsep=&quot;${eol}&quot;&gt;
      &lt;sort&gt;
        &lt;tokens&gt;
          &lt;string value=&quot;foo bar etc baz&quot; /&gt;
          &lt;stringtokenizer /&gt;
        &lt;/tokens&gt;
      &lt;/sort&gt;
    &lt;/pathconvert&gt;</pre>
  <p>The resource of type string &quot;foo bar etc baz&quot; is split into four tokens by
  the stringtokenizer. These tokens are sorted and there <i>sorted</i> gets the value
  of &quot;bar baz etc foo&quot;.</p>

  <pre>
    &lt;sort&gt;
      &lt;fileset dir=&quot;foo&quot; /&gt;
      &lt;reverse xmlns=&quot;antlib:org.apache.tools.ant.types.resources.comparators&quot;&gt;
        &lt;date /&gt;
      &lt;/reverse&gt;
    &lt;/sort&gt;</pre>
  <p>This takes all files from <i>foo</i>
     and sorts them by modification date in reverse order.
     Because the resource comparators used (<code>&lt;reverse&gt;</code>
     and <code>&lt;date&gt;</code>) are in an internal antlib
     their namespace must be set explicitly.
  </p>

<h4 id="first">first</h4>
<p>Includes the first <i>count</i> resources from a nested resource collection.
This can be used in conjunction with the <a href="#sort">sort</a> collection,
for example, to select the first few oldest, largest, etc. resources from a
larger collection.</p>
  <table>
    <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">count</td>
      <td valign="top">The number of resources to include</td>
      <td valign="top" align="center">No, default 1</td>
    </tr>
    <tr>
      <td valign="top">cache</td>
      <td valign="top">Whether to cache results; disabling
        may seriously impact performance</td>
      <td valign="top" align="center">No, default <i>true</i></td>
    </tr>
  </table>
  <h5>Parameters specified as nested elements</h5>
  <p>A single resource collection is required.</p>

<h4 id="last">last</h4>
<p>Includes the last <i>count</i> resources from a nested resource collection.
This can be used in conjunction with the <a href="#sort">sort</a> collection,
for example, to select the last few oldest, largest, etc. resources from a
larger collection. <em>Since Ant 1.7.1</em></p>
  <table>
    <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">count</td>
      <td valign="top">The number of resources to include</td>
      <td valign="top" align="center">No, default 1</td>
    </tr>
    <tr>
      <td valign="top">cache</td>
      <td valign="top">Whether to cache results; disabling
        may seriously impact performance</td>
      <td valign="top" align="center">No, default <i>true</i></td>
    </tr>
  </table>
  <h5>Parameters specified as nested elements</h5>
  <p>A single resource collection is required.</p>

<h4 id="allbutfirst">allbutfirst</h4>
<p>Includes all elements except for the first <i>count</i> resources
from a nested resource collection.  This can be used in conjunction
with the <a href="#sort">sort</a> collection, for example, to select
all but the first few oldest, largest, etc. resources from a larger
collection. <em>Since Ant 1.9.5</em></p>
  <table>
    <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">count</td>
      <td valign="top">The number of resources to exclude</td>
      <td valign="top" align="center">No, default 1</td>
    </tr>
    <tr>
      <td valign="top">cache</td>
      <td valign="top">Whether to cache results; disabling
        may seriously impact performance</td>
      <td valign="top" align="center">No, default <i>true</i></td>
    </tr>
  </table>
  <h5>Parameters specified as nested elements</h5>
  <p>A single resource collection is required.</p>

<h4 id="allbutlast">allbutlast</h4>
<p>Includes all elements except for the last <i>count</i> resources
from a nested resource collection.  This can be used in conjunction
with the <a href="#sort">sort</a> collection, for example, to select
all but the last few oldest, largest, etc. resources from a larger
collection. <em>Since Ant 1.9.5</em></p>
  <table>
    <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">count</td>
      <td valign="top">The number of resources to exclude</td>
      <td valign="top" align="center">No, default 1</td>
    </tr>
    <tr>
      <td valign="top">cache</td>
      <td valign="top">Whether to cache results; disabling
        may seriously impact performance</td>
      <td valign="top" align="center">No, default <i>true</i></td>
    </tr>
  </table>
  <h5>Parameters specified as nested elements</h5>
  <p>A single resource collection is required.</p>

<h4 id="tokens">tokens</h4>
<p>Includes the <a href="#string">string</a> tokens gathered from a nested
 resource collection. Uses the same tokenizers supported by the
<a href="filterchain.html#tokenfilter">TokenFilter</a>. Imaginative
  use of this resource collection can implement equivalents for such Unix
  functions as <code>sort</code>, <code>grep -c</code>, <code>wc</code> and
  <code>wc -l</code>.</p>
  <table>
    <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">encoding</td>
      <td valign="top">The encoding of the nested resources</td>
      <td valign="top" align="center">No, default is platform default</td>
    </tr>
    <tr>
      <td valign="top">cache</td>
      <td valign="top">Whether to cache results; disabling
        may seriously impact performance</td>
      <td valign="top" align="center">No, default <i>true</i></td>
    </tr>
  </table>
  <h5>Parameters specified as nested elements</h5>
  <ul>
    <li>A single resource collection is required.</li>
    <li>One nested tokenizer may be specified.  If omitted, a
        <a href="filterchain.html#linetokenizer">LineTokenizer</a> will be used.
    </li>
  </ul>
  <h5>Examples</h5>
  <pre>&lt;concat&gt;
  &lt;union&gt;
    &lt;sort&gt;
      &lt;tokens&gt;
        &lt;resources refid="input" /&gt;
        &lt;linetokenizer includedelims="true" /&gt;
      &lt;/tokens&gt;
    &lt;/sort&gt;
  &lt;/union&gt;
&lt;/concat&gt;
  </pre>
  <p>Implements Unix <i>sort -u</i> against resource collection <i>input</i>.</p>

<h4 id="setlogic">Set operations</h4>
  <p>The following resource collections implement set operations:</p>
  <ul>
    <li><a href="#union">union</a></li>
    <li><a href="#intersect">intersect</a></li>
    <li><a href="#difference">difference</a></li>
  </ul>

  <h4 id="union">union</h4>
  <p>Union of nested resource collections.</p>

  <h4 id="intersect">intersect</h4>
  <p>Intersection of nested resource collections.</p>

  <h4 id="difference">difference</h4>
  <p>Difference of nested resource collections.</p>

  <p>The following attributes apply to all set-operation resource collections:
  </p>
  <table>
    <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">cache</td>
      <td valign="top">Whether to cache results; disabling
        may seriously impact performance</td>
      <td valign="top" align="center">No, default <i>true</i></td>
    </tr>
  </table>

  <h5>Examples</h5>
  <pre>
    &lt;resources id=&quot;A&quot;&gt;
        &lt;string value=&quot;a&quot;/&gt;
        &lt;string value=&quot;b&quot;/&gt;
    &lt;/resources&gt;
    &lt;resources id=&quot;B&quot;&gt;
        &lt;string value=&quot;b&quot;/&gt;
        &lt;string value=&quot;c&quot;/&gt;
    &lt;/resources&gt;
    &lt;union id=&quot;union&quot;&gt;&lt;resources refid=&quot;A&quot;/&gt;&lt;resources refid=&quot;B&quot;/&gt;&lt;/union&gt;
    &lt;intersect id=&quot;intersect&quot;&gt;&lt;resources refid=&quot;A&quot;/&gt;&lt;resources refid=&quot;B&quot;/&gt;&lt;/intersect&gt;
    &lt;difference id=&quot;difference&quot;&gt;&lt;resources refid=&quot;A&quot;/&gt;&lt;resources refid=&quot;B&quot;/&gt;&lt;/difference&gt;
    &lt;echo&gt;
      A: ${toString:A}                    = a;b
      B: ${toString:B}                    = b;c

      union     : ${toString:union}       = a;b;c
      intersect : ${toString:intersect}   = b
      difference: ${toString:difference}  = a;c
    &lt;/echo&gt;
  </pre>

<h4 id="mappedresources">mappedresources</h4>

<p><em>Since Ant 1.8.0</em></p>

<p>Wraps another resource collection and maps the names of the nested
  resources using a <a href="mapper.html">mapper</a>.</p>

<p>Even if <em>mappedresources</em> wraps a resource collection that
  consists of file-system based resources, <em>mappedresources</em>
  will not appear to be file-system based.  This means you can't
  use <em>mappedresources</em> with tasks that only allow file-system
  based resources.</p>

  <h5>Parameters specified as attributes</h5>

  <table>
    <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">cache</td>
      <td valign="top">Whether to cache results; enabling
        may improve performance.  <em>Since Ant 1.8.1</em></td>
      <td valign="top" align="center">No, default <i>false</i></td>
    </tr>
    <tr>
      <td valign="top">enablemultiplemappings</td>
      <td valign="top">
        If true the the collection will use all the mappings for a
        given source path. If false the it will only process the first
        resource.
        <em>since Ant 1.8.1</em></td>
      <td align="center">No - defaults to false.</td>
    </tr>
  </table>

  <h5>Parameters specified as nested elements</h5>
  <p>A single resource collection is required.</p>
  <p>A single <a href="mapper.html">mapper</a> can be used to map
    names.  If no mapper has been given (which doesn't make any sense,
    honestly), an identity mapper will be used.</p>

  <h5>Examples</h5>

  <p>Copies all files from a given directory to a target directory
    adding ".bak" as an extension.  Note this could be done with a
    <em>mapper</em> nested into <em>copy</em> directly as well.</p>

  <pre>
    &lt;copy todir="${target}"&gt;
      &lt;mappedresources&gt;
        &lt;fileset dir="${src}"/&gt;
        &lt;globmapper from="*" to="*.bak"/&gt;
      &lt;/mappedresources&gt;
    &lt;/copy&gt;
  </pre>

  <p>Creates a WAR archive adding all CLASSPATH entries that are files
    to the <code>WEB-INF/lib</code> directory without keeping their
    files-system structure.</p>

  <pre>
    &lt;war destfile="${output}"&gt;
      &lt;mappedresources&gt;
        &lt;restrict&gt;
          &lt;path path="${java.class.path}"/&gt;
          &lt;type type="file"/&gt;
        &lt;/restrict&gt;
        &lt;chainedmapper&gt;
          &lt;flattenmapper/&gt;
          &lt;globmapper from="*" to="WEB-INF/lib/*"/&gt;
        &lt;/chainedmapper&gt;
      &lt;/mappedresources&gt;
    &lt;/war&gt;
  </pre>

<h4 id="archives">archives</h4>

<p><em>Since Ant 1.8.0</em></p>

<p>This resource collection accepts an arbitrary number of nested
  resources and assumes that all those resources must be either ZIP or
  TAR archives.  The resources returned
  by <code>&lt;archives&gt;</code> are the contents of the nested
  archives.</p>

<p>This resource collection is a generalization
  of <a href="../Tasks/zip.html#zipgroupfileset">zipgroupfileset</a>
  which is only supported by the zip family of tasks.</p>

<p><em>archives</em> doesn't support any attributes.</p>

  <h5>Parameters specified as nested elements</h5>

  <p><code>&lt;archives&gt;</code> has two nested
    elements <code>&lt;zips&gt;</code> and
    <code>&lt;tars&gt;</code> that are <a href="#union">unions</a>
    themselves, i.e. they accept arbitrary many resource(collection)s
    as nested elements.</p>

  <p>The nested resources of &lt;zips&gt; are treated as ZIP archives,
    the nested resources of &lt;tars&gt; as TAR archives.</p>

  <h5>Examples</h5>

  <p>Copies all files from all jars that are on the classpath
    to <code>${target}</code>.</p>

  <pre>
    &lt;copy todir="${target}"&gt;
      &lt;archives&gt;
        &lt;zips&gt;
          &lt;restrict&gt;
            &lt;path path="${java.class.path}"/&gt;
            &lt;name name="*.jar"/&gt;
          &lt;/restrict&gt;
        &lt;/zips&gt;
      &lt;/archives&gt;
    &lt;/copy&gt;
  </pre>

<h4 id="resourcelist">resourcelist</h4>

<p><em>Since Ant 1.8.0</em></p>

<p>This resource collection accepts an arbitrary number of nested
  resources, reads those resources and returns a resource for each
  line read.</p>

<p>If the line contains a colon, Ant will try to use it as an URL and
  if that fails (or the line doesn't contain a colon) will return a
  file resource with the line's content as its name.</p>

<p>Properties will be expanded for each line.  If the property
  expansion yields a resource object rather than a string (for example
  because of custom property helpers), the resources will be returned
  directly.</p>

<p><code>&lt;resourcelist&gt;</code> is a generalization
  of <a href="filelist.html"><code>&lt;filelist&gt;</code></a>.</p>

  <table>
    <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">encoding</td>
      <td valign="top">The encoding of the nested resources</td>
      <td valign="top" align="center">No, default is platform default</td>
    </tr>
  </table>

  <h5>Parameters specified as nested elements</h5>

  <p><code>&lt;resourcelist&gt;</code> accepts arbitrary many
    resource(collection)s as nested elements.</p>

  <p>In addition <code>&lt;resourcelist&gt;</code> supports
    nested <code>&lt;filterchain&gt;</code> elements that can be used
    to filter/modify the read resources before their lines get
    expanded.  Such a nested element corresponds to
    a <a href="filterchain.html">filterchain</a>.</p>

  <h5>Examples</h5>

  <p>The following example copies a file from the first URL of
    several alternatives that can actually be reached.  It assumes
    that the file mirrors.txt looks like</p>

  <pre>
    mirrors.txt:
http://best.mirror.example.org/
http://second.best.mirror.example.org/mirror/of/best/
https://yet.another.mirror/
http://the.original.site/
  </pre>

  <pre>
    &lt;copy todir="${target}"&gt;
      &lt;first&gt;
        &lt;restrict&gt;
          &lt;resourcelist&gt;
            &lt;file file="mirrors.txt"/&gt;
          &lt;/resourcelist&gt;
          &lt;exists/&gt;
        &lt;/restrict&gt;
      &lt;/first&gt;
    &lt;/copy&gt;
  </pre>

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