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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Ant-contrib Tasks: PropertySelector</title>
</head>
<body>
<h1>PropertySelector</h1>
<p>Selects property names that match a given regular expression and
returns them in a delimited list</p>
<h2>Parameters</h2>
<table border="1" cellpadding="2" cellspacing="0">
<tr>
<th>Attribute</th>
<th>Description</th>
<th>Required</th>
</tr>
<tr>
<td valign="top">property</td>
<td valign="top">The name of the property you wish to set.</td>
<td align="center" valign="top">Yes.</td>
</tr>
<tr>
<td valign="top">override</td>
<td valign="top">If the property is already set, should we change it's value.
Can be <code>true</code> or <code>false</code></td>
<td align="center" valign="top">No. Defaults to <code>false</code></td>
</tr>
<tr>
<td valign="top">match</td>
<td valign="top">The regular expression which is used to select
property names for inclusion in the list. This follows
the standard regular expression syntax accepted by ant's
regular expression tasks.</td>
<td align="center" valign="top">Yes.</td>
</tr>
<tr>
<td valign="top">select</td>
<td valign="top">A pattern which indicates what selection pattern you want
in the returned list. This used the substitution pattern
syntax to indicate where to insert groupings created as a result
of the regular expression match.</td>
<td align="center" valign="top">No. default is "\0".</td>
</tr>
<tr>
<td valign="top">casesensitive</td>
<td valign="top">Should the match be case sensitive</td>
<td align="center" valign="top">No. default is "true".</td>
</tr>
<tr>
<td valign="top">delimiter</td>
<td valign="top">The delimiter used to seperate entries in the resulting
property</td>
<td align="center" valign="top">No. default is ",".</td>
</tr>
<tr>
<td valign="top">distinct</td>
<td valign="top">Should the returned entries be a distinct set (no duplicate
entries)</td>
<td align="center" valign="top">No. default is "false".</td>
</tr>
</table>
<h2>Select expressions</h2>
Expressions are selected in a the same syntax as a regular expression
substitution pattern.
<ul type="o">
<li><code>\0</code> indicates the entire property name (default).
<li><code>\1</code> indicates the first grouping
<li><code>\2</code> indicates the second grouping
<li>etc...
</ul>
<h2>Example</h2>
The following code
<pre>
<code>
<property name="package.ABC.name" value="abc pack name" />
<property name="package.DEF.name" value="def pack name" />
<property name="package.GHI.name" value="ghi pack name" />
<property name="package.JKL.name" value="jkl pack name" />
<propertyselector property="pack.list"
delimiter=","
match="package\.([^\.]*)\.name"
select="\1"
casesensitive="false" />
</code>
</pre>
would yield the results
<pre>
<code>
ABC,DEF,GHI,JKL
</code>
</pre>
You could then iterate through this list using the <a href="foreach.html"
>ForEach Task</a> as follows:
<pre>
<code>
<foreach list="${pack.list}"
delimiter=","
target="print.name"
param="pack.id" />
<target name="print.name" >
<propertycopy name="pack.name" value="package.${pack.id}.name" />
<echo message="${pack.name}" />
</target>
</code>
</pre>
Would print
<pre>
<code>
[echo] abc pack name
[echo] def pack name
[echo] ghi pack name
[echo] jkl pack name
</code>
</pre>
<hr>
<p align="center">Copyright © 2003 Ant-Contrib Project. All
rights Reserved.</p>
</body>
</html>
|
