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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>Echoproperties Task</title>
</head>
<body>
<h2><a name="echoproperties">echoproperties</a></h2>
<h3>Description</h3>
<p>Displays all the current properties (or a subset of them specified
by a nested <code><propertyset></code>) in the project. The
output can be sent to a file if desired. This task can be used as a
somewhat contrived means of returning data from an
<tt><ant></tt> invocation, but is really for debugging build
files.</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">destfile</td>
<td valign="top">If specified, the value indicates the name of the
file to send the output of the statement to. The generated output file
is compatible for loading by any Java application as a property file.
If not specified, then the output will go to the Apache Ant log.</td>
<td valign="top" align="center">No</td>
</tr>
<tr>
<td valign="top">prefix</td>
<td valign="top">
a prefix which is used to filter the properties
only those properties starting with this prefix will be echoed.
<P>
</td>
<td valign="top" align="center">No</td>
</tr>
<tr>
<td valign="top">regex</td>
<td valign="top">
a regular expression which is used to filter the
properties
only those properties whose names match it will be echoed.
</td>
<td valign="top" align="center">No</td>
</tr>
<tr>
<td valign="top">failonerror</td>
<td valign="top">By default, the "failonerror" attribute is enabled.
If an error occurs while writing the properties to a file, and this
attribute is enabled, then a BuildException will be thrown, causing the
build to fail. If disabled, then IO errors will be reported as a log
statement, and the build will continue without failure from this task.</td>
<td valign="top" align="center">No</td>
</tr>
<tr>
<td valign="top">format</td>
<td valign="top">One of <code>text</code> or <code>xml</code>.
Determines the output format. Defaults to <code>text</code>.</td>
<td valign="top" align="center">No</td>
</tr>
</table>
<h3>Parameters specified as nested elements</h3>
<h4>propertyset</h4>
<p>You can specify subsets of properties to be echoed with <a
href="../Types/propertyset.html">propertyset</a>s. Using
<tt>propertyset</tt>s gives more control on which properties will be
picked up. The attributes <tt>prefix</tt> and <tt>regex</tt> are just
shortcuts that use <tt>propertyset</tt>s internally.
</p>
<p><em>since Ant 1.6</em>.</p>
<h3>Examples</h3>
<blockquote><pre>
<echoproperties/>
</pre></blockquote>
<p>Report the current properties to the log.</p>
<blockquote><pre>
<echoproperties destfile="my.properties"/>
</pre></blockquote>
<p>Report the current properties to the file "my.properties", and will
fail the build if the file could not be created or written to.</p>
<blockquote><pre>
<echoproperties destfile="my.properties" failonerror="false"/>
</pre></blockquote>
<p>Report the current properties to the file "my.properties", and will
log a message if the file could not be created or written to, but will still
allow the build to continue.</p>
<blockquote><pre>
<echoproperties prefix="java."/>
</pre></blockquote>
<p>List all properties beginning with "java."</p>
<blockquote><pre>
<echoproperties>
<propertyset>
<propertyref prefix="java."/>
</propertyset>
</echoproperties>
</pre></blockquote>
<p>This again lists all properties beginning with "java." using a nested
<tt></propertyset></tt> which is an equivalent but longer way.</p>
<blockquote><pre>
<echoproperties regex=".*ant.*"/>
</pre></blockquote>
<p>Lists all properties that contain "ant" in their names.
The equivalent snippet with <tt></propertyset></tt> is:</p>
<blockquote><pre>
<echoproperties>
<propertyset>
<propertyref regex=".*ant.*"/>
</propertyset>
</echoproperties>
</pre></blockquote>
</body>
</html>
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