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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<!-- Generated by Apache Maven Doxia Site Renderer 1.3 at May 19, 2012 -->
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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<title>op4j: bending the Java spoon - OGNL Extension</title>
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<span id="publishDate">Last Published: 19 May 2012</span>
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<strong>· op4j-ognl</strong>
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<div class="section"><h2>OGNL Extension<a name="OGNL_Extension"></a></h2><p><a class="externalLink" href="http://www.opensymphony.com/ognl/">OGNL (Object-Graph Navigation Language</a> is an open-source expression language for getting and setting properties of Java objects.</p><p>It is famously used as an expression language in environments like the Apache Click, Spring Web Flow, WebWork and Tapestry web frameworks.</p><p>An example <i>getter method navigation</i> equivalent to <tt>getUser().getCompany().getName()</tt>:</p><div class="source"><pre>user.company.name
</pre></div><p>Which would be easy to use in op4j:</p><div class="source"><pre>String name =
Op.on(session).exec(FnOgnl.s("user.company.name")).get();
</pre></div><p>But OGNL can do much more than just navigating getters, like:</p><div class="source"><pre>name.toCharArray()[0].numericValue.toString()
</pre></div><p>See more examples at the <b>Language Guide</b> in the OGNL project page: <a class="externalLink" href="http://www.opensymphony.com/ognl/">http://www.opensymphony.com/ognl/</a></p><div class="section"><h3>Function classes<a name="Function_classes"></a></h3><p>The extension comprises only one <i>function hub class</i>:</p><ul><li><a href="./ognl-fnognl.html">FnOgnl</a></li></ul></div></div>
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