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1 2 3 4 | <html><head><META http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Extending OGNL</title><link href="../docbook.css" type="text/css" rel="stylesheet"><meta content="DocBook XSL Stylesheets V1.78.1" name="generator"><link rel="home" href="index.html" title="OGNL Developer Guide"><link rel="up" href="introduction.html" title="Chapter 1. Introduction"><link rel="prev" href="introduction.html" title="Chapter 1. Introduction"><link rel="next" href="propertyAccessors.html" title="Chapter 2. Property Accessors"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">Extending OGNL</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="introduction.html"><img src="../images/navigation/prev.gif" alt="Prev"></a> </td><th align="center" width="60%">Chapter 1. Introduction</th><td align="right" width="20%"> <a accesskey="n" href="propertyAccessors.html"><img src="../images/navigation/next.gif" alt="Next"></a></td></tr></table><hr></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="extendingOGNL"></a>Extending OGNL</h2></div></div></div><p>OGNL expressions are not evaluated in a static environment, as Java programs are. Expressions are not compiled to bytecode at the expression level based on static class reachability. The same expression can have multiple paths
through an object graph depending upon the root object specified and the dynamic results of the navigation. Objects that are delegated to handle all of the access to properties of objects, elements of collections, methods of objects,
resolution of class names to classes and converting between types are collectively known as <span class="emphasis"><em>OGNL extensions</em></span>. The following chapters delve more deeply into these extensions and provide a roadmap as to how they are used
within OGNL to customize the dynamic runtime environment to suit the needs of the embedding program.</p></div><div class="navfooter"><hr><table summary="Navigation footer" width="100%"><tr><td align="left" width="40%"><a accesskey="p" href="introduction.html"><img src="../images/navigation/prev.gif" alt="Prev"></a> </td><td align="center" width="20%"><a accesskey="u" href="introduction.html"><img src="../images/navigation/up.gif" alt="Up"></a></td><td align="right" width="40%"> <a accesskey="n" href="propertyAccessors.html"><img src="../images/navigation/next.gif" alt="Next"></a></td></tr><tr><td valign="top" align="left" width="40%">Chapter 1. Introduction </td><td align="center" width="20%"><a accesskey="h" href="index.html"><img src="../images/navigation/home.gif" alt="Home"></a></td><td valign="top" align="right" width="40%"> Chapter 2. Property Accessors</td></tr></table></div></body></html>
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