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ReflectionValueExtractor (plexus-utils API)
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org.codehaus.plexus.util.introspection</FONT>
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Class ReflectionValueExtractor</H2>
<PRE>
java.lang.Object
<IMG SRC="../../../../../resources/inherit.gif" ALT="extended by "><B>org.codehaus.plexus.util.introspection.ReflectionValueExtractor</B>
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<DL>
<DT><PRE>public class <B>ReflectionValueExtractor</B><DT>extends java.lang.Object</DL>
</PRE>
<P>
<p>Using simple dotted expressions to extract the values from an Object instance,
For example we might want to extract a value like: <code>project.build.sourceDirectory</code></p>
<p>The implementation supports indexed, nested and mapped properties similar to the JSP way.</p>
<P>
<P>
<DL>
<DT><B>Version:</B></DT>
<DD>$Id: ReflectionValueExtractor.java 8010 2009-01-07 12:59:50Z vsiveton $</DD>
<DT><B>Author:</B></DT>
<DD><a href="mailto:jason@maven.org">Jason van Zyl </a>, <a href="mailto:vincent.siveton@gmail.com">Vincent Siveton</a></DD>
<DT><B>See Also:</B><DD><a href="http://struts.apache.org/1.x/struts-taglib/indexedprops.html">http://struts.apache.org/1.x/struts-taglib/indexedprops.html</a></DL>
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<CODE>static java.lang.Object</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/codehaus/plexus/util/introspection/ReflectionValueExtractor.html#evaluate(java.lang.String, java.lang.Object)">evaluate</A></B>(java.lang.String expression,
java.lang.Object root)</CODE>
<BR>
The implementation supports indexed, nested and mapped properties.</TD>
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<CODE>static java.lang.Object</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/codehaus/plexus/util/introspection/ReflectionValueExtractor.html#evaluate(java.lang.String, java.lang.Object, boolean)">evaluate</A></B>(java.lang.String expression,
java.lang.Object root,
boolean trimRootToken)</CODE>
<BR>
The implementation supports indexed, nested and mapped properties.</TD>
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<TH ALIGN="left"><B>Methods inherited from class java.lang.Object</B></TH>
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<TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD>
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<A NAME="evaluate(java.lang.String, java.lang.Object)"><!-- --></A><H3>
evaluate</H3>
<PRE>
public static java.lang.Object <B>evaluate</B>(java.lang.String expression,
java.lang.Object root)
throws java.lang.Exception</PRE>
<DL>
<DD><p>The implementation supports indexed, nested and mapped properties.</p>
<ul>
<li>nested properties should be defined by a dot, i.e. "user.address.street"</li>
<li>indexed properties (java.util.List or array instance) should be contains <code>(\\w+)\\[(\\d+)\\]</code>
pattern, i.e. "user.addresses[1].street"</li>
<li>mapped properties should be contains <code>(\\w+)\\((.+)\\)</code> pattern, i.e. "user.addresses(myAddress).street"</li>
<ul>
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>expression</CODE> - not null expression<DD><CODE>root</CODE> - not null object
<DT><B>Returns:</B><DD>the object defined by the expression
<DT><B>Throws:</B>
<DD><CODE>java.lang.Exception</CODE> - if any</DL>
</DD>
</DL>
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<A NAME="evaluate(java.lang.String, java.lang.Object, boolean)"><!-- --></A><H3>
evaluate</H3>
<PRE>
public static java.lang.Object <B>evaluate</B>(java.lang.String expression,
java.lang.Object root,
boolean trimRootToken)
throws java.lang.Exception</PRE>
<DL>
<DD><p>The implementation supports indexed, nested and mapped properties.</p>
<ul>
<li>nested properties should be defined by a dot, i.e. "user.address.street"</li>
<li>indexed properties (java.util.List or array instance) should be contains <code>(\\w+)\\[(\\d+)\\]</code>
pattern, i.e. "user.addresses[1].street"</li>
<li>mapped properties should be contains <code>(\\w+)\\((.+)\\)</code> pattern, i.e. "user.addresses(myAddress).street"</li>
<ul>
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>expression</CODE> - not null expression<DD><CODE>root</CODE> - not null object
<DT><B>Returns:</B><DD>the object defined by the expression
<DT><B>Throws:</B>
<DD><CODE>java.lang.Exception</CODE> - if any</DL>
</DD>
</DL>
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