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PropertyHelper.PropertyEvaluator (Apache Ant API)
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org.apache.tools.ant
 
Interface PropertyHelper.PropertyEvaluator</H2>
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<DT>All Superinterfaces: <DD><A HREF="../../../../org/apache/tools/ant/PropertyHelper.Delegate.html" title="interface in org.apache.tools.ant">PropertyHelper.Delegate</A></DD>
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<DT>All Known Implementing Classes: <DD><A HREF="../../../../org/apache/tools/ant/property/LocalProperties.html" title="class in org.apache.tools.ant.property">LocalProperties</A></DD>
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<DT>Enclosing class:<DD><A HREF="../../../../org/apache/tools/ant/PropertyHelper.html" title="class in org.apache.tools.ant">PropertyHelper</A></DD>
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<DT><PRE>public static interface PropertyHelper.PropertyEvaluator<DT>extends <A HREF="../../../../org/apache/tools/ant/PropertyHelper.Delegate.html" title="interface in org.apache.tools.ant">PropertyHelper.Delegate</A></DL>
</PRE>

Looks up a property's value based on its name.

Can be used to look up properties in a different storage
 than the project instance (like local properties for example)
 or to implement custom "protocols" like Ant's
 <code>${toString:refid}</code> syntax.

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<DT>Since:</DT>
 <DD>Ant 1.8.0</DD>
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<CODE>&nbsp;java.lang.Object</CODE></TD>
<TD><CODE><A HREF="../../../../org/apache/tools/ant/PropertyHelper.PropertyEvaluator.html#evaluate(java.lang.String, org.apache.tools.ant.PropertyHelper)">evaluate</A>(java.lang.String&nbsp;property,
 <A HREF="../../../../org/apache/tools/ant/PropertyHelper.html" title="class in org.apache.tools.ant">PropertyHelper</A>&nbsp;propertyHelper)</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Evaluate a property.</TD>
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<A NAME="evaluate(java.lang.String, org.apache.tools.ant.PropertyHelper)"></A><H3>
evaluate</H3>
<PRE>
java.lang.Object evaluate(java.lang.String&nbsp;property,
 <A HREF="../../../../org/apache/tools/ant/PropertyHelper.html" title="class in org.apache.tools.ant">PropertyHelper</A>&nbsp;propertyHelper)</PRE>
<DL>
<DD>Evaluate a property.

<DD><DL>
</DL>
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<DD><DL>
<DT>Parameters:<DD><CODE>property</CODE> - the property's String "identifier".<DD><CODE>propertyHelper</CODE> - the invoking PropertyHelper.
<DT>Returns:<DD>null if the property name could not be found, an
 instance of <A HREF="../../../../org/apache/tools/ant/property/NullReturn.html" title="class in org.apache.tools.ant.property"><CODE>NullReturn</CODE></A> to indicate a property with a name that can be
 matched but a value of <code>null</code> and the property's
 value otherwise.</DL>
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