dion 2004/08/22 19:55:07
Modified: jexl/xdocs/reference examples.xml
Log:
Add simple example
Revision Changes Path
1.4 +19 -0 jakarta-commons/jexl/xdocs/reference/examples.xml
Index: examples.xml
===================================================================
RCS file: /home/cvs/jakarta-commons/jexl/xdocs/reference/examples.xml,v
retrieving revision 1.3
retrieving revision 1.4
diff -u -r1.3 -r1.4
--- examples.xml 23 Aug 2004 01:12:34 -0000 1.3
+++ examples.xml 23 Aug 2004 02:55:07 -0000 1.4
@@ -54,6 +54,25 @@
<a
href="http://jakarta.apache.org/commons/jexl/apidocs/org/apache/commons/jexl/Expression.html#evaluate(org.apache.commons.jexl.JexlContext)">evaluate</a>
to execute it and obtain a result.
</p>
+ <p>
+ Here's a typical scenario:
+ </p>
+ <source>
+ // Create an expression object for our calculation
+ String calculateTax = taxManager.getTaxCalc(); //e.g. "((G1 + G2 + G3) * 0.1) +
G4";
+ Expression e = ExpressionFactory.createExpression( calculateTax );
+
+ // populate the context
+ JexlContext context = JexlHelper.createContext();
+ context.getVars().put("G1", businessObject.getTotalSales());
+ context.getVars().put("G2", taxManager.getTaxCredit(businessObject.getYear()));
+ context.getVars().put("G3", businessObject.getIntercompanyPayments());
+ context.getVars().put("G4", -taxManager.getAllowances());
+ // ...
+
+ // work it out
+ Float result = (Float)e.evaluate(context);
+ </source>
</section>
<section name="Custom Contexts">
</section>
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