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org.apache.commons.jexl.resolver.FlatResolver	100%	100%

1		package org.apache.commons.jexl.resolver;
2
3		import org.apache.commons.jexl.JexlExprResolver;
4		import org.apache.commons.jexl.JexlContext;
5
6		/**
7		* Simple resolver to try the expression as-is from the context.
8		*
9		* For example, you could resolve ant-ish properties (foo.bar.woogie)
10		* using this...
11		*
12		* hint, hint...
13		*
14		* @author <a href="mailto:geirm@adeptra.com">Geir Magnusson Jr.</a>
15		* @version $Id: FlatResolver.java,v 1.1 2002/06/13 16:10:44 geirm Exp $
16		*/
17		public class FlatResolver implements JexlExprResolver
18		{
19		/**
20		* flag to return NO_VALUE on null from context
21		* this allows jexl to try to evaluate
22		*/
23	54	protected boolean noValOnNull = true;
24
25		/**
26		* default CTOR
27		*/
28	2	public FlatResolver()
29	37	{
30	39	}
31
32		/**
33		* CTOR that lets you override the default behavior of
34		* noValOnNull, which is true (jexl gets a shot after if null)
35		*/
36	1	public FlatResolver(boolean noValOnNull)
37	14	{
38	15	this.noValOnNull = noValOnNull;
39	15	}
40
41		public Object evaluate(JexlContext context, String expression)
42		{
43	54	Object val = context.getVars().get(expression);
44
45	54	if (val == null && noValOnNull)
46		{
47	15	return JexlExprResolver.NO_VALUE;
48		}
49
50	39	return val;
51		}
52		}

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