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