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org.apache.commons.jexl.resolver.FlatResolver |
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1 | /* |
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2 | * Copyright 2002-2006 The Apache Software Foundation. |
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3 | * |
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4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
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5 | * you may not use this file except in compliance with the License. |
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6 | * You may obtain a copy of the License at |
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7 | * |
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8 | * http://www.apache.org/licenses/LICENSE-2.0 |
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9 | * |
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10 | * Unless required by applicable law or agreed to in writing, software |
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11 | * distributed under the License is distributed on an "AS IS" BASIS, |
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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13 | * See the License for the specific language governing permissions and |
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14 | * limitations under the License. |
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15 | */ |
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16 | package org.apache.commons.jexl.resolver; |
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17 | ||
18 | import org.apache.commons.jexl.JexlExprResolver; |
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19 | import org.apache.commons.jexl.JexlContext; |
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20 | ||
21 | /** |
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22 | * Simple resolver to try the expression as-is from the context. |
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23 | * |
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24 | * For example, you could resolve ant-ish properties (foo.bar.woogie) |
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25 | * using this... |
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26 | * |
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27 | * hint, hint... |
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28 | * |
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29 | * @since 1.0 |
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30 | * @author <a href="mailto:geirm@adeptra.com">Geir Magnusson Jr.</a> |
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31 | * @version $Id: FlatResolver.java 397542 2006-04-27 13:43:47Z dion $ |
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32 | */ |
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33 | public class FlatResolver implements JexlExprResolver { |
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34 | /** |
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35 | * Flag to return NO_VALUE on null from context. |
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36 | * this allows jexl to try to evaluate |
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37 | */ |
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38 | 4 | protected boolean noValOnNull = true; |
39 | ||
40 | /** |
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41 | * Default CTOR. |
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42 | */ |
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43 | 3 | public FlatResolver() { |
44 | 3 | } |
45 | ||
46 | /** |
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47 | * CTOR that lets you override the default behavior of |
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48 | * noValOnNull, which is true. (jexl gets a shot after if null) |
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49 | * |
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50 | * @param valOnNull Whether NO_VALUE will be returned instead of null. |
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51 | */ |
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52 | 1 | public FlatResolver(boolean valOnNull) { |
53 | 1 | noValOnNull = valOnNull; |
54 | 1 | } |
55 | ||
56 | /** |
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57 | * Try to resolve expression as-is. |
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58 | * |
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59 | * @param context The context for resolution. |
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60 | * @param expression The flat expression. |
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61 | * @return The resolved value. |
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62 | */ |
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63 | public Object evaluate(JexlContext context, String expression) { |
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64 | 3 | Object val = context.getVars().get(expression); |
65 | ||
66 | 3 | if (val == null && noValOnNull) { |
67 | 1 | return JexlExprResolver.NO_VALUE; |
68 | } |
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69 | ||
70 | 2 | return val; |
71 | } |
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72 | } |
This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |