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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 |
|
| 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. |