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| org.apache.commons.jexl.junit.Asserter | 
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| 1 |  /* | |
| 2 |   * Copyright 2003-2006 The Apache Software Foundation. | |
| 3 |   * | |
| 4 |   * Licensed under the Apache License, Version 2.0 (the "License"); | |
| 5 |   * you may not use this file except in compliance with the License. | |
| 6 |   * You may obtain a copy of the License at | |
| 7 |   * | |
| 8 |   *      http://www.apache.org/licenses/LICENSE-2.0 | |
| 9 |   * | |
| 10 |   * Unless required by applicable law or agreed to in writing, software | |
| 11 |   * distributed under the License is distributed on an "AS IS" BASIS, | |
| 12 |   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| 13 |   * See the License for the specific language governing permissions and | |
| 14 |   * limitations under the License. | |
| 15 |   */ | |
| 16 | ||
| 17 |  package org.apache.commons.jexl.junit; | |
| 18 | ||
| 19 |  import java.util.HashMap; | |
| 20 |  import java.util.Map; | |
| 21 | ||
| 22 |  import junit.framework.Assert; | |
| 23 | ||
| 24 |  import org.apache.commons.jexl.Expression; | |
| 25 |  import org.apache.commons.jexl.ExpressionFactory; | |
| 26 |  import org.apache.commons.jexl.JexlContext; | |
| 27 |  import org.apache.commons.jexl.JexlHelper; | |
| 28 | ||
| 29 |  /** | |
| 30 |   * A utility class for performing JUnit based assertions using Jexl | |
| 31 |   * expressions. This class can make it easier to do unit tests using | |
| 32 |   * Jexl navigation expressions. | |
| 33 |   * | |
| 34 |   * @since 1.0 | |
| 35 |   * @author <a href="mailto:jstrachan@apache.org">James Strachan</a> | |
| 36 |   * @version $Revision: 398153 $ | |
| 37 |   */ | |
| 38 | public class Asserter extends Assert { | |
| 39 | ||
| 40 |      /** variables used during asserts. */ | |
| 41 | 2 | private final Map variables = new HashMap(); | 
| 42 |      /** context to use during asserts. */ | |
| 43 | 2 | private final JexlContext context = JexlHelper.createContext(); | 
| 44 | ||
| 45 |      /** | |
| 46 |       *  | |
| 47 |       * Create an asserter. | |
| 48 |       */ | |
| 49 | 1 |      public Asserter() { | 
| 50 | ||
| 51 | 1 | } | 
| 52 | ||
| 53 |      /** | |
| 54 |       * This constructor will register the given variableValue as the | |
| 55 |       * "this" variable. | |
| 56 |       *  | |
| 57 |       * @param variableValue 'this'. | |
| 58 |       */ | |
| 59 | 1 |      public Asserter(Object variableValue) { | 
| 60 | 1 |          setVariable("this", variableValue); | 
| 61 | 1 | } | 
| 62 | ||
| 63 |      /** | |
| 64 |       * Performs an assertion that the value of the given Jexl expression  | |
| 65 |       * evaluates to the given expected value. | |
| 66 |       *  | |
| 67 |       * @param expression is the Jexl expression to evaluate | |
| 68 |       * @param expected is the expected value of the expression | |
| 69 |       * @throws Exception if the expression could not be evaluationed or an assertion | |
| 70 |       * fails | |
| 71 |       */ | |
| 72 | public void assertExpression(String expression, Object expected) throws Exception { | |
| 73 | 7 | Expression exp = ExpressionFactory.createExpression(expression); | 
| 74 | ||
| 75 | 7 | context.setVars(variables); | 
| 76 | 7 | Object value = exp.evaluate(context); | 
| 77 | ||
| 78 | 7 |          assertEquals("expression: " + expression, expected, value); | 
| 79 | 5 | } | 
| 80 | ||
| 81 |      /** | |
| 82 |       * Puts a variable of a certain name in the context so that it can be used from | |
| 83 |       * assertion expressions. | |
| 84 |       *  | |
| 85 |       * @param name variable name | |
| 86 |       * @param value variable value | |
| 87 |       */ | |
| 88 | public void setVariable(String name, Object value) { | |
| 89 | 3 | variables.put(name, value); | 
| 90 | 3 | } | 
| 91 | ||
| 92 | } | 
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