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org.apache.commons.jelly.expression.jexl.JexlExpressionFactory$ExpressionSupportLocal |
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1 | /* |
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2 | * Copyright 2002,2004 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 | ||
17 | package org.apache.commons.jelly.expression.jexl; |
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18 | ||
19 | import org.apache.commons.jelly.JellyContext; |
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20 | import org.apache.commons.jelly.JellyException; |
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21 | import org.apache.commons.jelly.expression.Expression; |
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22 | import org.apache.commons.jelly.expression.ExpressionSupport; |
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23 | import org.apache.commons.jelly.expression.ExpressionFactory; |
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24 | ||
25 | //import org.apache.commons.jexl.resolver.FlatResolver; |
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26 | ||
27 | /** |
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28 | * Represents a factory of <a href="http://jakarta.apache.org/commons/jexl.html">Jexl</a> |
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29 | * expression which fully supports the Expression Language in JSTL and JSP. |
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30 | * In addition this ExpressionFactory can also support Ant style variable |
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31 | * names, where '.' is used inside variable names. |
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32 | * |
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33 | * @author <a href="mailto:jstrachan@apache.org">James Strachan</a> |
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34 | * @version $Revision: 155420 $ |
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35 | */ |
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36 | ||
37 | public class JexlExpressionFactory implements ExpressionFactory { |
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38 | ||
39 | /** whether we should allow Ant-style expresssions, using dots as part of variable name */ |
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40 | private boolean supportAntVariables = true; |
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41 | ||
42 | // ExpressionFactory interface |
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43 | //------------------------------------------------------------------------- |
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44 | public Expression createExpression(String text) throws JellyException { |
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45 | /* |
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46 | ||
47 | org.apache.commons.jexl.Expression expr = |
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48 | org.apache.commons.jexl.ExpressionFactory.createExpression(text); |
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49 | ||
50 | if ( isSupportAntVariables() ) { |
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51 | expr.addPostResolver(new FlatResolver()); |
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52 | } |
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53 | ||
54 | return new JexlExpression( expr ); |
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55 | */ |
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56 | ||
57 | Expression jexlExpression = null; |
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58 | try { |
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59 | // this method really does throw Exception |
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60 | jexlExpression = new JexlExpression( |
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61 | org.apache.commons.jexl.ExpressionFactory.createExpression(text) |
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62 | ); |
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63 | } catch (Exception e) { |
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64 | throw new JellyException("Unable to create expression: " + text, e); |
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65 | } |
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66 | ||
67 | if ( isSupportAntVariables() && isValidAntVariableName(text) ) { |
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68 | return new ExpressionSupportLocal(jexlExpression,text); |
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69 | } |
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70 | return jexlExpression; |
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71 | } |
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72 | ||
73 | // Properties |
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74 | //------------------------------------------------------------------------- |
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75 | ||
76 | /** |
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77 | * @return whether we should allow Ant-style expresssions, using dots as |
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78 | * part of variable name |
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79 | */ |
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80 | public boolean isSupportAntVariables() { |
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81 | return supportAntVariables; |
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82 | } |
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83 | ||
84 | /** |
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85 | * Sets whether we should allow Ant-style expresssions, using dots as |
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86 | * part of variable name |
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87 | */ |
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88 | public void setSupportAntVariables(boolean supportAntVariables) { |
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89 | this.supportAntVariables = supportAntVariables; |
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90 | } |
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91 | ||
92 | // Implementation methods |
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93 | //------------------------------------------------------------------------- |
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94 | ||
95 | /** |
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96 | * @return true if the given string is a valid Ant variable name, |
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97 | * typically thats alphanumeric text with '.' etc. |
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98 | */ |
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99 | protected boolean isValidAntVariableName(String text) { |
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100 | char[] class="keyword">chars = text.toCharArray(); |
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101 | for (int i = 0, size = chars.length; i < size; i++ ) { |
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102 | char ch = class="keyword">chars[i]; |
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103 | // could maybe be a bit more restrictive... |
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104 | if ( Character.isWhitespace(ch) || ch == '[' || ch == ']' || ch == '(' || ch == ')') { |
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105 | return false; |
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106 | } |
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107 | } |
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108 | return true; |
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109 | } |
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110 | ||
111 | private class ExpressionSupportLocal extends ExpressionSupport { |
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112 | ||
113 | 7527 | protected Expression jexlExpression = null; |
114 | 7527 | protected String text = null; |
115 | ||
116 | 7527 | public ExpressionSupportLocal(Expression jexlExpression, String text) { |
117 | 7527 | this.jexlExpression = jexlExpression; |
118 | 7527 | this.text = text; |
119 | 7527 | } |
120 | ||
121 | public Object evaluate(JellyContext context) { |
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122 | 9087 | Object answer = jexlExpression.evaluate(context); |
123 | ||
124 | 9087 | if ( answer == null ) { |
125 | 2392 | answer = context.getVariable(text); |
126 | } |
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127 | ||
128 | 9087 | return answer; |
129 | } |
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130 | ||
131 | public String getExpressionText() { |
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132 | 364 | return "${" + text + "}"; |
133 | } |
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134 | ||
135 | public String toString() { |
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136 | 0 | return super.toString() + "[expression:" + text + "]"; |
137 | } |
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138 | } |
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139 | ||
140 | } |
This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |