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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. |