Coverage report

| %line | %branch
--- | --- | ---
org.apache.commons.jexl.ExpressionImpl |
100% |
100% |

1 |  |
     /*
2 |  |
      * Copyright 2002,2004 The Apache Software Foundation.
3 |  |
      *
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      * Licensed under the Apache License, Version 2.0 (the "License");
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      * you may not use this file except in compliance with the License.
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      * You may obtain a copy of the License at
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      *
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      *      http://www.apache.org/licenses/LICENSE-2.0
9 |  |
      *
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      * Unless required by applicable law or agreed to in writing, software
11 |  |
      * distributed under the License is distributed on an "AS IS" BASIS,
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      * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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      * See the License for the specific language governing permissions and
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      * limitations under the License.
15 |  |
      */
16 |  |
17 |  |
     package org.apache.commons.jexl;
18 |  |
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     import java.util.ArrayList;
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     import java.util.List;
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22 |  |
     import org.apache.commons.jexl.parser.SimpleNode;
23 |  |
24 |  |
     /**
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      * Instances of ExpressionImpl are created by the {@link ExpressionFactory},
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      * and this is the default implementation of the {@link Expression} interface.
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      *
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      *  @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a>
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      *  @version $Id: ExpressionImpl.java,v 1.11 2004/08/23 14:00:11 dion Exp $
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      */
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     class ExpressionImpl implements Expression
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     {
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         protected List preResolvers;
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         protected List postResolvers;
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         /**
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          *  Original expression - this is just a 'snippet', not a valid
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          *  statement (i.e.  foo.bar() vs foo.bar();
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          */
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         protected String expression;
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43 |  |
         /**
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          *  The resulting AST we can call value() on
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          */
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         protected SimpleNode node;
47 |  |
48 |  |
         /**
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          *  do not let this be generally instantiated with a 'new'
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          */
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         ExpressionImpl(String expr, SimpleNode ref)
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         {
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             expression = expr;
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             node = ref;
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         }
56 |  |
57 |  |
         /**
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          *  Evaluate the expression and return the value.
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          *
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          * Before JEXL evaluates the expression, any pre-resolvers will be called.
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          * If the pre-resolver provides a value, it is returned.
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          * If JEXL evaluates the expression as null, post-resolvers are called
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          * and any resulting value returned.
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          *
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          *  @param context Context containing objects/data used for evaluation
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          *  @return value of expression
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          */
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         public Object evaluate(JexlContext context)
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             throws Exception
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         {
71 | 2727 |
             Object val = null;
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73 |  |
             /*
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              * if we have pre resolvers, give them a wack
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              */
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             if (preResolvers != null)
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             {
78 | 45 |
                 val = tryResolver(preResolvers, context);
79 |  |
80 | 45 |
                 if (val != JexlExprResolver.NO_VALUE)
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                 {
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                     return val;
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                 }
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             }
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86 | 2697 |
             val = node.value(context);
87 |  |
88 |  |
             /*
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              * if null, call post resolvers
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              */
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             if (val == null && postResolvers != class="keyword">null)
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             {
93 | 9 |
                 val = tryResolver(postResolvers, context);
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95 | 9 |
                 if (val != JexlExprResolver.NO_VALUE)
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                 {
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                     return val;
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                 }
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             }
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101 | 2673 |
             return val;
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         }
103 |  |
104 |  |
         /**
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          *  Tries the resolvers in the given resolverlist against the context
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          *
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          *  @param resolverList list of JexlExprResolvers
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          *  @param context JexlContext to use for evauluation
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          *  @return value (including null) or JexlExprResolver.NO_VALUE
110 |  |
          */
111 |  |
         protected Object tryResolver(List resolverList, JexlContext context)
112 |  |
         {
113 | 54 |
             Object val = JexlExprResolver.NO_VALUE;
114 | 54 |
             String expr = getExpression();
115 |  |
116 | 69 |
             for (int i = 0; i < resolverList.size(); i++)
117 |  |
             {
118 | 54 |
                 JexlExprResolver jer = (JexlExprResolver) resolverList.get(i);
119 |  |
120 | 54 |
                 val = jer.evaluate(context, expr);
121 |  |
122 |  |
                 /*
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                 * as long as it's not NO_VALUE, return it
124 |  |
                 */
125 | 54 |
                 if (val != JexlExprResolver.NO_VALUE)
126 |  |
                 {
127 | 39 |
                    return val;
128 |  |
                 }
129 |  |
             }
130 |  |
131 | 15 |
             return val;
132 |  |
         }
133 |  |
134 |  |
         /**
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          *  returns original expression string
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          */
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         public String getExpression()
138 |  |
         {
139 | 54 |
             return expression;
140 |  |
         }
141 |  |
142 |  |
         public void addPreResolver(JexlExprResolver resolver)
143 |  |
         {
144 | 45 |
             if (preResolvers == null)
145 |  |
             {
146 | 45 |
                 preResolvers = new ArrayList();
147 |  |
             }
148 | 45 |
             preResolvers.add(resolver);
149 | 45 |
         }
150 |  |
151 |  |
         /**
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          *  allows addition of a resolver to allow custom interdiction of
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          *  expression evaluation
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          *
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          *  @param resolver resolver to be called if Jexl expression evaluated to null
156 |  |
          */
157 |  |
         public void addPostResolver(JexlExprResolver resolver)
158 |  |
         {
159 | 9 |
             if (postResolvers == null)
160 |  |
             {
161 | 9 |
                 postResolvers = new ArrayList();
162 |  |
             }
163 | 9 |
             postResolvers.add(resolver);
164 | 9 |
         }
165 |  |
166 |  |
     }

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