Coverage report

| %line | %branch
--- | --- | ---
org.apache.commons.jexl.parser.ASTReference |
79% |
88% |

1 |  |
     /*
2 |  |
      * Copyright 2002-2006 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
14 |  |
      * limitations under the License.
15 |  |
      */
16 |  |
     package org.apache.commons.jexl.parser;
17 |  |
18 |  |
     import org.apache.commons.jexl.JexlContext;
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20 |  |
     /**
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      * reference - any variable expression.
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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: ASTReference.java 398272 2006-04-30 03:14:01Z dion $
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      */
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     public class ASTReference extends SimpleNode {
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         /** first variable in the expression. */
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         protected SimpleNode root;
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30 |  |
         /**
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          * Create the node given an id.
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          *
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          * @param id node id.
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          */
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         public ASTReference(int id) {
36 | 0 |
             super(id);
37 | 0 |
         }
38 |  |
39 |  |
         /**
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          * Create a node with the given parser and id.
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          *
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          * @param p a parser.
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          * @param id node id.
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          */
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         public ASTReference(Parser p, int id) {
46 | 354 |
             super(p, id);
47 | 354 |
         }
48 |  |
49 |  |
         /** {@inheritDoc} */
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         public Object jjtAccept(ParserVisitor visitor, Object data) {
51 | 0 |
             return visitor.visit(this, data);
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         }
53 |  |
54 |  |
         /** {@inheritDoc} */
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         public Object value(JexlContext jc) throws Exception {
56 | 448 |
             return execute(null, jc);
57 |  |
         }
58 |  |
59 |  |
         /** Store the first child as {@link ASTReference#root root}. */
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         public void jjtClose() {
61 | 353 |
             root = (SimpleNode) jjtGetChild(0);
62 | 353 |
         }
63 |  |
64 |  |
         /**
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          * evaluate each piece of the reference.
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          *
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          * e.g. foo.bar.woogie[2].name, foo is our 'root', and we need to
68 |  |
          * evaluate 'bar.woogie[2].name' relative to foo.
69 |  |
          *
70 |  |
          * @param jc the {@link JexlContext} to evaluate against.
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          * @param obj not used. root.value(jc) is used instead.
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          * @return the value of the array expression.
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          * @throws Exception on any error
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          */
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         public Object execute(Object obj, JexlContext jc) throws Exception {
76 | 448 |
             Object o = root.value(jc);
77 |  |
78 |  |
             /*
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              * ignore the first child - it's our identifier
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              */
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             for (int i = 1; i < jjtGetNumChildren(); i++) {
82 | 86 |
                 o = ((SimpleNode) jjtGetChild(i)).execute(o, jc);
83 |  |
84 |  |
                 // check for a variable in the context named
85 |  |
                 // child0.child1.child2 etc
86 | 85 |
                 if (o == null) {
87 | 20 |
                     String varName = getIdentifierToDepth(i);
88 | 20 |
                     o = jc.getVars().get(varName);
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                 }
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             }
91 |  |
92 | 447 |
             return o;
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         }
94 |  |
95 |  |
         /**
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          * This method returns a variable from this identifier and it's children.
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          * For an expression like 'a.b.c', a is child zero, b is child 1 and c is
98 |  |
          * child 2.
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          *
100 |  |
          * @param i the depth of the child nodes to go to
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          * @return the a dotted variable from this identifier and it's child nodes.
102 |  |
          */
103 |  |
         private String getIdentifierToDepth(int i) {
104 | 20 |
             StringBuffer varName = new StringBuffer();
105 | 68 |
             for (int j = 0; j <= i; j++) {
106 | 48 |
                 SimpleNode node = (SimpleNode) jjtGetChild(j);
107 | 48 |
                 if (node instanceof ASTIdentclass="keyword">ifier) {
108 | 44 |
                     varName.append(((ASTIdentifier) node).getIdentifierString());
109 | 44 |
                     if (j != i) {
110 | 28 |
                         varName.append('.');
111 |  |
                     }
112 |  |
                 }
113 |  |
             }
114 | 20 |
             return varName.toString();
115 |  |
         }
116 |  |
117 |  |
         /**
118 |  |
          * Gets the variable name of {@link ASTReference#root root}.
119 |  |
          * @return the identifier.
120 |  |
          * @throws Exception on any error
121 |  |
          * @see ASTIdentifier#getIdentifierString()
122 |  |
          * @see ASTArrayAccess#getIdentifierString()
123 |  |
          */
124 |  |
         public String getRootString() throws Exception {
125 | 107 |
             if (root instanceof ASTIdentclass="keyword">ifier) {
126 | 107 |
                 return ((ASTIdentifier) root).getIdentifierString();
127 |  |
             }
128 |  |
129 | 0 |
             if (root instanceof ASTArrayAccess) {
130 | 0 |
                 return ((ASTArrayAccess) root).getIdentifierString();
131 |  |
             }
132 |  |
133 | 0 |
             throw new Exception("programmer error : ASTReference : root not known" + root);
134 |  |
         }
135 |  |
     }

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