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| org.apache.commons.jexl.parser.ASTReference |
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| 1 | /* |
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| 2 | * Copyright 2002-2006 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 |
|
| 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 |
|
| 14 | * limitations under the License. |
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| 15 | */ |
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| 16 | package org.apache.commons.jexl.parser; |
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| 17 | ||
| 18 | import org.apache.commons.jexl.JexlContext; |
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| 19 | ||
| 20 | /** |
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| 21 | * reference - any variable expression. |
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| 22 | * |
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| 23 | * @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a> |
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| 24 | * @version $Id: ASTReference.java 398272 2006-04-30 03:14:01Z dion $ |
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| 25 | */ |
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| 26 | public class ASTReference extends SimpleNode { |
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| 27 | /** first variable in the expression. */ |
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| 28 | protected SimpleNode root; |
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| 29 | ||
| 30 | /** |
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| 31 | * Create the node given an id. |
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| 32 | * |
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| 33 | * @param id node id. |
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| 34 | */ |
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| 35 | public ASTReference(int id) { |
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| 36 | 0 | super(id); |
| 37 | 0 | } |
| 38 | ||
| 39 | /** |
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| 40 | * Create a node with the given parser and id. |
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| 41 | * |
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| 42 | * @param p a parser. |
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| 43 | * @param id node id. |
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| 44 | */ |
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| 45 | public ASTReference(Parser p, int id) { |
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| 46 | 354 | super(p, id); |
| 47 | 354 | } |
| 48 | ||
| 49 | /** {@inheritDoc} */ |
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| 50 | public Object jjtAccept(ParserVisitor visitor, Object data) { |
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| 51 | 0 | return visitor.visit(this, data); |
| 52 | } |
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| 53 | ||
| 54 | /** {@inheritDoc} */ |
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| 55 | public Object value(JexlContext jc) throws Exception { |
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| 56 | 448 | return execute(null, jc); |
| 57 | } |
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| 58 | ||
| 59 | /** Store the first child as {@link ASTReference#root root}. */ |
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| 60 | public void jjtClose() { |
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| 61 | 353 | root = (SimpleNode) jjtGetChild(0); |
| 62 | 353 | } |
| 63 | ||
| 64 | /** |
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| 65 | * evaluate each piece of the reference. |
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| 66 | * |
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| 67 | * e.g. foo.bar.woogie[2].name, foo is our 'root', and we need to |
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| 68 | * evaluate 'bar.woogie[2].name' relative to foo. |
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| 69 | * |
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| 70 | * @param jc the {@link JexlContext} to evaluate against. |
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| 71 | * @param obj not used. root.value(jc) is used instead. |
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| 72 | * @return the value of the array expression. |
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| 73 | * @throws Exception on any error |
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| 74 | */ |
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| 75 | public Object execute(Object obj, JexlContext jc) throws Exception { |
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| 76 | 448 | Object o = root.value(jc); |
| 77 | ||
| 78 | /* |
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| 79 | * ignore the first child - it's our identifier |
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| 80 | */ |
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| 81 | 533 | 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 |
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| 85 | // child0.child1.child2 etc |
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| 86 | 85 | if (o == null) { |
| 87 | 20 | String varName = getIdentifierToDepth(i); |
| 88 | 20 | o = jc.getVars().get(varName); |
| 89 | } |
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| 90 | } |
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| 91 | ||
| 92 | 447 | return o; |
| 93 | } |
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| 94 | ||
| 95 | /** |
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| 96 | * This method returns a variable from this identifier and it's children. |
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| 97 | * For an expression like 'a.b.c', a is child zero, b is child 1 and c is |
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| 98 | * child 2. |
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| 99 | * |
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| 100 | * @param i the depth of the child nodes to go to |
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| 101 | * @return the a dotted variable from this identifier and it's child nodes. |
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| 102 | */ |
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| 103 | private String getIdentifierToDepth(int i) { |
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| 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 | } |
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| 112 | } |
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| 113 | } |
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| 114 | 20 | return varName.toString(); |
| 115 | } |
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| 116 | ||
| 117 | /** |
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| 118 | * Gets the variable name of {@link ASTReference#root root}. |
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| 119 | * @return the identifier. |
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| 120 | * @throws Exception on any error |
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| 121 | * @see ASTIdentifier#getIdentifierString() |
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| 122 | * @see ASTArrayAccess#getIdentifierString() |
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| 123 | */ |
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| 124 | public String getRootString() throws Exception { |
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| 125 | 107 | if (root instanceof ASTIdentclass="keyword">ifier) { |
| 126 | 107 | return ((ASTIdentifier) root).getIdentifierString(); |
| 127 | } |
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| 128 | ||
| 129 | 0 | if (root instanceof ASTArrayAccess) { |
| 130 | 0 | return ((ASTArrayAccess) root).getIdentifierString(); |
| 131 | } |
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| 132 | ||
| 133 | 0 | throw new Exception("programmer error : ASTReference : root not known" + root); |
| 134 | } |
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| 135 | } |
| This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |