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Java > Open Source Codes > org > apache > commons > jexl > parser > Node


1 /*
2  * Copyright 2002-2006 The Apache Software Foundation.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 /* Generated By:JJTree: Do not edit this line. Node.java */
17
18 package org.apache.commons.jexl.parser;
19
20 /**
21  * All AST nodes must implement this interface. It provides basic machinery for
22  * constructing the parent and child relationships between nodes.
23  */
24 public interface Node {
25
26     /**
27      * This method is called after the node has been made the current node. It
28      * indicates that child nodes can now be added to it.
29      */
30      void jjtOpen();
31
32     /**
33      * This method is called after all the child nodes have been added.
34      */
35      void jjtClose();
36
37     /**
38      * This pair of methods are used to inform the node of its parent.
39      * @param n the parent node.
40      */
41      void jjtSetParent(Node n);
42
43      /**
44       * Gets the parent node.
45       * @return the parent to this node.
46       */
47      Node jjtGetParent();
48
49     /**
50      * This method tells the node to add its argument to the node's list of
51      * children.
52      * @param n the child node to add
53      * @param i the index to add it at.
54      */
55      void jjtAddChild(Node n, int i);
56
57     /**
58      * This method returns a child node. The children are numbered from zero,
59      * left to right.
60      * @param i the index of the child to get.
61      * @return the child at the given index.
62      */
63      Node jjtGetChild(int i);
64
65     /**
66      * Gets the number of children the node has.
67      * @return the number of children the node has.
68      */
69      int jjtGetNumChildren();
70
71     /**
72      * Accept the visitor.
73      * @param data arbitrary data.
74      * @param visitor the visitor.
75      * @return the result of the visit.
76      */
77      Object JavaDoc jjtAccept(ParserVisitor visitor, Object JavaDoc data);
78 }
79
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