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Java > Open Source Codes > org > apache > cayenne > ejbql > parser > Node


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19 package org.apache.cayenne.ejbql.parser;
20
21 import org.apache.cayenne.ejbql.EJBQLExpression;
22
23 /**
24  * A JJTree-compliant tree node interface.
25  *
26  * @since 3.0
27  * @author Andrus Adamchik
28  */
29 public interface Node extends EJBQLExpression {
30     /**
31      * This method is called after the node has been made the current node. It
32      * indicates that child nodes can now be added to it.
33      */
34     public void jjtOpen();
35
36     /**
37      * This method is called after all the child nodes have been added.
38      */
39     public void jjtClose();
40
41     /**
42      * This pair of methods are used to inform the node of its parent.
43      */
44     public void jjtSetParent(Node n);
45
46     public Node jjtGetParent();
47
48     /**
49      * This method tells the node to add its argument to the node's list of
50      * children.
51      */
52     public void jjtAddChild(Node n, int i);
53
54     /**
55      * This method returns a child node. The children are numbered from zero,
56      * left to right.
57      */
58     public Node jjtGetChild(int i);
59
60     /** Return the number of children the node has. */
61     public int jjtGetNumChildren();
62 }
63
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