Package org.exolab.castor.jdo.oql

Class ParseTreeNode

  • public final class ParseTreeNode
extends java.lang.Object
    A Node in the Parse tree which is generated by the Parser as the tree representation of the OQL Query. Each node has a link back to the parent node (null for the root node), and a vector of children. Each node contains the Tokenwhich represents that part of the tree.
    Version:
    $Revision: 8102 $ $Date: 2006-04-25 15:08:23 -0600 (Tue, 25 Apr 2006) $
    Author:
    Nissim Karpenstein

    • Constructor Detail

      • ParseTreeNode

        public ParseTreeNode​(ParseTreeNode parent,
                     Token token)
        Creates a new Node with supplied parent and token.
        Parameters:
        parent - The parent of this node (null for root)
        token - The token data in this node

      • ParseTreeNode

        public ParseTreeNode​(Token token)
        Creates a new root Node with supplied token.
        Parameters:
        token - The token data in this node

    • Method Detail

      • toString

        public java.lang.String toString()
        Overrides:
        toString in class java.lang.Object

      • toStringEx

        public java.lang.String toStringEx()

      • setParent

        public void setParent​(ParseTreeNode parent)
        Changes the parent of this node.
        Parameters:
        parent - The new parent.

      • addChild

        public void addChild​(ParseTreeNode child)
        Adds a new node as a child of this node. Changes the nodes parent to this.
        Parameters:
        child - The new child

      • isRoot

        public boolean isRoot()
        Specifies whether this node is the root of a tree.
        Returns:
        True if the node does not have a parent, otherwise false.

      • isLeaf

        public boolean isLeaf()
        Specifies whether this node is a leaf.
        Returns:
        True if the node does not have any children, otherwise false.

      • getParent

        public ParseTreeNode getParent()
        Accessor method for the parent of this node.
        Returns:
        The parent of this node.

      • children

        public java.util.Iterator<ParseTreeNode> children()
        Accessor method for an iteration of this nodes children.
        Returns:
        An Iterator of children.

      • getChild

        public ParseTreeNode getChild​(int index)
        Accessor method for individual children of this node.
        Parameters:
        index - the index of the child to retrieve.
        Returns:
        the index child of this node.

      • getChildCount

        public int getChildCount()
        Accessor method for the number of children of this node.
        Returns:
        the number of children of this node.

      • getToken

        public Token getToken()
        Accessor method for the token.
        Returns:
        The token which is the datum of this node.