org.exolab.castor.jdo.oql

Class ParseTreeNode

Implemented Interfaces:
TokenTypes

public class ParseTreeNode
extends java.lang.Object
implements TokenTypes

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 Token which represents that part of the tree.
Version:
$Revision: 1.1.1.1 $ $Date: 2003/03/03 07:08:24 $
Author:
Nissim Karpenstein

Fields inherited from interface org.exolab.castor.jdo.oql.TokenTypes

ARROW, BOOLEAN_LITERAL, CHAR_LITERAL, COLON, COMMA, CONCAT, DATE_LITERAL, DIVIDE, DOLLAR, DOT, DOUBLE_LITERAL, END_OF_QUERY, EQUAL, GT, GTE, IDENTIFIER, KEYWORD_ABS, KEYWORD_AND, KEYWORD_AS, KEYWORD_ASC, KEYWORD_AVG, KEYWORD_BETWEEN, KEYWORD_BY, KEYWORD_COUNT, KEYWORD_DESC, KEYWORD_DISTINCT, KEYWORD_FROM, KEYWORD_IN, KEYWORD_IS_DEFINED, KEYWORD_IS_UNDEFINED, KEYWORD_LIKE, KEYWORD_LIMIT, KEYWORD_LIST, KEYWORD_MAX, KEYWORD_MIN, KEYWORD_MOD, KEYWORD_NIL, KEYWORD_NOT, KEYWORD_OR, KEYWORD_ORDER, KEYWORD_SELECT, KEYWORD_SUM, KEYWORD_UNDEFINED, KEYWORD_WHERE, LONG_LITERAL, LPAREN, LT, LTE, MINUS, NOT_EQUAL, PLUS, RPAREN, STRING_LITERAL, TIMES, TIMESTAMP_LITERAL, TIME_LITERAL

Constructor Summary

ParseTreeNode(ParseTreeNode parent, Token token)
Creates a new Node with supplied parent and token.
ParseTreeNode(Token token)
Creates a new root Node with supplied token.

Method Summary

void
addChild(ParseTreeNode child)
Adds a new node as a child of this node.
Enumeration
children()
Accessor method for an enumeration of this nodes children.
ParseTreeNode
getChild(int index)
Accessor method for individual children of this node.
int
getChildCount()
Accessor method for the number of children of this node.
ParseTreeNode
getParent()
Accessor method for the parent of this node.
Token
getToken()
Accessor method for the token.
boolean
isLeaf()
Specifies whether this node is a leaf.
boolean
isRoot()
Specifies whether this node is the root of a tree.
void
setParent(ParseTreeNode parent)
Changes the parent of this node.
String
toString()
String
toStringEx()

Constructor Details

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 Details

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

children

public Enumeration children()
Accessor method for an enumeration of this nodes children.
Returns:
An Enumeration 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.

getParent

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

getToken

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

isLeaf

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

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.

setParent

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

toString

public String toString()

toStringEx

public String toStringEx()

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