org.exolab.castor.jdo.oql

Class Lexer

java.lang.Object

org.exolab.castor.jdo.oql.Lexer

public final class Lexer
extends Object

Seperates an input string of OQL into a stream of Tokens.

Version:

$Revision: 7950 $ $Date: 2006-04-25 15:08:23 -0600 (Tue, 25 Apr 2006) $

Author:

Nissim Karpenstein

Constructor Summary

Constructors

Constructor and Description
Lexer(String oqlQueryString) Creates a lexer which will seperate a string query into a series of tokens.

Method Summary

Methods

Modifier and Type	Method and Description
boolean	hasMoreTokens() Checks whether the query strin has been fully consumed.
Token	nextToken() Returns the next Token from the stream.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Lexer

public Lexer(String oqlQueryString)

Creates a lexer which will seperate a string query into a series of tokens.

Parameters:

oqlQueryString - The string representation of the OQL Query

Method Detail

hasMoreTokens

public boolean hasMoreTokens()

Checks whether the query strin has been fully consumed.

Returns:

True if there is text in the query which hasn't been tokenized, otherwise false.

nextToken

public Token nextToken()
                throws InvalidCharException

Returns the next Token from the stream.

Returns:

The next token in the stream.

Throws:

InvalidCharException - if an invalid character is found while generating the next Token.