aa.util
Class Lexer

java.lang.Object
  aa.util.Lexer

public class Lexer

extends java.lang.Object

This class performs tokenizing a input string to separate string tokens.

History:

• February 19, 2004 - version 0.0.3
  • do minor modification.
• May 9, 2003 - version 0.0.2
  • modify internal comments.
• April 7, 2001 - version 0.0.1
  • create this file.

Version:

$Date: 2008/01/01 00:24:06 $ $Revision: 1.1 $

Author:

Myeong-Wuk Jang

Field Summary

private static int

m_iMAX_TOKENS Maximum number of tokens.

Constructor Summary

Lexer()

Method Summary

private static java.lang.String[]	compactString(java.lang.String[] p_straToken, int p_iTokens) Returns an array of tokens that does not have null elements.
static java.lang.String[]	getTokens(java.lang.String p_strInput) Extracts string tokens from the given input string, and returns them.
private static java.lang.String	removeBlank(java.lang.String p_strInput) Removes blanks in the front part of the specified string.

Methods inherited from class java.lang.Object

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

Field Detail

m_iMAX_TOKENS

private static final int m_iMAX_TOKENS

Maximum number of tokens.

See Also:

Constant Field Values

Constructor Detail

Lexer

public Lexer()

Method Detail

removeBlank

private static java.lang.String removeBlank(java.lang.String p_strInput)

Removes blanks in the front part of the specified string.

Parameters:

p_strInput - an input string

Returns:

the string whose front blanks are removed if the input string has valid characters;
null otherwise.

compactString

private static java.lang.String[] compactString(java.lang.String[] p_straToken,
                                                int p_iTokens)

Returns an array of tokens that does not have null elements.

Parameters:

p_straToken - an array of string tokens which has null elements. p_iTokens the number of no-null string tokens in the p_straToken array.

Returns:

an array of tokens that does not have null elements if the input array has valid tokens;
null otherwise.

getTokens

public static java.lang.String[] getTokens(java.lang.String p_strInput)

Extracts string tokens from the given input string, and returns them.

Parameters:

p_strInput - the input string.

Returns:

an array of string tokens if the input has valid tokens;
null otherwise.