jimm.datavision.source.sql
Class ParserHelper

java.lang.Object
  jimm.datavision.source.sql.ParserHelper

public class ParserHelper
extends java.lang.Object

A helper class used by a SQL query while parsing the WHERE clause.

Author:

Jim Menard, jimm@io.com

See Also:

SQLQuery

Field Summary

protected int	endBeforeToken
protected java.lang.String	prevToken
protected int	prevTokenStartPos
protected int	startPos
protected java.lang.String	str

Constructor Summary

ParserHelper(java.lang.String s, int pos)

Method Summary

protected void	findPreviousSQLToken() Finds the token before the one that starts at startPos in str.
int	getEndBeforeToken()
java.lang.String	getPrevToken() Returns the previous token, sans whitespace.
int	getPrevTokenStartPos() Returns the starting position of the previous token in the original string, not including any leading whitespace.

Methods inherited from class java.lang.Object

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

Field Detail

str

protected java.lang.String str

startPos

protected int startPos

prevToken

protected java.lang.String prevToken

prevTokenStartPos

protected int prevTokenStartPos

endBeforeToken

protected int endBeforeToken

Constructor Detail

ParserHelper

public ParserHelper(java.lang.String s,
                    int pos)

Method Detail

findPreviousSQLToken

protected void findPreviousSQLToken()

Finds the token before the one that starts at startPos in str. The token will not include the whitespace surrounding it, if any.

getPrevToken

public java.lang.String getPrevToken()

Returns the previous token, sans whitespace.

Returns:

a possibly empty string

getPrevTokenStartPos

public int getPrevTokenStartPos()

Returns the starting position of the previous token in the original string, not including any leading whitespace.

Returns:

a string index pointing to the start of the previous token

getEndBeforeToken

public int getEndBeforeToken()