org.apache.torque.engine.sql
Class SQLScanner

java.lang.Object
  org.apache.torque.engine.sql.SQLScanner

public class SQLScanner
extends Object

A simple Scanner implementation that scans an sql file into usable tokens. Used by SQLToAppData.

Version:

$Id: SQLScanner.java,v 1.1 2007-10-21 07:57:27 abyrne Exp $

Author:

Leon Messerschmidt, Jon S. Stevens, Andreas Andreou

Field Summary

private static String	ALFA alphabetic characters
private static String	ALFANUM alphanumeric
private int	chr character
private int	col column
private static char	COMMENT_DASH comment
private static char	COMMENT_POUND comment
private static char	COMMENT_SLASH comment
private static char	COMMENT_STAR comment
private Reader	in the input reader
private int	line line
private static String	NUMER numbers
private static String	SPECIAL special characters
private String	token token
private List	tokens list of tokens
private static String	WHITE white spaces

Constructor Summary

SQLScanner()
Creates a new scanner with no Reader

SQLScanner(Reader input)
Creates a new scanner with an Input Reader

Method Summary

private void	readChar() Reads the next character and increments the line and column counters.
List	scan() Scan the input Reader and returns a list of tokens.
private void	scanIdentifier() Scans an identifier.
private void	scanNegativeIdentifier() Scans an identifier which had started with the negative sign.
void	setInput(Reader input) Set the Input

Methods inherited from class java.lang.Object

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

Field Detail

WHITE

private static final String WHITE

white spaces

See Also:

Constant Field Values

ALFA

private static final String ALFA

alphabetic characters

See Also:

Constant Field Values

NUMER

private static final String NUMER

numbers

See Also:

Constant Field Values

ALFANUM

private static final String ALFANUM

alphanumeric

See Also:

Constant Field Values

SPECIAL

private static final String SPECIAL

special characters

See Also:

Constant Field Values

COMMENT_POUND

private static final char COMMENT_POUND

comment

See Also:

Constant Field Values

COMMENT_SLASH

private static final char COMMENT_SLASH

comment

See Also:

Constant Field Values

COMMENT_STAR

private static final char COMMENT_STAR

comment

See Also:

Constant Field Values

COMMENT_DASH

private static final char COMMENT_DASH

comment

See Also:

Constant Field Values

in

private Reader in

the input reader

chr

private int chr

character

token

private String token

token

tokens

private List tokens

list of tokens

line

private int line

line

col

private int col

column

Constructor Detail

SQLScanner

public SQLScanner()

Creates a new scanner with no Reader

SQLScanner

public SQLScanner(Reader input)

Creates a new scanner with an Input Reader

Parameters:

input - the input reader

Method Detail

setInput

public void setInput(Reader input)

Set the Input

Parameters:

input - the input reader

readChar

private void readChar()
               throws IOException

Reads the next character and increments the line and column counters.

Throws:

IOException - If an I/O error occurs

scanIdentifier

private void scanIdentifier()
                     throws IOException

Scans an identifier.

Throws:

IOException - If an I/O error occurs

scanNegativeIdentifier

private void scanNegativeIdentifier()
                             throws IOException

Scans an identifier which had started with the negative sign.

Throws:

IOException - If an I/O error occurs

scan

public List scan()
          throws IOException

Scan the input Reader and returns a list of tokens.

Returns:

a list of tokens

Throws:

IOException - If an I/O error occurs