com.amazon.redshift.util

Class RedshiftTokenizer

java.lang.Object

com.amazon.redshift.util.RedshiftTokenizer

public class RedshiftTokenizer
extends Object

This class is used to tokenize the text output of com.amazon.redshift. It's mainly used by the geometric classes, but is useful in parsing any output from custom data types output from com.amazon.redshift.

See Also:

RedshiftBox, RedshiftCircle, RedshiftLseg, RedshiftPath, RedshiftPoint, RedshiftPolygon

Field Summary

Fields

Modifier and Type	Field and Description
protected List<String>	tokens

Constructor Summary

Constructors

Constructor and Description
RedshiftTokenizer(String string, char delim) Create a tokeniser.

Method Summary

Methods

Modifier and Type	Method and Description
int	getSize()
String	getToken(int n)
void	remove(String l, String t) This removes the lead/trailing strings from all tokens.
static String	remove(String s, String l, String t) This removes the lead/trailing strings from a string.
void	removeAngle() Removes < and > from the beginning and end of all tokens.
static String	removeAngle(String s) Removes < and > from the beginning and end of a string.
void	removeBox() Removes [ and ] from the beginning and end of all tokens.
static String	removeBox(String s) Removes [ and ] from the beginning and end of a string.
void	removeCurlyBrace() Removes < and > from the beginning and end of all tokens.
static String	removeCurlyBrace(String s) Removes curly braces { and } from the beginning and end of a string.
void	removePara() Removes ( and ) from the beginning and end of all tokens.
static String	removePara(String s) Removes ( and ) from the beginning and end of a string.
int	tokenize(String string, char delim) This resets this tokenizer with a new string and/or delimiter.
RedshiftTokenizer	tokenizeToken(int n, char delim) This returns a new tokenizer based on one of our tokens.

Methods inherited from class java.lang.Object

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

Field Detail

tokens

protected List<String> tokens

Constructor Detail

RedshiftTokenizer

public RedshiftTokenizer(String string,
                 char delim)

Create a tokeniser.

We could have used StringTokenizer to do this, however, we needed to handle nesting of '(' ')' '[' ']' '<' and '>' as these are used by the geometric data types.

Parameters:

string - containing tokens

delim - single character to split the tokens

Method Detail

tokenize

public int tokenize(String string,
           char delim)

This resets this tokenizer with a new string and/or delimiter.

Parameters:

string - containing tokens

delim - single character to split the tokens

Returns:

number of tokens

getSize

public int getSize()

Returns:

the number of tokens available

getToken

public String getToken(int n)

Parameters:

n - Token number ( 0 ... getSize()-1 )

Returns:

The token value

tokenizeToken

public RedshiftTokenizer tokenizeToken(int n,
                              char delim)

This returns a new tokenizer based on one of our tokens.

The geometric datatypes use this to process nested tokens (usually RedshiftPoint).

Parameters:

n - Token number ( 0 ... getSize()-1 )

delim - The delimiter to use

Returns:

A new instance of RedshiftTokenizer based on the token

remove

public static String remove(String s,
            String l,
            String t)

This removes the lead/trailing strings from a string.

Parameters:

s - Source string

l - Leading string to remove

t - Trailing string to remove

Returns:

String without the lead/trailing strings

remove

public void remove(String l,
          String t)

This removes the lead/trailing strings from all tokens.

Parameters:

l - Leading string to remove

t - Trailing string to remove

removePara

public static String removePara(String s)

Removes ( and ) from the beginning and end of a string.

Parameters:

s - String to remove from

Returns:

String without the ( or )

removePara

public void removePara()

Removes ( and ) from the beginning and end of all tokens.

removeBox

public static String removeBox(String s)

Removes [ and ] from the beginning and end of a string.

Parameters:

s - String to remove from

Returns:

String without the [ or ]

removeBox

public void removeBox()

Removes [ and ] from the beginning and end of all tokens.

removeAngle

public static String removeAngle(String s)

Removes < and > from the beginning and end of a string.

Parameters:

s - String to remove from

Returns:

String without the < or >

removeAngle

public void removeAngle()

Removes < and > from the beginning and end of all tokens.

removeCurlyBrace

public static String removeCurlyBrace(String s)

Removes curly braces { and } from the beginning and end of a string.

Parameters:

s - String to remove from

Returns:

String without the { or }

removeCurlyBrace

public void removeCurlyBrace()

Removes < and > from the beginning and end of all tokens.