net.sf.mmm.util.scanner.base
Class AbstractCharScannerSyntax

java.lang.Object
  net.sf.mmm.util.scanner.base.AbstractCharScannerSyntax

All Implemented Interfaces:

CharScannerSyntax

Direct Known Subclasses:

SimpleCharScannerSyntax

public abstract class AbstractCharScannerSyntax
extends Object
implements CharScannerSyntax

This is the abstract base implementation of the CharScannerSyntax interface.
The actual chars like escape are realized as simple bean-properties and initialized with '\0' so they are disabled by default.

Since:

1.0.0

Author:

Joerg Hohwiller (hohwille at users.sourceforge.net)

See Also:

CharStreamScanner.readUntil(char, boolean, CharScannerSyntax)

Field Summary

private char	altQuoteEnd
private char	altQuoteEscape
private boolean	altQuoteEscapeLazy
private char	altQuoteStart
private char	entityEnd
private char	entityStart
private char	escape
private char	quoteEnd
private char	quoteEscape
private boolean	quoteEscapeLazy
private char	quoteStart

Constructor Summary

AbstractCharScannerSyntax()
The constructor.

Method Summary

char	getAltQuoteEnd() This method gets the alternative character used to end a quotation.
char	getAltQuoteEscape() This method gets the character used to escape the alt-quote-end character within an quotation opened by alt-quote-start.
char	getAltQuoteStart() This method gets the alternative character used to start a quotation that should be terminated by a alt-quote-end character.
char	getEntityEnd() This method gets the character used to end an entity.
char	getEntityStart() This method gets the character used to start an entity.
char	getEscape() This method gets the character used as escape.
char	getQuoteEnd() This method gets the character used to end a quotation.
char	getQuoteEscape() This method gets the character used to escape the quote-end character within a quotation.
char	getQuoteStart() This method gets the character used to start a quotation that should be terminated by a quote-end character.
boolean	isAltQuoteEscapeLazy() If alt-quote-start, alt-quote-end and alt-quote-escape all point to the same character (which is NOT '\0'), then this method determines if alt-quotation escaping is lazy.
boolean	isQuoteEscapeLazy() If quote-start, quote-end and quote-escape all point to the same character (which is NOT '\0'), then this method determines if quotation escaping is lazy.
String	resolveEntity(String entity) This method resolves the given entity.
void	setAltQuote(char altQuote) This method sets both the alt-quote-start and alt-quote-end character.
void	setAltQuoteEnd(char alternativeQuoteEnd) This method sets the alt-quote-end character.
void	setAltQuoteEscape(char altQuoteEscape)
void	setAltQuoteEscapeLazy(boolean altQuoteEscapeLazy)
void	setAltQuoteStart(char alternativeQuoteStart)
void	setEntityEnd(char entityEnd)
void	setEntityStart(char entityStart)
void	setEscape(char escape)
void	setQuote(char quote) This method sets both the quote-start and quote-end character.
void	setQuoteEnd(char quoteEnd)
void	setQuoteEscape(char quoteEscape)
void	setQuoteEscapeLazy(boolean quoteEscapeLazy)
void	setQuoteStart(char quoteStart)

Methods inherited from class java.lang.Object

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

Field Detail

escape

private char escape

See Also:

getEscape()

quoteStart

private char quoteStart

See Also:

getQuoteStart()

quoteEnd

private char quoteEnd

See Also:

getQuoteEnd()

quoteEscape

private char quoteEscape

See Also:

getQuoteEscape()

quoteEscapeLazy

private boolean quoteEscapeLazy

See Also:

isQuoteEscapeLazy()

altQuoteStart

private char altQuoteStart

See Also:

getAltQuoteStart()

altQuoteEnd

private char altQuoteEnd

See Also:

getAltQuoteEnd()

altQuoteEscape

private char altQuoteEscape

See Also:

getAltQuoteEscape()

altQuoteEscapeLazy

private boolean altQuoteEscapeLazy

See Also:

isAltQuoteEscapeLazy()

entityStart

private char entityStart

See Also:

getEntityStart()

entityEnd

private char entityEnd

See Also:

getEntityEnd()

Constructor Detail

AbstractCharScannerSyntax

public AbstractCharScannerSyntax()

The constructor.

Method Detail

getEscape

public char getEscape()

This method gets the character used as escape. The escape itself is omitted in the decoded output while the next character is taken as is without any special interpretation. This allows to encode special characters like a stop-character, quote-start, alt-quote-start, as well as the escape itself.
A very common example for an escape character is the backslash ( \).
Here are some examples:

escape	input	output
\	a\b\\c	ab\c
~	a~b~~~c	ab~c

ATTENTION:
The escape is disabled within quotations.

Specified by:

getEscape in interface CharScannerSyntax

Returns:

the escape character or 0 ('\0') for no escaping.

See Also:

CharScannerSyntax.getEntityStart()

setEscape

public void setEscape(char escape)

Parameters:

escape - is the escape character to set.

getQuoteStart

public char getQuoteStart()

This method gets the character used to start a quotation that should be terminated by a quote-end character. The text inside the quote is taken as is (without the quote characters).
Common examples for quote characters are the single quotes (') and double quotes (").

Specified by:

getQuoteStart in interface CharScannerSyntax

Returns:

the character used to start a quotation or 0 ( '\0') to disable.

setQuoteStart

public void setQuoteStart(char quoteStart)

Parameters:

quoteStart - is the quote-start character to set.

getQuoteEnd

public char getQuoteEnd()

This method gets the character used to end a quotation.

Specified by:

getQuoteEnd in interface CharScannerSyntax

Returns:

the character used to end a quotation.

See Also:

CharScannerSyntax.getQuoteStart()

setQuoteEnd

public void setQuoteEnd(char quoteEnd)

Parameters:

quoteEnd - is the quote-end character to set.

setQuote

public void setQuote(char quote)

This method sets both the quote-start and quote-end character.

Parameters:

quote - the quote character to set.

getQuoteEscape

public char getQuoteEscape()

This method gets the character used to escape the quote-end character within a quotation. This may be the quote-end itself so a duplicate quote-end represents a single occurrence of that character within a quotation. Otherwise the escape may be any other character.
Please note that this escaping is only active within a quotation opened by quote-start and only escapes the quote-end character and nothing else so in any other case the quote-escape is treated as a regular character.

quote-start	quote-end	quote-escape	input	output
'	'	'	a'bc'd	abcd
'	'	'	a'b''c'd	ab'cd
'	'	\	a'b\c\'d\\'e'f	ab\c'd\'ef

Specified by:

getQuoteEscape in interface CharScannerSyntax

Returns:

the character used to escape the quote-end character or 0 ('\0') to disable.

setQuoteEscape

public void setQuoteEscape(char quoteEscape)

Parameters:

quoteEscape - is the quote-escape to set.

isQuoteEscapeLazy

public boolean isQuoteEscapeLazy()

If quote-start, quote-end and quote-escape all point to the same character (which is NOT '\0'), then this method determines if quotation escaping is lazy. This means that outside a quotation a double occurrence of the quote character is NOT treated as quotation but as escaped quote character. Otherwise if NOT lazy, the double quote character is treated as quotation representing the empty sequence.
Here are some examples:

quote-start	quote-end	quote-escape	quote-escape-lazy	input	output
'	'	'	true	''	'
'	'	'	false	''
'	'	'	true	''''	''
'	'	'	false	''''	'
'	'	'	true	'''a'	'a
'	'	'	false	'''a'	'a

Please note that for '''a' the complete sequence is treated as quote if quote-escape-lazy is false and otherwise just the trailing 'a'.

Specified by:

isQuoteEscapeLazy in interface CharScannerSyntax

Returns:

true if quote-escaping is lazy, false otherwise.

setQuoteEscapeLazy

public void setQuoteEscapeLazy(boolean quoteEscapeLazy)

Parameters:

quoteEscapeLazy - the quote-escape-lazy flag to set

getAltQuoteStart

public char getAltQuoteStart()

This method gets the alternative character used to start a quotation that should be terminated by a alt-quote-end character. The text inside the quote is taken as is (without the quote characters).

Specified by:

getAltQuoteStart in interface CharScannerSyntax

Returns:

the alternative character used to start a quotation or 0 ('\0') for no quotation.

See Also:

getQuoteStart()

setAltQuoteStart

public void setAltQuoteStart(char alternativeQuoteStart)

Parameters:

alternativeQuoteStart - is the alt-quote-start character to set.

getAltQuoteEnd

public char getAltQuoteEnd()

This method gets the alternative character used to end a quotation.

Specified by:

getAltQuoteEnd in interface CharScannerSyntax

Returns:

the alternative character used to end a quotation.

See Also:

getAltQuoteStart()

setAltQuoteEnd

public void setAltQuoteEnd(char alternativeQuoteEnd)

This method sets the alt-quote-end character.

Parameters:

alternativeQuoteEnd - is the alt-quote-end character.

setAltQuote

public void setAltQuote(char altQuote)

This method sets both the alt-quote-start and alt-quote-end character.

Parameters:

altQuote - the alt-quote character to set.

getAltQuoteEscape

public char getAltQuoteEscape()

This method gets the character used to escape the alt-quote-end character within an quotation opened by alt-quote-start.

Specified by:

getAltQuoteEscape in interface CharScannerSyntax

Returns:

the character used to escape the quote-end character or 0 ('\0') to disable.

See Also:

CharScannerSyntax.getQuoteEscape()

setAltQuoteEscape

public void setAltQuoteEscape(char altQuoteEscape)

Parameters:

altQuoteEscape - is the alt-quote-escape to set.

isAltQuoteEscapeLazy

public boolean isAltQuoteEscapeLazy()

If alt-quote-start, alt-quote-end and alt-quote-escape all point to the same character (which is NOT '\0'), then this method determines if alt-quotation escaping is lazy.

Specified by:

isAltQuoteEscapeLazy in interface CharScannerSyntax

Returns:

true if alt-quote-escaping is lazy, false otherwise.

See Also:

CharScannerSyntax.isQuoteEscapeLazy()

setAltQuoteEscapeLazy

public void setAltQuoteEscapeLazy(boolean altQuoteEscapeLazy)

Parameters:

altQuoteEscapeLazy - the alt-quote-lazy flag to set

getEntityStart

public char getEntityStart()

This method gets the character used to start an entity. An entity is a specific encoded string surrounded with entity-start and entity-end. It will be decoded by CharScannerSyntax.resolveEntity(String).

Specified by:

getEntityStart in interface CharScannerSyntax

Returns:

the character used to start an entity or 0 ( '\0') to disable.

setEntityStart

public void setEntityStart(char entityStart)

Parameters:

entityStart - the entity-start to set.

getEntityEnd

public char getEntityEnd()

This method gets the character used to end an entity.

Specified by:

getEntityEnd in interface CharScannerSyntax

Returns:

the character used to end an entity.

See Also:

CharScannerSyntax.getEntityStart()

setEntityEnd

public void setEntityEnd(char entityEnd)

Parameters:

entityEnd - the entity-end to set.

resolveEntity

public String resolveEntity(String entity)

This method resolves the given entity.
E.g. if entity-start is '&' and CharScannerSyntax.getEntityEnd() is ';' then if the string "<" is scanned, this method is called with "lt" as entity argument and may return "<". ATTENTION:
You need to override this method if you want to use entities.

Specified by:

resolveEntity in interface CharScannerSyntax

Parameters:

entity - is the entity string that was found surrounded by entity-start and entity-end excluding these characters.

Returns:

the decoded entity.