com.mysql.cj.util

Class StringInspector

java.lang.Object

com.mysql.cj.util.StringInspector

public class StringInspector
extends Object

Utility class to inspect a MySQL string, typically a query string. Provides string searching and manipulation operations such as finding sub-strings, matching sub-strings or building a comments-free version of a string. This object keeps internal state that affect the operations, e.g., executing an indexOf operation after another causes the second to start the search form where the previous one stopped.

Field Summary

Fields

Modifier and Type	Field and Description
private String	closingMarkers
private Set<SearchMode>	defaultSearchMode
private boolean	escaped
private boolean	inMysqlBlock
private boolean	markedEscape
private boolean	markedInMysqlBlock
private int	markedPos
private int	markedStopAt
private static int	NON_COMMENTS_MYSQL_VERSION_REF_LENGTH
private String	openingMarkers
private String	overridingMarkers
private int	pos
private String	source
private int	srcLen
private int	stopAt

Constructor Summary

Constructors

Constructor and Description
StringInspector(String source, int startingPosition, String openingMarkers, String closingMarkers, String overridingMarkers, Set<SearchMode> searchMode) This object provides string searching and manipulation operations such as finding sub-strings, matching sub-strings or building a comments-free version of a string.
StringInspector(String source, String openingMarkers, String closingMarkers, String overridingMarkers, Set<SearchMode> searchMode) This object provides string searching and manipulation operations such as finding sub-strings, matching sub-strings or building a comments-free version of a string.

Method Summary

Modifier and Type	Method and Description
char	getChar() Returns the character in the current position.
int	getPosition() Returns the current position.
int	incrementPosition() Increments the current position index, by one, taking into consideration the "escaped" status of current character, if the mode SearchMode.ALLOW_BACKSLASH_ESCAPE is present in the default search mode.
int	incrementPosition(int by) Increments the current position index, by be given number, taking into consideration the "escaped" status of current character, if the mode SearchMode.ALLOW_BACKSLASH_ESCAPE is present in the default search mode.
int	incrementPosition(int by, Set<SearchMode> searchMode) Increments the current position index, by be given number, taking into consideration the "escaped" status of current character, if the mode SearchMode.ALLOW_BACKSLASH_ESCAPE is present in the specified search mode.
int	incrementPosition(Set<SearchMode> searchMode) Increments the current position index, by one, taking into consideration the "escaped" status of current character, if the mode SearchMode.ALLOW_BACKSLASH_ESCAPE is present in the search mode specified.
private int	indexOfClosingMarker(Set<SearchMode> searchMode) Returns the position of the next closing marker corresponding to the opening marker in the current position.
int	indexOfIgnoreCase(String... searchFor) Finds the position of the of the first of a consecutive sequence of strings within the source string, ignoring case, with the option to skip text delimited by the specified markers or inside comment blocks.
int	indexOfIgnoreCase(String searchFor) Finds the position of the given string within the source string, ignoring case, with the option to skip text delimited by the specified markers or inside comment blocks.
int	indexOfIgnoreCase(String searchFor, Set<SearchMode> searchMode) Finds the position of the given string within the source string, ignoring case, with the option to skip text delimited by the specified markers or inside comment blocks.
int	indexOfNextAlphanumericChar() Returns the position of the next alphanumeric character regardless the default search mode originally specified.
int	indexOfNextChar() Returns the position of the next valid character.
private int	indexOfNextChar(Set<SearchMode> searchMode) Returns the position of the next valid character using the given search mode instead of the default one.
int	indexOfNextNonWsChar() Returns the position of the next non-whitespace character regardless the default search mode originally specified.
int	indexOfNextWsChar() Returns the position of the next whitespace character regardless the default search mode originally specified.
void	mark() Marks the current object's state.
int	matchesIgnoreCase(String... toMatch) Checks if the given consecutive sequence of strings matches the source string counting from the current position, ignoring case, with the option to skip text delimited by the specified markers or inside comment blocks.
int	matchesIgnoreCase(String toMatch) Checks if the given string matches the source string counting from the current position, ignoring case, with the option to skip text delimited by the specified markers or inside comment blocks.
void	reset() Resets this object's state to previously mark state.
private void	resetEscaped() Checks if the current character is escaped by analyzing previous characters, as long as the search mode SearchMode.ALLOW_BACKSLASH_ESCAPE is present in the default search mode.
void	restart() Resets this object's state to original values.
int	setStartPosition(int pos) Sets the position from where the source string will be processed from now on, taking into consideration the "escaped" status of current character, if the mode SearchMode.ALLOW_BACKSLASH_ESCAPE is present in the default search mode.
int	setStopPosition(int pos) Sets the position where the source string processing will stop.
List<String>	split(String delimiter, boolean trim) Splits the source string by the given delimiter.
String	stripCommentsAndHints() Returns a copy of the source string stripped of all comments and hints.

Methods inherited from class java.lang.Object

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

Field Detail

NON_COMMENTS_MYSQL_VERSION_REF_LENGTH

private static final int NON_COMMENTS_MYSQL_VERSION_REF_LENGTH

See Also:

Constant Field Values

source

private String source

openingMarkers

private String openingMarkers

closingMarkers

private String closingMarkers

overridingMarkers

private String overridingMarkers

defaultSearchMode

private Set<SearchMode> defaultSearchMode

srcLen

private int srcLen

pos

private int pos

stopAt

private int stopAt

escaped

private boolean escaped

inMysqlBlock

private boolean inMysqlBlock

markedPos

private int markedPos

markedStopAt

private int markedStopAt

markedEscape

private boolean markedEscape

markedInMysqlBlock

private boolean markedInMysqlBlock

Constructor Detail

StringInspector

public StringInspector(String source,
                       String openingMarkers,
                       String closingMarkers,
                       String overridingMarkers,
                       Set<SearchMode> searchMode)

This object provides string searching and manipulation operations such as finding sub-strings, matching sub-strings or building a comments-free version of a string.

Parameters:

source - the source string to process

openingMarkers - the characters that can delimit the beginning of a quoted text block

closingMarkers - the characters that can delimit the end of a of a quoted text block. The length of this parameter must match the length of th previous one

overridingMarkers - the subset of openingMarkers that override the remaining markers, e.g., if openingMarkers = "'(", closingMarkers = "')" and overridingMarkers = "'" then the block between the outer parenthesis in "start ('max('); end" is strictly consumed, otherwise the suffix "'); end" would end up being consumed too in the process of handling the nested parenthesis.

searchMode - a Set, ideally an EnumSet, containing the default flags from the enum SearchMode that determine the behavior of the search and manipulation operations. Note that some operation may override the search mode according to their needs, but the default one is not touched.

StringInspector

public StringInspector(String source,
                       int startingPosition,
                       String openingMarkers,
                       String closingMarkers,
                       String overridingMarkers,
                       Set<SearchMode> searchMode)

This object provides string searching and manipulation operations such as finding sub-strings, matching sub-strings or building a comments-free version of a string.

Parameters:

source - the source string to process

startingPosition - the position from where the source string will be processed

openingMarkers - the characters that can delimit the beginning of a quoted text block

closingMarkers - the characters that can delimit the end of a of a quoted text block. The length of this parameter must match the length of th previous one

overridingMarkers - the subset of openingMarkers that override the remaining markers, e.g., if openingMarkers = "'(", closingMarkers = "')" and overridingMarkers = "'" then the block between the outer parenthesis in "start ('max('); end" is strictly consumed, otherwise the suffix "'); end" would end up being consumed too in the process of handling the nested parenthesis.

searchMode - a Set, ideally an EnumSet, containing the default flags from the enum SearchMode that determine the behavior of the search and manipulation operations. Note that some operation may override the search mode according to their needs, but the default one is not touched.

Method Detail

setStartPosition

public int setStartPosition(int pos)

Sets the position from where the source string will be processed from now on, taking into consideration the "escaped" status of current character, if the mode SearchMode.ALLOW_BACKSLASH_ESCAPE is present in the default search mode.

Parameters:

pos - the position from where the source string will be processed

Returns:

the previous current position value

setStopPosition

public int setStopPosition(int pos)

Sets the position where the source string processing will stop.

Parameters:

pos - the position where the source string will stop being processed

Returns:

the previous stop position value

mark

public void mark()

Marks the current object's state. A subsequent call to the reset() method restores the marked state.

reset

public void reset()

Resets this object's state to previously mark state.

restart

public void restart()

Resets this object's state to original values. Allows to reuse the object from a fresh start.

getChar

public char getChar()

Returns the character in the current position.

Returns:

the character in the current position

getPosition

public int getPosition()

Returns the current position.

Returns:

the current position

incrementPosition

public int incrementPosition()

Increments the current position index, by one, taking into consideration the "escaped" status of current character, if the mode SearchMode.ALLOW_BACKSLASH_ESCAPE is present in the default search mode.

Returns:

the new current position

incrementPosition

public int incrementPosition(Set<SearchMode> searchMode)

Increments the current position index, by one, taking into consideration the "escaped" status of current character, if the mode SearchMode.ALLOW_BACKSLASH_ESCAPE is present in the search mode specified.

Parameters:

searchMode - the search mode to use in this operation

Returns:

the new current position

incrementPosition

public int incrementPosition(int by)

Increments the current position index, by be given number, taking into consideration the "escaped" status of current character, if the mode SearchMode.ALLOW_BACKSLASH_ESCAPE is present in the default search mode.

Parameters:

by - the number of positions to increment

Returns:

the new current position

incrementPosition

public int incrementPosition(int by,
                             Set<SearchMode> searchMode)

Increments the current position index, by be given number, taking into consideration the "escaped" status of current character, if the mode SearchMode.ALLOW_BACKSLASH_ESCAPE is present in the specified search mode.

Parameters:

by - the number of positions to increment

searchMode - the search mode to use in this operation

Returns:

the new current position

resetEscaped

private void resetEscaped()

Checks if the current character is escaped by analyzing previous characters, as long as the search mode SearchMode.ALLOW_BACKSLASH_ESCAPE is present in the default search mode.

indexOfNextChar

public int indexOfNextChar()

Returns the position of the next valid character. This method does not increment the current position automatically, i.e., if already positioned in a valid character then repeated calls return always the same index. If the character in the current position matches one of the prefixes that determine a skipping block, then the position marker advances to the first character after the block to skip.

Returns:

the position of the next valid character, or the current position if already on a valid character

indexOfNextChar

private int indexOfNextChar(Set<SearchMode> searchMode)

Returns the position of the next valid character using the given search mode instead of the default one. This method does not increment the current position automatically, i.e., if already positioned in a valid character then repeated calls return always the same index. If the character in the current position matches one of the prefixes that determine a skipping block, then the position marker advances to the first character after the block to skip.

Parameters:

searchMode - the search mode to use in this operation

Returns:

the position of the next valid character, or the current position if already on a valid character

indexOfClosingMarker

private int indexOfClosingMarker(Set<SearchMode> searchMode)

Returns the position of the next closing marker corresponding to the opening marker in the current position. If the current position is not an opening marker, then -1 is returned instead.

Parameters:

searchMode - the search mode to use in this operation

Returns:

the position of the next closing marker corresponding to the opening marker in the current position

indexOfNextAlphanumericChar

public int indexOfNextAlphanumericChar()

Returns the position of the next alphanumeric character regardless the default search mode originally specified. This method does not increment the current position automatically, i.e., if already positioned in a valid character then repeated calls return always the same index. If the character in the current position matches one of the prefixes that determine a skipping block, then the position marker advances to the first alphanumeric character after the block to skip.

Returns:

the position of the next valid character, or the current position if already on a valid character

indexOfNextNonWsChar

public int indexOfNextNonWsChar()

Returns the position of the next non-whitespace character regardless the default search mode originally specified. This method does not increment the current position automatically, i.e., if already positioned in a valid character then repeated calls return always the same index. If the character in the current position matches one of the prefixes that determine a skipping block, then the position marker advances to the first non-whitespace character after the block to skip.

Returns:

the position of the next valid character, or the current position if already on a valid character

indexOfNextWsChar

public int indexOfNextWsChar()

Returns the position of the next whitespace character regardless the default search mode originally specified. This method does not increment the current position automatically, i.e., if already positioned in a valid character then repeated calls return always the same index. If the character in the current position matches one of the prefixes that determine a skipping block, then the position marker advances to the first whitespace character after the block to skip.

Returns:

the position of the next valid character, or the current position if already on a valid character

indexOfIgnoreCase

public int indexOfIgnoreCase(String searchFor)

Finds the position of the given string within the source string, ignoring case, with the option to skip text delimited by the specified markers or inside comment blocks.

Parameters:

searchFor - the sub-string to search for

Returns:

the position where the sub-string is found, starting from the current position, or -1 if not found

indexOfIgnoreCase

public int indexOfIgnoreCase(String searchFor,
                             Set<SearchMode> searchMode)

Finds the position of the given string within the source string, ignoring case, with the option to skip text delimited by the specified markers or inside comment blocks.

Parameters:

searchFor - the sub-string to search for

searchMode - the search mode to use in this operation

Returns:

the position where the sub-string is found, starting from the current position, or -1 if not found

indexOfIgnoreCase

public int indexOfIgnoreCase(String... searchFor)

Finds the position of the of the first of a consecutive sequence of strings within the source string, ignoring case, with the option to skip text delimited by the specified markers or inside comment blocks.

Independently of the searchMode specified, when searching for the second and following sub-strings SearchMode.SKIP_WHITE_SPACE will be added and SearchMode.SKIP_BETWEEN_MARKERS removed.

Parameters:

searchFor - the sequence of sub-strings to search

Returns:

the position where the first sub-string is found, starting from the current position, or -1 if not found

matchesIgnoreCase

public int matchesIgnoreCase(String toMatch)

Checks if the given string matches the source string counting from the current position, ignoring case, with the option to skip text delimited by the specified markers or inside comment blocks.

Parameters:

toMatch - the sub-string to match

Returns:

the position where the sub-string match ended, or -1 if not matched

matchesIgnoreCase

public int matchesIgnoreCase(String... toMatch)

Checks if the given consecutive sequence of strings matches the source string counting from the current position, ignoring case, with the option to skip text delimited by the specified markers or inside comment blocks.

Independently of the searchMode specified, when matching the second and following sub-strings SearchMode.SKIP_WHITE_SPACE will be added and SearchMode.SKIP_BETWEEN_MARKERS removed.

Parameters:

toMatch - the sequence of sub-strings to match

Returns:

the position where the sequence of sub-strings match ended, or -1 if not matched

stripCommentsAndHints

public String stripCommentsAndHints()

Returns a copy of the source string stripped of all comments and hints.

Returns:

a comments-free string

split

public List<String> split(String delimiter,
                          boolean trim)

Splits the source string by the given delimiter. Consecutive delimiters result in empty string parts.

Parameters:

delimiter - the characters sequence where to split the source string

trim - whether each one of the parts should be trimmed or not

Returns:

a List containing all the string parts