com.orientechnologies.common.parser

Class OBaseParser

java.lang.Object

com.orientechnologies.common.parser.OBaseParser

Direct Known Subclasses:

OCommandExecutorAbstract, OSQLPredicate, OSQLTarget

public abstract class OBaseParser
extends Object

Abstract generic command to parse.

Author:

Luca Garulli (l.garulli--(at)--orientdb.com)

Field Summary

Fields

Modifier and Type	Field and Description
String	parserText
String	parserTextUpperCase

Constructor Summary

Constructors

Constructor and Description
OBaseParser()

Method Summary

Modifier and Type	Method and Description
int	getLastWordLength()
String	getSyntax()
static void	getWordStatic(CharSequence iText, int iBeginIndex, String iSeparatorChars, StringBuilder ioBuffer)
static int	nextWord(String iText, String iTextUpperCase, int ioCurrentPosition, StringBuilder ioWord, boolean iForceUpperCase)
static int	nextWord(String iText, String iTextUpperCase, int ioCurrentPosition, StringBuilder ioWord, boolean iForceUpperCase, String iSeparatorChars)
protected String	parseOptionalWord(boolean iUpperCase, String... iWords) Parses the next word.
char	parserGetCurrentChar() Returns the current character in the current stream position
int	parserGetCurrentPosition() Returns the current stream position.
char	parserGetLastSeparator() Returns the last separator encountered, otherwise returns a blank (' ').
String	parserGetLastWord() Returns the last parsed word.
int	parserGetPreviousPosition() Returns the stream position before last parsing.
protected int	parserGoBack() Goes back to the previous position.
boolean	parserIsEnded() Tells if the parsing has reached the end of the content.
protected boolean	parserMoveCurrentPosition(int iOffset) Moves the current stream position forward or backward of iOffset characters
protected int	parserNextChars(boolean iUpperCase, boolean iMandatory, String... iCandidateWords) Parses the next sequence of chars.
protected String	parserNextWord(boolean iForceUpperCase) Parses the next word.
protected String	parserNextWord(boolean iForceUpperCase, String iSeparatorChars) Parses the next word.
protected String	parserNextWord(boolean iForceUpperCase, String iSeparatorChars, boolean preserveEscapes)
protected boolean	parserOptionalKeyword(String... iWords) Parses optional keywords between the iWords.
protected String	parserOptionalWord(boolean iUpperCase) Parses the next word.
protected void	parserRequiredKeyword(String... iWords) Parses the next word.
protected String	parserRequiredWord(boolean iUpperCase) Parses the next word.
protected String	parserRequiredWord(boolean iUpperCase, String iCustomMessage) Parses the next word.
protected String	parserRequiredWord(boolean iUpperCase, String iCustomMessage, String iSeparators) Parses the next word.
protected boolean	parserSetCurrentPosition(int iPosition) Overwrites the current stream position.
protected void	parserSetEndOfText() Sets the end of text as position
void	parserSetLastSeparator(char iSeparator) Overwrites the last separator.
protected boolean	parserSkipWhiteSpaces() Skips not valid characters like spaces and line feeds.
protected abstract void	throwSyntaxErrorException(String iText) Throws a syntax error exception.

Methods inherited from class java.lang.Object

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

Field Detail

parserText

public String parserText

parserTextUpperCase

public String parserTextUpperCase

Constructor Detail

OBaseParser

public OBaseParser()

Method Detail

nextWord

public static int nextWord(String iText,
                           String iTextUpperCase,
                           int ioCurrentPosition,
                           StringBuilder ioWord,
                           boolean iForceUpperCase)

nextWord

public static int nextWord(String iText,
                           String iTextUpperCase,
                           int ioCurrentPosition,
                           StringBuilder ioWord,
                           boolean iForceUpperCase,
                           String iSeparatorChars)

getWordStatic

public static void getWordStatic(CharSequence iText,
                                 int iBeginIndex,
                                 String iSeparatorChars,
                                 StringBuilder ioBuffer)

Parameters:

iText - Text where to search

iBeginIndex - Begin index

iSeparatorChars - Separators as a String of multiple characters

ioBuffer - StringBuilder object with the word found

getSyntax

public String getSyntax()

parserGetLastSeparator

public char parserGetLastSeparator()

Returns the last separator encountered, otherwise returns a blank (' ').

parserSetLastSeparator

public void parserSetLastSeparator(char iSeparator)

Overwrites the last separator. To ignore it set it to blank (' ').

parserGetPreviousPosition

public int parserGetPreviousPosition()

Returns the stream position before last parsing.

Returns:

Offset from the beginning

parserIsEnded

public boolean parserIsEnded()

Tells if the parsing has reached the end of the content.

Returns:

True if is ended, otherwise false

parserGetCurrentPosition

public int parserGetCurrentPosition()

Returns the current stream position.

Returns:

Offset from the beginning

parserGetCurrentChar

public char parserGetCurrentChar()

Returns the current character in the current stream position

Returns:

The current character in the current stream position. If the end is reached, then a blank (' ') is returned

parserGetLastWord

public String parserGetLastWord()

Returns the last parsed word.

Returns:

Last parsed word as String

getLastWordLength

public int getLastWordLength()

throwSyntaxErrorException

protected abstract void throwSyntaxErrorException(String iText)

Throws a syntax error exception.

Parameters:

iText - Text about the problem.

parserOptionalWord

protected String parserOptionalWord(boolean iUpperCase)

Parses the next word. It returns the word parsed if any.

Parameters:

iUpperCase - True if must return UPPERCASE, otherwise false

Returns:

The word parsed if any, otherwise null

parseOptionalWord

protected String parseOptionalWord(boolean iUpperCase,
                                   String... iWords)

Parses the next word. If any word is parsed it's checked against the word array received as parameter. If the parsed word is not enlisted in it a SyntaxError exception is thrown. It returns the word parsed if any.

Parameters:

iUpperCase - True if must return UPPERCASE, otherwise false

Returns:

The word parsed if any, otherwise null

parserGoBack

protected int parserGoBack()

Goes back to the previous position.

Returns:

The previous position

parserRequiredWord

protected String parserRequiredWord(boolean iUpperCase)

Parses the next word. If no word is found an SyntaxError exception is thrown It returns the word parsed if any.

Parameters:

iUpperCase - True if must return UPPERCASE, otherwise false

Returns:

The word parsed

parserRequiredWord

protected String parserRequiredWord(boolean iUpperCase,
                                    String iCustomMessage)

Parses the next word. If no word is found an SyntaxError exception with the custom message received as parameter is thrown It returns the word parsed if any.

Parameters:

iUpperCase - True if must return UPPERCASE, otherwise false

iCustomMessage - Custom message to include in case of SyntaxError exception

Returns:

The word parsed

parserRequiredWord

protected String parserRequiredWord(boolean iUpperCase,
                                    String iCustomMessage,
                                    String iSeparators)

Parses the next word. If no word is found or the parsed word is not present in the word array received as parameter then a SyntaxError exception with the custom message received as parameter is thrown. It returns the word parsed if any.

Parameters:

iUpperCase - True if must return UPPERCASE, otherwise false

iCustomMessage - Custom message to include in case of SyntaxError exception

iSeparators - Separator characters

Returns:

The word parsed

parserRequiredKeyword

protected void parserRequiredKeyword(String... iWords)

Parses the next word. If no word is found or the parsed word is not present in the word array received as parameter then a SyntaxError exception is thrown.

Parameters:

iWords - Array of expected keywords

parserNextChars

protected int parserNextChars(boolean iUpperCase,
                              boolean iMandatory,
                              String... iCandidateWords)

Parses the next sequence of chars.

Returns:

The position of the word matched if any, otherwise -1 or an exception if iMandatory is true

parserOptionalKeyword

protected boolean parserOptionalKeyword(String... iWords)

Parses optional keywords between the iWords. If a keyword is found but doesn't match with iWords then a SyntaxError is raised.

Parameters:

iWords - Optional words to match as keyword. If at least one is passed, then the check is made

Returns:

true if a keyword was found, otherwise false

parserSkipWhiteSpaces

protected boolean parserSkipWhiteSpaces()

Skips not valid characters like spaces and line feeds.

Returns:

True if the string is not ended, otherwise false

parserSetCurrentPosition

protected boolean parserSetCurrentPosition(int iPosition)

Overwrites the current stream position.

Parameters:

iPosition - New position

Returns:

True if the string is not ended, otherwise false

parserSetEndOfText

protected void parserSetEndOfText()

Sets the end of text as position

parserMoveCurrentPosition

protected boolean parserMoveCurrentPosition(int iOffset)

Moves the current stream position forward or backward of iOffset characters

Parameters:

iOffset - Number of characters to move. Negative numbers means backwards

Returns:

True if the string is not ended, otherwise false

parserNextWord

protected String parserNextWord(boolean iForceUpperCase)

Parses the next word.

Parameters:

iForceUpperCase - True if must return UPPERCASE, otherwise false

parserNextWord

protected String parserNextWord(boolean iForceUpperCase,
                                String iSeparatorChars)

Parses the next word.

Parameters:

iForceUpperCase - True if must return UPPERCASE, otherwise false

iSeparatorChars -

parserNextWord

protected String parserNextWord(boolean iForceUpperCase,
                                String iSeparatorChars,
                                boolean preserveEscapes)