lt.monarch.math
Class LogicalTokenizer

java.lang.Object
  lt.monarch.math.AbstractTokenizer
      lt.monarch.math.LogicalTokenizer

public class LogicalTokenizer
extends AbstractTokenizer

Tokenizer for the logical expression (formula). Delimiters for this tokenizer are <, >, <=, >=, =, ==, !=, !, (, ), &&, ||, ##

## symbol corresponds to xor operator.

&& - and operator.

|| - or operator.

! - not operator.

< - less operator.

> - more operator.

Field Summary

Modifier and Type	Field and Description

Fields inherited from class lt.monarch.math.AbstractTokenizer

token

Constructor and Description

LogicalTokenizer(java.lang.String formula)
Logical tokenizer constructor

Method Summary

Modifier and Type	Method and Description
void	dispose() Disposes the tokenizer
protected void	finalize()
int	getPosition() Returns the position of the tokenizer.
java.lang.String	getPreviousToken() Return the previous token.
boolean	hasMoreTokens() Checks if the string has more tokens
boolean	isExpression() Checks if the token is numerical formula (not logical)
boolean	isNegation() Checks if the last token is negation
boolean	isOperator() Checks if current token is operator
java.lang.String	nextToken() Returns next token

Methods inherited from class lt.monarch.math.AbstractTokenizer

isLeftBracket, isRightBracket

Methods inherited from class java.lang.Object

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

Constructor Detail

LogicalTokenizer

public LogicalTokenizer(java.lang.String formula)
                 throws java.lang.Exception

Logical tokenizer constructor

Parameters:

formula - logical expression (formula)

Throws:

java.lang.Exception - throws exception if cannot tokenize the string

Method Detail

hasMoreTokens

public boolean hasMoreTokens()

Description copied from class: AbstractTokenizer

Checks if the string has more tokens

Specified by:

hasMoreTokens in class AbstractTokenizer

Returns:

true if has more tokens

nextToken

public java.lang.String nextToken()

Description copied from class: AbstractTokenizer

Returns next token

Specified by:

nextToken in class AbstractTokenizer

Returns:

Next token

getPosition

public int getPosition()

Description copied from class: AbstractTokenizer

Returns the position of the tokenizer.

Specified by:

getPosition in class AbstractTokenizer

Returns:

The position of the tokenizer in the original string.

getPreviousToken

public java.lang.String getPreviousToken()

Description copied from class: AbstractTokenizer

Return the previous token.

Specified by:

getPreviousToken in class AbstractTokenizer

Returns:

Previous token.

dispose

public void dispose()

Description copied from class: AbstractTokenizer

Disposes the tokenizer

Specified by:

dispose in class AbstractTokenizer

isExpression

public boolean isExpression()

Checks if the token is numerical formula (not logical)

Returns:

true if it has numeric value

isOperator

public boolean isOperator()

Checks if current token is operator

Returns:

true if current token is operator

isNegation

public boolean isNegation()

Checks if the last token is negation

Returns:

true if negation is the last token

finalize

protected void finalize()
                 throws java.lang.Throwable

Overrides:

finalize in class java.lang.Object

Throws:

java.lang.Throwable