org.ximtec.igesture.algorithm.siger
Class Parser

java.lang.Object
  org.ximtec.igesture.algorithm.siger.Parser

public class Parser
extends Object

Parses the textual description of a gesture class.

Version:

1.0 Dec 2006

Author:

Ueli Kurmann, igesture@uelikurmann.ch, Beat Signer, signer@inf.ethz.ch

Nested Class Summary

static class	Parser.BooleanOperators Boolean operators.
static class	Parser.Operator Operators of Siger's description language.

Constructor Summary

Parser(String expression)
Parses a string containing a description.

Method Summary

static boolean	evaluateComparison(Parser.Operator operator, double left, double right) Evaluates a comparison
boolean	evaluateConstraints(Statistics strokeStatistic) Evaluates the constraints.
static double	evaluateFunction(org.ximtec.igesture.algorithm.siger.Parser.Tokens token, Statistics strokeStatistic) Evaluates the given function.
Pattern	getPattern() Returns the pattern.

Methods inherited from class java.lang.Object

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

Constructor Detail

Parser

public Parser(String expression)

Parses a string containing a description.

Parameters:

expression - the string to be parsed.

Method Detail

getPattern

public Pattern getPattern()

Returns the pattern.

Returns:

the pattern.

evaluateConstraints

public boolean evaluateConstraints(Statistics strokeStatistic)

Evaluates the constraints.

Parameters:

strokeStatistic - the stroke statistics.

Returns:

true if the constraint is satisfied.

evaluateFunction

public static double evaluateFunction(org.ximtec.igesture.algorithm.siger.Parser.Tokens token,
                                      Statistics strokeStatistic)

Evaluates the given function.

Parameters:

token - the token to be used.

strokeStatistic - the statistics to be used.

Returns:

the function's result.

evaluateComparison

public static boolean evaluateComparison(Parser.Operator operator,
                                         double left,
                                         double right)

Evaluates a comparison

Parameters:

operator - the comparison operator.

left - the value of the left operand.

right - the value of the right operand.

Returns:

true if the condition defined by the operator is true.