com.fathzer.soft.javaluator.examples

Class BooleanSetEvaluator

java.lang.Object

com.fathzer.soft.javaluator.AbstractEvaluator<BitSet>

com.fathzer.soft.javaluator.examples.BooleanSetEvaluator

public class BooleanSetEvaluator
extends com.fathzer.soft.javaluator.AbstractEvaluator<BitSet>

An example of how to implement an evaluator from scratch, working on something more complex than doubles.
This evaluator computes expressions that use boolean sets.
A boolean set is a vector of booleans. A true is represented by a one, a false, by a zero. For instance "01" means {false, true}
The evaluator uses the BitSet java class to represent these vectors.
It supports the logical OR (+), AND (*) and NEGATE (-) operators.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	BooleanSetEvaluator.BitSetEvaluationContext

Field Summary

Fields

Modifier and Type	Field and Description
static com.fathzer.soft.javaluator.Constant	FALSE The false constant.
static com.fathzer.soft.javaluator.Operator	NEGATE The negate unary operator.
static com.fathzer.soft.javaluator.Operator	OR The logical OR operator.
static com.fathzer.soft.javaluator.Constant	TRUE The true constant.

Constructor Summary

Constructors

Constructor and Description
BooleanSetEvaluator() Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
protected BitSet	evaluate(com.fathzer.soft.javaluator.Constant constant, Object evaluationContext)
protected BitSet	evaluate(com.fathzer.soft.javaluator.Operator operator, Iterator<BitSet> operands, Object evaluationContext)
static void	main(String[] args) A simple program using this evaluator.
static String	toBinaryString(BitSet bitSet) Converts a bitSet to its binary representation.
protected BitSet	toValue(String literal, Object evaluationContext)

Methods inherited from class com.fathzer.soft.javaluator.AbstractEvaluator

evaluate, evaluate, evaluate, getConstants, getFunctions, getOperators, guessOperator, tokenize, validateHomonyms

Methods inherited from class java.lang.Object

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

Field Detail

NEGATE

public static final com.fathzer.soft.javaluator.Operator NEGATE

The negate unary operator.

OR

public static final com.fathzer.soft.javaluator.Operator OR

The logical OR operator.

TRUE

public static final com.fathzer.soft.javaluator.Constant TRUE

The true constant.

FALSE

public static final com.fathzer.soft.javaluator.Constant FALSE

The false constant.

Constructor Detail

BooleanSetEvaluator

public BooleanSetEvaluator()

Constructor.

Method Detail

toValue

protected BitSet toValue(String literal,
             Object evaluationContext)

Specified by:

toValue in class com.fathzer.soft.javaluator.AbstractEvaluator<BitSet>

evaluate

protected BitSet evaluate(com.fathzer.soft.javaluator.Operator operator,
              Iterator<BitSet> operands,
              Object evaluationContext)

Overrides:

evaluate in class com.fathzer.soft.javaluator.AbstractEvaluator<BitSet>

evaluate

protected BitSet evaluate(com.fathzer.soft.javaluator.Constant constant,
              Object evaluationContext)

Overrides:

evaluate in class com.fathzer.soft.javaluator.AbstractEvaluator<BitSet>

main

public static void main(String[] args)

A simple program using this evaluator.

toBinaryString

public static String toBinaryString(BitSet bitSet)

Converts a bitSet to its binary representation.

Parameters:

bitSet - A bit set

Returns:

a String composed of 0 and 1. 1 indicates that the corresponding bit is set.