com.fathzer.soft.javaluator

Class Operator

java.lang.Object

com.fathzer.soft.javaluator.Operator

public class Operator
extends Object

An operator.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Operator.Associativity An Operator's associativity.

Constructor Summary

Constructors

Constructor and Description
Operator(String symbol, int operandCount, Operator.Associativity associativity, int precedence) Constructor.

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object obj)
Operator.Associativity	getAssociativity() Gets this operator's associativity.
int	getOperandCount() Gets the operator's operand count.
int	getPrecedence() Gets the operator's precedence.
String	getSymbol() Gets the operator's symbol.
int	hashCode()

Methods inherited from class java.lang.Object

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

Constructor Detail

Operator

public Operator(String symbol,
                int operandCount,
                Operator.Associativity associativity,
                int precedence)

Constructor.

Parameters:

symbol - The operator name (Currently, the name's length must be one character).

operandCount - The number of operands of the operator (must be 1 or 2).

associativity - The associativity of the operator.

precedence - The precedence of the operator.
The precedence is the priority of the operator. An operator with an higher precedence will be executed before an operator with a lower precedence. Example : In "1+3*4" * has a higher precedence than +, so the expression is interpreted as 1+(3*4).

Throws:

IllegalArgumentException - if operandCount if not 1 or 2, or if associativity is Operator.Associativity.NONE or null, or if symbol is null, empty or starts/ends with a space character.

Method Detail

getSymbol

public String getSymbol()

Gets the operator's symbol.

Returns:

a String

getOperandCount

public int getOperandCount()

Gets the operator's operand count.

Returns:

an integer

getAssociativity

public Operator.Associativity getAssociativity()

Gets this operator's associativity.

Returns:

true if the operator is left associative.

See Also:

Operator's associativity in Wikipedia

getPrecedence

public int getPrecedence()

Gets the operator's precedence.

Returns:

an integer

See Also:

Operator's associativity in Wikipedia

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object