lab.art

Class BinaryExpression

java.lang.Object

lab.art.Expression

lab.art.BinaryExpression

Direct Known Subclasses:

Average, Product

public abstract class BinaryExpression
extends Expression

This class represents a binary expression.

Constructor Summary

Constructors

Constructor and Description
BinaryExpression(Expression first, Expression second) Initializes this binary expression with the given two subexpressions.

Method Summary

Methods

Modifier and Type	Method and Description
boolean	equals(Object object) Tests whether this binary expression is the same as the given object.
double	evaluate(double x, double y, BinaryOperator operator) Evaluates this binary expression at the given x- and y-coordinate with the given binary operator.
int	hashCode() Returns the hash code of this binary expression.
String	toString(String pattern) Returns a string representation of this binary expression for the given pattern.

Methods inherited from class lab.art.Expression

evaluate

Methods inherited from class java.lang.Object

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

Constructor Detail

BinaryExpression

public BinaryExpression(Expression first,
                Expression second)

Initializes this binary expression with the given two subexpressions.

Parameters:

first - the first subexpression.

second - the second subexpression.

Precondition:

first != null, second != null

Method Detail

equals

public boolean equals(Object object)

Tests whether this binary expression is the same as the given object. Two binary expressions are the same if their subexpressions are the same, that is, the first expression of the one is equal to the first expression of the other and the second expression of the one is equal to the second expression of the other, or the first expression of the one is equal to the second expression of the other and the second expression of the one is equal to the first expression of the other.

Overrides:

equals in class Object

Parameters:

object - an object.

Returns:

true if this binary expression is the same as the given object, false otherwise.

hashCode

public int hashCode()

Returns the hash code of this binary expression. The hash code of a binary expression is the sum of the hash codes of its subexpressions.

Overrides:

hashCode in class Object

Returns:

the hash code of this binary expression.

evaluate

public double evaluate(double x,
              double y,
              BinaryOperator operator)

Evaluates this binary expression at the given x- and y-coordinate with the given binary operator.

Parameters:

x - the x-coordinate.

y - the y-coordinate.

operator - a binary operator.

Precondition:

x >= -1 && x <= 1, y >= -1 && y <= 1, operator != null

Returns:

the value of this binary expression at the given x- and y-coordinate with the given binary operator.

toString

public String toString(String pattern)

Returns a string representation of this binary expression for the given pattern.

Parameters:

pattern - the pattern describing how the two subexpressions should be combined.

Precondition:

pattern contains %s twice

Returns:

a string representation of this binary expression for the given pattern.