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Interface ExpressionNode

All Known Implementing Classes:

AdditionExpressionNode, ConstantExpressionNode, ExponentiationExpressionNode, FunctionExpressionNode, MultiplicationExpressionNode, SequenceExpressionNode, VariableExpressionNode

public interface ExpressionNode

An interface for expression nodes. Every concrete type of expression node has to implement this interface.

Field Summary

Fields

Modifier and Type	Field and Description
static int	ADDITION_NODE Node id for addition nodes
static int	CONSTANT_NODE Node id for constant nodes
static int	EXPONENTIATION_NODE Node id for exponentiation nodes
static int	FUNCTION_NODE Node id for function nodes
static int	MULTIPLICATION_NODE Node id for multiplication nodes
static int	VARIABLE_NODE Node id for variable nodes

Method Summary

Modifier and Type	Method and Description
void	accept(ExpressionNodeVisitor visitor) Method needed for the visitor design pattern
int	getType() Returns the type of the node.ExpressionNode Each class derived from ExpressionNode representing a specific role in the expression should return the type according to that role.
double	getValue() Calculates and returns the value of the sub-expression represented by the node.

Field Detail

VARIABLE_NODE

static final int VARIABLE_NODE

Node id for variable nodes

See Also:

Constant Field Values

CONSTANT_NODE

static final int CONSTANT_NODE

Node id for constant nodes

See Also:

Constant Field Values

ADDITION_NODE

static final int ADDITION_NODE

Node id for addition nodes

See Also:

Constant Field Values

MULTIPLICATION_NODE

static final int MULTIPLICATION_NODE

Node id for multiplication nodes

See Also:

Constant Field Values

EXPONENTIATION_NODE

static final int EXPONENTIATION_NODE

Node id for exponentiation nodes

See Also:

Constant Field Values

FUNCTION_NODE

static final int FUNCTION_NODE

Node id for function nodes

See Also:

Constant Field Values

Method Detail

getType

int getType()

Returns the type of the node.ExpressionNode Each class derived from ExpressionNode representing a specific role in the expression should return the type according to that role.

Returns:

type of the node

getValue

double getValue()

Calculates and returns the value of the sub-expression represented by the node.

Returns:

value of expression

accept

void accept(ExpressionNodeVisitor visitor)

Method needed for the visitor design pattern

Parameters:

visitor - the visitor