local.tomas.expr
Class NumberConstant

java.lang.Object
  local.tomas.expr.NumberConstant

All Implemented Interfaces:

Serializable, Constant, Expression

Direct Known Subclasses:

DoubleConstant, IntegerConstant

public abstract class NumberConstant
extends Object
implements Constant

Base class for all numeric constant expressions.

Author:

Teubner

See Also:

Serialized Form

Field Summary

protected Number

value Numeric value.

Constructor Summary

protected	NumberConstant() Default constructor
protected	NumberConstant(Number value) Constructor using value

Method Summary

boolean	equals(Object obj) Compares this object against the specified object.
<E,F> E	greet(ExpressionWalker<E,F> visitor, F arg) Handle visit of ExpressionWalker.
int	hashCode()
void	setValue(Number value) Set constant value.
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

value

protected Number value

Numeric value.

Constructor Detail

NumberConstant

protected NumberConstant()

Default constructor

NumberConstant

protected NumberConstant(Number value)

Constructor using value

Parameters:

value - constant value

Method Detail

setValue

public void setValue(Number value)

Set constant value.

Parameters:

value - constant value.

greet

public <E,F> E greet(ExpressionWalker<E,F> visitor,
                     F arg)
        throws ExpressionException

Description copied from interface: Expression

Handle visit of ExpressionWalker.

Specified by:

greet in interface Expression

Parameters:

visitor - the ExpressionWalker visiting this object

arg - implementation dependent argument

Returns:

implementation dependent result

Throws:

ExpressionException

toString

public String toString()

Overrides:

toString in class Object

equals

public boolean equals(Object obj)

Compares this object against the specified object. The result is true if and only if the argument is not null and is a NumberConstant object with equal value as this object.

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object