local.tomas.expr
Class BooleanConstant

java.lang.Object
  local.tomas.expr.BooleanConstant

All Implemented Interfaces:

Serializable, Constant, Expression

public class BooleanConstant
extends Object
implements Constant

Definition of boolean constant expression.

Author:

Teubner

See Also:

Serialized Form

Field Summary

static BooleanConstant	FALSE Constant value false.
static BooleanConstant	TRUE Constant value true.

Constructor Summary

BooleanConstant()
Default constructor.

Method Summary

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

Methods inherited from class java.lang.Object

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

Field Detail

FALSE

public static final BooleanConstant FALSE

Constant value false.

TRUE

public static final BooleanConstant TRUE

Constant value true.

Constructor Detail

BooleanConstant

public BooleanConstant()

Default constructor.

Method Detail

getInstance

public static BooleanConstant getInstance(boolean value)

Return boolean constant.

Parameters:

value - value of constant

Returns:

the constant

getValue

public Boolean getValue()

Get value.

Returns:

value.

setValue

public void setValue(Boolean value)

Set value.

Parameters:

value - boolean 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 BooleanConstant object with equal value as this object.

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object