opendial.bn.values

Class NoneVal

java.lang.Object

opendial.bn.values.NoneVal

All Implemented Interfaces:

java.lang.Comparable<Value>, Value

public final class NoneVal
extends java.lang.Object
implements Value

"None" value (describing the lack of value, or an empty assignment)

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	NoneVal() Creates the none value (protected, use the value factory)

Method Summary

Modifier and Type	Method and Description
int	compareTo(Value o) Compares the none value to another value
Value	concatenate(Value v) Returns the value v provided as argument.
boolean	contains(Value subvalue) True if subvalue is contained in the current instance, and false otherwise
NoneVal	copy() Returns its own instance
boolean	equals(java.lang.Object o) Returns true if both values are none
java.util.Collection<Value>	getSubValues() Returns an empty list
int	hashCode() Returns a hashcode for the value
int	length() Returns 0
java.lang.String	toString() Returns the string "None

Methods inherited from class java.lang.Object

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

Constructor Detail

NoneVal

protected NoneVal()

Creates the none value (protected, use the value factory)

Method Detail

hashCode

public int hashCode()

Returns a hashcode for the value

Specified by:

hashCode in interface Value

Overrides:

hashCode in class java.lang.Object

Returns:

the hashcode

equals

public boolean equals(java.lang.Object o)

Returns true if both values are none

Specified by:

equals in interface Value

Overrides:

equals in class java.lang.Object

Parameters:

o - the object

Returns:

true if equals, false otherwise

copy

public NoneVal copy()

Returns its own instance

Specified by:

copy in interface Value

Returns:

its own instance

concatenate

public Value concatenate(Value v)

Returns the value v provided as argument.

Specified by:

concatenate in interface Value

Parameters:

v - the value to concatenate with the current one

Returns:

the concatenated result

toString

public java.lang.String toString()

Returns the string "None

Specified by:

toString in interface Value

Overrides:

toString in class java.lang.Object

Returns:

the string

compareTo

public int compareTo(Value o)

Compares the none value to another value

Specified by:

compareTo in interface java.lang.Comparable<Value>

Returns:

hashcode difference

length

public int length()

Returns 0

Specified by:

length in interface Value

Returns:

0

contains

public boolean contains(Value subvalue)

True if subvalue is contained in the current instance, and false otherwise

Specified by:

contains in interface Value

Parameters:

subvalue - the possibly contained value

Returns:

true if contained, false otherwise

getSubValues

public java.util.Collection<Value> getSubValues()

Returns an empty list

Specified by:

getSubValues in interface Value

Returns:

the collection of values inside the present value