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Class w3c.www.dsig.Trivalue

java.lang.Object
   |
   +----w3c.www.dsig.Trivalue

public final class Trivalue

extends Object

TRI_FALSE

Int value defined to indicate the state false.

TRI_TRUE

Int value defined to indicate the state true.

TRI_UNKNOWN

Int value defined to indicate the state unknown.

Trivalue(boolean)

Construct a trivalue from the given int.

Trivalue(int)

Construct a trivalue from the given int.

Trivalue(String)

Construct a trivalue from the given string.

and(Trivalue)

Return the logic and of this trivalue and the given trivalue in trivalued logic.

equals(Object)

Test this trivalue and the given object for equality.

getValue()

Return the trivalue as an int.

hashCode()

Return a hash code for this trivalue.

isFalse()

Return the boolean true if this trivalue is false.

isTrue()

Return the boolean true if this trivalue is true.

isUnknown()

Return the boolean true if this trivalue is unknown.

newFalse()

Return a trivalue with the state true.

newTrue()

Return a trivalue with the state true.

newUnknown()

Return a trivalue with the state true.

not()

Return the logic not of this trivalue in trivalued logic.

or(Trivalue)

Return the logic and of this trivalue and the given trivalue in trivalued logic.

toString()

Return a string representation of this trivalue.

toTrivalue(String)

Return a trivalue encoded in an int for the string value.

UnknownToFalse()

'Convert' the Trivalue to boolean treating unknown as false.

UnknownToTrue()

'Convert' the Trivalue to boolean treating unknown as true.

 public static final int TRI_FALSE

Int value defined to indicate the state false.

 public static final int TRI_TRUE

Int value defined to indicate the state true.

 public static final int TRI_UNKNOWN

Int value defined to indicate the state unknown.

 public Trivalue(int value)

Construct a trivalue from the given int. The constants defined in this class for the int are TRI_FALSE, TRI_TRUE, and TRI_UNKNOWN. TRI_UNKNOWN and any other value will a trivalue with the state unknown.

 public Trivalue(boolean value)

Construct a trivalue from the given int. Of course, this will never lead to a trivalue with the value unknown.

 public Trivalue(String value)

Construct a trivalue from the given string. The string "true" is mapped to true, "false" to false, all else to unknown.

 public static Trivalue newTrue()

Return a trivalue with the state true. This method can be used as a short hand for 'new Trivalue(Trivalue.TRI_TRUE).' Additionally, it is more efficient as no new object needs to be generated.

 public static Trivalue newFalse()

Return a trivalue with the state true. This method can be used as a short hand for 'new Trivalue(Trivalue.TRI_FALSE).' Additionally, it is more efficient as no new object needs to be generated.

 public static Trivalue newUnknown()

Return a trivalue with the state true. This method can be used as a short hand for 'new Trivalue(Trivalue.TRI_UNKNOWN).' Additionally, it is more efficient as no new object needs to be generated.

 public int toTrivalue(String value)

Return a trivalue encoded in an int for the string value. The string "true" maps to true, "false" to false, all else to unknown.

 public int getValue()

Return the trivalue as an int. Possible values for the int are the final variables TRI_TRUE, TRI_FALSE, and TRI_UNKNOWN defined in this class.

 public boolean isTrue()

Return the boolean true if this trivalue is true.

 public boolean isFalse()

Return the boolean true if this trivalue is false.

 public boolean isUnknown()

Return the boolean true if this trivalue is unknown.

 public boolean UnknownToTrue()

'Convert' the Trivalue to boolean treating unknown as true. That is, return true if this trivalue is true or unknown, and false if it is false.

 public boolean UnknownToFalse()

'Convert' the Trivalue to boolean treating unknown as false. That is, return true is this trivalue is true, and false if it is unknown or false.

 public Trivalue not()

Return the logic not of this trivalue in trivalued logic. true maps to false, false to true, and unknown to unknown.

 public Trivalue and(Trivalue tvalue)

Return the logic and of this trivalue and the given trivalue in trivalued logic. That is, return false if any of the two is false, true if both are true, and unknown otherwise.

 public Trivalue or(Trivalue tvalue)

Return the logic and of this trivalue and the given trivalue in trivalued logic. That is, return true if any of the two are true, false if both are false, and unknown otherwise.

 public boolean equals(Object obj)

Test this trivalue and the given object for equality. If the given object is not null, an instance of the trivalue class and it represents the same logic state, return true. Otherwise return false.

Overrides:

equals in class Object

 public int hashCode()

Return a hash code for this trivalue. Using trivalues as keys in a hashtable does not make much sense as there are only three distinct ones, but this method is included anyway just in case someone needs it.

Overrides:

hashCode in class Object

 public String toString()

Return a string representation of this trivalue. The state true is represented by the string "true", false by "false," and unknown by "unknown."

Overrides:

toString in class Object

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