oracle.ide.util

Class TriStateBoolean

java.lang.Object

oracle.ide.util.TriStateBoolean

public class TriStateBoolean
extends java.lang.Object

This class represents a flag that has three states, as opposed to the two states of a regular boolean flag. Support for basic Boolean operations (NOT, AND, and OR) are provided.

Field Summary

Fields

Modifier and Type	Field and Description
static TriStateBoolean	FALSE FALSE corresponds to a typical Boolean FALSE.
static TriStateBoolean	TRI_STATE TRI_STATE represents the tri-state.
static TriStateBoolean	TRUE TRUE corresponds to a typical Boolean true.
static TriStateBoolean	UNDEF Special TriStateBoolean object representing an uninitialized value.

Method Summary

Methods

Modifier and Type	Method and Description
TriStateBoolean	aggregate(TriStateBoolean b) This method is used to help determine if a set of TriStateBoolean values are all the same or have some difference.
TriStateBoolean	and(TriStateBoolean b) AND true false tri true true false tri false false false tri tri tri tri tri Field Detail TRUE public static final TriStateBoolean TRUE TRUE corresponds to a typical Boolean true. TRI_STATE public static final TriStateBoolean TRI_STATE TRI_STATE represents the tri-state. FALSE public static final TriStateBoolean FALSE FALSE corresponds to a typical Boolean FALSE. UNDEF public static final TriStateBoolean UNDEF Special TriStateBoolean object representing an uninitialized value. This is needed to support the aggregate() operation. Using the UNDEF value is analogous to saying "no value". When UNDEF is used in a TriStateBoolean operation, it is essentially ignored, the result of the operation is determined by the other operand. If both operands are UNDEF then UNDEF is returned. Method Detail getState public static TriStateBoolean getState(boolean state) getState public static TriStateBoolean getState(java.lang.Boolean state) isTrue public boolean isTrue() Returns true if this instance represents TRUE; returns false otherwise. isTriState public boolean isTriState() Returns true if this instance represents TRI_STATE; returns false otherwise. isFalse public boolean isFalse() Returns true if this instance represents FALSE; returns false otherwise. isUndef public boolean isUndef() Returns true if this instance represents UNDEF; returns false otherwise. booleanValue public boolean booleanValue() Returns true if this instance represents TRUE. Returns false if this instance represents false. Throws an IllegalStateException if this instance represents TRI_STATE. toggle public TriStateBoolean toggle() This method defines the "toggle" operation as follows: Toggling TRUE returns FALSE. Toggling TRI_STATE returns FALSE. Toggling FALSE returns TRUE. aggregate public TriStateBoolean aggregate(TriStateBoolean b) This method is used to help determine if a set of TriStateBoolean values are all the same or have some difference. It implements the following unusual truth table: Truth table for tri-state AND operator AGG true false tri true true tri tri false tri false tri tri tri tri tri and public TriStateBoolean and(TriStateBoolean b) Truth table for tri-state AND operator AND true false tri true true false tri false false false tri tri tri tri tri or public TriStateBoolean or(TriStateBoolean b) Truth table for tri-state OR operator OR true false tri true true true tri false true false tri tri tri tri tri not public TriStateBoolean not() NOT true => false. NOT false => true. NOT tri => tri. toString public java.lang.String toString() Overrides: toString in class java.lang.Object Overview Package Class Use Tree Deprecated Index Help Oracle Fusion Middleware Java API Reference for Oracle Extension SDK 12c (12.1.2) E23196-02 Prev Class Next Class Frames No Frames All Classes Summary: Nested | Field | Constr | Method Detail: Field | Constr | Method Copyright © 1997, 2013, Oracle. All rights reserved. Truth table for tri-state AND operator boolean booleanValue() Returns true if this instance represents TRUE. static TriStateBoolean getState(boolean state) static TriStateBoolean getState(java.lang.Boolean state) boolean isFalse() Returns true if this instance represents FALSE; returns false otherwise. boolean isTriState() Returns true if this instance represents TRI_STATE; returns false otherwise. boolean isTrue() Returns true if this instance represents TRUE; returns false otherwise. boolean isUndef() Returns true if this instance represents UNDEF; returns false otherwise. TriStateBoolean not() NOT true => false. NOT false => true. NOT tri => tri. TriStateBoolean or(TriStateBoolean b) OR true false tri true true true tri false true false tri tri tri tri tri Truth table for tri-state OR operator TriStateBoolean toggle() This method defines the "toggle" operation as follows: Toggling TRUE returns FALSE. java.lang.String toString() Methods inherited from class java.lang.Object clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait