1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
|
/*******************************************************************************
* Copyright (c) 2009 Oracle. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0, which accompanies this distribution
* and is available at http://www.eclipse.org/legal/epl-v10.html.
*
* Contributors:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.common.utility.internal;
/**
* Assorted "Capital-B Boolean" operations.
*/
// commented code is just playing around with building *everything* from NAND
public final class BooleanTools {
/**
* Return the NOT of the specified Boolean.
* Boolean#not()
*/
public static Boolean not(Boolean b) {
return Boolean.valueOf( ! b.booleanValue());
// return nand(b, b);
}
/**
* Return the AND of the specified Booleans.
* Boolean#and(Boolean)
*/
public static Boolean and(Boolean b1, Boolean b2) {
return Boolean.valueOf(b1.booleanValue() && b2.booleanValue());
// Boolean nand = nand(b1, b2);
// return nand(nand, nand);
}
/**
* Return the OR of the specified Booleans.
* Boolean#or(Boolean)
*/
public static Boolean or(Boolean b1, Boolean b2) {
return Boolean.valueOf(b1.booleanValue() || b2.booleanValue());
// Boolean nand = nand(b1, b2);
// Boolean xor = nand(nand(b1, nand), nand(b2, nand));
// Boolean and = nand(nand, nand);
// Boolean nand2 = nand(xor, and);
// return nand(nand(xor, nand2), nand(and, nand2));
}
/**
* Return the XOR of the specified Booleans.
* Boolean#xor(Boolean)
*/
public static Boolean xor(Boolean b1, Boolean b2) {
return and(or(b1, b2), nand(b1, b2));
// Boolean nand = nand(b1, b2);
// return nand(nand(b1, nand), nand(b2, nand));
}
/**
* Return the NAND of the specified Booleans.
* Boolean#nand(Boolean)
*/
public static Boolean nand(Boolean b1, Boolean b2) {
return not(and(b1, b2));
// return Boolean.valueOf( ! (b1.booleanValue() && b2.booleanValue()));
}
/**
* Return the NOR of the specified Booleans.
* Boolean#nor(Boolean)
*/
public static Boolean nor(Boolean b1, Boolean b2) {
return not(or(b1, b2));
// Boolean nand = nand(b1, b2);
// Boolean xor = nand(nand(b1, nand), nand(b2, nand));
// Boolean and = nand(nand, nand);
// Boolean nand2 = nand(xor, and);
// Boolean nand3 = nand(nand(xor, nand2), nand(and, nand2));
// return nand(nand3, nand3);
}
/**
* Return the XNOR of the specified Booleans.
* Boolean#xnor(Boolean)
*/
public static Boolean xnor(Boolean b1, Boolean b2) {
return not(xor(b1, b2));
// Boolean nand = nand(b1, b2);
// Boolean xor = nand(nand(b1, nand), nand(b2, nand));
// return nand(xor, xor);
}
// ********** constructor **********
/**
* Suppress default constructor, ensuring non-instantiability.
*/
private BooleanTools() {
super();
throw new UnsupportedOperationException();
}
}
|
