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comparison src/main/java/fj/test/Bool.java @ 0:fe80c1edf1be

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add getLoop
author tatsuki
date Fri, 20 Mar 2015 21:04:03 +0900
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-1:000000000000 0:fe80c1edf1be
1 package fj.test;
2
3 import fj.P1;
4 import static fj.test.Property.prop;
5
6 /**
7 * A boolean wrapper that works well with properties.
8 *
9 * @version %build.number%
10 */
11 public final class Bool {
12 private final boolean b;
13
14 private static final Bool t = new Bool(true);
15 private static final Bool f = new Bool(false);
16
17 private Bool(final boolean b) {
18 this.b = b;
19 }
20
21 /**
22 * Returns <code>true</code> if this value is true, <code>false</code> otherwise.
23 *
24 * @return <code>true</code> if this value is true, <code>false</code> otherwise.
25 */
26 public boolean is() {
27 return b;
28 }
29
30 /**
31 * Returns <code>false</code> if this value is true, <code>true</code> otherwise.
32 *
33 * @return <code>false</code> if this value is true, <code>true</code> otherwise.
34 */
35 public boolean isNot() {
36 return !b;
37 }
38
39 /**
40 * Returns a property that produces a result only if this value is true. The result will be taken
41 * from the given property.
42 *
43 * @param p The property to return if this value is true.
44 * @return a property that produces a result only if this value is true.
45 */
46 public Property implies(final P1<Property> p) {
47 return Property.implies(b, p);
48 }
49
50 /**
51 * Returns a property that produces a result only if this value is true. The result will be taken
52 * from the given property.
53 *
54 * @param p The property to return if this value is true.
55 * @return a property that produces a result only if this value is true.
56 */
57 public Property implies(final Property p) {
58 return Property.implies(b, new P1<Property>() {
59 public Property _1() {
60 return p;
61 }
62 });
63 }
64
65 /**
66 * Returns a property that produces a result only if this value is true.
67 *
68 * @param c The value to construct a property with to return if this value is true.
69 * @return a property that produces a result only if this value is true.
70 */
71 public Property implies(final Bool c) {
72 return implies(prop(c.b));
73 }
74
75 /**
76 * Returns a property that produces a result only if this value is true.
77 *
78 * @param c The value to construct a property with to return if this value is true.
79 * @return a property that produces a result only if this value is true.
80 */
81 public Property implies(final boolean c) {
82 return Property.implies(b, new P1<Property>() {
83 public Property _1() {
84 return prop(c);
85 }
86 });
87 }
88
89 /**
90 * Construct a <code>Bool</code> from the given value.
91 *
92 * @param b The value to construct a <code>Bool</code> with.
93 * @return A <code>Bool</code> from the given value.
94 */
95 public static Bool bool(final boolean b) {
96 return b ? t : f;
97 }
98 }