Source Code Cross Referenced for BooleanComparator.java in  » Swing-Library » jide-common » com » jidesoft » comparator » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Swing Library » jide common » com.jidesoft.comparator 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        package com.jidesoft.comparator;
02:
03:        import java.util.Comparator;
04:
05:        /**
06:         * Comparator for boolean type. This is a singleton class. Call getInstance() to
07:         * get the comparator.
08:         */
09:        public class BooleanComparator implements  Comparator {
10:            private static BooleanComparator singleton = null;
11:
12:            /**
13:             * Constructor.
14:             * <p/>
15:             * Has protected access to prevent other clients creating instances of the
16:             * class ... it is stateless so we need only one instance.
17:             */
18:            protected BooleanComparator() {
19:            }
20:
21:            /**
22:             * Returns <tt>BooleanComparator</tt> singleton.
23:             *
24:             * @return an instance of BooleanComparator.
25:             */
26:            public static BooleanComparator getInstance() {
27:                if (singleton == null)
28:                    singleton = new BooleanComparator();
29:                return singleton;
30:            }
31:
32:            /**
33:             * Compares two <tt>Boolean</tt>s. False is treated as being less than True.
34:             *
35:             * @param o1 the first object to be compared
36:             * @param o2 the second object to be compared
37:             * @return 0 if a and b are equal, -1 if a is less than b, 1 if a is more than b
38:             */
39:            public int compare(Object o1, Object o2) {
40:                if (o1 == null && o2 == null) {
41:                    return 0;
42:                } else if (o1 == null) {
43:                    return -1;
44:                } else if (o2 == null) {
45:                    return 1;
46:                }
47:
48:                if (o1 instanceof  Boolean) {
49:                    if (o2 instanceof  Boolean) {
50:                        final boolean b1 = (Boolean) o1;
51:                        final boolean b2 = (Boolean) o2;
52:
53:                        if (b1 == b2)
54:                            return 0;
55:                        else if (b1) // Define false < true
56:                            return 1;
57:                        else
58:                            return -1;
59:                    } else {
60:                        // o2 wasn't comparable
61:                        throw new ClassCastException(
62:                                "The first argument of this method was not a Boolean but "
63:                                        + o2.getClass().getName());
64:                    }
65:                } else if (o2 instanceof  Boolean) {
66:                    // o1 wasn't comparable
67:                    throw new ClassCastException(
68:                            "The second argument of this method was not a Boolean but "
69:                                    + o1.getClass().getName());
70:                } else {
71:                    // neither were comparable
72:                    throw new ClassCastException(
73:                            "Both arguments of this method were not Booleans. They are "
74:                                    + o1.getClass().getName() + " and "
75:                                    + o2.getClass().getName());
76:                }
77:            }
78:        }
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