|
1 package gnu.mapping;
2
3 public abstract class PropertySet implements Named
4 {
5
6 private Object  [] properties;
7
8 private static final String nameKey = "name";
9
10 public String getName()
11 {
12 Object symbol = getProperty(nameKey, null);
13 return symbol == null ? null
14 : symbol instanceof Symbol ? ((Symbol) symbol).getName()
15 : symbol.toString();
16 }
17
18 public Object getSymbol()
19 {
20 return getProperty(nameKey, null);
21 }
22
23 public final void setSymbol (Object name)
24 {
25 setProperty(nameKey, name);
26 }
27
28 public final void setName (String name)
29 {
30 setProperty(nameKey, name);
31 }
32
33 public Object getProperty(Object key, Object defaultValue)
34 {
35 if (properties != null)
36 {
37 for (int i = properties.length; (i -= 2) >= 0; )
38 {
39 if (properties[i] == key)
40 return properties[i + 1];
41 }
42 }
43 return defaultValue;
44 }
45
46 public synchronized void setProperty(Object key, Object value)
47 {
48 properties = PropertySet.setProperty(properties, key, value);
49 }
50
51
57 public static Object [] setProperty(Object [] properties,
58 Object key, Object value)
59 {
60 int avail;
61 Object [] props = properties;
62 if (props == null)
63 {
64 properties = props = new Object [10];
65 avail = 0;
66 }
67 else
68 {
69 avail = -1;
70 for (int i = props.length; (i -= 2) >= 0; )
71 {
72 Object k = props[i];
73 if (k == key)
74 {
75 Object old = props[i + 1];
76 props[i + 1] = value;
77 return properties;
78 }
79 else if (k == null)
80 avail = i;
81 }
82 if (avail < 0)
83 {
84 avail = props.length;
85 properties = new Object [2 * avail];
86 System.arraycopy(props, 0, properties, 0, avail);
87 props = properties;
88 }
89 }
90 props[avail] = key;
91 props[avail+1] = value;
92 return properties;
93 }
94
95 public Object removeProperty(Object key)
96 {
97 Object [] props = properties;
98 if (props == null)
99 return null;
100 for (int i = props.length; (i -= 2) >= 0; )
101 {
102 Object k = props[i];
103 if (k == key)
104 {
105 Object old = props[i + 1];
106 props[i] = null;
107 props[i + 1] = null;
108 return old;
109 }
110 }
111 return null;
112 }
113 }
114 |
Popular Tags |
Java API By Example, From Geeks To Geeks.