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1
4 package gnu.mapping;
5
6
7
8 public abstract class NamedLocation extends IndirectableLocation
9 implements
10
11 java.util.Map.Entry ,
12
13 EnvironmentKey
14 {
15 NamedLocation next;
16
17 public boolean entered ()
18 {
19 return next != null;
20 }
21
22 public Environment getEnvironment ()
23 {
24 for (NamedLocation loc = this; loc != null; loc = loc.next)
25 {
26 if (loc.name == null)
27 {
28 Environment env = (Environment) loc.value;
29 if (env != null)
30 return env;
31 }
32 }
33 return super.getEnvironment();
34 }
35
36 final Symbol name;
37 final Object  property;
38
39 public NamedLocation (NamedLocation loc)
40 {
41 name = loc.name;
42 property = loc.property;
43 }
44
45 public NamedLocation (Symbol name, Object property)
46 {
47 this.name = name;
48 this.property = property;
49 }
50
51 public final Symbol getKeySymbol ()
52 {
53 return name;
54 }
55
56 public final Object getKeyProperty ()
57 {
58 return property;
59 }
60
61 public final boolean matches (EnvironmentKey key)
62 {
63 return Symbol.equals(key.getKeySymbol(), this.name)
64 && key.getKeyProperty() == this.property;
65 }
66
67 public final boolean matches (Symbol symbol, Object property)
68 {
69 return Symbol.equals(symbol, this.name) && property == this.property;
70 }
71
72 public final Object getKey ()
73 {
74 if (property == null)
75 return name;
76 else
77 return this;
78 }
79
80 public boolean equals (Object x)
81 {
82 if (! (x instanceof NamedLocation))
83 return false;
84 NamedLocation e2 = (NamedLocation) x;
85 if (name == null ? e2.name != null : ! name.equals(e2.name))
86 return false;
87 if (property != e2.property)
88 return false;
89 Object val1 = getValue();
90 Object val2 = e2.getValue();
91 if (val1 == val2)
92 return true;
93 if (val1 == null || val2 == null)
94 return false;
95 return val1.equals(val2);
96 }
97
98 public int hashCode ()
99 {
100 int h = name.hashCode() ^ System.identityHashCode(property);
101 Object val = getValue();
102 if (val != null)
103 h ^= val.hashCode();
104 return h;
105 }
106
107 public synchronized Object setWithSave (Object newValue, CallContext ctx)
108 {
109 Object old;
110 if (base != null)
111 {
112 if (value == INDIRECT_FLUIDS)
113 return base.setWithSave(newValue, ctx);
114 old = base;
115 base = null;
116 }
117 else
118 {
119 old = value;
120 }
121 value = newValue;
122 ctx.pushFluid(this);
123 return old;
124 }
125
126 public synchronized void setRestore (Object oldValue, CallContext ctx)
127 {
128 if (value == INDIRECT_FLUIDS)
129 base.setRestore(oldValue, ctx);
130 else
131 {
132 if (oldValue instanceof Location)
133 {
134 value = null;
135 base = (Location) oldValue;
136 }
137 else
138 {
139 value = oldValue;
140 base = null;
141 }
142 ctx.popFluid();
143 }
144 }
145 }
146 |
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