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1 package gnu.expr;
2 import gnu.mapping.*;
3
4
7
8 public class BuiltinEnvironment extends Environment
9 {
10 static final BuiltinEnvironment instance = new BuiltinEnvironment();
11 static { instance.setName("language-builtins"); }
12
13 public static BuiltinEnvironment getInstance() { return instance; }
14
15 public Environment getLangEnvironment ()
16 {
17 Language lang = Language.getDefaultLanguage();
18 return lang == null ? null : lang.getLangEnvironment();
19 }
20
21 public NamedLocation lookup (Symbol name, Object  property, int hash)
22 {
23 if (property == ThreadLocation.ANONYMOUS)
24 return null;
25 Language lang = Language.getDefaultLanguage();
26 return lang == null ? null : lang.lookupBuiltin(name, property, hash);
27 }
28
29 public NamedLocation getLocation (Symbol key, Object property,
30 int hash, boolean create)
31 {
32 throw new RuntimeException ();
33 }
34
35 public void define (Symbol key, Object property, Object newValue)
36 {
37 throw new RuntimeException ();
38 }
39
40 public LocationEnumeration enumerateLocations ()
41 {
42 return getLangEnvironment().enumerateLocations();
43 }
44
45 public LocationEnumeration enumerateAllLocations ()
46 {
47 return getLangEnvironment().enumerateLocations();
48 }
49
50 protected boolean hasMoreElements (LocationEnumeration it)
51 {
52 throw new RuntimeException ();
53 }
54
55 public NamedLocation addLocation (Symbol name, Object prop, Location loc)
56 {
57 throw new RuntimeException ();
58 }
59 }
60 |
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