ReadOnlyLocation


1   // Copyright (c) 2005  Per M.A. Bothner.
2   // This is free software;  for terms and warranty disclaimer see ./COPYING.
3   
4   package gnu.mapping;
5   
6   public class ReadOnlyLocation extends ConstrainedLocation
7   {
8     public static ReadOnlyLocation make (Location base)
9     {
10      ReadOnlyLocation rloc = new ReadOnlyLocation();
11      rloc.base = base;
12      return rloc;
13    }
14  
15    public boolean isConstant ()
16    {
17      return true;
18    }
19  
20    protected Object   coerce (Object   newValue)
21    {
22      StringBuffer   sbuf
23        = new StringBuffer  ("attempt to modify read-only location");
24      Symbol name = getKeySymbol();
25      if (name != null)
26        {
27      sbuf.append(": ");
28      sbuf.append(name);
29        }
30      throw new IllegalStateException  (sbuf.toString());
31    }
32  
33  }
34

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