01: /*=============================================================================
02: * Copyright Texas Instruments 2002. All Rights Reserved.
03: *
04: * This program is free software; you can redistribute it and/or modify
05: * it under the terms of the GNU General Public License as published by
06: * the Free Software Foundation; either version 2 of the License, or
07: * (at your option) any later version.
08: *
09: * This program is distributed in the hope that it will be useful,
10: * but WITHOUT ANY WARRANTY; without even the implied warranty of
11: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12: * GNU General Public License for more details.
13: *
14: * You should have received a copy of the GNU General Public License
15: * along with this program; if not, write to the Free Software
16: * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17: */
18:
19: package ti.chimera.registry;
20:
21: /**
22: * A {@link NodeContract} which will not allow the node's value to be changed.
23: * In other words, it accepts only the first value.
24: *
25: * @author ;Rob Clark;a0873619;San Diego;;
26: * @version 0.1
27: */
28: public class ImmutableNodeContract implements NodeContract {
29: private boolean first = true;
30:
31: /**
32: * Determine if the specified <code>value</code> meets this contract.
33: *
34: * @param value the value to check
35: * @return <code>true</code> if meets contract
36: */
37: public boolean accepts(Object value) {
38: boolean retval = first;
39: first = false;
40: return retval;
41: }
42:
43: /**
44: * The contract implementation should overload <code>toString</code> so
45: * the contract can be displayed to the user in a sane format, for use
46: * in error messages, etc.
47: */
48: public String toString() {
49: return "immutable";
50: }
51: }
52:
53: /*
54: * Local Variables:
55: * tab-width: 2
56: * indent-tabs-mode: nil
57: * mode: java
58: * c-indentation-style: java
59: * c-basic-offset: 2
60: * eval: (c-set-offset 'substatement-open '0)
61: * eval: (c-set-offset 'case-label '+)
62: * eval: (c-set-offset 'inclass '+)
63: * eval: (c-set-offset 'inline-open '0)
64: * End:
65: */
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