01: /*
02: * <copyright>
03: *
04: * Copyright 2001-2007 BBNT Solutions, LLC
05: * under sponsorship of the Defense Advanced Research Projects
06: * Agency (DARPA).
07: *
08: * You can redistribute this software and/or modify it under the
09: * terms of the Cougaar Open Source License as published on the
10: * Cougaar Open Source Website (www.cougaar.org).
11: *
12: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
13: * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
14: * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
15: * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
16: * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
17: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
18: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
19: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
20: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
22: * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23: *
24: * </copyright>
25: */
26:
27: package org.cougaar.core.util;
28:
29: /**
30: * Minimal base class for UniqueObjects that use the UID for equality.
31: */
32: public class UniqueObjectBase implements UniqueObject {
33: private final UID uid;
34:
35: public UniqueObjectBase(UID uid) {
36: if (uid == null) {
37: throw new IllegalArgumentException("null uid");
38: }
39: this .uid = uid;
40: }
41:
42: public final UID getUID() {
43: return uid;
44: }
45:
46: public final void setUID(UID uid) {
47: throw new IllegalStateException("UID cannot be changed");
48: }
49:
50: public final boolean equals(Object o) {
51: return ((o == this ) || ((o instanceof UniqueObject) && uid
52: .equals(((UniqueObject) o).getUID())));
53: }
54:
55: public final int hashCode() {
56: return uid.hashCode();
57: }
58:
59: public String toString() {
60: return "(" + getClass().getName() + " uid=" + uid + ")";
61: }
62: }
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