01: /*
02: * <copyright>
03: *
04: * Copyright 1997-2004 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.util;
28:
29: /**
30: * Wrapper around a String for use as a key in a hash table (hashMap, etc).
31: * Has the benefit that it prevents recomputation of the hashCode each time.
32: * Wherever possible, it is still much better to have the objects themselves
33: * provide a cheap hashcode.
34: **/
35:
36: public final class StringKey {
37: private final String string;
38: private final int hc;
39:
40: public StringKey(String s) {
41: string = s;
42: hc = s.hashCode();
43: }
44:
45: public StringKey(Object o) {
46: string = o.toString();
47: hc = string.hashCode();
48: }
49:
50: public final boolean equals(Object o) {
51: if (this == o)
52: return true;
53: if (o instanceof StringKey) {
54: return string.equals(((StringKey) o).string);
55: }
56: return false;
57: }
58:
59: public final int hashCode() {
60: return hc;
61: }
62:
63: public final String toString() {
64: return string;
65: }
66: }
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