01: /*
02: * @(#)TupleEnumeration.java 1.4 06/10/10
03: *
04: * Copyright 1990-2006 Sun Microsystems, Inc. All Rights Reserved.
05: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
06: *
07: * This program is free software; you can redistribute it and/or
08: * modify it under the terms of the GNU General Public License version
09: * 2 only, as published by the Free Software Foundation.
10: *
11: * This program is distributed in the hope that it will be useful, but
12: * WITHOUT ANY WARRANTY; without even the implied warranty of
13: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14: * General Public License version 2 for more details (a copy is
15: * included at /legal/license.txt).
16: *
17: * You should have received a copy of the GNU General Public License
18: * version 2 along with this work; if not, write to the Free Software
19: * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20: * 02110-1301 USA
21: *
22: * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
23: * Clara, CA 95054 or visit www.sun.com if you need additional
24: * information or have any questions.
25: *
26: */
27:
28: package util;
29:
30: import java.util.Enumeration;
31: import java.util.NoSuchElementException;
32:
33: public class TupleEnumeration implements Enumeration {
34: Enumeration enums[];
35: Enumeration cur;
36: int i;
37: int iMax;
38:
39: public TupleEnumeration(Enumeration a, Enumeration b) {
40: enums = new Enumeration[2];
41: enums[0] = a;
42: enums[1] = b;
43: cur = enums[0];
44: i = 0;
45: iMax = 1;
46: }
47:
48: public TupleEnumeration(Enumeration arrayOfE[]) {
49: enums = arrayOfE;
50: cur = enums[0];
51: i = 0;
52: iMax = enums.length - 1;
53: }
54:
55: public boolean hasMoreElements() {
56: if (cur.hasMoreElements()) {
57: return true;
58: }
59: while (++i <= iMax) {
60: cur = enums[i];
61: if (cur.hasMoreElements()) {
62: return true;
63: }
64: }
65: return false;
66: }
67:
68: public Object nextElement() {
69: NoSuchElementException caught;
70: try {
71: return cur.nextElement();
72: } catch (NoSuchElementException e) {
73: caught = e;
74: }
75: while (++i <= iMax) {
76: cur = enums[i];
77: try {
78: return cur.nextElement();
79: } catch (NoSuchElementException e) {
80: caught = e;
81: }
82: }
83: throw caught;
84: }
85:
86: }
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