/*
* @(#)TupleEnumeration.java 1.4 06/10/10
*
* Copyright 1990-2008 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 only, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License version 2 for more details (a copy is
* included at /legal/license.txt).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this work; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 or visit www.sun.com if you need additional
* information or have any questions.
*
*/
package util;
import java.util.Enumeration;
import java.util.NoSuchElementException;
public
class TupleEnumeration implements Enumeration {
Enumeration enums[];
Enumeration cur;
int i;
int iMax;
public TupleEnumeration(Enumeration a, Enumeration b){
enums = new Enumeration[2];
enums[0] = a;
enums[1] = b;
cur = enums[0];
i = 0;
iMax = 1;
}
public TupleEnumeration(Enumeration arrayOfE[]){
enums = arrayOfE;
cur = enums[0];
i = 0;
iMax = enums.length-1;
}
public boolean hasMoreElements(){
if (cur.hasMoreElements()){
return true;
}
while (++i <= iMax){
cur = enums[i];
if (cur.hasMoreElements()){
return true;
}
}
return false;
}
public Object nextElement(){
NoSuchElementException caught;
try {
return cur.nextElement();
}catch(NoSuchElementException e){
caught = e;
}
while (++i <= iMax){
cur = enums[i];
try {
return cur.nextElement();
}catch(NoSuchElementException e){
caught = e;
}
}
throw caught;
}
}