/*==========================================================================*\
| $Id: MultiIterator.java,v 1.2 2011/05/27 15:36:46 stedwar2 Exp $
|*-------------------------------------------------------------------------*|
| Copyright (C) 2006-2008 Virginia Tech
|
| This file is part of Web-CAT.
|
| Web-CAT is free software; you can redistribute it and/or modify
| it under the terms of the GNU Affero General Public License as published
| by the Free Software Foundation; either version 3 of the License, or
| (at your option) any later version.
|
| Web-CAT 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 for more details.
|
| You should have received a copy of the GNU Affero General Public License
| along with Web-CAT; if not, see <http://www.gnu.org/licenses/>.
\*==========================================================================*/
package org.webcat.reporter;
import java.util.Iterator;
//-------------------------------------------------------------------------
/**
* Supports iterating over a sequence of iterators by cycling through
* each one in turn until that one is exhausted, then moving on to the
* next.
*
* @param <T> The type of object returned by all the iterators contained
* within this multi-iterator.
*
* @author Tony Allevato
* @version $Id: MultiIterator.java,v 1.2 2011/05/27 15:36:46 stedwar2 Exp $
*/
public class MultiIterator<T>
implements Iterator<T>
{
//~ Constructor ...........................................................
// ----------------------------------------------------------
/**
* Construct a new object.
* @param iters The sequence of iterators to traverse
*/
public MultiIterator(Iterator<T>[] iters)
{
this.iterators = iters;
index = 0;
}
//~ Methods ...............................................................
// ----------------------------------------------------------
public boolean hasNext()
{
while (index < iterators.length
&& (iterators[index] == null || !iterators[index].hasNext()))
{
index++;
}
return index < iterators.length && iterators[index].hasNext();
}
// ----------------------------------------------------------
public T next()
{
return iterators[index].next();
}
// ----------------------------------------------------------
public void remove()
{
throw new RuntimeException("remove() is not supported");
}
//~ Instance/static variables .............................................
private Iterator<T>[] iterators;
private int index;
}