/*
* #!
* Ontopia Engine
* #-
* Copyright (C) 2001 - 2013 The Ontopia Project
* #-
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* !#
*/
package net.ontopia.utils;
import java.util.Collection;
import java.util.Iterator;
import org.apache.commons.collections4.iterators.IteratorChain;
/**
* INTERNAL: An iterator that works as a facade for multiple
* iterators. The iterator represents the sum of all the
* iterators.
*/
public class IteratorIterator<T> extends IteratorChain<T> {
/**
* @param colls_or_iters a collection of collections or iterators.
*/
public IteratorIterator(Collection<Collection<T>> colls_or_iters) {
super();
for (Collection<T> col : colls_or_iters) {
addIterator(col.iterator());
}
}
public IteratorIterator(Iterator<Iterator<T>> colls_or_iters) {
while (colls_or_iters.hasNext()) {
addIterator(colls_or_iters.next());
}
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
}