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Redis Java client with features of In-Memory Data Grid

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/**
 * Copyright 2014 Nikita Koksharov, Nickolay Borbit
 *
 * 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 org.redisson.misc;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class CompositeIterable implements Iterable, Iterator {

    private List> iterablesList;
    private Iterable[] iterables;

    private Iterator> listIterator;
    private Iterator currentIterator;

    public CompositeIterable(List> iterables) {
        this.iterablesList = iterables;
    }

    public CompositeIterable(Iterable ... iterables) {
        this.iterables = iterables;
    }

    public CompositeIterable(CompositeIterable iterable) {
        this.iterables = iterable.iterables;
        this.iterablesList = iterable.iterablesList;
    }

    @Override
    public Iterator iterator() {
        List> iterators = new ArrayList>();
        if (iterables != null) {
            for (Iterable iterable : iterables) {
                iterators.add(iterable.iterator());
            }
        } else {
            for (Iterable iterable : iterablesList) {
                iterators.add(iterable.iterator());
            }
        }
        listIterator = iterators.iterator();
        currentIterator = null;
        return this;
    }

    @Override
    public boolean hasNext() {
        if (currentIterator == null || !currentIterator.hasNext()) {
            while (listIterator.hasNext()) {
                Iterator iterator = listIterator.next();
                if (iterator.hasNext()) {
                    currentIterator = iterator;
                    return true;
                }
            }
            return false;
        }
        return currentIterator.hasNext();
    }

    @Override
    public T next() {
        hasNext();
        return currentIterator.next();
    }

    @Override
    public void remove() {
        currentIterator.remove();
    }

}