Java Iterable Join join(final Iterable<? extends T>... iterables)

Description

join

License

Open Source License

Declaration

static <T> Iterable<? extends T> join(final Iterable<? extends T>... iterables)

Method Source Code

//package com.java2s;
/*//from  ww  w .  ja  va2s . c  om
 * Copyright (C) 2012 eXo Platform SAS.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

import java.util.Iterator;
import java.util.NoSuchElementException;

public class Main {
    static <T> Iterable<? extends T> join(final Iterable<? extends T>... iterables) {
        return new Iterable<T>() {
            public Iterator<T> iterator() {
                return new Iterator<T>() {
                    int index;
                    Iterator<? extends T> current;
                    T next;

                    public boolean hasNext() {
                        if (next == null) {
                            while ((current == null || !current.hasNext()) && index < iterables.length) {
                                current = iterables[index++].iterator();
                            }
                            if (current != null && current.hasNext()) {
                                next = current.next();
                            }
                        }
                        return next != null;
                    }

                    public T next() {
                        if (!hasNext()) {
                            throw new NoSuchElementException();
                        }
                        T tmp = next;
                        next = null;
                        return tmp;
                    }

                    public void remove() {
                        throw new UnsupportedOperationException();
                    }
                };
            }
        };
    }
}

Java Iterable Join join(final Iterable... iterables)

Description

License

Declaration

Method Source Code

Related