Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 GNU LESSER GENERAL PUBLIC LICENSE
 Copyright (C) 2006 The Lobo Project
    
 This library 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 library 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 library; if not, write to the Free Software
 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
    
 Contact info: lobochief@users.sourceforge.net
 */

import java.util.Iterator;

import java.util.NoSuchElementException;

public class Main {
    public static <T> Iterator<T> iteratorUnion(final Iterator<T>[] iterators) {
        return new Iterator<T>() {
            private int iteratorIndex = 0;
            private Iterator<T> current = iterators.length > 0 ? iterators[0] : null;

            public boolean hasNext() {
                for (;;) {
                    if (current == null) {
                        return false;
                    }
                    if (current.hasNext()) {
                        return true;
                    }
                    iteratorIndex++;
                    current = iteratorIndex >= iterators.length ? null : iterators[iteratorIndex];
                }
            }

            public T next() {
                for (;;) {
                    if (this.current == null) {
                        throw new NoSuchElementException();
                    }
                    try {
                        return this.current.next();
                    } catch (final NoSuchElementException nse) {
                        this.iteratorIndex++;
                        this.current = this.iteratorIndex >= iterators.length ? null
                                : iterators[this.iteratorIndex];
                    }
                }
            }

            public void remove() {
                if (this.current == null) {
                    throw new NoSuchElementException();
                }
                this.current.remove();
            }
        };
    }
}