Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * File:                CollectionUtil.java
 * Authors:             Justin Basilico
 * Company:             Sandia National Laboratories
 * Project:             Cognitive Foundry
 *
 * Copyright March 25, 2008, Sandia Corporation.
 * Under the terms of Contract DE-AC04-94AL85000, there is a non-exclusive
 * license for use of this work by or on behalf of the U.S. Government. Export
 * of this program may require a license from the United States Government.
 * See CopyrightHistory.txt for complete details.
 *
 */

import java.util.List;

public class Main {
    /**
     * Returns the indexed value into the {@code Iterable}. It first checks to
     * see if the {@code Iterable} is a {@code List}, and if so calls the get
     * method. Otherwise, it walks the {@code Iterable} to get to the element.
     *
     * @param <DataType>
     *      The type of data.
     * @param iterable
     *      The iterable to pull the value from.
     * @param index
     *      The 0-based index to pull from the iterable.
     * @return
     *      The value at the given spot in the iterable.
     * @throws IndexOutOfBoundsException
     *      If the index is less than zero or greater than or equal to the
     *      number of elements in the iterable.
     */
    public static <DataType> DataType getElement(final Iterable<DataType> iterable, int index) {
        if (iterable instanceof List<?>) {
            return ((List<DataType>) iterable).get(index);
        } else {
            if (index < 0) {
                // Bad index.
                throw new IndexOutOfBoundsException("index must be >= 0");
            }

            for (DataType v : iterable) {
                if (index == 0) {
                    return v;
                }

                index--;
            }

            // Bad index.
            throw new IndexOutOfBoundsException("index >= iterable size");
        }

    }
}