Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/* ============== HelperTools ==============
 * Initial developer: Lukas Diener <lukas.diener@hotmail.com>
 *
 * =====
 * DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE - Version 2
 *
 * Everyone is permitted to copy and distribute verbatim or modified
 * copies of this license document, and changing it is allowed as long
 * as the name is changed.
 *
 * DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
 * TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
 *
 * 0. You just DO WHAT THE FUCK YOU WANT TO.
 *
 * =====
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND.
 *
 */

import java.util.Collection;
import java.util.HashSet;
import java.util.Set;

public class Main {
    /**
     * This method performs a delta operation on two collections of elements; i.e. it returns a collection with elements that
     * are not found in the collection returns by the CollectionHelper.intersect() method.
     * The resulting collection guarantees unique membership as per implementation of the Java {@link java.util.Set} interface.
     * This is a null-safe operation.
     * @param firstGroup Collection to be used.
     * @param secondGroup Collection to be used.
     * @return The resulting collection which represents the delta of the two groups.
     */
    public static <T> Collection<T> delta(Collection<T> groupOne, Collection<T> groupTwo) {

        if (groupOne == null)
            return groupTwo;
        else if (groupTwo == null)
            return groupOne;

        Set<T> delta = new HashSet<T>();
        delta.addAll(findGroupOneDelta(groupOne, groupTwo));
        delta.addAll(findGroupTwoDelta(groupTwo, groupOne));
        return delta;
    }

    private static <T> Set<T> findGroupOneDelta(Collection<T> groupOne, Collection<T> groupTwo) {

        Set<T> delta = new HashSet<T>();
        for (T groupOneItem : groupOne)
            if (!groupTwo.contains(groupOneItem))
                delta.add(groupOneItem);
        return delta;
    }

    private static <T> Set<T> findGroupTwoDelta(Collection<T> groupOne, Collection<T> groupTwo) {

        Set<T> delta = new HashSet<T>();
        for (T groupOneItem : groupOne)
            if (!groupTwo.contains(groupOneItem))
                delta.add(groupOneItem);
        return delta;
    }
}