Java Collection Equal equalsCollectionsAnyOrder(Collection i1, Collection i2)

Description

Check if values in iterables are identical (in any order) This method check sizes first For first collection calls Iterable#iterator() only once, and several times for second collection (max = size of collection)

License

Open Source License

Declaration

public static boolean equalsCollectionsAnyOrder(Collection<?> i1,
        Collection<?> i2) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * The MIT License (MIT)//w w  w.j  a  v  a 2 s.  c  o  m
 * 
 * Copyright (c) 2016 Dalibor Drgo? <emptychannelmc@gmail.com>
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 ******************************************************************************/

import java.util.Collection;
import java.util.Iterator;

public class Main {
    /**
     * Check if values in iterables are identical (in any order)
     * This method check sizes first
     * For first collection calls Iterable#iterator() only once, and
     * several times for second collection (max = size of collection)
     */
    public static boolean equalsCollectionsAnyOrder(Collection<?> i1,
            Collection<?> i2) {
        if (i1 == i2) {
            return true;
        }
        if (i1 == null) {
            if (i2 == null) {
                return true;
            }
            return false;
        } else if (i2 == null) {
            return false;
        }
        int size = i1.size();
        if (size != i2.size()) {
            return false;
        }
        boolean[] was = new boolean[size];
        Iterator<?> it1 = i1.iterator();
        for (int i = 0; i < size; i++) {
            if (!it1.hasNext()) {
                return false;
            }
            Object cur = it1.next();
            Iterator<?> it2 = i2.iterator();
            boolean wasCur = false;
            if (cur == null) {
                for (int seci = 0; seci < size; seci++) {
                    if (!it2.hasNext()) {
                        return false;
                    }
                    Object cur2 = it2.next();
                    if (!was[seci]) {
                        if (cur2 == null) {
                            was[seci] = true;
                            wasCur = true;
                            break;
                        }
                    }
                }
            } else {
                for (int seci = 0; seci < size; seci++) {
                    if (!it2.hasNext()) {
                        return false;
                    }
                    Object cur2 = it2.next();
                    if (!was[seci]) {
                        if (cur.equals(cur2)) {
                            was[seci] = true;
                            wasCur = true;
                            break;
                        }
                    }
                }
            }
            if (!wasCur || it2.hasNext()) {
                return false;
            }
        }
        return !it1.hasNext();
    }

    public static boolean equals(Object[] one, Object[] two, int size) {
        if (one == two) {
            return true;
        }
        while (size-- != 0) {
            Object on = one[size];
            Object tw = two[size];
            if ((on == null) ? tw != null : !on.equals(tw)) {
                return false;
            }
        }
        return true;
    }

    public static boolean equals(Object[] one, int off1, Object[] two,
            int off2, int size) {
        if (one == two && off1 == off2) {
            return true;
        }
        size += off1;
        for (; off1 < size; off1++, off2++) {
            Object on = one[off1];
            Object tw = two[off2];
            if ((on == null) ? tw != null : !on.equals(tw)) {
                return false;
            }
        }
        return true;
    }
}

Related

1. equals(Collection collection1, Collection collection2)
2. equals(Collection a, Collection b, boolean ordered)
3. equals(final Collection c1, final Collection c2)
4. equals(Iterable collection1, Iterable collection2)
5. equalsAny(Object object, Collection