Equal check for Collection and their elements without restricting the order of their elements. - Java java.util

Java examples for java.util:Collection Element

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Description

Equal check for Collection and their elements without restricting the order of their elements.

Demo Code


import java.util.Collection;
import static be.seriousbusiness.brusselnieuws.rss.common.util.ObjectUtil.equalClass;
import static be.seriousbusiness.brusselnieuws.rss.common.util.ObjectUtil.equalReference;

public class Main{
    /**/*from   w ww  . jav  a2s .  c o  m*/
     * Equals {@link Collection}s and their elements without restricting the order of their elements.
     * @param collections array of Collection(s)
     * @return <code>true</code> when all collection elements are equal
     * @since 1.0
     * @see {@link ObjectUtil#equalReference(Object...)}
     * @see {@link ObjectUtil#equalClass(Object...)}
     */
    public static final <T1, T2 extends Collection<T1>> boolean equals(
            @SuppressWarnings("unchecked") final T2... collections) {
        if (equalReference(collections)) {
            return true;
        }
        if (!equalClass(collections)) {
            return false;
        }
        // TODO : remove when approved
        //final int size=collections[0].size(),numberOfNull=numberOfNull(collections[0].toArray());
        for (int i = 1; i < collections.length; i++) {
            /* TODO : remove when approved
            if(!collections[i].containsAll(collections[0]) ||
                  numberOfNull!=numberOfNull(collections[i].toArray()) ||
                        size!=collections[i].size()) { return false; }
             */
            if (!collections[i].containsAll(collections[0])
                    || collections[0].size() != collections[i].size()) {
                return false;
            }
            /* TODO : remove when approved
            int j=0;
            for(final T1 t1A : collections[i]) {
               for(final T1 t1B : collections[0]) {
                  if(t1A!=null && t1B!=null && t1A.equals(t1B)) { j++; break; }
               }
            }
            if((j+numberOfNull)!=size) { return false; }
             */
        }
        return true;
    }
}

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