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JaVers - object auditing and diff framework for Java

There is a newer version: 7.6.1

package org.javers.guava;

import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.ForwardingMultimap;
import com.google.common.collect.Multimap;
import org.javers.common.collections.Sets;

import java.util.Collections;
import java.util.Set;

/**
 * @author akrystian
 */
class Multimaps{
    /**
     * null args are allowed
     */
    public static  Set commonKeys(Multimap left, Multimap right){
        if (left == null || right == null) {
            return Collections.emptySet();
        }

        return Sets.intersection(left.keySet(), right.keySet());
    }

    /**
     * null args are allowed
     */
    public static  Set keysDifference(Multimap left, Multimap right){
        if (left == null){
            return Collections.emptySet();
        }

        if (right == null){
            return left.keySet();
        }

        return Sets.difference(left.keySet(), right.keySet());
    }

    public static Multimap toNotNullMultimap(Object sourceMap){
        if (sourceMap == null){
            return ArrayListMultimap.create();
        }else{
            return (Multimap) sourceMap;
        }
    }
}