CollectionUtil.java

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package org.openkilda.utility;

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

public final class CollectionUtil {
    
    private CollectionUtil() {
    }


    public static boolean isEmpty(final Collection<?> collection) {
        return collection == null || collection.isEmpty();
    }
    
    public static String toString(final Collection<String> items, final String separator) {
        if(isEmpty(items)) {
            return null;
        }
        
        StringBuilder result = new StringBuilder();
        Iterator<String> iterator = items.iterator();

        while (iterator.hasNext()) {
            result.append(iterator.next());
            if (iterator.hasNext()) {
                result.append(separator);
            }
        }
        return result.toString();
    }
}