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Common library and dependencies shared with server and all adapters

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package org.openfact.common.util;

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

public class CollectionUtil {

    public static String join(Collection strings) {
        return join(strings, ", ");
    }

    public static String join(Collection strings, String separator) {
        Iterator iter = strings.iterator();
        StringBuilder sb = new StringBuilder();
        if (iter.hasNext()) {
            sb.append(iter.next());
            while (iter.hasNext()) {
                sb.append(separator).append(iter.next());
            }
        }
        return sb.toString();
    }

    // Return true if all items from col1 are in col2 and viceversa. Order is
    // not taken into account
    public static  boolean collectionEquals(Collection col1, Collection col2) {
        if (col1.size() != col2.size()) {
            return false;
        }

        for (T item : col1) {
            if (!col2.contains(item)) {
                return false;
            }
        }

        return true;
    }

}