container/services/src/main/java/org/mobicents/slee/runtime/sbbentity/ChildRelationImpl.java
@SuppressWarnings("rawtypes")
    public boolean retainAll(Collection c) {
        boolean flag = false;
        if (c == null)
            throw new NullPointerException(" null arg! ");
        for ( Iterator it = this.iterator(); it.hasNext();) {
            if ( ! c.contains(it.next())) {
                flag = true;
                it.remove();
            }
            
        }
        return flag;
    }
@SuppressWarnings("rawtypes")
    public boolean retainAll(Collection c) {
        boolean flag = false;
        if (c == null)
            throw new NullPointerException(" null arg! ");
        for ( Iterator it = this.iterator(); it.hasNext();) {
            if ( ! c.contains(it.next())) {
                flag = true;
                it.remove();
            }
            
        }
        return flag;
    }
/*
(non-Javadoc)

@see java.util.Collection#retainAll(java.util.Collection)