How to use

org.apache.commons.collections.collection.UnmodifiableCollection

constructor

/**
 * Factory method to create an unmodifiable collection.
 * <p>
 * If the collection passed in is already unmodifiable, it is returned.
 * 
 * @param coll  the collection to decorate, must not be null
 * @return an unmodifiable collection
 * @throws IllegalArgumentException if collection is null
 */
public static Collection decorate(Collection coll) {
  if (coll instanceof Unmodifiable) {
    return coll;
  }
  return new UnmodifiableCollection(coll);
}

/**
 * Factory method to create an unmodifiable collection.
 * <p>
 * If the collection passed in is already unmodifiable, it is returned.
 * 
 * @param coll  the collection to decorate, must not be null
 * @return an unmodifiable collection
 * @throws IllegalArgumentException if collection is null
 */
public static Collection decorate(Collection coll) {
  if (coll instanceof Unmodifiable) {
    return coll;
  }
  return new UnmodifiableCollection(coll);
}

/**
 * Factory method to create an unmodifiable collection.
 * <p>
 * If the collection passed in is already unmodifiable, it is returned.
 * 
 * @param coll  the collection to decorate, must not be null
 * @return an unmodifiable collection
 * @throws IllegalArgumentException if collection is null
 */
public static Collection decorate(Collection coll) {
  if (coll instanceof Unmodifiable) {
    return coll;
  }
  return new UnmodifiableCollection(coll);
}

/**
 * Factory method to create an unmodifiable collection.
 * <p>
 * If the collection passed in is already unmodifiable, it is returned.
 * 
 * @param coll  the collection to decorate, must not be null
 * @return an unmodifiable collection
 * @throws IllegalArgumentException if collection is null
 */
public static Collection decorate(Collection coll) {
  if (coll instanceof Unmodifiable) {
    return coll;
  }
  return new UnmodifiableCollection(coll);
}

/**
 * Factory method to create an unmodifiable collection.
 * <p>
 * If the collection passed in is already unmodifiable, it is returned.
 * 
 * @param coll  the collection to decorate, must not be null
 * @return an unmodifiable collection
 * @throws IllegalArgumentException if collection is null
 */
public static Collection decorate(Collection coll) {
  if (coll instanceof Unmodifiable) {
    return coll;
  }
  return new UnmodifiableCollection(coll);
}
 

/**
 * Factory method to create an unmodifiable collection.
 * <p>
 * If the collection passed in is already unmodifiable, it is returned.
 * 
 * @param coll  the collection to decorate, must not be null
 * @return an unmodifiable collection
 * @throws IllegalArgumentException if collection is null
 */
public static Collection decorate(Collection coll) {
  if (coll instanceof Unmodifiable) {
    return coll;
  }
  return new UnmodifiableCollection(coll);
}

/**
 * Factory method to create an unmodifiable collection.
 * <p>
 * If the collection passed in is already unmodifiable, it is returned.
 * 
 * @param coll  the collection to decorate, must not be null
 * @return an unmodifiable collection
 * @throws IllegalArgumentException if collection is null
 */
public static Collection decorate(Collection coll) {
  if (coll instanceof Unmodifiable) {
    return coll;
  }
  return new UnmodifiableCollection(coll);
}
 

 public UnmodifiableCollection giveMeSomeUnmodifableCollection() {
  return new UnmodifiableCollection(new LinkedList());
}