Class TypedCollection

java.lang.Object
org.apache.commons.collections.collection.TypedCollection

public class TypedCollection extends Object
Decorates a Collection to validate that elements added are of a specific type.

The validation of additions is performed via an instanceof test against a specified Class. If an object cannot be added to the collection, an IllegalArgumentException is thrown.

Since:
Commons Collections 3.0
Version:
$Revision: 646777 $ $Date: 2008-04-10 14:33:15 +0200 (Thu, 10 Apr 2008) $
Author:
Stephen Colebourne, Matthew Hawthorne
  • Constructor Details

    • TypedCollection

      protected TypedCollection()
      Restrictive constructor.
  • Method Details

    • decorate

      public static Collection decorate(Collection coll, Class type)
      Factory method to create a typed collection.

      If there are any elements already in the collection being decorated, they are validated.

      Parameters:
      coll - the collection to decorate, must not be null
      type - the type to allow into the collection, must not be null
      Returns:
      a new typed collection
      Throws:
      IllegalArgumentException - if collection or type is null
      IllegalArgumentException - if the collection contains invalid elements