org.apache.commons.collections.list

## Class TypedList

- java.lang.Object
- - org.apache.commons.collections.list.TypedList

-     public class TypedList
      extends Object

  Decorates another `List` 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 Summary

    Constructors
    Modifier | Constructor and Description
    --- | ---
    `protected` | `TypedList()` Restrictive constructor.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `static List` | `decorate(List list, Class type)` Factory method to create a typed list.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### TypedList

          protected TypedList()

      Restrictive constructor.

  - ### Method Detail

    - #### decorate

          public static List decorate(List list,
                      Class type)

      Factory method to create a typed list.

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

      Parameters:
        `list` - the list to decorate, must not be null
        `type` - the type to allow into the collection, must not be null
      Throws:
        `IllegalArgumentException` - if list or type is null
        `IllegalArgumentException` - if the list contains invalid elements

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