TypedCollection (Commons Collections 3.2.2 API)

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 Summary

Constructors
Modifier Constructor Description

protected TypedCollection()
Restrictive constructor.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static Collection`	`decorate(Collection coll, Class type)`	Factory method to create a typed collection.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - TypedCollection
```
protected TypedCollection()
```
    Restrictive constructor.
- Method Detail
  - 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