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package org.apache.commons.collections.set;
import java.util.SortedSet;
import org.apache.commons.collections.PredicateUtils;
/**
* Decorates another SortedSet
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: 1.2 $ $Date: 2004/01/14 21:43:13 $
*
* @author Stephen Colebourne
* @author Matthew Hawthorne
*/
public class TypedSortedSet {
/**
* Factory method to create a typed sorted set.
*
* If there are any elements already in the set being decorated, they
* are validated.
*
* @param set the set to decorate, must not be null
* @param type the type to allow into the collection, must not be null
* @throws IllegalArgumentException if set or type is null
* @throws IllegalArgumentException if the set contains invalid elements
*/
public static SortedSet decorate(SortedSet set, Class type) {
return new PredicatedSortedSet(set, PredicateUtils.instanceofPredicate(type));
}
/**
* Restrictive constructor.
*/
protected TypedSortedSet() {
}
}