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package org.apache.commons.collections.collection;

import java.util.Collection;

import org.apache.commons.collections.PredicateUtils;

/**
 * Decorates a <code>Collection</code> to validate that elements added are of a specific type.
 * <p>
 * The validation of additions is performed via an instanceof test against 
 * a specified <code>Class</code>. If an object cannot be added to the
 * collection, an IllegalArgumentException is thrown.
 *
 * @since Commons Collections 3.0
 * @version $Revision: 1.1 $ $Date: 2004/01/16 18:51:36 $
 * 
 * @author Stephen Colebourne
 * @author Matthew Hawthorne
 */
public class TypedCollection {

    /**
     * Factory method to create a typed collection.
     * <p>
     * If there are any elements already in the collection being decorated, they
     * are validated.
     * 
     * @param coll  the collection to decorate, must not be null
     * @param type  the type to allow into the collection, must not be null
     * @throws IllegalArgumentException if collection or type is null
     * @throws IllegalArgumentException if the collection contains invalid elements
     */
    public static Collection decorate(Collection coll, Class type) {
        return new PredicatedCollection(coll, PredicateUtils.instanceofPredicate(type));
    }
    
    /**
     * Restrictive constructor.
     */
    protected TypedCollection() {
    }

}
