- /*
- * Copyright 2003-2004 The Apache Software Foundation
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
- package org.apache.commons.collections.bag;
-
- import org.apache.commons.collections.Bag;
- import org.apache.commons.collections.functors.InstanceofPredicate;
-
- /**
- * Decorates another <code>Bag</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: 1.6 $ $Date: 2004/05/15 12:27:04 $
- *
- * @author Stephen Colebourne
- * @author Matthew Hawthorne
- */
- public class TypedBag {
-
- /**
- * Factory method to create a typed bag.
- * <p>
- * If there are any elements already in the bag being decorated, they
- * are validated.
- *
- * @param bag the bag to decorate, must not be null
- * @param type the type to allow into the bag, must not be null
- * @return a new typed Bag
- * @throws IllegalArgumentException if bag or type is null
- * @throws IllegalArgumentException if the bag contains invalid elements
- */
- public static Bag decorate(Bag bag, Class type) {
- return new PredicatedBag(bag, InstanceofPredicate.getInstance(type));
- }
-
- /**
- * Restrictive constructor.
- */
- protected TypedBag() {
- super();
- }
-
- }