| /* |
| * 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: 1.1 $ $Date: 2009/05/27 22:16:34 $ |
| * |
| * @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(); |
| } |
| |
| } |