| /* |
| * $Id$ |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.tiles.request.collection; |
| |
| import static org.apache.tiles.request.collection.CollectionUtil.*; |
| |
| import java.util.Collection; |
| import java.util.Enumeration; |
| import java.util.LinkedHashSet; |
| import java.util.Set; |
| |
| import org.apache.tiles.request.attribute.HasRemovableKeys; |
| |
| /** |
| * Wraps {@link HasRemovableKeys} keys as a set. |
| * |
| * @version $Rev$ $Date$ |
| */ |
| public class RemovableKeySet extends KeySet { |
| |
| /** |
| * The request. |
| */ |
| private HasRemovableKeys<?> request; |
| |
| /** |
| * Constructor. |
| * |
| * @param request The request. |
| */ |
| public RemovableKeySet(HasRemovableKeys<?> request) { |
| super(request); |
| this.request = request; |
| } |
| |
| @Override |
| public boolean remove(Object o) { |
| String skey = key(o); |
| Object previous = request.getValue(skey); |
| if (previous != null) { |
| request.removeValue(skey); |
| return true; |
| } |
| return false; |
| } |
| |
| @SuppressWarnings("unchecked") |
| @Override |
| public boolean removeAll(Collection<?> c) { |
| Collection<String> realCollection = (Collection<String>) c; |
| boolean retValue = false; |
| for (String entry : realCollection) { |
| retValue |= remove(entry); |
| } |
| return retValue; |
| } |
| |
| @SuppressWarnings("unchecked") |
| @Override |
| public boolean retainAll(Collection<?> c) { |
| Collection<String> realCollection = (Collection<String>) c; |
| boolean retValue = false; |
| Set<String> keysToRemove = new LinkedHashSet<String>(); |
| for (Enumeration<String> keys = request.getKeys(); keys.hasMoreElements();) { |
| String key = keys.nextElement(); |
| if (!realCollection.contains(key)) { |
| retValue = true; |
| keysToRemove.add(key); |
| } |
| } |
| for (String key : keysToRemove) { |
| request.removeValue(key); |
| } |
| return retValue; |
| } |
| |
| } |