| /* |
| * $Id$ |
| * |
| * 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.ArrayList; |
| import java.util.Collection; |
| import java.util.Enumeration; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Set; |
| |
| import org.apache.tiles.request.attribute.HasKeys; |
| |
| /** |
| * Exposes keys of a {@link HasKeys} object as a set. |
| * |
| * @version $Rev$ $Date$ |
| */ |
| public class KeySet implements Set<String> { |
| |
| /** |
| * The request to read. |
| */ |
| private HasKeys<?> request; |
| |
| /** |
| * Constructor. |
| * |
| * @param request The request to read. |
| */ |
| public KeySet(HasKeys<?> request) { |
| this.request = request; |
| } |
| |
| @Override |
| public boolean add(String e) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public boolean addAll(Collection<? extends String> c) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public void clear() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public boolean contains(Object o) { |
| return request.getValue(key(o)) != null; |
| } |
| |
| @SuppressWarnings("unchecked") |
| @Override |
| public boolean containsAll(Collection<?> c) { |
| Collection<String> realCollection = (Collection<String>) c; |
| for (String key : realCollection) { |
| if (request.getValue(key(key)) == null) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| @Override |
| public boolean isEmpty() { |
| return !request.getKeys().hasMoreElements(); |
| } |
| |
| @Override |
| public Iterator<String> iterator() { |
| return new KeySetIterator(); |
| } |
| |
| @Override |
| public boolean remove(Object o) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public boolean removeAll(Collection<?> c) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public boolean retainAll(Collection<?> c) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public int size() { |
| return enumerationSize(request.getKeys()); |
| } |
| |
| @Override |
| public Object[] toArray() { |
| return toList().toArray(); |
| } |
| |
| @Override |
| public <T> T[] toArray(T[] a) { |
| return toList().toArray(a); |
| } |
| |
| /** |
| * Turns this set into a list. |
| * |
| * @return The corresponding list. |
| */ |
| private List<String> toList() { |
| List<String> entries = new ArrayList<String>(); |
| Enumeration<String> names = request.getKeys(); |
| while (names.hasMoreElements()) { |
| entries.add(names.nextElement()); |
| } |
| return entries; |
| } |
| |
| /** |
| * Iterates elements of {@link KeySet}. |
| */ |
| private class KeySetIterator implements Iterator<String> { |
| |
| /** |
| * The key names enumeration. |
| */ |
| private Enumeration<String> namesEnumeration = request.getKeys(); |
| |
| @Override |
| public boolean hasNext() { |
| return namesEnumeration.hasMoreElements(); |
| } |
| |
| @Override |
| public String next() { |
| return namesEnumeration.nextElement(); |
| } |
| |
| @Override |
| public void remove() { |
| throw new UnsupportedOperationException(); |
| } |
| } |
| } |