| /* |
| * 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 freemarker.core; |
| |
| import java.util.Iterator; |
| import java.util.Set; |
| |
| /** Don't use this; used internally by FreeMarker, might changes without notice. */ |
| public class _UnmodifiableCompositeSet<E> extends _UnmodifiableSet<E> { |
| |
| private final Set<E> set1, set2; |
| |
| public _UnmodifiableCompositeSet(Set<E> set1, Set<E> set2) { |
| this.set1 = set1; |
| this.set2 = set2; |
| } |
| |
| @Override |
| public Iterator<E> iterator() { |
| return new CompositeIterator(); |
| } |
| |
| @Override |
| public boolean contains(Object o) { |
| return set1.contains(o) || set2.contains(o); |
| } |
| |
| @Override |
| public int size() { |
| return set1.size() + set2.size(); |
| } |
| |
| private class CompositeIterator implements Iterator<E> { |
| |
| private Iterator<E> it1, it2; |
| private boolean it1Deplected; |
| |
| public boolean hasNext() { |
| if (!it1Deplected) { |
| if (it1 == null) { |
| it1 = set1.iterator(); |
| } |
| if (it1.hasNext()) { |
| return true; |
| } |
| |
| it2 = set2.iterator(); |
| it1 = null; |
| it1Deplected = true; |
| // Falls through |
| } |
| return it2.hasNext(); |
| } |
| |
| public E next() { |
| if (!it1Deplected) { |
| if (it1 == null) { |
| it1 = set1.iterator(); |
| } |
| if (it1.hasNext()) { |
| return it1.next(); |
| } |
| |
| it2 = set2.iterator(); |
| it1 = null; |
| it1Deplected = true; |
| // Falls through |
| } |
| return it2.next(); |
| } |
| |
| public void remove() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| } |
| |
| } |