1 /* 2 * Copyright (C) 2008 The Guava Authors 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.google.common.collect.testing; 18 19 import com.google.common.annotations.GwtCompatible; 20 21 import java.util.Collections; 22 import java.util.EnumSet; 23 import java.util.Iterator; 24 import java.util.ListIterator; 25 import java.util.Set; 26 27 /** 28 * A method supported by implementations of the {@link Iterator} or 29 * {@link ListIterator} interface. 30 * 31 * <p>This enum is GWT compatible. 32 * 33 * @author Chris Povirk 34 */ 35 @GwtCompatible 36 public enum IteratorFeature { 37 /** 38 * Support for {@link Iterator#remove()}. 39 */ 40 SUPPORTS_REMOVE, 41 /** 42 * Support for {@link ListIterator#add(Object)}; ignored for plain 43 * {@link Iterator} implementations. 44 */ 45 SUPPORTS_ADD, 46 /** 47 * Support for {@link ListIterator#set(Object)}; ignored for plain 48 * {@link Iterator} implementations. 49 */ 50 SUPPORTS_SET; 51 52 /** 53 * A set containing none of the optional features of the {@link Iterator} or 54 * {@link ListIterator} interfaces. 55 */ 56 public static final Set<IteratorFeature> UNMODIFIABLE = 57 Collections.emptySet(); 58 59 /** 60 * A set containing all of the optional features of the {@link Iterator} and 61 * {@link ListIterator} interfaces. 62 */ 63 public static final Set<IteratorFeature> MODIFIABLE = 64 Collections.unmodifiableSet(EnumSet.allOf(IteratorFeature.class)); 65 } 66