001/* 002 * Copyright (C) 2008 The Guava Authors 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package com.google.common.collect.testing; 018 019import static java.util.Arrays.asList; 020import static java.util.Collections.emptySet; 021import static java.util.Collections.unmodifiableSet; 022 023import com.google.common.annotations.GwtCompatible; 024import java.util.Iterator; 025import java.util.LinkedHashSet; 026import java.util.ListIterator; 027import java.util.Set; 028 029/** 030 * A method supported by implementations of the {@link Iterator} or {@link ListIterator} interface. 031 * 032 * <p>This enum is GWT compatible. 033 * 034 * @author Chris Povirk 035 */ 036@GwtCompatible 037public enum IteratorFeature { 038 /** Support for {@link Iterator#remove()}. */ 039 SUPPORTS_REMOVE, 040 /** 041 * Support for {@link ListIterator#add(Object)}; ignored for plain {@link Iterator} 042 * implementations. 043 */ 044 SUPPORTS_ADD, 045 /** 046 * Support for {@link ListIterator#set(Object)}; ignored for plain {@link Iterator} 047 * implementations. 048 */ 049 SUPPORTS_SET; 050 051 /** 052 * A set containing none of the optional features of the {@link Iterator} or {@link ListIterator} 053 * interfaces. 054 */ 055 public static final Set<IteratorFeature> UNMODIFIABLE = emptySet(); 056 057 /** 058 * A set containing all of the optional features of the {@link Iterator} and {@link ListIterator} 059 * interfaces. 060 */ 061 public static final Set<IteratorFeature> MODIFIABLE = 062 unmodifiableSet(new LinkedHashSet<>(asList(values()))); 063}