1 /* 2 * Copyright (C) 2009 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; 18 19 import static com.google.common.base.Preconditions.checkArgument; 20 21 import java.util.Set; 22 23 /** 24 * GWT emulation of {@link RegularImmutableSet}. 25 * 26 * @author Hayward Chan 27 */ 28 final class RegularImmutableSet<E> extends ForwardingImmutableSet<E> { 29 RegularImmutableSet(Set<E> delegate) { 30 super(delegate); 31 32 // Required for GWT deserialization because the server-side implementation 33 // requires this. 34 checkArgument(delegate.size() >= 2); 35 } 36 } 37
