| /* |
| * Copyright (C) 2008 Google Inc. |
| * |
| * Licensed 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 com.google.inject.internal; |
| |
| import java.util.Collection; |
| import java.util.Set; |
| |
| /** |
| * Provides static methods for working with {@code Collection} instances. |
| * |
| * @author Chris Povirk |
| * @author Mike Bostock |
| * @author Jared Levy |
| */ |
| public final class Collections2 { |
| private Collections2() {} |
| |
| /** |
| * Converts an iterable into a collection. If the iterable is already a |
| * collection, it is returned. Otherwise, an {@link java.util.ArrayList} is |
| * created with the contents of the iterable in same iteration order. |
| */ |
| static <E> Collection<E> toCollection(Iterable<E> iterable) { |
| return (iterable instanceof Collection) |
| ? (Collection<E>) iterable : Lists.newArrayList(iterable); |
| } |
| |
| static boolean setEquals(Set<?> thisSet, @Nullable Object object) { |
| if (object == thisSet) { |
| return true; |
| } |
| if (object instanceof Set) { |
| Set<?> thatSet = (Set<?>) object; |
| return thisSet.size() == thatSet.size() |
| && thisSet.containsAll(thatSet); |
| } |
| return false; |
| } |
| } |