| /* |
| * Copyright (C) 2015 The Guava Authors |
| * |
| * 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.common.collect; |
| |
| import static com.google.common.base.Preconditions.checkNotNull; |
| |
| import com.google.common.annotations.GwtCompatible; |
| import java.util.ArrayDeque; |
| import java.util.Collections; |
| import java.util.Queue; |
| |
| /** |
| * An Iterator implementation which draws elements from a queue, removing them from the queue as it |
| * iterates. |
| */ |
| @GwtCompatible |
| class ConsumingQueueIterator<T> extends AbstractIterator<T> { |
| private final Queue<T> queue; |
| |
| ConsumingQueueIterator(T... elements) { |
| this.queue = new ArrayDeque<T>(elements.length); |
| Collections.addAll(queue, elements); |
| } |
| |
| ConsumingQueueIterator(Queue<T> queue) { |
| this.queue = checkNotNull(queue); |
| } |
| |
| @Override |
| public T computeNext() { |
| return queue.isEmpty() ? endOfData() : queue.remove(); |
| } |
| } |