/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License
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*/
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package com.android.server.wm;
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import java.util.ArrayList;
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/**
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* An {@link ArrayList} with extended functionality to be used as the children data structure in
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* {@link WindowContainer}.
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*/
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class WindowList<E> extends ArrayList<E> {
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void addFirst(E e) {
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add(0, e);
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}
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E peekLast() {
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return size() > 0 ? get(size() - 1) : null;
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}
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E peekFirst() {
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return size() > 0 ? get(0) : null;
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}
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}
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