/*
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* Copyright (C) 2016 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.launcher3.util;
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import java.util.ArrayList;
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import java.util.HashMap;
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/**
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* A utility map from keys to an ArrayList of values.
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*/
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public class MultiHashMap<K, V> extends HashMap<K, ArrayList<V>> {
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public MultiHashMap() { }
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public MultiHashMap(int size) {
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super(size);
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}
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public void addToList(K key, V value) {
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ArrayList<V> list = get(key);
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if (list == null) {
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list = new ArrayList<>();
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list.add(value);
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put(key, list);
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} else {
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list.add(value);
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}
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}
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@Override
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public MultiHashMap<K, V> clone() {
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MultiHashMap<K, V> map = new MultiHashMap<>(size());
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for (Entry<K, ArrayList<V>> entry : entrySet()) {
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map.put(entry.getKey(), new ArrayList<V>(entry.getValue()));
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}
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return map;
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}
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}
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