| 1 | package org.jtoolkit.essence.utils.impl; |
| 2 | |
| 3 | /* |
| 4 | Copyright 2006 Peter Lawrey |
| 5 | |
| 6 | Licensed under the Apache License, Version 2.0 (the "License"); |
| 7 | you may not use this file except in compliance with the License. |
| 8 | You may obtain a copy of the License at |
| 9 | |
| 10 | http://www.apache.org/licenses/LICENSE-2.0 |
| 11 | |
| 12 | Unless required by applicable law or agreed to in writing, software |
| 13 | distributed under the License is distributed on an "AS IS" BASIS, |
| 14 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 15 | See the License for the specific language governing permissions and |
| 16 | limitations under the License. |
| 17 | */ |
| 18 | import org.jetbrains.annotations.NotNull; |
| 19 | |
| 20 | import java.util.LinkedHashMap; |
| 21 | import java.util.Map; |
| 22 | import java.util.Set; |
| 23 | |
| 24 | /** |
| 25 | * @author Peter Lawrey |
| 26 | */ |
| 27 | public class MapOfMap<K1, K2, V> { |
| 28 | private final Map<K1, Map<K2, V>> backing = new LinkedHashMap<K1, Map<K2, V>>(); |
| 29 | public void put(@NotNull K1 key, @NotNull K2 key2, V value) { |
| 30 | Map<K2, V> map = backing.get(key); |
| 31 | if (map == null) backing.put(key, map = new LinkedHashMap<K2, V>()); |
| 32 | map.put(key2, value); |
| 33 | } |
| 34 | |
| 35 | /* |
| 36 | @Nullable public V remove(@NotNull K1 key, @NotNull K2 key2) { |
| 37 | Map<K2, V> map = backing.get(key); |
| 38 | if (map == null) return null; |
| 39 | V prev = map.remove(key2); |
| 40 | if (map.isEmpty()) |
| 41 | backing.remove(key); |
| 42 | return prev; |
| 43 | } |
| 44 | */ |
| 45 | |
| 46 | public Set<K1> keySet() { |
| 47 | return backing.keySet(); |
| 48 | } |
| 49 | |
| 50 | public Map<K2, V> get(K1 key1) { |
| 51 | return backing.get(key1); |
| 52 | } |
| 53 | } |