KeysCache.java revision a28a05e971cc242b338331a3b78276fa95188d19 
1/*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
5 * use this file except in compliance with the License. You may obtain a copy of
6 * the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13 * License for the specific language governing permissions and limitations under
14 * the License.
15 */
16
17package com.android.inputmethod.keyboard.internal;
18
19import com.android.inputmethod.keyboard.Key;
20import com.android.inputmethod.latin.CollectionUtils;
21
22import java.util.HashMap;
23
24public final class KeysCache {
25    private final HashMap<Key, Key> mMap = CollectionUtils.newHashMap();
26
27    public void clear() {
28        mMap.clear();
29    }
30
31    public Key get(final Key key) {
32        final Key existingKey = mMap.get(key);
33        if (existingKey != null) {
34            // Reuse the existing element that equals to "key" without adding "key" to the map.
35            return existingKey;
36        }
37        mMap.put(key, key);
38        return key;
39    }
40}
41