82 lines
2.2 KiB
Java
82 lines
2.2 KiB
Java
/*
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* Copyright (C) 2014 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.inputmethod.keyboard.internal;
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import com.android.inputmethod.keyboard.Key;
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import java.util.HashMap;
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import javax.annotation.Nonnull;
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public abstract class UniqueKeysCache {
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public abstract void setEnabled(boolean enabled);
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public abstract void clear();
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public abstract @Nonnull Key getUniqueKey(@Nonnull Key key);
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@Nonnull
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public static final UniqueKeysCache NO_CACHE = new UniqueKeysCache() {
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@Override
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public void setEnabled(boolean enabled) {}
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@Override
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public void clear() {}
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@Override
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public Key getUniqueKey(Key key) { return key; }
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};
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@Nonnull
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public static UniqueKeysCache newInstance() {
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return new UniqueKeysCacheImpl();
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}
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private static final class UniqueKeysCacheImpl extends UniqueKeysCache {
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private final HashMap<Key, Key> mCache;
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private boolean mEnabled;
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UniqueKeysCacheImpl() {
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mCache = new HashMap<>();
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}
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@Override
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public void setEnabled(final boolean enabled) {
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mEnabled = enabled;
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}
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@Override
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public void clear() {
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mCache.clear();
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}
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@Override
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public Key getUniqueKey(final Key key) {
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if (!mEnabled) {
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return key;
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}
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final Key existingKey = mCache.get(key);
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if (existingKey != null) {
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// Reuse the existing object that equals to "key" without adding "key" to
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// the cache.
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return existingKey;
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}
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mCache.put(key, key);
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return key;
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}
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}
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}
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