79 lines
2.0 KiB
Java
79 lines
2.0 KiB
Java
/*
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* Copyright (C) 2020 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.internal.telephony;
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import android.util.ArrayMap;
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import java.util.Collection;
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import java.util.Map;
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/**
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* A very basic bidirectional map.
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*/
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public class BiMap<K, V> {
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private Map<K, V> mPrimaryMap = new ArrayMap<>();
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private Map<V, K> mSecondaryMap = new ArrayMap<>();
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public boolean put(K key, V value) {
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if (key == null || value == null || mPrimaryMap.containsKey(key) ||
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mSecondaryMap.containsKey(value)) {
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return false;
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}
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mPrimaryMap.put(key, value);
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mSecondaryMap.put(value, key);
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return true;
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}
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public boolean remove(K key) {
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if (key == null) {
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return false;
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}
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if (mPrimaryMap.containsKey(key)) {
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V value = getValue(key);
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mPrimaryMap.remove(key);
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mSecondaryMap.remove(value);
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return true;
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}
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return false;
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}
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public boolean removeValue(V value) {
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if (value == null) {
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return false;
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}
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return remove(getKey(value));
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}
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public V getValue(K key) {
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return mPrimaryMap.get(key);
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}
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public K getKey(V value) {
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return mSecondaryMap.get(value);
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}
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public Collection<V> getValues() {
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return mPrimaryMap.values();
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}
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public void clear() {
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mPrimaryMap.clear();
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mSecondaryMap.clear();
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}
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}
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