/* * Copyright (C) 2013 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package android.util; import java.util.ArrayList; import java.util.Collections; public class SparseArray<E> { private final ArrayList<Integer> mKeys; private final ArrayList<E> mValues; public SparseArray() { this(10); } public SparseArray(final int initialCapacity) { mKeys = new ArrayList<>(initialCapacity); mValues = new ArrayList<>(initialCapacity); } public int size() { return mKeys.size(); } public void clear() { mKeys.clear(); mValues.clear(); } public void put(final int key, final E value) { final int index = Collections.binarySearch(mKeys, key); if (index >= 0) { mValues.set(index, value); return; } final int insertIndex = ~index; mKeys.add(insertIndex, key); mValues.add(insertIndex, value); } public E get(final int key) { return get(key, null); } public E get(final int key, final E valueIfKeyNotFound) { final int index = Collections.binarySearch(mKeys, key); if (index >= 0) { return mValues.get(index); } return valueIfKeyNotFound; } public int indexOfKey(final int key) { return mKeys.indexOf(key); } public int indexOfValue(final E value) { return mValues.indexOf(value); } public int keyAt(final int index) { return mKeys.get(index); } public E valueAt(final int index) { return mValues.get(index); } }