83 lines
2.1 KiB
Java
83 lines
2.1 KiB
Java
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/*
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* Copyright (C) 2013 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 android.util;
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import java.util.ArrayList;
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import java.util.Collections;
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public class SparseArray<E> {
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private final ArrayList<Integer> mKeys;
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private final ArrayList<E> mValues;
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public SparseArray() {
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this(10);
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}
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public SparseArray(final int initialCapacity) {
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mKeys = new ArrayList<>(initialCapacity);
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mValues = new ArrayList<>(initialCapacity);
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}
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public int size() {
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return mKeys.size();
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}
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public void clear() {
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mKeys.clear();
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mValues.clear();
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}
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public void put(final int key, final E value) {
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final int index = Collections.binarySearch(mKeys, key);
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if (index >= 0) {
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mValues.set(index, value);
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return;
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}
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final int insertIndex = ~index;
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mKeys.add(insertIndex, key);
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mValues.add(insertIndex, value);
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}
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public E get(final int key) {
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return get(key, null);
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}
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public E get(final int key, final E valueIfKeyNotFound) {
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final int index = Collections.binarySearch(mKeys, key);
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if (index >= 0) {
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return mValues.get(index);
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}
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return valueIfKeyNotFound;
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}
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public int indexOfKey(final int key) {
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return mKeys.indexOf(key);
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}
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public int indexOfValue(final E value) {
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return mValues.indexOf(value);
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}
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public int keyAt(final int index) {
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return mKeys.get(index);
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}
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public E valueAt(final int index) {
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return mValues.get(index);
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}
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}
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