126 lines
4.4 KiB
Java
126 lines
4.4 KiB
Java
/*
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* Copyright (C) 2023 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.net.wifi.util;
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import android.annotation.Nullable;
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import android.os.PersistableBundle;
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import java.util.Arrays;
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import java.util.Objects;
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/**
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* Utilities for {@link PersistableBundle}, which does not provide its own implementations of
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* equals() and hashCode().
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*
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* @hide
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*/
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public class PersistableBundleUtils {
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/** Generate a hashcode for the provided PersistableBundle. */
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public static int getHashCode(@Nullable PersistableBundle bundle) {
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if (bundle == null) {
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return -1;
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}
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int iterativeHashcode = 0;
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for (String key : bundle.keySet()) {
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Object val = bundle.get(key);
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if (val instanceof PersistableBundle) {
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iterativeHashcode =
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Objects.hash(iterativeHashcode, key, getHashCode((PersistableBundle) val));
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} else if (val.getClass().isArray()) {
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iterativeHashcode = Objects.hash(iterativeHashcode, key, getArrayHashCode(val));
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} else {
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iterativeHashcode = Objects.hash(iterativeHashcode, key, val);
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}
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}
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return iterativeHashcode;
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}
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private static int getArrayHashCode(Object arr) {
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if (arr instanceof boolean[]) {
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return Arrays.hashCode((boolean[]) arr);
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} else if (arr instanceof double[]) {
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return Arrays.hashCode((double[]) arr);
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} else if (arr instanceof int[]) {
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return Arrays.hashCode((int[]) arr);
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} else if (arr instanceof long[]) {
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return Arrays.hashCode((long[]) arr);
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} else if (arr instanceof String[]) {
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return Arrays.hashCode((String[]) arr);
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}
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return -1;
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}
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private static boolean arraysEqual(Object left, Object right) {
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if (left instanceof boolean[]) {
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return Arrays.equals((boolean[]) left, (boolean[]) right);
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} else if (left instanceof double[]) {
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return Arrays.equals((double[]) left, (double[]) right);
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} else if (left instanceof int[]) {
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return Arrays.equals((int[]) left, (int[]) right);
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} else if (left instanceof long[]) {
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return Arrays.equals((long[]) left, (long[]) right);
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} else if (left instanceof String[]) {
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return Arrays.equals((String[]) left, (String[]) right);
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}
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return false;
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}
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/** Check whether the provided PersistableBundles are equal. */
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public static boolean isEqual(
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@Nullable PersistableBundle left, @Nullable PersistableBundle right) {
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// Check for pointer equality and null equality.
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if (Objects.equals(left, right)) {
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return true;
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}
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if (Objects.isNull(left) != Objects.isNull(right)) {
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return false;
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}
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if (!left.keySet().equals(right.keySet())) {
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return false;
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}
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for (String key : left.keySet()) {
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Object leftVal = left.get(key);
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Object rightVal = right.get(key);
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if (Objects.equals(leftVal, rightVal)) {
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continue;
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} else if (!Objects.equals(leftVal.getClass(), rightVal.getClass())) {
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// If classes are different, not equal by definition.
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return false;
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}
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if (leftVal instanceof PersistableBundle) {
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if (!isEqual((PersistableBundle) leftVal, (PersistableBundle) rightVal)) {
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return false;
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}
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} else if (leftVal.getClass().isArray()) {
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if (!arraysEqual(leftVal, rightVal)) {
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return false;
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}
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} else {
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if (!Objects.equals(leftVal, rightVal)) {
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return false;
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}
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}
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}
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return true;
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}
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}
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