341 lines
11 KiB
Java
341 lines
11 KiB
Java
/*
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* Copyright (C) 2019 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.util;
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import static java.util.Collections.emptySet;
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import android.annotation.Nullable;
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import android.os.Parcel;
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import android.text.TextUtils;
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import android.util.ArrayMap;
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import android.util.ArraySet;
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import java.time.Instant;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Map;
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import java.util.Set;
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import java.util.UUID;
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import java.util.regex.Pattern;
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/**
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* Describes a 2-way parcelling contract of type {@code T} into/out of a {@link Parcel}
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*
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* Implementations should be stateless.
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*
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* @param <T> the type being [un]parcelled
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*/
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@android.ravenwood.annotation.RavenwoodKeepWholeClass
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public interface Parcelling<T> {
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/**
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* Write an item into parcel.
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*/
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void parcel(T item, Parcel dest, int parcelFlags);
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/**
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* Read an item from parcel.
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*/
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T unparcel(Parcel source);
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/**
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* A registry of {@link Parcelling} singletons.
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*/
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class Cache {
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private Cache() {}
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private static ArrayMap<Class, Parcelling> sCache = new ArrayMap<>();
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/**
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* Retrieves an instance of a given {@link Parcelling} class if present.
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*/
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public static @Nullable <P extends Parcelling<?>> P get(Class<P> clazz) {
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return (P) sCache.get(clazz);
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}
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/**
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* Stores an instance of a given {@link Parcelling}.
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*
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* @return the provided parcelling for convenience.
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*/
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public static <P extends Parcelling<?>> P put(P parcelling) {
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sCache.put(parcelling.getClass(), parcelling);
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return parcelling;
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}
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/**
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* Produces an instance of a given {@link Parcelling} class, by either retrieving a cached
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* instance or reflectively creating one.
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*/
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public static <P extends Parcelling<?>> P getOrCreate(Class<P> clazz) {
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// No synchronization - creating an extra instance in a race case is ok
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P cached = get(clazz);
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if (cached != null) {
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return cached;
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} else {
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try {
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return put(clazz.newInstance());
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} catch (Exception e) {
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throw new RuntimeException(e);
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}
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}
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}
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}
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/**
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* Common {@link Parcelling} implementations.
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*/
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interface BuiltIn {
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class ForInternedString implements Parcelling<String> {
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@Override
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public void parcel(@Nullable String item, Parcel dest, int parcelFlags) {
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dest.writeString(item);
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}
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@Nullable
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@Override
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public String unparcel(Parcel source) {
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return TextUtils.safeIntern(source.readString());
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}
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}
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class ForInternedStringArray implements Parcelling<String[]> {
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@Override
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public void parcel(String[] item, Parcel dest, int parcelFlags) {
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dest.writeStringArray(item);
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}
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@Nullable
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@Override
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public String[] unparcel(Parcel source) {
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String[] array = source.readStringArray();
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if (array != null) {
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int size = ArrayUtils.size(array);
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for (int index = 0; index < size; index++) {
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array[index] = TextUtils.safeIntern(array[index]);
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}
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}
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return array;
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}
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}
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class ForInternedStringList implements Parcelling<List<String>> {
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@Override
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public void parcel(List<String> item, Parcel dest, int parcelFlags) {
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dest.writeStringList(item);
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}
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@Override
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public List<String> unparcel(Parcel source) {
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ArrayList<String> list = source.createStringArrayList();
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if (list != null) {
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int size = list.size();
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for (int index = 0; index < size; index++) {
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list.set(index, list.get(index).intern());
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}
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}
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return CollectionUtils.emptyIfNull(list);
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}
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}
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class ForInternedStringValueMap implements Parcelling<Map<String, String>> {
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@Override
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public void parcel(Map<String, String> item, Parcel dest, int parcelFlags) {
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dest.writeMap(item);
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}
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@Override
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public Map<String, String> unparcel(Parcel source) {
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ArrayMap<String, String> map = new ArrayMap<>();
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source.readMap(map, String.class.getClassLoader());
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for (int index = 0; index < map.size(); index++) {
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map.setValueAt(index, TextUtils.safeIntern(map.valueAt(index)));
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}
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return map;
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}
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}
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class ForStringSet implements Parcelling<Set<String>> {
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@Override
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public void parcel(Set<String> item, Parcel dest, int parcelFlags) {
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if (item == null) {
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dest.writeInt(-1);
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} else {
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dest.writeInt(item.size());
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for (String string : item) {
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dest.writeString(string);
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}
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}
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}
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@Override
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public Set<String> unparcel(Parcel source) {
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final int size = source.readInt();
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if (size < 0) {
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return emptySet();
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}
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Set<String> set = new ArraySet<>();
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for (int count = 0; count < size; count++) {
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set.add(source.readString());
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}
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return set;
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}
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}
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class ForInternedStringSet implements Parcelling<Set<String>> {
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@Override
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public void parcel(Set<String> item, Parcel dest, int parcelFlags) {
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if (item == null) {
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dest.writeInt(-1);
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} else {
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dest.writeInt(item.size());
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for (String string : item) {
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dest.writeString(string);
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}
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}
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}
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@Override
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public Set<String> unparcel(Parcel source) {
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final int size = source.readInt();
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if (size < 0) {
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return emptySet();
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}
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Set<String> set = new ArraySet<>();
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for (int count = 0; count < size; count++) {
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set.add(TextUtils.safeIntern(source.readString()));
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}
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return set;
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}
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}
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class ForInternedStringArraySet implements Parcelling<ArraySet<String>> {
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@Override
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public void parcel(ArraySet<String> item, Parcel dest, int parcelFlags) {
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if (item == null) {
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dest.writeInt(-1);
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} else {
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dest.writeInt(item.size());
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for (String string : item) {
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dest.writeString(string);
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}
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}
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}
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@Override
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public ArraySet<String> unparcel(Parcel source) {
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final int size = source.readInt();
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if (size < 0) {
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return null;
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}
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ArraySet<String> set = new ArraySet<>();
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for (int count = 0; count < size; count++) {
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set.add(TextUtils.safeIntern(source.readString()));
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}
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return set;
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}
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}
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class ForBoolean implements Parcelling<Boolean> {
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@Override
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public void parcel(@Nullable Boolean item, Parcel dest, int parcelFlags) {
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if (item == null) {
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// This writes 1 for null to mirror TypedArray.getInteger(booleanResId, 1)
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dest.writeInt(1);
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} else if (!item) {
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dest.writeInt(0);
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} else {
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dest.writeInt(-1);
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}
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}
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@Nullable
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@Override
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public Boolean unparcel(Parcel source) {
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switch (source.readInt()) {
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default:
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throw new IllegalStateException("Malformed Parcel reading Boolean: "
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+ source);
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case 1:
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return null;
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case 0:
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return Boolean.FALSE;
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case -1:
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return Boolean.TRUE;
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}
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}
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}
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class ForPattern implements Parcelling<Pattern> {
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@Override
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public void parcel(Pattern item, Parcel dest, int parcelFlags) {
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dest.writeString(item == null ? null : item.pattern());
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}
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@Override
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public Pattern unparcel(Parcel source) {
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String s = source.readString();
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return s == null ? null : Pattern.compile(s);
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}
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}
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class ForUUID implements Parcelling<UUID> {
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@Override
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public void parcel(UUID item, Parcel dest, int parcelFlags) {
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dest.writeString(item == null ? null : item.toString());
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}
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@Override
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public UUID unparcel(Parcel source) {
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String string = source.readString();
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return string == null ? null : UUID.fromString(string);
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}
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}
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/**
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* A {@link Parcelling} for {@link Instant}.
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*
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* The minimum value of an instant uses a millisecond offset of about -3.15e19 which is
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* larger than Long.MIN_VALUE, so we can use Long.MIN_VALUE as a sentinel value to indicate
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* a null Instant.
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*/
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class ForInstant implements Parcelling<Instant> {
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@Override
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public void parcel(Instant item, Parcel dest, int parcelFlags) {
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dest.writeLong(item == null ? Long.MIN_VALUE : item.getEpochSecond());
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dest.writeInt(item == null ? Integer.MIN_VALUE : item.getNano());
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}
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@Override
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public Instant unparcel(Parcel source) {
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long epochSecond = source.readLong();
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int afterNano = source.readInt();
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if (epochSecond == Long.MIN_VALUE) {
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return null;
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} else {
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return Instant.ofEpochSecond(epochSecond, afterNano);
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}
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}
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}
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}
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}
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