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Improved Json record support (Gson 2.10 natively supports it) + Added ItemStack Json support

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- Extract RecordTypeAdapter to its own file + only use it if Gson library does not support it (it does since 2.10, but we are unsure of which version is actually used in paper/bungee/other)
- new ItemStackAdapter to support Json (de)serializing of Bukkit ItemStack.
This commit is contained in:
Marc Baloup
2023-03-12 14:14:17 +01:00
parent f1ef4e1927
commit b2f5770461
6 changed files with 151 additions and 80 deletions
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90
pandalib-core/src/main/java/fr/pandacube/lib/core/json/Json.java
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@@ -1,23 +1,15 @@
package fr.pandacube.lib.core.json;
import java.io.IOException;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.RecordComponent;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.function.Function;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.TypeAdapter;
import com.google.gson.TypeAdapterFactory;
import com.google.gson.internal.bind.ReflectiveTypeAdapterFactory;
import com.google.gson.reflect.TypeToken;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonToken;
import com.google.gson.stream.JsonWriter;
/**
* Provides pre-instanciated {@link Gson} instances, all with support for Java records and additionnal
@@ -98,81 +90,19 @@ public class Json {
private static boolean hasGsonNativeRecordSupport() {
for (Class<?> innerClasses : ReflectiveTypeAdapterFactory.class.getDeclaredClasses()) {
if (innerClasses.getSimpleName().equals("RecordAdapter"))
return true;
}
return false;
}
static {
registerTypeAdapterFactory(new RecordAdapterFactory());
if (!hasGsonNativeRecordSupport())
registerTypeAdapterFactory(RecordTypeAdapter.FACTORY);
}
// from https://github.com/google/gson/issues/1794#issuecomment-812964421
private static class RecordAdapterFactory implements TypeAdapterFactory {
@Override
public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> type) {
@SuppressWarnings("unchecked")
Class<T> clazz = (Class<T>) type.getRawType();
if (!clazz.isRecord() || clazz == Record.class) {
return null;
}
return new RecordTypeAdapter<>(gson, this, type);
}
}
private static class RecordTypeAdapter<T> extends TypeAdapter<T> {
private final Gson gson;
private final TypeAdapterFactory factory;
private final TypeToken<T> type;
public RecordTypeAdapter(Gson gson, TypeAdapterFactory factory, TypeToken<T> type) {
this.gson = gson;
this.factory = factory;
this.type = type;
}
@Override
public void write(JsonWriter out, T value) throws IOException {
gson.getDelegateAdapter(factory, type).write(out, value);
}
@Override
public T read(JsonReader reader) throws IOException {
if (reader.peek() == JsonToken.NULL) {
reader.nextNull();
return null;
} else {
@SuppressWarnings("unchecked")
Class<T> clazz = (Class<T>) type.getRawType();
RecordComponent[] recordComponents = clazz.getRecordComponents();
Map<String, TypeToken<?>> typeMap = new HashMap<>();
for (RecordComponent recordComponent : recordComponents) {
typeMap.put(recordComponent.getName(), TypeToken.get(recordComponent.getGenericType()));
}
var argsMap = new HashMap<String, Object>();
reader.beginObject();
while (reader.hasNext()) {
String name = reader.nextName();
argsMap.put(name, gson.getAdapter(typeMap.get(name)).read(reader));
}
reader.endObject();
var argTypes = new Class<?>[recordComponents.length];
var args = new Object[recordComponents.length];
for (int i = 0; i < recordComponents.length; i++) {
argTypes[i] = recordComponents[i].getType();
args[i] = argsMap.get(recordComponents[i].getName());
}
Constructor<T> constructor;
try {
constructor = clazz.getDeclaredConstructor(argTypes);
constructor.setAccessible(true);
return constructor.newInstance(args);
} catch (NoSuchMethodException | InstantiationException | SecurityException | IllegalAccessException
| IllegalArgumentException | InvocationTargetException e) {
throw new RuntimeException(e);
}
}
}
}
}

88
pandalib-core/src/main/java/fr/pandacube/lib/core/json/RecordTypeAdapter.java Normal file
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@@ -0,0 +1,88 @@
package fr.pandacube.lib.core.json;
import com.google.gson.Gson;
import com.google.gson.TypeAdapter;
import com.google.gson.TypeAdapterFactory;
import com.google.gson.reflect.TypeToken;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonToken;
import com.google.gson.stream.JsonWriter;
import java.io.IOException;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.RecordComponent;
import java.util.HashMap;
import java.util.Map;
// from https://github.com/google/gson/issues/1794#issuecomment-812964421
/* package */ class RecordTypeAdapter<T> extends TypeAdapter<T> {
public static final TypeAdapterFactory FACTORY = new TypeAdapterFactory() {
@Override
public <TT> TypeAdapter<TT> create(Gson gson, TypeToken<TT> type) {
@SuppressWarnings("unchecked")
Class<TT> clazz = (Class<TT>) type.getRawType();
if (!clazz.isRecord() || clazz == Record.class) {
return null;
}
return new RecordTypeAdapter<>(gson, this, type);
}
};
private final Gson gson;
private final TypeAdapterFactory factory;
private final TypeToken<T> type;
public RecordTypeAdapter(Gson gson, TypeAdapterFactory factory, TypeToken<T> type) {
this.gson = gson;
this.factory = factory;
this.type = type;
}
@Override
public void write(JsonWriter out, T value) throws IOException {
gson.getDelegateAdapter(factory, type).write(out, value);
}
@Override
public T read(JsonReader reader) throws IOException {
if (reader.peek() == JsonToken.NULL) {
reader.nextNull();
return null;
} else {
@SuppressWarnings("unchecked")
Class<T> clazz = (Class<T>) type.getRawType();
RecordComponent[] recordComponents = clazz.getRecordComponents();
Map<String, TypeToken<?>> typeMap = new HashMap<>();
for (RecordComponent recordComponent : recordComponents) {
typeMap.put(recordComponent.getName(), TypeToken.get(recordComponent.getGenericType()));
}
var argsMap = new HashMap<String, Object>();
reader.beginObject();
while (reader.hasNext()) {
String name = reader.nextName();
argsMap.put(name, gson.getAdapter(typeMap.get(name)).read(reader));
}
reader.endObject();
var argTypes = new Class<?>[recordComponents.length];
var args = new Object[recordComponents.length];
for (int i = 0; i < recordComponents.length; i++) {
argTypes[i] = recordComponents[i].getType();
args[i] = argsMap.get(recordComponents[i].getName());
}
Constructor<T> constructor;
try {
constructor = clazz.getDeclaredConstructor(argTypes);
constructor.setAccessible(true);
return constructor.newInstance(args);
} catch (NoSuchMethodException | InstantiationException | SecurityException | IllegalAccessException
| IllegalArgumentException | InvocationTargetException e) {
throw new RuntimeException(e);
}
}
}
}

2
pandalib-paper/src/main/java/fr/pandacube/lib/paper/PandaLibPaper.java
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@@ -1,5 +1,6 @@
package fr.pandacube.lib.paper;
import fr.pandacube.lib.paper.json.PaperJson;
import fr.pandacube.lib.paper.modules.PerformanceAnalysisManager;
import org.bukkit.plugin.Plugin;
@@ -9,6 +10,7 @@ public class PandaLibPaper {
public static void onLoad(Plugin plugin) {
PandaLibPaper.plugin = plugin;
PaperJson.init();
}
public static void onEnable() {

34
pandalib-paper/src/main/java/fr/pandacube/lib/paper/json/ItemStackAdapter.java Normal file
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@@ -0,0 +1,34 @@
package fr.pandacube.lib.paper.json;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonParseException;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;
import com.google.gson.TypeAdapterFactory;
import com.google.gson.internal.bind.TreeTypeAdapter;
import com.google.gson.reflect.TypeToken;
import org.bukkit.inventory.ItemStack;
import java.lang.reflect.Type;
import java.util.Map;
/* package */ class ItemStackAdapter implements JsonSerializer<ItemStack>, JsonDeserializer<ItemStack> {
private static final TypeToken<ItemStack> ITEMSTACK_TYPE = TypeToken.get(ItemStack.class);
public static final TypeAdapterFactory FACTORY = TreeTypeAdapter.newFactoryWithMatchRawType(ITEMSTACK_TYPE, new ItemStackAdapter());
private static final TypeToken<Map<String, Object>> MAP_STR_OBJ_TYPE = new TypeToken<>() { };
@Override
public ItemStack deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {
return ItemStack.deserialize(context.deserialize(json, MAP_STR_OBJ_TYPE.getType()));
}
@Override
public JsonElement serialize(ItemStack src, Type typeOfSrc, JsonSerializationContext context) {
return context.serialize(src.serialize(), MAP_STR_OBJ_TYPE.getType());
}
}

16
pandalib-paper/src/main/java/fr/pandacube/lib/paper/json/PaperJson.java Normal file
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@@ -0,0 +1,16 @@
package fr.pandacube.lib.paper.json;
import fr.pandacube.lib.core.json.Json;
/**
* Utility class to register Json adapters related to paper API classes.
*/
public class PaperJson {
/**
* Registers Json adapters related to paper API classes.
*/
public static void init() {
Json.registerTypeAdapterFactory(ItemStackAdapter.FACTORY);
}
}

1
pandalib-util/src/main/java/fr/pandacube/lib/util/BiMap.java
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@@ -13,6 +13,7 @@ import java.util.function.Supplier;
* A bi-direction map storing in a synchronized way a {@code forwardMap} that store the key to value mapping, and a
* {@code backwardMap} that store the value to key mapping.
* All the keys and value are always unique in this bi-directional map.
* This class is fully thread safe.
* @param <K> the type of the "key"
* @param <V> the type of the "value"
*/