PandacubeFr/PandaLib
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Improves Json util class: ability to add TypeAdapterFactory on the fly.

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This commit is contained in:
Marc Baloup
2023-03-09 18:57:09 +01:00
parent a6bde9e191
commit df46026457
3 changed files with 57 additions and 15 deletions
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61
pandalib-core/src/main/java/fr/pandacube/lib/core/json/Json.java
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@@ -4,7 +4,9 @@ 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;
@@ -18,30 +20,35 @@ import com.google.gson.stream.JsonToken;
import com.google.gson.stream.JsonWriter;
/**
* Provides pre-instanciated {@link Gson} instances, all with support for Java records.
* Provides pre-instanciated {@link Gson} instances, all with support for Java records and additionnal
* {@link TypeAdapterFactory} provided with {@link #registerTypeAdapterFactory(TypeAdapterFactory)}.
*/
public class Json {
/**
* {@link Gson} instance with {@link GsonBuilder#setLenient()} and support for Java records.
* {@link Gson} instance with {@link GsonBuilder#setLenient()} and support for Java records and additionnal
* {@link TypeAdapterFactory} provided with {@link #registerTypeAdapterFactory(TypeAdapterFactory)}.
*/
public static final Gson gson = build(Function.identity());
/**
* {@link Gson} instance with {@link GsonBuilder#setLenient()}, {@link GsonBuilder#setPrettyPrinting()}
* and support for Java records.
* {@link Gson} instance with {@link GsonBuilder#setLenient()}, {@link GsonBuilder#setPrettyPrinting()} and support
* for Java records and additionnal {@link TypeAdapterFactory} provided with
* {@link #registerTypeAdapterFactory(TypeAdapterFactory)}.
*/
public static final Gson gsonPrettyPrinting = build(GsonBuilder::setPrettyPrinting);
/**
* {@link Gson} instance with {@link GsonBuilder#setLenient()}, {@link GsonBuilder#serializeNulls()}
* and support for Java records.
* {@link Gson} instance with {@link GsonBuilder#setLenient()}, {@link GsonBuilder#serializeNulls()} and support for
* Java records and additionnal {@link TypeAdapterFactory} provided with
* {@link #registerTypeAdapterFactory(TypeAdapterFactory)}.
*/
public static final Gson gsonSerializeNulls = build(GsonBuilder::serializeNulls);
/**
* {@link Gson} instance with {@link GsonBuilder#setLenient()}, {@link GsonBuilder#serializeNulls()},
* {@link GsonBuilder#setPrettyPrinting()} and support for Java records.
* {@link GsonBuilder#setPrettyPrinting()} and support for Java records and additionnal {@link TypeAdapterFactory}
* provided with {@link #registerTypeAdapterFactory(TypeAdapterFactory)}.
*/
public static final Gson gsonSerializeNullsPrettyPrinting = build(b -> b.serializeNulls().setPrettyPrinting());
@@ -52,8 +59,41 @@ public class Json {
private static Gson build(Function<GsonBuilder, GsonBuilder> builderModifier) {
return builderModifier
.apply(new GsonBuilder().registerTypeAdapterFactory(new RecordAdapterFactory()).setLenient()).create();
GsonBuilder base = new GsonBuilder()
.registerTypeAdapterFactory(new CustomAdapterFactory())
.setLenient();
return builderModifier.apply(base).create();
}
/**
* Adds the provided {@link TypeAdapterFactory} to all the static Gson instances of this class.
* @param factory the factory to add to the
*/
public static void registerTypeAdapterFactory(TypeAdapterFactory factory) {
synchronized (customTypeAdapterFactories) {
customTypeAdapterFactories.add(factory);
}
}
private static final List<TypeAdapterFactory> customTypeAdapterFactories = new ArrayList<>();
private static class CustomAdapterFactory implements TypeAdapterFactory {
@Override
public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> type) {
synchronized (customTypeAdapterFactories) {
for (TypeAdapterFactory actualFactory : customTypeAdapterFactories) {
TypeAdapter<T> adapter = actualFactory.create(gson, type);
if (adapter != null)
return adapter;
}
}
return null;
}
}
@@ -62,6 +102,9 @@ public class Json {
static {
registerTypeAdapterFactory(new RecordAdapterFactory());
}
// from https://github.com/google/gson/issues/1794#issuecomment-812964421
private static class RecordAdapterFactory implements TypeAdapterFactory {