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Addd GSON enum type adapter for compatibility with Mohist

Browse Source 
https://github.com/BentoBoxWorld/BentoBox/issues/1766
This commit is contained in:
tastybento 2021-05-28 17:24:51 -07:00
parent e472e07c34
commit bedeb7c168
2 changed files with 65 additions and 1 deletions
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5
src/main/java/world/bentobox/bentobox/database/json/BentoboxTypeAdapterFactory.java
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@ -17,6 +17,7 @@ import com.google.gson.reflect.TypeToken;
import world.bentobox.bentobox.BentoBox;
import world.bentobox.bentobox.api.flags.Flag;
import world.bentobox.bentobox.database.json.adapters.BukkitObjectTypeAdapter;
import world.bentobox.bentobox.database.json.adapters.EnumTypeAdapter;
import world.bentobox.bentobox.database.json.adapters.FlagTypeAdapter;
import world.bentobox.bentobox.database.json.adapters.ItemStackTypeAdapter;
import world.bentobox.bentobox.database.json.adapters.LocationTypeAdapter;
@ -44,13 +45,15 @@ public class BentoboxTypeAdapterFactory implements TypeAdapterFactory {
/* (non-Javadoc)
* @see com.google.gson.TypeAdapterFactory#create(com.google.gson.Gson, com.google.gson.reflect.TypeToken)
*/
@SuppressWarnings("unchecked")
@SuppressWarnings({ "unchecked", "rawtypes" })
@Override
public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> type) {
Class<?> rawType = type.getRawType();
if (Location.class.isAssignableFrom(rawType)) {
// Use our current location adapter for backward compatibility
return (TypeAdapter<T>) new LocationTypeAdapter();
} else if (Enum.class.isAssignableFrom(rawType)) {
return new EnumTypeAdapter(rawType);
} else if (ItemStack.class.isAssignableFrom(rawType)) {
// Use our current location adapter for backward compatibility
return (TypeAdapter<T>) new ItemStackTypeAdapter();

61
src/main/java/world/bentobox/bentobox/database/json/adapters/EnumTypeAdapter.java Normal file
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@ -0,0 +1,61 @@
package world.bentobox.bentobox.database.json.adapters;
import java.io.IOException;
import java.util.Arrays;
import com.google.common.collect.BiMap;
import com.google.common.collect.HashBiMap;
import com.google.gson.TypeAdapter;
import com.google.gson.annotations.SerializedName;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonToken;
import com.google.gson.stream.JsonWriter;
/**
* @author tastybento
*
* @param <T> enum class to be serialized
*/
public final class EnumTypeAdapter<T extends Enum<T>> extends TypeAdapter<T> {
/**
* Bimap to store name <-> enum references
*/
private final BiMap<String, T> enumMap = HashBiMap.create();
public EnumTypeAdapter(Class<T> enumClass) {
for (T value : enumClass.getEnumConstants()) {
String name = value.name();
try {
SerializedName annotation = enumClass.getField(name).getAnnotation(SerializedName.class);
if (annotation != null) {
Arrays.stream(annotation.alternate()).forEach(s -> enumMap.put(s, value));
// Reset name
name = annotation.value();
}
} catch (NoSuchFieldException e) {
// Ignore
}
enumMap.put(name, value);
}
}
@Override public T read(JsonReader input) throws IOException {
if (JsonToken.NULL.equals(input.peek())) {
input.nextNull();
return null;
}
return enumMap.get(input.nextString());
}
@Override public void write(JsonWriter output, T enumValue) throws IOException {
output.value(enumValue != null ? enumMap.inverse().get(enumValue) : null);
}
}