net.minecraftforge.gradle.json.EnumAdaptorFactory Maven / Gradle / Ivy

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package net.minecraftforge.gradle.json;

import java.io.IOException;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;

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;

public class EnumAdaptorFactory implements TypeAdapterFactory
{

    @SuppressWarnings("unchecked")
    @Override
    public  TypeAdapter create(Gson gson, TypeToken type)
    {
        if (!type.getRawType().isEnum()) return null;
        final Map map = new HashMap();
        for (T c : (T[])type.getRawType().getEnumConstants())
        {
            map.put(c.toString().toLowerCase(Locale.US), c);
        }

        return new TypeAdapter()
        {
            @Override
            public T read(JsonReader reader) throws IOException
            {
                if (reader.peek() == JsonToken.NULL)
                {
                    reader.nextNull();
                    return null;
                }
                String name = reader.nextString();
                if (name == null) return null;
                return map.get(name.toLowerCase(Locale.US));
            }

            @Override
            public void write(JsonWriter writer, T value) throws IOException
            {
                if (value == null)
                {
                    writer.nullValue();
                }
                else
                {
                    writer.value(value.toString().toLowerCase(Locale.US));
                }
            }
        };
    }
}