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A library for Tink core services

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package com.tink.rest.tools;

import com.squareup.moshi.JsonAdapter;
import com.squareup.moshi.Moshi;
import com.squareup.moshi.Types;
import com.squareup.moshi.adapters.EnumJsonAdapter;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.Set;

/**
 * Provides EnumJsonAdapters which fallback for UNKNOWN or OTHER. If those values are not present in
 * the enum, no adapter will be created
 */
class TinkEnumJsonAdapterFactory implements JsonAdapter.Factory {

	@Override
	public JsonAdapter create(Type type, Set annotations, Moshi moshi) {

		Class rawType = Types.getRawType(type);

		if (rawType.isEnum()) {

			Class enumClass = (Class) rawType;
			Enum[] values = enumClass.getEnumConstants();

			Enum fallback = null;
			for (Enum e : values) {
				if (e.name().equals("UNKNOWN") || e.name().equals("OTHER")) {
					fallback = e;
					break;
				}
			}

			if (fallback != null) {
				//noinspection unchecked
				return EnumJsonAdapter.create(enumClass).withUnknownFallback(fallback);
			}
		}
		return null;
	}
}