1 files changed, 55 insertions, 0 deletions
diff --git a/src/main/kotlin/util/GsonUtil.kt b/src/main/kotlin/util/GsonUtil.kt
new file mode 100644
index 0000000..d689330
--- /dev/null
+++ b/src/main/kotlin/util/GsonUtil.kt
@@ -0,0 +1,55 @@
+package moe.nea.ultranotifier.util
+
+import com.google.gson.GsonBuilder
+import com.google.gson.TypeAdapter
+import com.google.gson.reflect.TypeToken
+import com.google.gson.stream.JsonReader
+import com.google.gson.stream.JsonWriter
+import moe.nea.ultranotifier.datamodel.CategoryId
+import moe.nea.ultranotifier.datamodel.ChatPattern
+import moe.nea.ultranotifier.datamodel.ChatTypeId
+import net.minecraft.util.Identifier
+import util.KotlinTypeAdapterFactory
+import java.io.File
+
+object GsonUtil {
+	val sharedGsonBuilder = GsonBuilder()
+		.registerTypeAdapterFactory(KotlinTypeAdapterFactory())
+		.registerTypeHierarchyAdapter(Identifier::class.java, object : TypeAdapter<Identifier>() {
+			override fun write(out: JsonWriter, value: Identifier) {
+				out.value(value.namespace + ":" + value.path)
+			}
+
+			override fun read(`in`: JsonReader): Identifier {
+				val identifierName = `in`.nextString()
+				val parts = identifierName.split(":")
+				require(parts.size != 2) { "$identifierName is not a valid identifier" }
+				return identifier(parts[0], parts[1])
+			}
+		}.nullSafe())
+		.registerTypeHierarchyAdapter(ChatPattern::class.java, stringWrapperAdapter(ChatPattern::text, ::ChatPattern))
+		.registerTypeHierarchyAdapter(CategoryId::class.java, stringWrapperAdapter(CategoryId::id, ::CategoryId))
+		.registerTypeHierarchyAdapter(ChatTypeId::class.java, stringWrapperAdapter(ChatTypeId::id, ::ChatTypeId))
+
+	private fun <T> stringWrapperAdapter(from: (T) -> String, to: (String) -> T): TypeAdapter<T> {
+		return object : TypeAdapter<T>() {
+			override fun write(out: JsonWriter, value: T) {
+				out.value(from(value))
+			}
+
+			override fun read(`in`: JsonReader): T {
+				return to(`in`.nextString())
+			}
+		}.nullSafe()
+	}
+
+	inline fun <reified T : Any> read(meta: File): T {
+		// TODO: add exception
+		meta.reader().use { reader ->
+			return gson.fromJson(reader, object : TypeToken<T>() {}.type)
+		}
+	}
+
+	val gson = sharedGsonBuilder.create()
+	val prettyGson = sharedGsonBuilder.setPrettyPrinting().create()
+}