1 files changed, 42 insertions, 0 deletions
diff --git a/src/main/java/io/github/moulberry/notenoughupdates/util/JsonUtils.java b/src/main/java/io/github/moulberry/notenoughupdates/util/JsonUtils.java
new file mode 100644
index 00000000..916631b7
--- /dev/null
+++ b/src/main/java/io/github/moulberry/notenoughupdates/util/JsonUtils.java
@@ -0,0 +1,42 @@
+package io.github.moulberry.notenoughupdates.util;
+
+import com.google.gson.JsonArray;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.function.Function;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+import java.util.stream.StreamSupport;
+
+public class JsonUtils {
+	public static Stream<JsonElement> getJsonArrayAsStream(JsonArray array) {
+		return StreamSupport.stream(array.spliterator(), false);
+	}
+
+	public static <T> List<T> transformJsonArrayToList(JsonArray array, Function<? super JsonElement, ? extends T> mapper) {
+		return getJsonArrayAsStream(array).map(mapper).collect(Collectors.toList());
+	}
+
+	public static <T> List<T> getJsonArrayOrEmpty(JsonObject rootObject, String name, Function<? super JsonElement, ? extends T> mapper) {
+		if (!rootObject.has(name)) {
+			return Collections.emptyList();
+		}
+		JsonElement jsonElement = rootObject.get(name);
+		if (jsonElement.isJsonArray()) {
+			return transformJsonArrayToList(jsonElement.getAsJsonArray(), mapper);
+		}
+		return Collections.emptyList();
+	}
+
+	public static <T> JsonArray transformListToJsonArray(List<T> things, Function<? super T, ? extends JsonElement> mapper) {
+		JsonArray array = new JsonArray();
+		for (T t : things) {
+			array.add(mapper.apply(t));
+		}
+		return array;
+	}
+
+}