Refactor Json helper functions to JsonUtils

src/main/java/emu/grasscutter/utils/JsonUtils.java

@@ -0,0 +1,77 @@
+package emu.grasscutter.utils;
+
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.nio.charset.StandardCharsets;
+import java.util.List;
+import java.util.Map;
+
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonSyntaxException;
+import com.google.gson.reflect.TypeToken;
+
+public final class JsonUtils {
+    static final Gson gson = new GsonBuilder().setPrettyPrinting().create();
+
+    @Deprecated(forRemoval = true)
+    public static Gson getGsonFactory() {
+        return gson;
+    }
+
+    /*
+     * Encode an object to a JSON string
+     */
+    public static String encode(Object object) {
+        return gson.toJson(object);
+    }
+
+    public static <T> T decode(JsonElement jsonElement, Class<T> classType) throws JsonSyntaxException {
+        return gson.fromJson(jsonElement, classType);
+    }
+
+    public static <T> T loadToClass(InputStreamReader fileReader, Class<T> classType) throws IOException {
+        return gson.fromJson(fileReader, classType);
+    }
+
+    public static <T> T loadToClass(String filename, Class<T> classType) throws IOException {
+        try (InputStreamReader fileReader = new InputStreamReader(new FileInputStream(Utils.toFilePath(filename)), StandardCharsets.UTF_8)) {
+            return loadToClass(fileReader, classType);
+        }
+    }
+
+    public static <T> List<T> loadToList(InputStreamReader fileReader, Class<T> classType) throws IOException {
+        return gson.fromJson(fileReader, TypeToken.getParameterized(List.class, classType).getType());
+    }
+
+    public static <T> List<T> loadToList(String filename, Class<T> classType) throws IOException {
+        try (InputStreamReader fileReader = new InputStreamReader(new FileInputStream(Utils.toFilePath(filename)), StandardCharsets.UTF_8)) {
+            return loadToList(fileReader, classType);
+        }
+    }
+
+    public static <T1,T2> Map<T1,T2> loadToMap(InputStreamReader fileReader, Class<T1> keyType, Class<T2> valueType) throws IOException {
+        return gson.fromJson(fileReader, TypeToken.getParameterized(Map.class, keyType, valueType).getType());
+    }
+
+    public static <T1,T2> Map<T1,T2> loadToMap(String filename, Class<T1> keyType, Class<T2> valueType) throws IOException {
+        try (InputStreamReader fileReader = new InputStreamReader(new FileInputStream(Utils.toFilePath(filename)), StandardCharsets.UTF_8)) {
+            return loadToMap(fileReader, keyType, valueType);
+        }
+    }
+
+    /**
+     * Safely JSON decodes a given string.
+     * @param jsonData The JSON-encoded data.
+     * @return JSON decoded data, or null if an exception occurred.
+     */
+    public static <T> T decode(String jsonData, Class<T> classType) {
+        try {
+            return gson.fromJson(jsonData, classType);
+        } catch (Exception ignored) {
+            return null;
+        }
+    }
+}