add setting and getting config in json format

src/main/java/net/discordjug/javabot/RuntimeHintsConfiguration.java

@@ -68,8 +68,8 @@ public void registerHints(RuntimeHints hints, ClassLoader classLoader) {
 			for(Class<?> cl : getClass().getClassLoader().loadClass("sun.font.FontConfigManager").getDeclaredClasses()) {
 				hints.jni().registerType(cl, MemberCategory.ACCESS_DECLARED_FIELDS, MemberCategory.INVOKE_DECLARED_CONSTRUCTORS);
 			}
-		} catch (ClassNotFoundException e) {
-			throw new RuntimeException(e);
+		} catch (ClassNotFoundException _) {
+            // FontConfigManager is only supported on Linux
 		}
 
 		for (Class<?> cl : WebhookEmbed.class.getClasses()) {

src/main/java/net/discordjug/javabot/SpringConfig.java

@@ -4,7 +4,11 @@
 import java.util.Collection;
 import java.util.concurrent.Executors;
 import java.util.concurrent.ScheduledExecutorService;
+import java.util.regex.Pattern;
 
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import net.discordjug.javabot.data.config.PatternTypeAdapter;
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
@@ -90,4 +94,13 @@ BotConfig botConfig() {
 		}
 		return botConfig;
 	}
+
+	@Bean
+	Gson gson() {
+		return new GsonBuilder()
+				.serializeNulls()
+				.setPrettyPrinting()
+				.registerTypeAdapter(Pattern.class, new PatternTypeAdapter())
+				.create();
+	}
 }

src/main/java/net/discordjug/javabot/data/config/GuildConfig.java

@@ -167,7 +167,10 @@ public void set(String propertyName, String value) throws UnknownPropertyExcepti
 		Optional<Pair<Field, Object>> result = ReflectionUtils.resolveField(propertyName, this);
 		result.ifPresent(pair -> {
 			try {
-				ReflectionUtils.set(pair.first(), pair.second(), value);
+				Field updatedField = ReflectionUtils.set(pair.first(), pair.second(), value);
+				if (updatedField.get(pair.second()) instanceof GuildConfigItem) {
+					((GuildConfigItem) updatedField.get(pair.second())).setGuildConfig(this);
+				}
 				this.flush();
 			} catch (IllegalAccessException e) {
 				ExceptionLogger.capture(e, getClass().getSimpleName());

src/main/java/net/discordjug/javabot/data/config/ReflectionUtils.java

@@ -1,5 +1,7 @@
 package net.discordjug.javabot.data.config;
 
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
 import lombok.extern.slf4j.Slf4j;
 import net.discordjug.javabot.util.ExceptionLogger;
 import net.discordjug.javabot.util.Pair;
@@ -14,13 +16,19 @@
 import java.util.Map;
 import java.util.Optional;
 import java.util.function.Function;
+import java.util.regex.Pattern;
 
 /**
  * Utility class for resolving JSON files.
  */
 @Slf4j
 public class ReflectionUtils {
 	private static final Map<Class<?>, Function<String, Object>> propertyTypeParsers = new HashMap<>();
+	private static final Gson gson = new GsonBuilder()
+			.serializeNulls()
+			.setPrettyPrinting()
+			.registerTypeAdapter(Pattern.class, new PatternTypeAdapter())
+			.create();
 
 	static {
 		propertyTypeParsers.put(Integer.class, Integer::parseInt);
@@ -126,13 +134,11 @@ private static Field findDeclaredField(Class<?> cl, String name) throws NoSuchFi
 	 * @param field  The field to set.
 	 * @param parent The object whose property value to set.
 	 * @param s      The string representation of the value.
+	 * @return Returns the edited {@link Field}.
 	 * @throws IllegalAccessException If the field cannot be set.
 	 */
-	public static void set(@NotNull Field field, @NotNull Object parent, @NotNull String s) throws IllegalAccessException {
-		Function<String, Object> parser = propertyTypeParsers.get(field.getType());
-		if (parser == null) {
-			throw new IllegalArgumentException("No supported property type parser for the type " + field.getType().getSimpleName());
-		}
-		field.set(parent, parser.apply(s));
+	public static Field set(@NotNull Field field, @NotNull Object parent, @NotNull String s) throws IllegalAccessException {
+		field.set(parent, gson.fromJson(s, field.getType()));
+		return field;
 	}
 }

src/main/java/net/discordjug/javabot/listener/filter/MessageRuleFilter.java

@@ -11,14 +11,11 @@
 import java.time.Duration;
 import java.util.Base64;
 import java.util.List;
-import java.util.regex.Pattern;
 import java.util.stream.Collectors;
 
 import com.google.gson.Gson;
-import com.google.gson.GsonBuilder;
 import lombok.RequiredArgsConstructor;
 import net.discordjug.javabot.data.config.BotConfig;
-import net.discordjug.javabot.data.config.PatternTypeAdapter;
 import net.discordjug.javabot.data.config.guild.MessageRule;
 import net.discordjug.javabot.data.config.guild.MessageRule.MessageAction;
 import net.discordjug.javabot.data.config.guild.ModerationConfig;
@@ -41,6 +38,7 @@ public class MessageRuleFilter implements MessageFilter {
 
 	private final BotConfig botConfig;
 	private final MessageCache messageCache;
+	private final Gson gson;
 
 	@Override
 	public MessageModificationStatus processMessage(MessageContent content) {
@@ -73,11 +71,6 @@ public MessageModificationStatus processMessage(MessageContent content) {
 	}
 
 	private void log(MessageContent content, MessageRule ruleToExecute, ModerationConfig moderationConfig) {
-		Gson gson = new GsonBuilder()
-				.serializeNulls()
-				.setPrettyPrinting()
-				.registerTypeAdapter(Pattern.class, new PatternTypeAdapter())
-				.create();
 		EmbedBuilder embed = messageCache.buildMessageCacheEmbed(
 				content.event().getMessage().getChannel(),
 				content.event().getMessage().getAuthor(),

src/main/java/net/discordjug/javabot/systems/configuration/GetConfigSubcommand.java

@@ -1,5 +1,6 @@
 package net.discordjug.javabot.systems.configuration;
 
+import com.google.gson.Gson;
 import net.discordjug.javabot.data.config.BotConfig;
 import net.discordjug.javabot.data.config.GuildConfig;
 import net.discordjug.javabot.data.config.UnknownPropertyException;
@@ -19,15 +20,20 @@
  * Subcommand that allows staff-members to get a single property variable from the guild config.
  */
 public class GetConfigSubcommand extends ConfigSubcommand implements AutoCompletable {
+
+	private final Gson gson;
+
 	/**
 	 * The constructor of this class, which sets the corresponding {@link SubcommandData}.
 	 * @param botConfig The main configuration of the bot
+	 * @param gson Mapper used for displaying config as json
 	 */
-	public GetConfigSubcommand(BotConfig botConfig) {
+	public GetConfigSubcommand(BotConfig botConfig, Gson gson) {
 		super(botConfig);
 		setCommandData(new SubcommandData("get", "Get the current value of a configuration property.")
 				.addOption(OptionType.STRING, "property", "The name of a property.", true, true)
 		);
+		this.gson = gson;
 	}
 
 	@Override
@@ -38,7 +44,8 @@ public ReplyCallbackAction handleConfigSubcommand(@Nonnull SlashCommandInteracti
 		}
 		String property = propertyOption.getAsString().trim();
 		Object value = config.resolve(property);
-		return Responses.info(event, "Configuration Property", "The value of the property `%s` is:\n```\n%s\n```", property, value);
+		String json = gson.toJson(value);
+		return Responses.info(event, "Configuration Property", "The value of the property `%s` is:\n```\n%s\n```", property, json);
 	}
 
 	@Override

src/main/java/net/discordjug/javabot/systems/configuration/SetConfigSubcommand.java

@@ -1,5 +1,6 @@
 package net.discordjug.javabot.systems.configuration;
 
+import com.google.gson.Gson;
 import net.discordjug.javabot.annotations.AutoDetectableComponentHandler;
 import net.discordjug.javabot.data.config.BotConfig;
 import net.discordjug.javabot.data.config.GuildConfig;
@@ -31,16 +32,21 @@
  */
 @AutoDetectableComponentHandler("config-set")
 public class SetConfigSubcommand extends ConfigSubcommand implements ModalHandler, AutoCompletable {
+
+	private final Gson gson;
+
 	/**
 	 * The constructor of this class, which sets the corresponding {@link SubcommandData}.
 	 * @param botConfig The main configuration of the bot
+	 * @param gson Mapper used for displaying config as json
 	 */
-	public SetConfigSubcommand(BotConfig botConfig) {
+	public SetConfigSubcommand(BotConfig botConfig, Gson gson) {
 		super(botConfig);
 		setCommandData(new SubcommandData("set", "Sets the value of a configuration property.")
 				.addOption(OptionType.STRING, "property", "The name of a property.", true, true)
 				.addOption(OptionType.STRING, "value", "The value to set for the property.", false)
 		);
+		this.gson = gson;
 	}
 
 	@Override
@@ -57,10 +63,11 @@ public InteractionCallbackAction<?> handleConfigSubcommand(@Nonnull SlashCommand
 			if (resolved == null) {
 				return Responses.error(event, "Config `%s` not found", property);
 			}
+			String json = gson.toJson(resolved);
 			return event.replyModal(
 					Modal.create(ComponentIdBuilder.build("config-set", property), "Change configuration value")
 					.addComponents(Label.of("new value", TextInput.create("value", TextInputStyle.PARAGRAPH)
-							.setValue(String.valueOf(resolved))
+							.setValue(json)
 							.build()))
 				.build());
 		}