[Add] MessageSenderBuilder, MessageSenderFactory 增加用于创建MessageSender而又与平台无关的Builder, 初步增加对应Factory;

src/main/java/net/lamgc/cgj/bot/CQPluginMain.java

@@ -16,6 +16,8 @@ import org.springframework.stereotype.Component;
 public class CQPluginMain extends CQPlugin implements EventHandler {
 
     public CQPluginMain() {
+        // TODO(LamGC, 2020.04.21): SpringCQ无法适配MessageSenderBuilder
+        BotEventHandler.preLoad();
         LoggerFactory.getLogger(this.toString())
                 .info("BotEventHandler.COMMAND_PREFIX = {}", BotEventHandler.COMMAND_PREFIX);
     }

src/main/java/net/lamgc/cgj/bot/MiraiMain.java

@@ -2,6 +2,8 @@ package net.lamgc.cgj.bot;
 
 import net.lamgc.cgj.bot.event.BotEventHandler;
 import net.lamgc.cgj.bot.event.MiraiMessageEvent;
+import net.lamgc.cgj.bot.message.MessageSenderBuilder;
+import net.lamgc.cgj.bot.message.MiraiMessageSenderFactory;
 import net.mamoe.mirai.Bot;
 import net.mamoe.mirai.japt.Events;
 import net.mamoe.mirai.message.FriendMessage;
@@ -44,6 +46,8 @@ public class MiraiMain implements Closeable {
         Events.subscribeAlways(GroupMessage.class, (msg) -> BotEventHandler.executor.executor(new MiraiMessageEvent(msg)));
         Events.subscribeAlways(FriendMessage.class, (msg) -> BotEventHandler.executor.executor(new MiraiMessageEvent(msg)));
         bot.login();
+        MessageSenderBuilder.setCurrentMessageSenderFactory(new MiraiMessageSenderFactory(bot));
+        BotEventHandler.preLoad();
         bot.join();
     }
 

src/main/java/net/lamgc/cgj/bot/message/MessageSenderBuilder.java

@@ -0,0 +1,43 @@
+package net.lamgc.cgj.bot.message;
+
+import java.util.concurrent.atomic.AtomicReference;
+
+/**
+ * 消息发送器构造
+ */
+public final class MessageSenderBuilder {
+
+    private final static AtomicReference<MessageSenderFactory> currentFactory = new AtomicReference<>();
+
+    private MessageSenderBuilder() {}
+
+    /**
+     * 获取消息发送器
+     * @param source 消息源类型
+     * @param id 消息源Id
+     * @return 返回新建的发送器
+     */
+    public static MessageSender getMessageSender(MessageSource source, long id) {
+        MessageSenderFactory messageSenderFactory = currentFactory.get();
+        if(messageSenderFactory == null) {
+            throw new IllegalStateException("The factory is not ready");
+        }
+        try {
+            return messageSenderFactory.createMessageSender(source, id);
+        } catch (Exception e) {
+            throw new IllegalStateException(e);
+        }
+    }
+
+    /**
+     * 设置消息发送器工厂
+     * @param factory 工厂对象
+     */
+    public static void setCurrentMessageSenderFactory(MessageSenderFactory factory) {
+        if(currentFactory.get() != null) {
+            throw new IllegalStateException("Factory already exists");
+        }
+        currentFactory.set(factory);
+    }
+
+}

src/main/java/net/lamgc/cgj/bot/message/MessageSenderFactory.java

@@ -0,0 +1,13 @@
+package net.lamgc.cgj.bot.message;
+
+public interface MessageSenderFactory {
+
+    /**
+     * 通过Id创建发送器
+     * @param source 消息源
+     * @param id 消息源id
+     * @return 如果成功返回MessageSender
+     */
+    MessageSender createMessageSender(MessageSource source, long id) throws Exception;
+
+}

src/main/java/net/lamgc/cgj/bot/message/MiraiMessageSenderFactory.java

@@ -0,0 +1,25 @@
+package net.lamgc.cgj.bot.message;
+
+import net.mamoe.mirai.Bot;
+
+public class MiraiMessageSenderFactory implements MessageSenderFactory {
+
+    private final Bot bot;
+
+    public MiraiMessageSenderFactory(Bot bot) {
+        this.bot = bot;
+    }
+
+    @Override
+    public MessageSender createMessageSender(MessageSource source, long id) throws Exception {
+        switch(source) {
+            case Group:
+            case Discuss:
+                return new MiraiMessageSender(bot.getGroup(id), source);
+            case Private:
+                return new MiraiMessageSender(bot.getFriend(id), source);
+            default:
+                throw new NoSuchFieldException(source.toString());
+        }
+    }
+}

src/main/java/net/lamgc/cgj/bot/message/SpringCQMessageSenderFactory.java

@@ -0,0 +1,17 @@
+package net.lamgc.cgj.bot.message;
+
+import net.lz1998.cq.robot.CoolQ;
+
+public class SpringCQMessageSenderFactory implements MessageSenderFactory {
+
+    private final CoolQ coolQ;
+
+    public SpringCQMessageSenderFactory(CoolQ coolQ) {
+        this.coolQ = coolQ;
+    }
+
+    @Override
+    public MessageSender createMessageSender(MessageSource source, long id) {
+        return new SpringCQMessageSender(coolQ, source, id);
+    }
+}