[Add][Change] Core 增加 Converter 并增加对 FactoryName 不允许重复的限制;

[Add] GsonJsonObjectConverter, GsonJsonArrayConverter 增加对 Gson 中 JsonArray, JsonObject 的转换;
[Change] CacheStoreBuilder, FactoryInfo 增加对 FactoryName 的不重复限制, 增加对 FactoryInfo 的 hashCode, equals 方法实现(以 FactoryName 字段为主);
[Add] com.google.code.gson:gson:2.8.5 增加对 Gson 的依赖(解析数据, 后续可能会转移);

ContentGrabbingJi-core/pom.xml

@@ -45,6 +45,12 @@
             <version>3.0.0-alpha-SNAPSHOT</version>
         </dependency>
 
+        <dependency>
+            <groupId>com.google.code.gson</groupId>
+            <artifactId>gson</artifactId>
+            <version>2.8.5</version>
+        </dependency>
+
         <dependency>
             <groupId>net.lamgc</groupId>
             <artifactId>ContentGrabbingJi-CacheStore-local</artifactId>

ContentGrabbingJi-core/src/main/java/net/lamgc/cgj/bot/cache/CacheStoreBuilder.java

@@ -58,6 +58,10 @@ public class CacheStoreBuilder {
                 FactoryInfo info;
                 try {
                     info = new FactoryInfo(factory.getClass());
+                    if (FACTORY_INFO_MAP.containsValue(info)) {
+                        log.warn("发现 Name 重复的 Factory, 已跳过. (被拒绝的实现: {})", factory.getClass().getName());
+                        continue;
+                    }
                     FACTORY_INFO_MAP.put(factory, info);
                 } catch (IllegalArgumentException e) {
                     log.warn("Factory {} 加载失败: {}", factory.getClass().getName(), e.getMessage());

ContentGrabbingJi-core/src/main/java/net/lamgc/cgj/bot/cache/FactoryInfo.java

@@ -19,6 +19,8 @@ package net.lamgc.cgj.bot.cache;
 
 import com.google.common.base.Strings;
 
+import java.util.Objects;
+
 /**
  * CacheStoreFactory 的标识信息.
  * @author LamGC
@@ -62,4 +64,21 @@ public class FactoryInfo {
     public int getFactoryPriority() {
         return factoryPriority;
     }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        FactoryInfo that = (FactoryInfo) o;
+        return factoryName.equals(that.factoryName);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(factoryName);
+    }
 }

ContentGrabbingJi-core/src/main/java/net/lamgc/cgj/bot/cache/converter/GsonJsonArrayConverter.java

@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2020  LamGC
+ *
+ * ContentGrabbingJi is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * ContentGrabbingJi is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package net.lamgc.cgj.bot.cache.converter;
+
+import com.google.gson.Gson;
+import com.google.gson.JsonArray;
+import net.lamgc.cgj.bot.cache.convert.StringConverter;
+
+import java.util.Objects;
+
+/**
+ * Gson 的 JsonArray 转换器.
+ * @author LamGC
+ */
+public class GsonJsonArrayConverter implements StringConverter<JsonArray> {
+
+    private final Gson gson;
+
+    /**
+     * 使用默认配置的 Gson 对象创建转换器.
+     */
+    public GsonJsonArrayConverter() {
+        this(new Gson());
+    }
+
+    /**
+     * 使用自定义的 Gson 对象创建转换器.
+     * @param gson Gson 对象
+     * @throws NullPointerException 如果 gson 参数传入 null, 则抛出该异常.
+     */
+    public GsonJsonArrayConverter(Gson gson) {
+        this.gson = Objects.requireNonNull(gson);
+    }
+
+    @Override
+    public String to(JsonArray source) {
+        return gson.toJson(source);
+    }
+
+    @Override
+    public JsonArray from(String target) {
+        return gson.fromJson(target, JsonArray.class);
+    }
+}

ContentGrabbingJi-core/src/main/java/net/lamgc/cgj/bot/cache/converter/GsonJsonObjectConverter.java

@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2020  LamGC
+ *
+ * ContentGrabbingJi is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * ContentGrabbingJi is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package net.lamgc.cgj.bot.cache.converter;
+
+import com.google.gson.Gson;
+import com.google.gson.JsonObject;
+import net.lamgc.cgj.bot.cache.convert.StringConverter;
+
+import java.util.Objects;
+
+/**
+ * Gson 的 JsonObject 转换器.
+ * @author LamGC
+ */
+public class GsonJsonObjectConverter implements StringConverter<JsonObject> {
+
+    private final Gson gson;
+
+    /**
+     * 使用默认配置的 Gson 对象创建转换器.
+     */
+    public GsonJsonObjectConverter() {
+        this(new Gson());
+    }
+
+    /**
+     * 使用自定义的 Gson 对象创建转换器.
+     * @param gson Gson 对象
+     * @throws NullPointerException 如果 gson 参数传入 null, 则抛出该异常.
+     */
+    public GsonJsonObjectConverter(Gson gson) {
+        this.gson = Objects.requireNonNull(gson);
+    }
+
+    @Override
+    public String to(JsonObject source) {
+        return gson.toJson(source);
+    }
+
+    @Override
+    public JsonObject from(String target) {
+        return gson.fromJson(target, JsonObject.class);
+    }
+}