feat: ChatData 序列化 json化

entry/src/main/cangjie/src/support/support_database/PreferenceStore.cj

@@ -0,0 +1,17 @@
+/**
+ * Created on 2024/9/19
+ */
+package ohos_app_cangjie_entry.support.support_database
+
+import ohos.preferences.*
+internal import ohos.ability.*
+internal import ohos.window.*
+import ohos.base.*
+
+public class PreferencesStore {
+    private let context: AbilityContext
+    public init(context: AbilityContext) {
+        this.context = context
+
+    }
+}

entry/src/main/cangjie/src/types/ChatData.cj

@@ -3,12 +3,48 @@
  */
 package ohos_app_cangjie_entry.types
 
-public class ChatData {
+import serialization.serialization.*
+import std.math.*
+import encoding.json.*
+
+public class ChatData <: Serializable<ChatData> {
     public ChatData(public let id!: String, public let message!: String, public let source!: String) {}
 
     public operator func ==(right: ChatData) {
-        return (this.id == right.id
+        return (
+               this.id == right.id
             && this.message == right.message
-            && this.source == right.source)
+            && this.source == right.source
+        )
+    }
+
+    public func serialize(): DataModel {
+        return (
+            DataModelStruct()
+            .add(field<String>('id', id))
+            .add(field<String>('message', message))
+            .add(field<String>('source', source))
+        )
+    }
+
+    public static func deserialize(dm: DataModel): ChatData {
+        let dms = match (dm) {
+            case data: DataModelStruct => data
+            case _ => throw Exception("this data is not DataModelStruct")
+        }
+        ChatData(
+            id: String.deserialize(dms.get('id')),
+            message: String.deserialize(dms.get('message')),
+            source: String.deserialize(dms.get('source')),
+        )
+    }
+
+    public func toString(): String {
+        this.serialize().toJson().toString()
+    }
+
+    public static func fromString(s: String): ChatData {
+        let jsonObj = JsonValue.fromStr(s)
+        ChatData.deserialize(DataModel.fromJson(jsonObj))
     }
 }