feat: 优化

app/src/main/java/io/legado/app/data/entities/BaseBook.kt

@@ -4,7 +4,7 @@ import io.legado.app.utils.splitNotBlank
 
 interface BaseBook {
     var bookUrl: String
-    var variableMap: HashMap<String, String>?
+    val variableMap: HashMap<String, String>
     var kind: String?
     var wordCount: String?
 

app/src/main/java/io/legado/app/data/entities/Book.kt

@@ -71,14 +71,15 @@ data class Book(
         return bookUrl.hashCode()
     }
 
-    @Ignore
+    @delegate:Ignore
     @IgnoredOnParcel
-    override var variableMap: HashMap<String, String>? = null
-        get() {
-            if (field == null) {
-                field = GSON.fromJsonObject<HashMap<String, String>>(variable) ?: HashMap()
+    override val variableMap by lazy {
+        GSON.fromJsonObject<HashMap<String, String>>(variable) ?: HashMap()
     }
-            return field
+
+    override fun putVariable(key: String, value: String) {
+        variableMap[key] = value
+        variable = GSON.toJson(variableMap)
     }
 
     @Ignore
@@ -97,11 +98,6 @@ data class Book(
 
     fun getDisplayIntro() = if (customIntro.isNullOrEmpty()) intro else customIntro
 
-    override fun putVariable(key: String, value: String) {
-        variableMap?.put(key, value)
-        variable = GSON.toJson(variableMap)
-    }
-
     fun fileCharset(): Charset {
         return charset(charset ?: "UTF-8")
     }

app/src/main/java/io/legado/app/data/entities/SearchBook.kt

@@ -63,18 +63,14 @@ data class SearchBook(
         return other.originOrder - this.originOrder
     }
 
-    @Ignore
+    @delegate:Ignore
     @IgnoredOnParcel
-    override var variableMap: HashMap<String, String>? = null
-        get() {
-            if (field == null) {
-                field = GSON.fromJsonObject<HashMap<String, String>>(variable) ?: HashMap()
-            }
-            return field
+    override val variableMap by lazy {
+        GSON.fromJsonObject<HashMap<String, String>>(variable) ?: HashMap()
     }
 
     override fun putVariable(key: String, value: String) {
-        variableMap?.put(key, value)
+        variableMap[key] = value
         variable = GSON.toJson(variableMap)
     }