Migrates database.

Adds new sorting fields to notes.
Adds new color field to category.
Adds migration from 4 to 5.

app/src/main/java/org/secuso/privacyfriendlynotes/room/NoteDatabase.java

@@ -47,7 +47,7 @@
 )
 public abstract class NoteDatabase extends RoomDatabase {
 
-    public static final int VERSION = 4;
+    public static final int VERSION = 5;
     public static final String DATABASE_NAME = "allthenotes";
     private static NoteDatabase instance;
 
@@ -93,6 +93,43 @@ public void onCreate(@NonNull SupportSQLiteDatabase db) {
         }
     };
 
+    static final Migration MIGRATION_4_5 = new Migration(4,5) {
+
+        @Override
+        public void migrate(@NonNull SupportSQLiteDatabase database) {
+
+            // Adds new color field
+            database.execSQL("ALTER TABLE categories ADD COLUMN color TEXT");
+
+            // Adds new fields to sort by
+            database.execSQL(
+                    "CREATE TABLE notes_new (_id INTEGER NOT NULL DEFAULT 0,"
+                    + "in_trash INTEGER NOT NULL DEFAULT 0,"
+                    + "name TEXT NOT NULL DEFAULT 'TEXT',"
+                    + "type INTEGER NOT NULL DEFAULT 0,"
+                    + "category INTEGER NOT NULL DEFAULT 0,"
+                    + "content TEXT NOT NULL DEFAULT 'TEXT',"
+                    + "last_modified TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,"
+                    + "custom_order INTEGER NOT NULL DEFAULT 0,"
+                    + "PRIMARY KEY(_id));");
+            database.execSQL("INSERT INTO notes_new(_id, in_trash,name,type,category,content,custom_order) SELECT _id, in_trash,name,type,category,content,_id as custom_order FROM notes ORDER BY _id ASC;");
+            database.execSQL("DROP TABLE notes;");
+            database.execSQL("ALTER TABLE notes_new RENAME TO notes");
+            database.execSQL(
+                    "CREATE TRIGGER [UpdateLastModified] AFTER UPDATE ON notes FOR EACH ROW WHEN NEW.last_modified = OLD.last_modified " +
+                        "BEGIN " +
+                            "UPDATE notes SET last_modified = DateTime('now') WHERE _id=NEW._id; " +
+                        "END;"
+            );
+            database.execSQL(
+                    "CREATE TRIGGER [InsertCustomOrder] AFTER INSERT ON notes FOR EACH ROW " +
+                            "BEGIN " +
+                            "UPDATE notes SET custom_order = _id WHERE _id=NEW._id; " +
+                            "END;"
+            );
+        }
+    };
+
     /**
      * Provides data migration from database version 3 to 4 which checks for an error in the previous
      * migration when a backup was imported
@@ -233,6 +270,7 @@ public void migrate(SupportSQLiteDatabase database) {
             MIGRATION_1_2,
             MIGRATION_1_3,
             MIGRATION_2_3,
-            MIGRATION_3_4
+            MIGRATION_3_4,
+            MIGRATION_4_5
     };
 }

app/src/main/java/org/secuso/privacyfriendlynotes/room/model/Category.kt

@@ -24,11 +24,19 @@ import androidx.room.PrimaryKey
 data class Category(
         @PrimaryKey(autoGenerate = true)
         val _id: Int,
-        val name: String) {
+        val name: String,
+        val color: String?
+) {
 
-        constructor(name: String) : this(
+        constructor(name: String): this(
                 name = name,
-                _id = 0
+                _id = 0,
+                color = null
+        )
+        constructor(name: String, color: String?) : this(
+                name = name,
+                _id = 0,
+                color = color
         )
 
 }

app/src/main/java/org/secuso/privacyfriendlynotes/room/model/Note.kt

@@ -13,8 +13,11 @@
  */
 package org.secuso.privacyfriendlynotes.room.model
 
+import androidx.room.ColumnInfo
 import androidx.room.Entity
 import androidx.room.PrimaryKey
+import java.time.Instant
+import java.util.Calendar
 
 /**
  * Provides note class with variables and constructor.
@@ -28,14 +31,20 @@ data class Note(
         var content: String,
         var type: Int,
         var category: Int,
-        var in_trash: Int = 0) {
+        var in_trash: Int = 0,
+        @ColumnInfo(defaultValue = "CURRENT_TIMESTAMP")
+        var last_modified: String,
+        var custom_order: Int
+) {
 
         constructor(name: String, content: String, type: Int, category: Int) : this(
                 name = name,
                 content = content,
                 type = type,
                 category = category,
                 in_trash = 0,
-                _id = 0
+                _id = 0,
+                last_modified = Calendar.getInstance().time.toString(),
+                custom_order = 0
         )
 }