1 files changed, 53 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/storage/Storage.java b/src/main/java/org/traccar/storage/Storage.java
new file mode 100644
index 000000000..55f5c22c0
--- /dev/null
+++ b/src/main/java/org/traccar/storage/Storage.java
@@ -0,0 +1,53 @@
+/*
+ * Copyright 2022 Anton Tananaev (anton@traccar.org)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.storage;
+
+import org.traccar.model.BaseModel;
+import org.traccar.model.Permission;
+import org.traccar.storage.query.Request;
+
+import java.util.List;
+
+public abstract class Storage {
+
+    public abstract <T> List<T> getObjects(Class<T> clazz, Request request) throws StorageException;
+
+    public abstract <T> long addObject(T entity, Request request) throws StorageException;
+
+    public abstract <T> void updateObject(T entity, Request request) throws StorageException;
+
+    public abstract void removeObject(Class<?> clazz, Request request) throws StorageException;
+
+    public abstract List<Permission> getPermissions(
+            Class<? extends BaseModel> ownerClass, long ownerId,
+            Class<? extends BaseModel> propertyClass, long propertyId) throws StorageException;
+
+    public abstract void addPermission(Permission permission) throws StorageException;
+
+    public abstract void removePermission(Permission permission) throws StorageException;
+
+    public List<Permission> getPermissions(
+            Class<? extends BaseModel> ownerClass,
+            Class<? extends BaseModel> propertyClass) throws StorageException {
+        return getPermissions(ownerClass, 0, propertyClass, 0);
+    }
+
+    public <T> T getObject(Class<T> clazz, Request request) throws StorageException {
+        var objects = getObjects(clazz, request);
+        return objects.isEmpty() ? null : objects.get(0);
+    }
+
+}