feat: create ObjectStorageConnector.java

src/main/java/de/codemakers/database/connectors/ObjectStorageConnector.java

@@ -0,0 +1,67 @@
+/*
+ *    Copyright 2021 Paul Hagedorn (Panzer1119)
+ *
+ *    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 de.codemakers.database.connectors;
+
+import de.codemakers.base.util.tough.ToughFunction;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+import java.io.InputStream;
+import java.util.Objects;
+import java.util.Optional;
+
+public abstract class ObjectStorageConnector<C> {
+
+    private static final Logger logger = LogManager.getLogger(ObjectStorageConnector.class);
+
+    protected final C connector;
+
+    protected ObjectStorageConnector(C connector) {
+        this.connector = Objects.requireNonNull(connector, "connector may not be null");
+    }
+
+    protected C getConnector() {
+        return connector;
+    }
+
+    public abstract boolean existsObject(String bucket, String object);
+
+    public abstract Optional<byte[]> readObjectBytes(String bucket, String object);
+
+    public abstract Optional<InputStream> readObject(String bucket, String object);
+
+    public abstract <R> Optional<R> readObject(String bucket, String object, ToughFunction<byte[], R> converter);
+
+    public abstract boolean writeObject(String bucket, String object, byte[] data);
+
+    public abstract boolean writeObject(String bucket, String object, InputStream inputStream);
+
+    public abstract boolean deleteObject(String bucket, String object);
+
+    public boolean copyObject(String srcBucket, String srcObject, String destObject) {
+        return copyObject(srcBucket, srcObject, srcBucket, destObject);
+    }
+
+    public abstract boolean copyObject(String srcBucket, String srcObject, String destBucket, String destObject);
+
+    public boolean moveObject(String srcBucket, String srcObject, String destObject) {
+        return moveObject(srcBucket, srcObject, srcBucket, destObject);
+    }
+
+    public abstract boolean moveObject(String srcBucket, String srcObject, String destBucket, String destObject);
+
+}