Adding repository storage API

archiva-modules/archiva-base/archiva-repository-api/src/main/java/org/apache/archiva/repository/content/RepositoryStorage.java

@@ -0,0 +1,91 @@
+package org.apache.archiva.repository.content;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ */
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.function.Consumer;
+
+/**
+ * Repository storage gives access to the files and directories on the storage.
+ * The storage may be on a filesystem but can be any other storage system.
+ *
+ * This API is low level repository access. If you use this API you must
+ * either have knowledge about the specific repository layout or use the structure
+ * as it is, e.g. for browsing.
+ *
+ * It is the decision of the implementation, if this API provides access to all elements, or
+ * just a selected view.
+ *
+ * Checking access is not part of this API.
+ */
+public interface RepositoryStorage {
+    /**
+     * Returns information about a specific storage asset.
+     * @param path
+     * @return
+     */
+    StorageAsset getAsset(String path);
+
+    /**
+     * Consumes the data and sets a lock for the file during the operation.
+     *
+     * @param asset
+     * @param consumerFunction
+     * @param readLock
+     * @throws IOException
+     */
+    void consumeData(StorageAsset asset, Consumer<InputStream> consumerFunction, boolean readLock) throws IOException;
+
+    /**
+     * Adds a new asset to the underlying storage.
+     * @param path The path to the asset.
+     * @param container True, if the asset should be a container, false, if it is a file.
+     * @return
+     */
+    StorageAsset addAsset(String path, boolean container);
+
+    /**
+     * Removes the given asset from the storage.
+     *
+     * @param asset
+     * @throws IOException
+     */
+    void removeAsset(StorageAsset asset) throws IOException;
+
+    /**
+     * Moves the asset to the given location and returns the asset object for the destination.
+     *
+     * @param origin
+     * @param destination
+     * @return
+     */
+    StorageAsset moveAsset(StorageAsset origin, String destination) throws IOException;
+
+    /**
+     * Copies the given asset to the new destination.
+     *
+     * @param origin
+     * @param destination
+     * @return
+     * @throws IOException
+     */
+    StorageAsset copyAsset(StorageAsset origin, String destination) throws IOException;
+}