feature #3782: Initial class for Snapshot list

include/Snapshot.h

@@ -0,0 +1,85 @@
+/* -------------------------------------------------------------------------- */
+/* Copyright 2002-2015, OpenNebula Project (OpenNebula.org), C12G Labs        */
+/*                                                                            */
+/* 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.                                             */
+/* -------------------------------------------------------------------------- */
+
+#ifndef SNAPSHOT_POOL_H_
+#define SNAPSHOT_POOL_H_
+
+#include <iostream>
+#include <string>
+#include <map>
+
+#include <libxml/parser.h>
+
+#include "Template.h"
+
+using namespace std;
+
+class VectorAttribute;
+
+/**
+ *  This class represents the List of Snapshots associated to an image or Virtual
+ *  Machine Disk
+ */
+class Snapshots
+{
+public:
+    Snapshots(int _disk_id);
+
+    virtual ~Snapshots();
+
+    // *************************************************************************
+    // Inititalization functions
+    // *************************************************************************
+
+    /**
+     *  Builds the snapshot list from its XML representation. This function
+     *  is used when importing it from the DB.
+     *    @param node xmlNode for the template
+     *    @return 0 on success
+     */
+    int from_xml_node(const xmlNodePtr node);
+
+    int create_snapshot(unsigned int p_id, const string& tag, string& error);
+
+    int delete_snapshot(unsigned int id);
+
+    /**
+     *  Set the given snapshot as active. Updates the values of the current
+     *  snapshot
+     */
+    int active_snapshot(unsigned int id);
+
+private:
+
+    /**
+     *  Get a snapshot from the pool
+     *  @param id of the snapshot
+     *  @return pointer to the snapshot (VectorAttribute) or null
+     */
+    VectorAttribute * get_snapshot(unsigned int id);
+
+    Template snapshot_template;
+
+    unsigned int next_snapshot;
+
+    unsigned int disk_id;
+
+    map<unsigned int, VectorAttribute *> snapshot_pool;
+
+    unsigned int active;
+};
+
+#endif /*SNAPSHOT_H_*/