1 files changed, 66 insertions, 0 deletions
diff --git a/model/basic-model/src/main/java/org/onap/apex/model/basicmodel/dao/ApexDaoFactory.java b/model/basic-model/src/main/java/org/onap/apex/model/basicmodel/dao/ApexDaoFactory.java
new file mode 100644
index 000000000..ecb8a4658
--- /dev/null
+++ b/model/basic-model/src/main/java/org/onap/apex/model/basicmodel/dao/ApexDaoFactory.java
@@ -0,0 +1,66 @@
+/*
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
+ * ================================================================================
+ * 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.
+ * 
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.apex.model.basicmodel.dao;
+
+import org.onap.apex.model.basicmodel.concepts.ApexException;
+import org.onap.policy.apex.model.utilities.Assertions;
+import org.slf4j.ext.XLogger;
+import org.slf4j.ext.XLoggerFactory;
+
+/**
+ * This factory class returns an Apex DAO for the configured persistence mechanism. The factory uses the plugin class specified in {@link DAOParameters} to
+ * instantiate a DAO instance.
+ *
+ * @author Liam Fallon (liam.fallon@ericsson.com)
+ */
+public class ApexDaoFactory {
+    // Get a reference to the logger
+    private static final XLogger LOGGER = XLoggerFactory.getXLogger(ApexDaoFactory.class);
+
+    /**
+     * Return an Apex DAO for the required APEX DAO plugin class.
+     *
+     * @param daoParameters parameters to use to read the database configuration information
+     * @return the Apex DAO
+     * @throws ApexException on invalid JPA plugins
+     */
+    public ApexDao createApexDao(final DAOParameters daoParameters) throws ApexException {
+        Assertions.argumentNotNull(daoParameters, ApexException.class, "Parameter \"daoParameters\" may not be null");
+
+        // Get the class for the DAO using reflection
+        Object apexDaoObject = null;
+        try {
+            apexDaoObject = Class.forName(daoParameters.getPluginClass()).newInstance();
+        }
+        catch (InstantiationException | IllegalAccessException | ClassNotFoundException e) {
+            LOGGER.error("Apex DAO class not found for DAO plugin \"" + daoParameters.getPluginClass() + "\"", e);
+            throw new ApexException("Apex DAO class not found for DAO plugin \"" + daoParameters.getPluginClass() + "\"", e);
+        }
+
+        // Check the class is an Apex DAO
+        if (!(apexDaoObject instanceof ApexDao)) {
+            LOGGER.error("Specified Apex DAO plugin class \"" + daoParameters.getPluginClass() + "\" does not implement the ApexDao interface");
+            throw new ApexException("Specified Apex DAO plugin class \"" + daoParameters.getPluginClass() + "\" does not implement the ApexDao interface");
+        }
+
+        return (ApexDao) apexDaoObject;
+    }
+}