1 files changed, 98 insertions, 0 deletions
diff --git a/src/main/java/org/openecomp/dmaapbc/database/DBSingleton.java b/src/main/java/org/openecomp/dmaapbc/database/DBSingleton.java
new file mode 100644
index 0000000..25ed793
--- /dev/null
+++ b/src/main/java/org/openecomp/dmaapbc/database/DBSingleton.java
@@ -0,0 +1,98 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * OpenECOMP - org.openecomp.dmaapbc
+ * ================================================================================
+ * Copyright (C) 2017 AT&T Intellectual Property. 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.openecomp.dmaapbc.database;
+
+import java.sql.*;
+import java.util.*;
+
+import org.openecomp.dmaapbc.util.Singleton;
+
+public class DBSingleton<C> extends TableHandler<C> implements Singleton<C>	{
+	private C singleton;
+	public DBSingleton(Class<C> cls, String tabname) throws Exception {
+		this(ConnectionFactory.getDefaultInstance(), cls, tabname);
+	}
+	public DBSingleton(ConnectionFactory cf, Class<C> cls, String tabname) throws Exception {
+		super(cf, cls, tabname, null);
+		singleton = cls.newInstance();
+	}
+	public C get() throws DBException {
+		return((new ConnWrapper<C, Object>() {
+			protected C run(Object junk) throws Exception {
+				ps = c.prepareStatement(getstmt);
+				rs = ps.executeQuery();
+				if (!rs.next()) {
+					return(null);
+				}
+				for (DBFieldHandler f: fields) {
+					f.fromSQL(rs, singleton);
+				}
+				return(singleton);
+			}
+		}).protect(cf, null));
+	}
+	public void init(C val) throws DBException {
+		if (get() != null) {
+			return;
+		}
+		(new ConnWrapper<Void, C>() {
+			protected Void run(C val) throws Exception {
+				ps = c.prepareStatement(initstmt);
+				for (DBFieldHandler f: fields) {
+					f.toSQL(val, ps);
+				}
+				ps.executeUpdate();
+				if (val != singleton) {
+					for (DBFieldHandler f: fields) {
+						f.copy(val, singleton);
+					}
+				}
+				return(null);
+			}
+		}).protect(cf, val);
+	}
+	public void update(C val) throws DBException {
+		(new ConnWrapper<Void, C>() {
+			protected Void run(C val) throws Exception {
+				ps = c.prepareStatement(insorreplstmt);
+				for (DBFieldHandler f: fields) {
+					f.toSQL(val, ps);
+				}
+				ps.executeUpdate();
+				if (val != singleton) {
+					for (DBFieldHandler f: fields) {
+						f.copy(val, singleton);
+					}
+				}
+				return(null);
+			}
+		}).protect(cf, val);
+	}
+	public void remove() throws DBException {
+		(new ConnWrapper<Void, Object>() {
+			protected Void run(Object junk) throws Exception {
+				ps = c.prepareStatement(delstmt);
+				ps.executeUpdate();
+				return(null);
+			}
+		}).protect(cf, null);
+	}
+}