Refactor code to support no AAF requests

[dmaap/dbcapi.git] / src / main / java / org / onap / dmaap / dbcapi / database / DBSingleton.java

diff --git a/src/main/java/org/onap/dmaap/dbcapi/database/DBSingleton.java b/src/main/java/org/onap/dmaap/dbcapi/database/DBSingleton.java
new file mode 100644 (file)
index 0000000..9a34f58
--- /dev/null
+++ b/src/main/java/org/onap/dmaap/dbcapi/database/DBSingleton.java
@@ -0,0 +1,98 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * org.onap.dmaap
+ * ================================================================================
+ * 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.onap.dmaap.dbcapi.database;
+
+import java.sql.*;
+import java.util.*;
+
+import org.onap.dmaap.dbcapi.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);
+       }
+}