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/*-
* ============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);
}
}
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