org.apache.jackrabbit.core.util.db.ResultSetWrapper Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
package org.apache.jackrabbit.core.util.db;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
/**
* This is a dynamic proxy in order to support both Java 5 and 6.
*/
public final class ResultSetWrapper implements InvocationHandler {
private final Connection connection;
private final Statement statement;
private final ResultSet resultSet;
/**
* Creates a new {@code ResultSet} proxy which closes the given {@code Connection} and
* {@code Statement} if it is closed.
*
* @param con the associated {@code Connection}
* @param stmt the associated {@code Statement}
* @param rs the {@code ResultSet} which backs the proxy
* @return a {@code ResultSet} proxy
*/
public static final ResultSet newInstance(Connection con, Statement stmt, ResultSet rs) {
ResultSetWrapper proxy = new ResultSetWrapper(con, stmt, rs);
return (ResultSet) Proxy.newProxyInstance(rs.getClass().getClassLoader(),
new Class[]{ResultSet.class}, proxy);
}
private ResultSetWrapper(Connection con, Statement stmt, ResultSet rs) {
connection = con;
statement = stmt;
resultSet = rs;
}
/**
* {@inheritDoc}
*/
public Object invoke(Object proxy, Method m, Object[] args) throws Throwable {
if ("close".equals(m.getName())) {
DbUtility.close(connection, statement, resultSet);
return null;
} else {
return m.invoke(resultSet, args);
}
}
}