/*
 * 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
 *
 *  https://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.
 *
 * Other licenses:
 * -----------------------------------------------------------------------------
 * Commercial licenses for this work are available. These replace the above
 * Apache-2.0 license and offer limited warranties, support, maintenance, and
 * commercial database integrations.
 *
 * For more information, please visit: https://www.jooq.org/legal/licensing
 *
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 */
package org.jooq.tools.jdbc;

import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.SQLException;
import java.sql.SQLFeatureNotSupportedException;
import java.util.logging.Logger;

import javax.sql.DataSource;

/**
 * A {@link DataSource} that wraps a single connection, preventing its closing
 * when it is obtained from this data source.
 *
 * @author Lukas Eder
 */
public class SingleConnectionDataSource implements DataSource {

    private final Connection delegate;

    public SingleConnectionDataSource(Connection delegate) {
        this.delegate = delegate;
    }

    @Override
    public Logger getParentLogger() throws SQLFeatureNotSupportedException {
        // Cannot use Logger.getGlobal() in JDK 6 yet
        return Logger.getAnonymousLogger().getParent();
    }

    @SuppressWarnings("unchecked")
    @Override
    public <T> T unwrap(Class<T> iface) throws SQLException {
        if (isWrapperFor(iface))
            return (T) this;
        else
            throw new SQLException("DataSource does not implement " + iface);
    }

    @Override
    public boolean isWrapperFor(Class<?> iface) throws SQLException {
        return iface.isInstance(this);
    }

    @Override
    public Connection getConnection() throws SQLException {
        return new DefaultConnection(delegate) {
            @Override
            public void close() throws SQLException {
                // Ignore close calls
            }
        };
    }

    @Override
    public Connection getConnection(String username, String password) throws SQLException {
        throw new SQLFeatureNotSupportedException("SingleConnectionDataSource cannot create new connections");
    }

    @Override
    public PrintWriter getLogWriter() throws SQLException {
        throw new SQLFeatureNotSupportedException("getLogWriter");
    }

    @Override
    public void setLogWriter(PrintWriter out) throws SQLException {
        throw new SQLFeatureNotSupportedException("setLogWriter");
    }

    @Override
    public void setLoginTimeout(int seconds) throws SQLException {
        throw new SQLFeatureNotSupportedException("setLoginTimeout");
    }

    @Override
    public int getLoginTimeout() throws SQLException {
        throw new SQLFeatureNotSupportedException("getLoginTimeout");
    }
}
