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package com.mario6.common.db.datasource;

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

/**
 * 抽象的数据源头
 * 复制来自spring-jdbc
 */
public abstract class AbstractDataSource implements DataSource {


    /**
     * Returns 0, indicating the default system timeout is to be used.
     */
    @Override
    public int getLoginTimeout() throws SQLException {
        return 0;
    }

    /**
     * Setting a login timeout is not supported.
     */
    @Override
    public void setLoginTimeout(int timeout) throws SQLException {
        throw new UnsupportedOperationException("setLoginTimeout");
    }

    /**
     * LogWriter methods are not supported.
     */
    @Override
    public PrintWriter getLogWriter() {
        throw new UnsupportedOperationException("getLogWriter");
    }

    /**
     * LogWriter methods are not supported.
     */
    @Override
    public void setLogWriter(PrintWriter pw) throws SQLException {
        throw new UnsupportedOperationException("setLogWriter");
    }


    //---------------------------------------------------------------------
    // Implementation of JDBC 4.0's Wrapper interface
    //---------------------------------------------------------------------

    @Override
    @SuppressWarnings("unchecked")
    public  T unwrap(Class iface) throws SQLException {
        if (iface.isInstance(this)) {
            return (T) this;
        }
        throw new SQLException("DataSource of type [" + getClass().getName() +
                "] cannot be unwrapped as [" + iface.getName() + "]");
    }

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

    @Override
    public Logger getParentLogger() throws SQLFeatureNotSupportedException {
        throw new UnsupportedOperationException("getParentLogger");
    }
}