import org.apache.openjpa.lib.log.Log; //导入依赖的package包/类
private void immediateDropDB(ConnectionProperties props) throws Exception {
	if (context != null) {
		destroyApplication();
		context = null;
	}
	JDBCConfigurationImpl conf = new JDBCConfigurationImpl();
	try {
		conf.setPropertiesFile(OmFileHelper.getPersistence());
		conf.setConnectionDriverName(props.getDriver());
		conf.setConnectionURL(props.getURL());
		conf.setConnectionUserName(props.getLogin());
		conf.setConnectionPassword(props.getPassword());
		//HACK to suppress all warnings
		getLogImpl(conf).setLevel(Log.INFO);
		runSchemaTool(conf, SchemaTool.ACTION_DROPDB);
		runSchemaTool(conf, SchemaTool.ACTION_CREATEDB);
	} finally {
		conf.close();
	}
}
 

import org.apache.openjpa.lib.log.Log; //导入依赖的package包/类
@Override
   public boolean beforeConfigurationLoad(final Configuration conf) {
if (conf instanceof JDBCConfigurationImpl) {
    final JDBCConfigurationImpl jdbcConfig = (JDBCConfigurationImpl) conf;

    final PluginValue dbdictionaryPlugin = jdbcConfig.dbdictionaryPlugin;

    final Log log = jdbcConfig.getLog(JDBCConfiguration.LOG_JDBC);

    if (classPresent("com.ibm.ws.persistence.jdbc.sql.DB2Dictionary")) {
	if (log.isInfoEnabled()) {
	    log.info(_loc.get("db2-ws-dictionary"));
	}
	dbdictionaryPlugin.setAlias("db2", RowNumberWSDB2Dictionary.class.getName());
	return true;
    }

    if (classPresent("org.apache.openjpa.jdbc.sql.DB2Dictionary")) {
	if (log.isInfoEnabled()) {
	    log.info(_loc.get("db2-openjpa-dictionary"));
	}
	dbdictionaryPlugin.setAlias("db2", RowNumberDB2Dictionary.class.getName());
	return true;
    }
}
return false;
   }
 

import org.apache.openjpa.lib.log.Log; //导入依赖的package包/类
protected Log newLogAdapter(String channel) {
    return new LogAdapter(LoggerFactory.getLogger(channel));
}
 

import org.apache.openjpa.lib.log.Log; //导入依赖的package包/类
@Override
public Log getLog(final String channel) {
    return new OpenJPALog(channel);
}
 

import org.apache.openjpa.lib.log.Log; //导入依赖的package包/类
@Override
protected Log newLogAdapter(final String channel) {
    return new JULOpenJPALog(new LoggerCreator(channel));
}
 

import org.apache.openjpa.lib.log.Log; //导入依赖的package包/类
@Override
public Log getLog(final String channel) {
    CHANNELS.add(channel);
    return new NoneLogFactory.NoneLog();
}