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The core functionality of Hibernate
//$Id: ConnectionProviderFactory.java 7541 2005-07-18 22:37:31Z epbernard $
package org.hibernate.connection;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Properties;
import java.util.Set;
import java.util.Map;
import java.beans.Introspector;
import java.beans.BeanInfo;
import java.beans.IntrospectionException;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;
import java.lang.reflect.InvocationTargetException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.hibernate.HibernateException;
import org.hibernate.cfg.Environment;
import org.hibernate.util.ReflectHelper;
/**
* Instantiates a connection provider given either System properties or
* a java.util.Properties instance. The ConnectionProviderFactory
* first attempts to find a name of a ConnectionProvider subclass in the
* property hibernate.connection.provider_class. If missing, heuristics are used
* to choose either DriverManagerConnectionProvider,
* DatasourceConnectionProvider, C3P0ConnectionProvider or
* DBCPConnectionProvider.
* @see ConnectionProvider
* @author Gavin King
*/
public final class ConnectionProviderFactory {
private static final Logger log = LoggerFactory.getLogger(ConnectionProviderFactory.class);
/**
* Instantiate a ConnectionProvider using System properties.
* @return The created connection provider.
* @throws HibernateException
*/
public static ConnectionProvider newConnectionProvider() throws HibernateException {
return newConnectionProvider( Environment.getProperties() );
}
/**
* Instantiate a ConnectionProvider using given properties.
* Method newConnectionProvider.
* @param properties hibernate SessionFactory properties
* @return ConnectionProvider
* @throws HibernateException
*/
public static ConnectionProvider newConnectionProvider(Properties properties) throws HibernateException {
return newConnectionProvider( properties, null );
}
/**
* Create a connection provider based on the given information.
*
* @param properties Properties being used to build the {@link org.hibernate.SessionFactory}.
* @param connectionProviderInjectionData Soemthing to be injected in the conenction provided
* @return The created connection provider
* @throws HibernateException
*/
public static ConnectionProvider newConnectionProvider(Properties properties, Map connectionProviderInjectionData) throws HibernateException {
ConnectionProvider connections;
String providerClass = properties.getProperty(Environment.CONNECTION_PROVIDER);
if ( providerClass!=null ) {
try {
log.info("Initializing connection provider: " + providerClass);
connections = (ConnectionProvider) ReflectHelper.classForName(providerClass).newInstance();
}
catch ( Exception e ) {
log.error( "Could not instantiate connection provider", e );
throw new HibernateException("Could not instantiate connection provider: " + providerClass);
}
}
else if ( properties.getProperty(Environment.DATASOURCE)!=null ) {
connections = new DatasourceConnectionProvider();
}
else if ( properties.getProperty(Environment.URL)!=null ) {
connections = new DriverManagerConnectionProvider();
}
else {
connections = new UserSuppliedConnectionProvider();
}
if ( connectionProviderInjectionData != null && connectionProviderInjectionData.size() != 0 ) {
//inject the data
try {
BeanInfo info = Introspector.getBeanInfo( connections.getClass() );
PropertyDescriptor[] descritors = info.getPropertyDescriptors();
int size = descritors.length;
for (int index = 0 ; index < size ; index++) {
String propertyName = descritors[index].getName();
if ( connectionProviderInjectionData.containsKey( propertyName ) ) {
Method method = descritors[index].getWriteMethod();
method.invoke( connections, new Object[] { connectionProviderInjectionData.get( propertyName ) } );
}
}
}
catch (IntrospectionException e) {
throw new HibernateException("Unable to inject objects into the conenction provider", e);
}
catch (IllegalAccessException e) {
throw new HibernateException("Unable to inject objects into the conenction provider", e);
}
catch (InvocationTargetException e) {
throw new HibernateException("Unable to inject objects into the conenction provider", e);
}
}
connections.configure(properties);
return connections;
}
// cannot be instantiated
private ConnectionProviderFactory() { throw new UnsupportedOperationException(); }
/**
* Transform JDBC connection properties.
*
* Passed in the form hibernate.connection.* to the
* format accepted by DriverManager by triming the leading "hibernate.connection".
*/
public static Properties getConnectionProperties(Properties properties) {
Iterator iter = properties.keySet().iterator();
Properties result = new Properties();
while ( iter.hasNext() ) {
String prop = (String) iter.next();
if ( prop.indexOf(Environment.CONNECTION_PREFIX) > -1 && !SPECIAL_PROPERTIES.contains(prop) ) {
result.setProperty(
prop.substring( Environment.CONNECTION_PREFIX.length()+1 ),
properties.getProperty(prop)
);
}
}
String userName = properties.getProperty(Environment.USER);
if (userName!=null) result.setProperty( "user", userName );
return result;
}
private static final Set SPECIAL_PROPERTIES;
static {
SPECIAL_PROPERTIES = new HashSet();
SPECIAL_PROPERTIES.add(Environment.DATASOURCE);
SPECIAL_PROPERTIES.add(Environment.URL);
SPECIAL_PROPERTIES.add(Environment.CONNECTION_PROVIDER);
SPECIAL_PROPERTIES.add(Environment.POOL_SIZE);
SPECIAL_PROPERTIES.add(Environment.ISOLATION);
SPECIAL_PROPERTIES.add(Environment.DRIVER);
SPECIAL_PROPERTIES.add(Environment.USER);
}
}