org.hibernate.engine.jdbc.dialect.internal.DialectFactoryImpl Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of hibernate-core Show documentation
Show all versions of hibernate-core Show documentation
Hibernate's core ORM functionality
/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later.
* See the lgpl.txt file in the root directory or .
*/
package org.hibernate.engine.jdbc.dialect.internal;
import java.util.Map;
import org.hibernate.HibernateException;
import org.hibernate.annotations.common.util.StringHelper;
import org.hibernate.boot.registry.selector.spi.StrategySelector;
import org.hibernate.cfg.AvailableSettings;
import org.hibernate.dialect.Dialect;
import org.hibernate.engine.jdbc.dialect.spi.DialectFactory;
import org.hibernate.engine.jdbc.dialect.spi.DialectResolutionInfo;
import org.hibernate.engine.jdbc.dialect.spi.DialectResolutionInfoSource;
import org.hibernate.engine.jdbc.dialect.spi.DialectResolver;
import org.hibernate.service.spi.ServiceRegistryAwareService;
import org.hibernate.service.spi.ServiceRegistryImplementor;
/**
* Standard implementation of the {@link DialectFactory} service.
*
* @author Steve Ebersole
*/
public class DialectFactoryImpl implements DialectFactory, ServiceRegistryAwareService {
private StrategySelector strategySelector;
private DialectResolver dialectResolver;
@Override
public void injectServices(ServiceRegistryImplementor serviceRegistry) {
this.strategySelector = serviceRegistry.getService( StrategySelector.class );
this.dialectResolver = serviceRegistry.getService( DialectResolver.class );
}
/**
* Intended only for use from testing.
*
* @param dialectResolver The DialectResolver to use
*/
public void setDialectResolver(DialectResolver dialectResolver) {
this.dialectResolver = dialectResolver;
}
@Override
public Dialect buildDialect(Map configValues, DialectResolutionInfoSource resolutionInfoSource) throws HibernateException {
final Object dialectReference = configValues.get( AvailableSettings.DIALECT );
if ( !isEmpty( dialectReference ) ) {
return constructDialect( dialectReference );
}
else {
return determineDialect( resolutionInfoSource );
}
}
@SuppressWarnings("SimplifiableIfStatement")
private boolean isEmpty(Object dialectReference) {
if ( dialectReference != null ) {
// the referenced value is not null
if ( dialectReference instanceof String ) {
// if it is a String, it might still be empty though...
return StringHelper.isEmpty( (String) dialectReference );
}
return false;
}
return true;
}
private Dialect constructDialect(Object dialectReference) {
final Dialect dialect;
try {
dialect = strategySelector.resolveStrategy( Dialect.class, dialectReference );
if ( dialect == null ) {
throw new HibernateException( "Unable to construct requested dialect [" + dialectReference + "]" );
}
return dialect;
}
catch (HibernateException e) {
throw e;
}
catch (Exception e) {
throw new HibernateException( "Unable to construct requested dialect [" + dialectReference + "]", e );
}
}
/**
* Determine the appropriate Dialect to use given the connection.
*
* @param resolutionInfoSource Access to DialectResolutionInfo used to resolve the Dialect.
*
* @return The appropriate dialect instance.
*
* @throws HibernateException No connection given or no resolver could make
* the determination from the given connection.
*/
private Dialect determineDialect(DialectResolutionInfoSource resolutionInfoSource) {
if ( resolutionInfoSource == null ) {
throw new HibernateException( "Access to DialectResolutionInfo cannot be null when 'hibernate.dialect' not set" );
}
final DialectResolutionInfo info = resolutionInfoSource.getDialectResolutionInfo();
final Dialect dialect = dialectResolver.resolveDialect( info );
if ( dialect == null ) {
throw new HibernateException(
"Unable to determine Dialect to use [name=" + info.getDatabaseName() +
", majorVersion=" + info.getDatabaseMajorVersion() +
"]; user must register resolver or explicitly set 'hibernate.dialect'"
);
}
return dialect;
}
}