/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* JBoss, Home of Professional Open Source
* Copyright 2011 Red Hat Inc. and/or its affiliates and other contributors
* as indicated by the @authors tag. All rights reserved.
* See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU Lesser General Public License, v. 2.1.
* This program is distributed in the hope that it will be useful, but WITHOUT A
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
* PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public License,
* v.2.1 along with this distribution; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
package org.hibernate.ogm.dialect.impl;
import org.hibernate.ogm.datastore.spi.DatastoreProvider;
import org.hibernate.ogm.dialect.GridDialect;
import org.hibernate.ogm.dialect.GridDialectLogger;
import org.hibernate.ogm.util.impl.Log;
import org.hibernate.ogm.util.impl.LoggerFactory;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.service.classloading.spi.ClassLoaderService;
import java.lang.reflect.Constructor;
import java.util.Map;
/**
* @author Emmanuel Bernard <emmanuel@hibernate.org>
*/
public class GridDialectFactoryImpl implements GridDialectFactory {
private static final Log log = LoggerFactory.make();
private DatastoreProvider datastore;
public GridDialectFactoryImpl(DatastoreProvider datastore) {
this.datastore = datastore;
}
public GridDialect buildGridDialect(Map configurationValues, ServiceRegistry registry) {
Object value = configurationValues.get( GRID_DIALECT );
Class<? extends GridDialect> dialectClass = dialectClass( registry, value );
return buildDialect( registry, dialectClass );
}
private GridDialect buildDialect(ServiceRegistry registry, Class<? extends GridDialect> dialectClass) {
try {
// FIXME not sure I like this constructor business. Argue with Sanne
// to me that's blocking the doors for future enhancements (ie injecting more things)
// an alternative is to pass the ServiceRegistry verbatim but I'm not sure that's enough either
Constructor injector = null;
for ( Constructor constructor : dialectClass.getConstructors() ) {
Class[] parameterTypes = constructor.getParameterTypes();
if ( parameterTypes.length == 1 && DatastoreProvider.class.isAssignableFrom( parameterTypes[0] ) ) {
injector = constructor;
break;
}
}
if ( injector == null ) {
log.gridDialectHasNoProperConstrutor( dialectClass );
}
GridDialect gridDialect = (GridDialect) injector.newInstance( datastore );
log.useGridDialect( gridDialect.getClass().getName() );
if ( GridDialectLogger.activationNeeded() ) {
gridDialect = new GridDialectLogger( gridDialect );
log.info( "Grid dialect logs are active" );
}
else {
log.info( "Grid dialect logs are disabled" );
}
return gridDialect;
}
catch ( Exception e ) {
throw log.cannotInstantiateGridDialect( dialectClass, e );
}
}
private Class<? extends GridDialect> dialectClass(ServiceRegistry registry, Object value) {
if ( value == null ) {
return datastore.getDefaultDialect();
}
else if ( value instanceof String ) {
return findGridDialect( registry, value.toString() );
}
else {
throw log.gridDialectPropertyOfUnknownType( value.getClass() );
}
}
private Class<? extends GridDialect> findGridDialect(ServiceRegistry registry, String value) {
Class<?> maybeDialectClass = loadClass( registry, value );
if ( GridDialect.class.isAssignableFrom( maybeDialectClass ) ) {
return (Class<? extends GridDialect>) maybeDialectClass;
}
else {
throw log.doesNotImplementGridDialect( value.toString() );
}
}
private Class<? extends GridDialect> loadClass(ServiceRegistry registry, String value) {
try {
return registry.getService( ClassLoaderService.class ).classForName( value );
}
catch (RuntimeException e) {
throw log.dialectClassCannotBeFound( value.toString() );
}
}
}