Hibernate example source code file (BytecodeProviderImpl.java)

This example Hibernate source code file (BytecodeProviderImpl.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Hibernate tags/keywords

class, class, classtransformer, coremessagelogger, fastclass, object, proxyfactoryfactoryimpl, proxyfactoryfactoryimpl, reflection, reflection, reflectionoptimizerimpl, string, string, throwable

The Hibernate BytecodeProviderImpl.java source code

/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2008-2011, Red Hat Inc. or third-party contributors as
 * indicated by the @author tags or express copyright attribution
 * statements applied by the authors.  All third-party contributions are
 * distributed under license by Red Hat Inc.
 *
 * 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, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY 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
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301  USA
 */
package org.hibernate.bytecode.internal.javassist;

import java.lang.reflect.Modifier;

import org.jboss.logging.Logger;

import org.hibernate.internal.CoreMessageLogger;
import org.hibernate.bytecode.buildtime.spi.ClassFilter;
import org.hibernate.bytecode.buildtime.spi.FieldFilter;
import org.hibernate.bytecode.spi.BytecodeProvider;
import org.hibernate.bytecode.spi.ClassTransformer;
import org.hibernate.bytecode.spi.ProxyFactoryFactory;
import org.hibernate.bytecode.spi.ReflectionOptimizer;
import org.hibernate.internal.util.StringHelper;

/**
 * Bytecode provider implementation for Javassist.
 *
 * @author Steve Ebersole
 */
public class BytecodeProviderImpl implements BytecodeProvider {

    private static final CoreMessageLogger LOG = Logger.getMessageLogger(CoreMessageLogger.class, BytecodeProviderImpl.class.getName());

	public ProxyFactoryFactory getProxyFactoryFactory() {
		return new ProxyFactoryFactoryImpl();
	}

	public ReflectionOptimizer getReflectionOptimizer(
			Class clazz,
	        String[] getterNames,
	        String[] setterNames,
	        Class[] types) {
		FastClass fastClass;
		BulkAccessor bulkAccessor;
		try {
			fastClass = FastClass.create( clazz );
			bulkAccessor = BulkAccessor.create( clazz, getterNames, setterNames, types );
			if ( !clazz.isInterface() && !Modifier.isAbstract( clazz.getModifiers() ) ) {
				if ( fastClass == null ) {
					bulkAccessor = null;
				}
				else {
					//test out the optimizer:
					Object instance = fastClass.newInstance();
					bulkAccessor.setPropertyValues( instance, bulkAccessor.getPropertyValues( instance ) );
				}
			}
		}
		catch ( Throwable t ) {
			fastClass = null;
			bulkAccessor = null;
            if (LOG.isDebugEnabled()) {
                int index = 0;
                if (t instanceof BulkAccessorException) index = ((BulkAccessorException)t).getIndex();
                if (index >= 0) LOG.debugf("Reflection optimizer disabled for: %s [%s: %s (property %s)",
                                           clazz.getName(),
                                           StringHelper.unqualify(t.getClass().getName()),
                                           t.getMessage(),
                                           setterNames[index]);
                else LOG.debugf("Reflection optimizer disabled for: %s [%s: %s",
                                clazz.getName(),
                                StringHelper.unqualify(t.getClass().getName()),
                                t.getMessage());
            }
		}

		if ( fastClass != null && bulkAccessor != null ) {
			return new ReflectionOptimizerImpl(
					new InstantiationOptimizerAdapter( fastClass ),
			        new AccessOptimizerAdapter( bulkAccessor, clazz )
			);
		}
        return null;
	}

	public ClassTransformer getTransformer(ClassFilter classFilter, FieldFilter fieldFilter) {
		return new JavassistClassTransformer( classFilter, fieldFilter );
	}
}