/*
* 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.instrumentation.internal;
import java.util.HashSet;
import java.util.Set;
import org.hibernate.bytecode.instrumentation.internal.javassist.JavassistHelper;
import org.hibernate.bytecode.instrumentation.spi.FieldInterceptor;
import org.hibernate.engine.spi.SessionImplementor;
/**
* Helper class for dealing with enhanced entity classes.
*
* These operations are expensive. When under a SessionFactory, try and use (or guard with)
* {@link org.hibernate.service.instrumentation.spi.InstrumentationService#isInstrumented}
*
* @author Steve Ebersole
*/
public class FieldInterceptionHelper {
private static final Set<Delegate> INSTRUMENTATION_DELEGATES = buildInstrumentationDelegates();
private static Set<Delegate> buildInstrumentationDelegates() {
HashSet<Delegate> delegates = new HashSet<Delegate>();
delegates.add( JavassistDelegate.INSTANCE );
return delegates;
}
private FieldInterceptionHelper() {
}
public static boolean isInstrumented(Class entityClass) {
for ( Delegate delegate : INSTRUMENTATION_DELEGATES ) {
if ( delegate.isInstrumented( entityClass ) ) {
return true;
}
}
return false;
}
public static boolean isInstrumented(Object entity) {
return entity != null && isInstrumented( entity.getClass() );
}
public static FieldInterceptor extractFieldInterceptor(Object entity) {
if ( entity == null ) {
return null;
}
FieldInterceptor interceptor = null;
for ( Delegate delegate : INSTRUMENTATION_DELEGATES ) {
interceptor = delegate.extractInterceptor( entity );
if ( interceptor != null ) {
break;
}
}
return interceptor;
}
public static FieldInterceptor injectFieldInterceptor(
Object entity,
String entityName,
Set uninitializedFieldNames,
SessionImplementor session) {
if ( entity == null ) {
return null;
}
FieldInterceptor interceptor = null;
for ( Delegate delegate : INSTRUMENTATION_DELEGATES ) {
interceptor = delegate.injectInterceptor( entity, entityName, uninitializedFieldNames, session );
if ( interceptor != null ) {
break;
}
}
return interceptor;
}
public static void clearDirty(Object entity) {
FieldInterceptor interceptor = extractFieldInterceptor( entity );
if ( interceptor != null ) {
interceptor.clearDirty();
}
}
public static void markDirty(Object entity) {
FieldInterceptor interceptor = extractFieldInterceptor( entity );
if ( interceptor != null ) {
interceptor.dirty();
}
}
private static interface Delegate {
public boolean isInstrumented(Class classToCheck);
public FieldInterceptor extractInterceptor(Object entity);
public FieldInterceptor injectInterceptor(Object entity, String entityName, Set uninitializedFieldNames, SessionImplementor session);
}
private static class JavassistDelegate implements Delegate {
public static final JavassistDelegate INSTANCE = new JavassistDelegate();
public static final String MARKER = "org.hibernate.bytecode.internal.javassist.FieldHandled";
@Override
public boolean isInstrumented(Class classToCheck) {
for ( Class definedInterface : classToCheck.getInterfaces() ) {
if ( MARKER.equals( definedInterface.getName() ) ) {
return true;
}
}
return false;
}
@Override
public FieldInterceptor extractInterceptor(Object entity) {
for ( Class definedInterface : entity.getClass().getInterfaces() ) {
if ( MARKER.equals( definedInterface.getName() ) ) {
return JavassistHelper.extractFieldInterceptor( entity );
}
}
return null;
}
@Override
public FieldInterceptor injectInterceptor(
Object entity,
String entityName,
Set uninitializedFieldNames,
SessionImplementor session) {
for ( Class definedInterface : entity.getClass().getInterfaces() ) {
if ( MARKER.equals( definedInterface.getName() ) ) {
return JavassistHelper.injectFieldInterceptor( entity, entityName, uninitializedFieldNames, session );
}
}
return null;
}
}
}