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/*
* 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. They are only meant to be used when code does not have access to a
* SessionFactory (namely from the instrumentation tasks). When code has access to a SessionFactory,
* {@link org.hibernate.bytecode.spi.EntityInstrumentationMetadata} should be used instead to query the
* instrumentation state. EntityInstrumentationMetadata is accessed from the
* {@link org.hibernate.persister.entity.EntityPersister} via the
* {@link org.hibernate.persister.entity.EntityPersister#getInstrumentationMetadata()} method.
*
* @author Steve Ebersole
*/
public class FieldInterceptionHelper {
private static final Set INSTRUMENTATION_DELEGATES = buildInstrumentationDelegates();
private static Set buildInstrumentationDelegates() {
final HashSet delegates = new HashSet();
delegates.add( JavassistDelegate.INSTANCE );
return delegates;
}
/**
* Utility to check to see if a given entity class is instrumented.
*
* @param entityClass The entity class to check
*
* @return {@code true} if it has been instrumented; {@code false} otherwise
*/
public static boolean isInstrumented(Class entityClass) {
for ( Delegate delegate : INSTRUMENTATION_DELEGATES ) {
if ( delegate.isInstrumented( entityClass ) ) {
return true;
}
}
return false;
}
/**
* Utility to check to see if a given object is an instance of an instrumented class. If the instance
* is {@code null}, the check returns {@code false}
*
* @param object The object to check
*
* @return {@code true} if it has been instrumented; {@code false} otherwise
*/
public static boolean isInstrumented(Object object) {
return object != null && isInstrumented( object.getClass() );
}
/**
* Assuming the given object is an enhanced entity, extract and return its interceptor. Will
* return {@code null} if object is {@code null}, or if the object was deemed to not be
* instrumented
*
* @param object The object from which to extract the interceptor
*
* @return The extracted interceptor, or {@code null}
*/
public static FieldInterceptor extractFieldInterceptor(Object object) {
if ( object == null ) {
return null;
}
FieldInterceptor interceptor = null;
for ( Delegate delegate : INSTRUMENTATION_DELEGATES ) {
interceptor = delegate.extractInterceptor( object );
if ( interceptor != null ) {
break;
}
}
return interceptor;
}
/**
* Assuming the given object is an enhanced entity, inject a field interceptor.
*
* @param entity The entity instance
* @param entityName The entity name
* @param uninitializedFieldNames The names of any uninitialized fields
* @param session The session
*
* @return The injected 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;
}
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;
}
}
private FieldInterceptionHelper() {
}
}
