org.hibernate.bytecode.instrumentation.spi.AbstractFieldInterceptor Maven / Gradle / Ivy
/*
* 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.bytecode.instrumentation.spi;
import java.io.Serializable;
import java.util.Set;
import org.hibernate.LazyInitializationException;
import org.hibernate.engine.spi.SessionImplementor;
/**
* Base support for FieldInterceptor implementations.
*
* @author Steve Ebersole
*/
public abstract class AbstractFieldInterceptor implements FieldInterceptor, Serializable {
private transient SessionImplementor session;
private Set uninitializedFields;
private final String entityName;
private transient boolean initializing;
private boolean dirty;
protected AbstractFieldInterceptor(SessionImplementor session, Set uninitializedFields, String entityName) {
this.session = session;
this.uninitializedFields = uninitializedFields;
this.entityName = entityName;
}
// FieldInterceptor impl ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@Override
public final void setSession(SessionImplementor session) {
this.session = session;
}
@Override
public final boolean isInitialized() {
return uninitializedFields == null || uninitializedFields.size() == 0;
}
@Override
public final boolean isInitialized(String field) {
return uninitializedFields == null || !uninitializedFields.contains( field );
}
@Override
public final void dirty() {
dirty = true;
}
@Override
public final boolean isDirty() {
return dirty;
}
@Override
public final void clearDirty() {
dirty = false;
}
// subclass accesses ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/**
* Interception of access to the named field
*
* @param target The call target
* @param fieldName The name of the field.
* @param value The value.
*
* @return ?
*/
protected final Object intercept(Object target, String fieldName, Object value) {
if ( initializing ) {
return value;
}
if ( uninitializedFields != null && uninitializedFields.contains( fieldName ) ) {
if ( session == null ) {
throw new LazyInitializationException( "entity with lazy properties is not associated with a session" );
}
else if ( !session.isOpen() || !session.isConnected() ) {
throw new LazyInitializationException( "session is not connected" );
}
final Object result;
initializing = true;
try {
result = ( (LazyPropertyInitializer) session.getFactory().getEntityPersister( entityName ) )
.initializeLazyProperty( fieldName, target, session );
}
finally {
initializing = false;
}
// let's assume that there is only one lazy fetch group, for now!
uninitializedFields = null;
return result;
}
else {
return value;
}
}
/**
* Access to the session
*
* @return The associated session
*/
public final SessionImplementor getSession() {
return session;
}
/**
* Access to all currently uninitialized fields
*
* @return The name of all currently uninitialized fields
*/
public final Set getUninitializedFields() {
return uninitializedFields;
}
/**
* Access to the intercepted entity name
*
* @return The entity name
*/
public final String getEntityName() {
return entityName;
}
/**
* Is the instance currently initializing?
*
* @return true/false.
*/
public final boolean isInitializing() {
return initializing;
}
}