/*
* Copyright 2004-2005 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springmodules.orm.hibernate3.support;
import java.io.Serializable;
import java.util.Iterator;
import org.hibernate.CallbackException;
import org.hibernate.EntityMode;
import org.hibernate.Interceptor;
import org.hibernate.Transaction;
import org.hibernate.type.Type;
import org.springmodules.orm.support.validation.ValidatingSupport;
/**
* <p>Hibernate 3 interceptor that implements the persistent object life-cycle event validation (POLEV) pattern on three life-cyle events
* within the Hibernate session:
*
* <ul>
* <li>onFlushDirty - occurs before a domain object is flushed to the database. This should be considered as an update of an existing object.
* <li>onSave - occurs before a domain object is saved to the database. This should be considered as an insertion of a new object.
* <li>onDelete - occurs before a domain object is removed from the database.
* </ul>
*
* <p>Please note the onLoad life-cyle event is not supported since persistent objects are not yet initialized when this event occurs.
*
* <p>Making validation of domain classes configurable is the main motivation for this interceptor. Especially for the onFlushDirty event this pattern is
* the only way to validate domain objects before they are saved. In general this pattern shift domain object validation away from business components.
*
*
* @author Steven Devijver
* @since Jun 16, 2005
* @see org.springmodules.orm.support.validation.ValidatingSupport
*/
public class PolevValidatingInterceptor implements Interceptor {
private static final String ON_LOAD_EVENT = "onLoad";
private static final String ON_FLUSH_DIRTY_EVENT = "onFlushDirty";
private static final String ON_SAVE_EVENT = "onSave";
private static final String ON_DELETE_EVENT = "onDelete";
public PolevValidatingInterceptor() {
super();
}
public boolean onLoad(Object entity, Serializable id, Object[] state,
String[] propertyNames, Type[] types) throws CallbackException {
ValidatingSupport.validate(entity, ON_LOAD_EVENT);
return false;
}
public boolean onFlushDirty(Object entity, Serializable id, Object[] currentState,
Object[] previousState, String[] propertyNames, Type[] types) throws CallbackException {
ValidatingSupport.validate(entity, ON_FLUSH_DIRTY_EVENT);
return false;
}
public boolean onSave(Object entity, Serializable id, Object[] state,
String[] propertyNames, Type[] type) throws CallbackException {
ValidatingSupport.validate(entity, ON_SAVE_EVENT);
return false;
}
public void onDelete(Object entity, Serializable id, Object[] state,
String[] propertyNames, Type[] type) throws CallbackException {
ValidatingSupport.validate(entity, ON_DELETE_EVENT);
}
public void preFlush(Iterator arg0) throws CallbackException {
}
public void postFlush(Iterator arg0) throws CallbackException {
}
public Boolean isTransient(Object arg0) {
return null;
}
public int[] findDirty(Object arg0, Serializable arg1, Object[] arg2,
Object[] arg3, String[] arg4, Type[] arg5) {
return null;
}
public Object instantiate(String arg0, EntityMode arg1, Serializable arg2)
throws CallbackException {
return null;
}
public String getEntityName(Object arg0) throws CallbackException {
return null;
}
public Object getEntity(String arg0, Serializable arg1)
throws CallbackException {
return null;
}
public void afterTransactionBegin(Transaction arg0) {
}
public void beforeTransactionCompletion(Transaction arg0) {
}
public void afterTransactionCompletion(Transaction arg0) {
}
}