AbstractSimplePropertyUpdateInterceptor.java

package fr.openwide.core.jpa.hibernate.interceptor;

import java.io.Serializable;

import org.hibernate.type.Type;

public abstract class AbstractSimplePropertyUpdateInterceptor<T> extends AbstractChainableInterceptor {

	@SuppressWarnings("unchecked")
	@Override
	public boolean onFlushDirty(Object entity, Serializable id, Object[] currentState, Object[] previousState,
			String[] propertyNames, Type[] types) {
		
		for (int i = 0; i < propertyNames.length; ++i) {
			if (propertyNames[i].equals(getObservedFieldName())) {
				
				boolean dirty = false;
				if (currentState[i] == null) {
					if (previousState[i] != null) {
						dirty = true;
					}
				} else if (!currentState[i].equals(previousState[i])) {
					dirty = true;
				}
				
				if (dirty) {
					return onChange((T) entity, currentState, previousState, propertyNames, types);
				}
				
				return false;
			}
		}
		
		return false;
	}
	
	@Override
	public boolean applyTo(Object entity) {
		return isOfClass(entity, getObservedClass());
	}
	
	protected abstract Class<T> getObservedClass();
	
	protected abstract String getObservedFieldName();
	
	protected abstract boolean onChange(T entity, Object[] currentState, Object[] previousState, String[] propertyNames, Type[] types);
	
}