/*
* JBoss, Home of Professional Open Source.
* Copyright 2011, Red Hat, Inc., and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software 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 software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.as.ejb3.component.entity.interceptors;
import org.jboss.as.ee.component.ComponentView;
import org.jboss.as.ejb3.component.entity.EntityBeanComponent;
import org.jboss.invocation.Interceptor;
import org.jboss.invocation.InterceptorContext;
import org.jboss.invocation.InterceptorFactory;
import org.jboss.invocation.InterceptorFactoryContext;
/**
* Interceptor for equals / hashCode for Entity beans.
*
* @author Stuart Douglas
* @author John Bailey
*/
public class EntityBeanIdentityInterceptorFactory implements InterceptorFactory {
public static final EntityBeanIdentityInterceptorFactory INSTANCE = new EntityBeanIdentityInterceptorFactory();
public Interceptor create(final InterceptorFactoryContext context) {
final ComponentView componentView = (ComponentView) context.getContextData().get(ComponentView.class);
return new EntityIdentityInterceptor(componentView);
}
private class EntityIdentityInterceptor implements Interceptor {
private final ComponentView componentView;
public EntityIdentityInterceptor(final ComponentView componentView) {
this.componentView = componentView;
}
public Object processInvocation(final InterceptorContext context) throws Exception {
final Object primaryKey = context.getPrivateData(EntityBeanComponent.PRIMARY_KEY_CONTEXT_KEY);
if (context.getMethod().getName().equals("equals") && context.getParameters().length == 1 && context.getMethod().getParameterTypes()[0] == Object.class) {
final Object other = context.getParameters()[0];
final Class<?> proxyType = componentView.getProxyClass();
if( proxyType.isAssignableFrom(other.getClass())) {
//now we know that this is an ejb for the correct component view
//as digging out the session id from the proxy object is not really
//a viable option, we invoke equals() for the other instance with a
//PrimaryKeyHolder as the other side
return other.equals(new PrimaryKeyHolder(primaryKey));
} else if(other instanceof PrimaryKeyHolder) {
return primaryKey.equals(((PrimaryKeyHolder) other).primaryKey);
} else {
return false;
}
} else if (context.getMethod().getName().equals("hashCode")) {
//use the identity of the component view as a hash code
return primaryKey.hashCode();
} else {
return context.proceed();
}
}
}
private static class PrimaryKeyHolder {
private final Object primaryKey;
public PrimaryKeyHolder(final Object primaryKey) {
this.primaryKey = primaryKey;
}
}
}