/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2015, 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.clustering.controller.transform;

import org.jboss.as.controller.PathAddress;
import org.jboss.as.controller.transform.TransformationContext;
import org.jboss.as.controller.transform.description.DiscardPolicy;
import org.jboss.as.controller.transform.description.DynamicDiscardPolicy;
import org.jboss.dmr.ModelNode;
import org.jboss.dmr.Property;

/**
 * Implementation of a generic {@link DynamicDiscardPolicy} that discards children resources which have all their
 * attributes undefined; rejects otherwise. It is to be used for all implicitly added resources in
 * {@link org.jboss.staxmapper.XMLElementReader} implementations.
 *
 * @author Radoslav Husar
 * @version Sep 2015
 */
public class ImplicitlyAddedResourceDynamicDiscardPolicy implements DynamicDiscardPolicy {

    /**
     * @return {@link DiscardPolicy#REJECT_AND_WARN} if any of the attributes are defined; {@link DiscardPolicy#SILENT} otherwise
     */
    @Override
    public DiscardPolicy checkResource(TransformationContext context, PathAddress address) {
        ModelNode model = context.readResource(PathAddress.EMPTY_ADDRESS).getModel();

        if (model.isDefined()) {
            for (Property entry : model.asPropertyList()) {
                if (entry.getValue().isDefined()) {
                    return DiscardPolicy.REJECT_AND_WARN;
                }
            }
        }

        return DiscardPolicy.SILENT;
    }

}
