/*
 *
 *  JBoss, Home of Professional Open Source.
 *  Copyright 2014, 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.wildfly.extension.beanvalidation;

import static org.jboss.as.controller.PersistentResourceXMLDescription.builder;

import java.util.List;

import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamException;

import org.jboss.as.controller.PathAddress;
import org.jboss.as.controller.PersistentResourceXMLDescription;
import org.jboss.as.controller.persistence.SubsystemMarshallingContext;
import org.jboss.dmr.ModelNode;
import org.jboss.staxmapper.XMLElementReader;
import org.jboss.staxmapper.XMLElementWriter;
import org.jboss.staxmapper.XMLExtendedStreamReader;
import org.jboss.staxmapper.XMLExtendedStreamWriter;

/**
 * This class implements a parser for the bean validation subsystem.
 *
 * @author Eduardo Martins
 */
class BeanValidationSubsystemParser implements XMLStreamConstants, XMLElementReader<List<ModelNode>>,
        XMLElementWriter<SubsystemMarshallingContext> {

    static final BeanValidationSubsystemParser INSTANCE = new BeanValidationSubsystemParser();

    private static final PersistentResourceXMLDescription XML_DESCRIPTION;

    static {
        XML_DESCRIPTION = builder(BeanValidationRootDefinition.INSTANCE)
                .build();
    }


    /**
     * Private constructor to enforce usage of the static singleton instance.
     */
    private BeanValidationSubsystemParser() {
    }

    @Override
    public void readElement(final XMLExtendedStreamReader reader, final List<ModelNode> modelNodes) throws XMLStreamException {
        XML_DESCRIPTION.parse(reader, PathAddress.EMPTY_ADDRESS, modelNodes);
    }

    @Override
    public void writeContent(final XMLExtendedStreamWriter writer, final SubsystemMarshallingContext context) throws XMLStreamException {
        ModelNode model = new ModelNode();
        model.get(BeanValidationRootDefinition.INSTANCE.getPathElement().getKeyValuePair()).set(context.getModelNode());
        XML_DESCRIPTION.persist(writer, model, Namespace.CURRENT.getUriString());
    }
}