/*
 * JBoss, Home of Professional Open Source
 * Copyright 2010, Red Hat Inc., and individual contributors as indicated
 * by the @authors tag. See the copyright.txt 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.appclient.subsystem;

import static org.jboss.as.controller.descriptions.ModelDescriptionConstants.SUBSYSTEM;

import java.util.List;

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

import org.jboss.as.controller.Extension;
import org.jboss.as.controller.ExtensionContext;
import org.jboss.as.controller.ModelVersion;
import org.jboss.as.controller.PathAddress;
import org.jboss.as.controller.PathElement;
import org.jboss.as.controller.SubsystemRegistration;
import org.jboss.as.controller.descriptions.ResourceDescriptionResolver;
import org.jboss.as.controller.descriptions.StandardResourceDescriptionResolver;
import org.jboss.as.controller.operations.common.Util;
import org.jboss.as.controller.parsing.ExtensionParsingContext;
import org.jboss.as.controller.parsing.ParseUtils;
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;

/**
 * Extension that hooks the application client work into the deployment
 *
 * @author Stuart Douglas
 */
public class AppClientExtension implements Extension {

    public static final String NAMESPACE_1_0 = "urn:jboss:domain:appclient:1.0";
    public static final String SUBSYSTEM_NAME = "appclient";
    static final PathElement SUBSYSTEM_PATH = PathElement.pathElement(SUBSYSTEM, SUBSYSTEM_NAME);

    private static final ModelVersion CURRENT_MODEL_VERSION = ModelVersion.create(1, 1, 0);

    private static final ApplicationClientSubsystemParser parser = new ApplicationClientSubsystemParser();


    private static final String RESOURCE_NAME = AppClientExtension.class.getPackage().getName() + ".LocalDescriptions";

    @Override
    public void initialize(final ExtensionContext context) {
        final SubsystemRegistration subsystem = context.registerSubsystem(Constants.SUBSYSTEM_NAME, CURRENT_MODEL_VERSION);
        subsystem.registerSubsystemModel(AppClientSubsystemResourceDefinition.INSTANCE);
        subsystem.registerXMLElementWriter(parser);
    }

    @Override
    public void initializeParsers(final ExtensionParsingContext context) {
        context.setSubsystemXmlMapping(Constants.SUBSYSTEM_NAME, AppClientExtension.NAMESPACE_1_0, parser);
    }


    static class ApplicationClientSubsystemParser implements XMLStreamConstants, XMLElementReader<List<ModelNode>>, XMLElementWriter<SubsystemMarshallingContext> {

        /**
         * {@inheritDoc}
         */
        @Override
        public void writeContent(XMLExtendedStreamWriter writer, SubsystemMarshallingContext context) throws XMLStreamException {
            context.startSubsystemElement(AppClientExtension.NAMESPACE_1_0, false);
            writer.writeEndElement();
        }

        /**
         * {@inheritDoc}
         */
        @Override
        public void readElement(XMLExtendedStreamReader reader, List<ModelNode> list) throws XMLStreamException {
            ParseUtils.requireNoAttributes(reader);
            ParseUtils.requireNoContent(reader);
            list.add(Util.createAddOperation(PathAddress.pathAddress(SUBSYSTEM_PATH)));
        }
    }

    public static ResourceDescriptionResolver getResourceDescriptionResolver(final String keyPrefix) {
        return new StandardResourceDescriptionResolver(keyPrefix, RESOURCE_NAME, AppClientExtension.class.getClassLoader(), true, true);
    }

}
