/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2020, 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 java.util.List;

import org.jboss.as.clustering.controller.Attribute;
import org.jboss.as.controller.AttributeDefinition;
import org.jboss.as.controller.PathAddress;
import org.jboss.as.controller.transform.TransformationContext;
import org.jboss.dmr.ModelNode;

/**
 * Converts a singleton list to a single value.
 * @author Paul Ferraro
 */
public class SingletonListAttributeConverter extends SimpleAttributeConverter {

    public SingletonListAttributeConverter(Attribute listAttribute) {
        this(listAttribute.getDefinition());
    }

    public SingletonListAttributeConverter(AttributeDefinition listAttribute) {
        super(new Converter() {
            @Override
            public void convert(PathAddress address, String name, ModelNode value, ModelNode model, TransformationContext context) {
                if (model.hasDefined(listAttribute.getName())) {
                    List<ModelNode> list = model.get(listAttribute.getName()).asList();
                    if (!list.isEmpty()) {
                        value.set(list.get(0));
                    }
                }
            }
        });
    }
}
