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Enhances extension capabilities of Yaml configuration files (~ to JCR 'extends' property), provides connection to the JCR config workspace and to all the registries as well

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/**
 * This file Copyright (c) 2016 Magnolia International
 * Ltd.  (http://www.magnolia-cms.com). All rights reserved.
 *
 *
 * This file is dual-licensed under both the Magnolia
 * Network Agreement and the GNU General Public License.
 * You may elect to use one or the other of these licenses.
 *
 * This file is distributed in the hope that it will be
 * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
 * implied warranty of MERCHANTABILITY or FITNESS FOR A
 * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
 * Redistribution, except as permitted by whichever of the GPL
 * or MNA you select, is prohibited.
 *
 * 1. For the GPL license (GPL), you can redistribute and/or
 * modify this file under the terms of the GNU General
 * Public License, Version 3, as published by the Free Software
 * Foundation.  You should have received a copy of the GNU
 * General Public License, Version 3 along with this program;
 * if not, write to the Free Software Foundation, Inc., 51
 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * 2. For the Magnolia Network Agreement (MNA), this file
 * and the accompanying materials are made available under the
 * terms of the MNA which accompanies this distribution, and
 * is available at http://www.magnolia-cms.com/mna.html
 *
 * Any modifications to this file must keep this entire header
 * intact.
 *
 */
package org.mgnlconfig.yaml.constructs;

import java.util.List;
import java.util.Map;

import org.yaml.snakeyaml.constructor.Construct;
import org.yaml.snakeyaml.nodes.Node;

import com.google.common.base.Function;
import com.google.common.collect.FluentIterable;

public class ListConstruct extends DelegateConstruct {

    public static final String NAME_PID = "name";

    public ListConstruct(Construct delegate) {
        super(delegate);
    }

    @Override
    public Object construct(Node node) {
        return toList(super.construct(node));
    }

    @SuppressWarnings("unchecked")
    private List toList(Object value) {
        if (value instanceof List) {
            return (List) value;
        }

        if (value instanceof Map) {
            final Map map = (Map) value;
            final Function, Object> entry2Value = new Function, Object>() {
                @Override
                public Object apply(Map.Entry input) {
                    final Object returnValue = input.getValue();
                    if (returnValue instanceof Map) {
                        final Map mapValue = (Map) returnValue;
                        if (!mapValue.containsKey(NAME_PID)) {
                            mapValue.put("name", input.getKey());
                        }
                    }
                    return returnValue;
                }
            };
            return FluentIterable.from(map.entrySet()).transform(entry2Value).toList();
        }

        return null;
    }
}