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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 static info.magnolia.config.maputil.ToMap.toMap;

import java.util.Map;

import org.mgnlconfig.yaml.dependency.ConfigDependency;
import org.mgnlconfig.yaml.MapOverlay;
import org.yaml.snakeyaml.constructor.Construct;
import org.yaml.snakeyaml.nodes.Node;

public class ExtensionConstruct extends DelegateConstruct {

    private final ConfigDependency source;

    public ExtensionConstruct(Construct delegate, ConfigDependency source) {
        super(delegate);
        this.source = source;
    }

    @Override
    public Object construct(Node node) {
        final Map parent = toMap(source.getRawData());
        final Map yamlConfig = toMap(super.construct(node));

        //noinspection unchecked
        return MapOverlay.of(parent).by(yamlConfig).overlay();
    }
}