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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;

import info.magnolia.config.registry.Registry;
import info.magnolia.context.Context;
import info.magnolia.resourceloader.Resource;

import java.util.Collection;
import java.util.Map;
import java.util.Set;

import org.mgnlconfig.yaml.dependency.ConfigDependency;

import com.google.common.base.Predicate;
import com.google.common.collect.Iterables;


public class YamlConfigurationDataProvider {

    private final Resource yamlFile;

    private final MgnlYaml mgnlYaml;

    private Collection dependencies;

    public YamlConfigurationDataProvider(Resource yamlFile, Context context, Set registries) {
        this.yamlFile = yamlFile;
        this.mgnlYaml = new MgnlYaml(context, yamlFile.getOrigin(), registries);
    }

    public Map parseConfigurationData() {
        final MgnlYaml.YamlConfigData yamlConfigData = mgnlYaml.parseYamlConfigData(yamlFile);
        this.dependencies = yamlConfigData.dependencies;
        return yamlConfigData.configData;
    }

    public boolean needsUpdate() {
        return Iterables.tryFind(dependencies, new Predicate() {
            @Override
            public boolean apply(ConfigDependency dep) {
                return dep.needsUpdate();
            }
        }).isPresent();
    }
}