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Neo4j kernel is a lightweight, embedded Java database designed to store data structured as graphs rather than tables. For more information, see http://neo4j.org.

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/*
 * Copyright (c) 2002-2015 "Neo Technology,"
 * Network Engine for Objects in Lund AB [http://neotechnology.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */
package org.neo4j.kernel.configuration;

import java.lang.reflect.Field;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;

import org.neo4j.graphdb.config.Setting;
import org.neo4j.helpers.Function;
import org.neo4j.helpers.Functions;

/**
 * Collect settings from System.getProperties(). For the given settings classes, using the Setting pattern,
 * check if the individual settings are available as system properties, and if so, add them to the given map.
 */
public class SystemPropertiesConfiguration
{
    private Iterable> settingsClasses;

    public SystemPropertiesConfiguration(Class... settingsClasses)
    {
        this( Arrays.asList( settingsClasses ));
    }

    public SystemPropertiesConfiguration( Iterable> settingsClasses )
    {
        this.settingsClasses = settingsClasses;
    }

    public Map apply(Map config )
    {
        // Create test config with base plus system props on top
        Map systemProperties = new HashMap( config );
        for ( Map.Entry prop : System.getProperties().entrySet() )
        {
            systemProperties.put( prop.getKey().toString(), prop.getValue().toString() );
        }

        // For each system property, see if it passes validation
        // If so, add it to result set
        Map result = new HashMap( config );
        Function systemPropertiesFunction = Functions.map(systemProperties);
        for( Map.Entry prop : System.getProperties().entrySet() )
        {
            String key = (String) prop.getKey();
            for( Class settingsClass : settingsClasses )
            {
                for( Field field : settingsClass.getFields() )
                {
                    try
                    {
                        Setting