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Epam common libraries
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package com.epam.commons;
/*
 * Copyright 2004-2016 EPAM Systems
 *
 * This file is part of JDI project.
 *
 * JDI 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 3 of the License, or
 * (at your option) any later version.
 *
 * JDI 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 JDI. If not, see .
 */

import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
import java.util.function.Consumer;

public final class PropertyReader {
    private static String propertiesPath;
    private static volatile Properties properties;
    private static InputStream inputStream;

    private PropertyReader() {
    }
    private static String getCorrectPath() {
        if (propertiesPath.charAt(0) != '/')
            propertiesPath = "/" + propertiesPath;
        return propertiesPath;
    }


    public static Properties readProperties() throws IOException {
        properties = new Properties();
        try {
            inputStream = PropertyReader.class.getResourceAsStream(getCorrectPath());
            if (inputStream != null)
                properties.load(inputStream);
        } catch (Exception ex) {
            if (inputStream != null) inputStream.close();
        }
        if(properties.getProperty("config_file")!=null){
            Properties additionalProperties = getProperties(properties.getProperty("config_file"));
            properties.putAll(additionalProperties);
        }
        return properties;
    }

    private static Properties loadProperties() throws IOException {
        return properties != null ? properties : readProperties();
    }

    public static Properties getProperties(String path) throws IOException {
        propertiesPath = path;
        return readProperties();
    }


    public static String getProperty(String propertyName) throws IOException {
        return loadProperties().getProperty(propertyName);
    }

    public static void fillAction(Consumer action, String name) {
        Object prop = null;
        try {
            prop = getProperty(name);
        } catch (Exception ignore) {}
        if (prop != null && !prop.equals(""))
            action.accept(prop.toString());
    }

}