rmblworx.tools.timey.ApplicationProperties.java Source code

Introduction

Here is the source code for rmblworx.tools.timey.ApplicationProperties.java

Source

package rmblworx.tools.timey;

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

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.io.ClassPathResource;

/*
 * Copyright 2014-2015 Christian Raue
 * MIT License http://opensource.org/licenses/mit-license.php
 */
/**
 * Zugriff auf Attribute der Anwendung.
 *
 * @author Christian Raue {@literal <christian.raue@gmail.com>}
 */
class ApplicationProperties {

    /**
     * Name des Attributs fr die Versionskennung.
     */
    static final String PROP_APP_VERSION = "application.version";

    /**
     * Name der Datei.
     */
    private static final String PROPERTY_FILENAME = "app.properties";

    /**
     * Logger.
     */
    private static Logger log = LoggerFactory.getLogger(ApplicationProperties.class);

    /**
     * Stream zum Auslesen der Attribute.
     */
    private InputStream inputStream;

    /**
     * Attribute.
     */
    private Properties properties;

    /**
     * Standardkonstruktor.
     */
    public ApplicationProperties() {
    }

    /**
     * Konstruktor fr Testzwecke.
     *
     * @param properties Attribute.
     * @param inputStream Stream zum Auslesen der Attribute.
     * @param logger Logger.
     */
    ApplicationProperties(final Properties properties, final InputStream inputStream, final Logger logger) {
        this.properties = properties;
        this.inputStream = inputStream;
        log = logger;
    }

    /**
     * @return Versionskennung oder {@code null}, wenn sie nicht ermittelt werden kann.
     */
    public String getVersion() {
        try {
            if (inputStream == null) {
                inputStream = new ClassPathResource(PROPERTY_FILENAME).getInputStream();
            }

            if (properties == null) {
                properties = new Properties();
            }

            properties.load(inputStream);

            return properties.getProperty(PROP_APP_VERSION);
        } catch (final IOException e) {
            log.error("Error while trying to read the property file: " + e.getLocalizedMessage());
            return null;
        } finally {
            TimeyUtils.closeQuietly(inputStream);
        }
    }

}