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package utils;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
/**
* Provides version information for the application.
* This class reads version details from a properties file that is
* populated at build time by Maven resource filtering.
*
* @author Paul C. Buetow
*/
public final class VSVersionInfo {
private static final String VERSION_FILE = "/version.properties";
private static final Properties versionProps = new Properties();
private static boolean loaded = false;
/** Private constructor to prevent instantiation */
private VSVersionInfo() {}
/**
* Loads version properties from the resource file.
* This method is called automatically on first access.
*/
private static synchronized void loadProperties() {
if (loaded) {
return;
}
try (InputStream is = VSVersionInfo.class.getResourceAsStream(VERSION_FILE)) {
if (is != null) {
versionProps.load(is);
loaded = true;
} else {
// Fallback values if properties file not found
versionProps.setProperty("app.version", "Unknown");
versionProps.setProperty("app.name", "DS-Sim");
versionProps.setProperty("app.description", "Distributed Systems Simulator");
loaded = true;
}
} catch (IOException e) {
// Fallback values on error
versionProps.setProperty("app.version", "Unknown");
versionProps.setProperty("app.name", "DS-Sim");
versionProps.setProperty("app.description", "Distributed Systems Simulator");
loaded = true;
}
}
/**
* Gets the application version from Maven project version.
*
* @return the version string (e.g., "1.1.0")
*/
public static String getVersion() {
if (!loaded) {
loadProperties();
}
return versionProps.getProperty("app.version", "Unknown");
}
/**
* Gets the application name from Maven project name.
*
* @return the application name
*/
public static String getName() {
if (!loaded) {
loadProperties();
}
return versionProps.getProperty("app.name", "DS-Sim");
}
/**
* Gets the application description from Maven project description.
*
* @return the application description
*/
public static String getDescription() {
if (!loaded) {
loadProperties();
}
return versionProps.getProperty("app.description", "Distributed Systems Simulator");
}
/**
* Gets the build timestamp.
*
* @return the build timestamp or "Unknown" if not available
*/
public static String getBuildTimestamp() {
if (!loaded) {
loadProperties();
}
return versionProps.getProperty("build.timestamp", "Unknown");
}
/**
* Gets the full version string including name and version.
*
* @return formatted version string (e.g., "Distributed Systems Simulator 1.1.0")
*/
public static String getFullVersionString() {
return String.format("Distributed Systems Simulator %s", getVersion());
}
}
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