ch.rabanti.nanoxlsx4j.Version Maven / Gradle / Ivy

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/*
 * NanoXLSX4j is a small Java library to write and read XLSX (Microsoft Excel 2007 or newer) files in an easy and native way
 * Copyright Raphael Stoeckli © 2024
 * This library is licensed under the MIT License.
 * You find a copy of the license in project folder or on: http://opensource.org/licenses/MIT
 */
package ch.rabanti.nanoxlsx4j;

import ch.rabanti.nanoxlsx4j.exceptions.FormatException;

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

/**
 * Final class to provide metadata for the library
 *
 * @author Raphael Stoeckli
 */
public final class Version {

    // ### C O N S T A N T S ###
    /**
     * Application name of the library
     */
    public static final String APPLICATION_NAME = "NanoXLSX4j";

    /**
     * Gets the library version
     *
     * @return Version string of the library in the format "x.yyyy"
     */
    public static String getVersion() {
        try {
            Properties props = new Properties();
            try (InputStream is = Version.class.getResourceAsStream("/version.properties")) {
                props.load(is);
            }
            return transformVersion(props.getProperty("build.version"));
        }
        catch (Exception ex) {
            return "0.0000"; // Dummy fallback
        }
    }

    private static String transformVersion(String version) {
        String[] parts = version.split("\\.");
        int major = Integer.parseInt(parts[0]);
        int minor = Integer.parseInt(parts[1]);
        int patch = Integer.parseInt(parts[2]);
        if (major > 9999 || minor > 9999 || patch > 9999) {
            throw new FormatException("Invalid version number: " + version);
        }
        String minorPatch = String.format("%02d%02d", minor, patch);
        String versionNumber = String.format("%d.%s", major, minorPatch);
        if (versionNumber.length() > 7) {
            throw new FormatException("Invalid version number: " + version);
        }
        return versionNumber;
    }

    // ### C O N S T R U C T O R S ###
    private Version(){
        // Do not instantiate
    }
}