Class ModVersion

jena-cmds/src/main/java/org/apache/jena/cmd/ModVersion.java:39–93

Version information. The version is the manifest entry in the jar file for a class. It is not available if the class comes from a development tree where the class file is from "target" (maven).

 * class file is from "target" (maven).
 */
public class ModVersion extends ModBase
{
    protected final ArgDecl versionDecl = new ArgDecl(ArgDecl.NoValue, "version");
    protected boolean version = false;
    protected boolean printAndExit = false;

    // (system name, version string)
    private List<Pair<String, Optional<String>>> descriptions = new ArrayList<>();

    public ModVersion(boolean printAndExit) {
        this.printAndExit = printAndExit;
    }

    /** Add a class for the version number */
    public void addClass(Class<? > c) {
        addClass(c.getSimpleName(), c);
    }

    /** Add a label and a class for the version number */
    public void addClass(String name, Class<? > cls) {
        Pair<String, Optional<String>> desc = Pair.create(name, Version.versionForClass(cls));
        descriptions.add(desc);
    }

    @Override
    public void registerWith(CmdGeneral cmdLine) {
        cmdLine.add(versionDecl, "--version", "Version information");
    }

    @Override
    public void processArgs(CmdArgModule cmdLine) {
        if ( cmdLine.contains(versionDecl) )
            version = true;
        // The --version flag causes us to print and exit.
        if ( version && printAndExit )
            printVersionAndExit();
    }

    public boolean getVersionFlag() {
        return version;
    }

    public void printVersion() {
        if ( descriptions.isEmpty() ) {
            Version.printVersion(System.out, null, Version.versionForClass(Jena.class));
            return;
        }
        descriptions.forEach(p->Version.printVersion(System.out, p.getLeft(), p.getRight()));
    }

    public void printVersionAndExit() {
        printVersion();
        System.exit(0);
    }
}