public String getMavenVersion()

in src/main/java/org/apache/maven/shared/verifier/ForkedLauncher.java [166:198]

27 lines of code
3 McCabe index (conditional complexity)


    public String getMavenVersion()
        throws IOException, LauncherException
    {
        File logFile;
        try
        {
            logFile = File.createTempFile( "maven", "log" );
        }
        catch ( IOException e )
        {
            throw new LauncherException( "Error creating temp file", e );
        }

        // disable EMMA runtime controller port allocation, should be harmless if EMMA is not used
        Map<String, String> envVars = Collections.singletonMap( "MAVEN_OPTS", "-Demma.rt.control=false" );
        run( new String[] { "--version" }, new Properties(), envVars, null, logFile );

        List<String> logLines = FileUtils.loadFile( logFile );
        // noinspection ResultOfMethodCallIgnored
        logFile.delete();

        String version = extractMavenVersion( logLines );

        if ( version == null )
        {
            throw new LauncherException( "Illegal Maven output: String 'Maven' not found in the following output:\n"
                + StringUtils.join( logLines.iterator(), "\n" ) );
        }
        else
        {
            return version;
        }
    }