protected String getJModExecutable()

in src/main/java/org/apache/maven/plugins/jmod/AbstractJModMojo.java [74:135]
42 lines of code
15 McCabe index (conditional complexity)

    protected String getJModExecutable() throws IOException {
        Toolchain tc = getToolchain();

        String jModExecutable = null;
        if (tc != null) {
            jModExecutable = tc.findTool("jmod");
        }

        String jModCommand = "jmod" + (Os.isFamily(Os.FAMILY_WINDOWS) ? ".exe" : "");

        File jModExe;

        if (StringUtils.isNotEmpty(jModExecutable)) {
            jModExe = new File(jModExecutable);

            if (jModExe.isDirectory()) {
                jModExe = new File(jModExe, jModCommand);
            }

            if (Os.isFamily(Os.FAMILY_WINDOWS) && jModExe.getName().indexOf('.') < 0) {
                jModExe = new File(jModExe.getPath() + ".exe");
            }

            if (!jModExe.isFile()) {
                throw new IOException("The jmod executable '" + jModExe + "' doesn't exist or is not a file.");
            }
            return jModExe.getAbsolutePath();
        }

        // ----------------------------------------------------------------------
        // Try to find jmod from System.getProperty( "java.home" )
        // By default, System.getProperty( "java.home" ) = JRE_HOME and JRE_HOME
        // should be in the JDK_HOME
        // ----------------------------------------------------------------------
        jModExe =
                new File(System.getProperty("java.home") + File.separator + ".." + File.separator + "bin", jModCommand);

        // ----------------------------------------------------------------------
        // Try to find jmod from JAVA_HOME environment variable
        // ----------------------------------------------------------------------
        if (!jModExe.exists() || !jModExe.isFile()) {
            Properties env = CommandLineUtils.getSystemEnvVars();
            String javaHome = env.getProperty("JAVA_HOME");
            if (StringUtils.isEmpty(javaHome)) {
                throw new IOException("The environment variable JAVA_HOME is not correctly set.");
            }
            if ((!new File(javaHome).getCanonicalFile().exists())
                    || (new File(javaHome).getCanonicalFile().isFile())) {
                throw new IOException("The environment variable JAVA_HOME=" + javaHome
                        + " doesn't exist or is not a valid directory.");
            }

            jModExe = new File(javaHome + File.separator + "bin", jModCommand);
        }

        if (!jModExe.getCanonicalFile().exists() || !jModExe.getCanonicalFile().isFile()) {
            throw new IOException("The jmod executable '" + jModExe
                    + "' doesn't exist or is not a file. Verify the JAVA_HOME environment variable.");
        }

        return jModExe.getAbsolutePath();
    }