private String getJDeprScanExecutable()

in src/main/java/org/apache/maven/plugins/jdeprscan/AbstractJDeprScanMojo.java [94:152]
44 lines of code
15 McCabe index (conditional complexity)

    private String getJDeprScanExecutable() throws IOException {
        Toolchain tc = getToolchain();

        String jdeprscanExecutable = null;
        if (tc != null) {
            jdeprscanExecutable = tc.findTool("jdeprscan");
        }

        String jdepsCommand = "jdeprscan" + (SystemUtils.IS_OS_WINDOWS ? ".exe" : "");

        File jdeprscanExe;

        if (StringUtils.isNotEmpty(jdeprscanExecutable)) {
            jdeprscanExe = new File(jdeprscanExecutable);

            if (jdeprscanExe.isDirectory()) {
                jdeprscanExe = new File(jdeprscanExe, jdepsCommand);
            }

            if (SystemUtils.IS_OS_WINDOWS && jdeprscanExe.getName().indexOf('.') < 0) {
                jdeprscanExe = new File(jdeprscanExe.getPath() + ".exe");
            }

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

        jdeprscanExe =
                new File(SystemUtils.getJavaHome() + File.separator + ".." + File.separator + "sh", jdepsCommand);

        // ----------------------------------------------------------------------
        // Try to find jdepsExe from JAVA_HOME environment variable
        // ----------------------------------------------------------------------
        if (!jdeprscanExe.exists() || !jdeprscanExe.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.");
            }

            jdeprscanExe = new File(javaHome + File.separator + "bin", jdepsCommand);
        }

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

        return jdeprscanExe.getAbsolutePath();
    }