private static File getServiceMixHome()

in main/src/main/java/org/apache/servicemix/kernel/main/Main.java [340:385]
37 lines of code
10 McCabe index (conditional complexity)

    private static File getServiceMixHome() throws IOException {
        File rc = null;

        // Use the system property if specified.
        String path = System.getProperty(PROP_SERVICEMIX_HOME);
        if (path != null) {
            rc = validateDirectoryExists(path, "Invalid " + PROP_SERVICEMIX_HOME + " system property");
        }

        if (rc == null) {
            path = System.getenv(ENV_SERVICEMIX_HOME);
            if (path != null) {
                rc = validateDirectoryExists(path, "Invalid " + ENV_SERVICEMIX_HOME + " environment variable");
            }
        }

        // Try to figure it out using the jar file this class was loaded from.
        if (rc == null) {
            // guess the home from the location of the jar
            URL url = Main.class.getClassLoader().getResource(Main.class.getName().replace(".", "/") + ".class");
            if (url != null) {
                try {
                    JarURLConnection jarConnection = (JarURLConnection) url.openConnection();
                    url = jarConnection.getJarFileURL();
                    rc = new File(new URI(url.toString())).getCanonicalFile().getParentFile().getParentFile();
                } catch (Exception ignored) {
                }
            }
        }

        if (rc == null) {
            // Dig into the classpath to guess the location of the jar
            String classpath = System.getProperty("java.class.path");
            int index = classpath.toLowerCase().indexOf("servicemix.jar");
            int start = classpath.lastIndexOf(File.pathSeparator, index) + 1;
            if (index >= start) {
                String jarLocation = classpath.substring(start, index);
                rc = new File(jarLocation).getCanonicalFile().getParentFile();
            }
        }
        if (rc == null) {
            throw new IOException("The ServiceMix install directory could not be determined.  Please set the " + PROP_SERVICEMIX_HOME + " system property or the " + ENV_SERVICEMIX_HOME + " environment variable.");
        }

        return rc;
    }