private static JsonProvider doLoadProvider()

in json-api-1.1/src/main/java/javax/json/spi/JsonProvider.java [90:156]
57 lines of code
14 McCabe index (conditional complexity)

    private static JsonProvider doLoadProvider() throws JsonException {
        final ClassLoader tccl = Thread.currentThread().getContextClassLoader();
        try {
            Class<? extends JsonProvider> spiClass = org.apache.servicemix.specs.locator.OsgiLocator.locate(
                    JsonProvider.class, JsonProvider.class.getName());
            if (spiClass != null) {
                return spiClass.newInstance();
            }
        } catch (final Throwable e) {
            // locator not available, try normal mode
        }

        // don't use Class.forName() to avoid to bind class to tccl if thats a classloader facade
        // so implementing a simple SPI when ProviderLocator is not here
        final String name = "META-INF/services/" + JsonProvider.class.getName();
        try {
            Enumeration<URL> configs;
            if (tccl == null) {
                configs = ClassLoader.getSystemResources(name);
            } else {
                configs = tccl.getResources(name);
            }

            if (configs.hasMoreElements()) {
                InputStream in = null;
                BufferedReader r = null;
                final List<String> names = new ArrayList<String>();
                try {
                    in = configs.nextElement().openStream();
                    r = new BufferedReader(new InputStreamReader(in, "utf-8"));
                    String l;
                    while ((l = r.readLine()) != null) {
                        if (l.startsWith("#")) {
                            continue;
                        }
                        return JsonProvider.class.cast(tccl.loadClass(l).newInstance());
                    }
                } catch (final IOException x) {
                    // no-op
                } finally {
                    try {
                        if (r != null) {
                            r.close();
                        }
                    } catch (final IOException y) {
                        // no-op
                    }
                    try {
                        if (in != null) {
                            in.close();
                        }
                    } catch (final IOException y) {
                        // no-op
                    }
                }
            }
        } catch (final Exception ex) {
            // no-op
        }

        try {
            final Class<?> clazz = tccl.loadClass(DEFAULT_PROVIDER);
            return JsonProvider.class.cast(clazz.newInstance());
        } catch (final Throwable cnfe) {
            throw new JsonException(DEFAULT_PROVIDER + " not found", cnfe);
        }
    }