static JAXBContext find()

in jaxb-api-2.2/src/main/java/javax/xml/bind/ContextFinder.java [242:311]
48 lines of code
9 McCabe index (conditional complexity)

    static JAXBContext find(String factoryId, String contextPath, ClassLoader classLoader, Map properties ) throws JAXBException {

        // TODO: do we want/need another layer of searching in $java.home/lib/jaxb.properties like JAXP?

        final String jaxbContextFQCN = JAXBContext.class.getName();

        // search context path for jaxb.properties first
        StringBuilder propFileName;
        StringTokenizer packages = new StringTokenizer( contextPath, ":" );
        String factoryClassName;

        if(!packages.hasMoreTokens())
            // no context is specified
            throw new JAXBException(Messages.format(Messages.NO_PACKAGE_IN_CONTEXTPATH));


        logger.fine("Searching jaxb.properties");

        while( packages.hasMoreTokens() ) {
            String packageName = packages.nextToken(":").replace('.','/');
            // com.acme.foo - > com/acme/foo/jaxb.properties
             propFileName = new StringBuilder().append(packageName).append("/jaxb.properties");

            Properties props = loadJAXBProperties( classLoader, propFileName.toString() );
            if (props != null) {
                if (props.containsKey(factoryId)) {
                    factoryClassName = props.getProperty(factoryId);
                    return newInstance( contextPath, factoryClassName, classLoader, properties );
                } else {
                    throw new JAXBException(Messages.format(Messages.MISSING_PROPERTY, packageName, factoryId));
                }
            }
        }

        logger.fine("Searching the system property");

        // search for a system property second (javax.xml.bind.JAXBContext)
        factoryClassName = AccessController.doPrivileged(new GetPropertyAction(jaxbContextFQCN));
        if(  factoryClassName != null ) {
            return newInstance( contextPath, factoryClassName, classLoader, properties );
        }

        logger.fine("Searching META-INF/services");

        // search META-INF services next
        BufferedReader r;
        try {
            final StringBuilder resource = new StringBuilder().append("META-INF/services/").append(jaxbContextFQCN);
            final InputStream resourceStream =
                    classLoader.getResourceAsStream(resource.toString());
            
            if (resourceStream != null) {
                r = new BufferedReader(new InputStreamReader(resourceStream, "UTF-8"));
                factoryClassName = r.readLine().trim();
                r.close();
                return newInstance(contextPath, factoryClassName, classLoader, properties);
            } else {
                logger.fine("Unable to load:" + resource.toString());
            }
        } catch (UnsupportedEncodingException e) {
            // should never happen
            throw new JAXBException(e);
        } catch (IOException e) {
            throw new JAXBException(e);
        }

        // else no provider found
        logger.fine("Trying to create the platform default provider");
        return newInstance(contextPath, PLATFORM_DEFAULT_FACTORY_CLASS, classLoader, properties);
    }