private XPathFactory loadFromServicesFile()

in jaxp-api-1.4/src/main/java/javax/xml/xpath/XPathFactoryFinder.java [305:364]
44 lines of code
11 McCabe index (conditional complexity)

    private XPathFactory loadFromServicesFile(String uri, String resourceName, InputStream in) {

        if (debug) debugPrintln("Reading " + resourceName );
        
        BufferedReader rd;
        try {
            rd = new BufferedReader(new InputStreamReader(in, "UTF-8"), DEFAULT_LINE_LENGTH);
        } catch (java.io.UnsupportedEncodingException e) {
            rd = new BufferedReader(new InputStreamReader(in), DEFAULT_LINE_LENGTH);
        }
        
        String factoryClassName = null;
        XPathFactory resultFactory = null;
        // See spec for provider-configuration files: http://java.sun.com/j2se/1.5.0/docs/guide/jar/jar.html#Provider%20Configuration%20File
        while (true) {
            try {
                factoryClassName = rd.readLine();   
            } catch (IOException x) {
                // No provider found
                break;
            }
            if (factoryClassName != null) {
                // Ignore comments in the provider-configuration file
                int hashIndex = factoryClassName.indexOf('#');
                if (hashIndex != -1) {
                    factoryClassName = factoryClassName.substring(0, hashIndex);
                }
                
                // Ignore leading and trailing whitespace
                factoryClassName = factoryClassName.trim();
                
                // If there's no text left or if this was a blank line, go to the next one.
                if (factoryClassName.length() == 0) {
                    continue;
                }
                
                try {
                    // Found the right XPathFactory if its isObjectModelSupported(String uri) method returns true.
                    XPathFactory foundFactory = (XPathFactory) createInstance(factoryClassName);
                    if (foundFactory.isObjectModelSupported(uri)) {
                        resultFactory = foundFactory;
                        break;
                    }
                }
                catch (Exception e) {}
            }
            else {
                break;
            }
        }
        
        try {
            // try to close the reader.
            rd.close();
        }
        // Ignore the exception.
        catch (IOException exc) {}
        
        return resultFactory;
    }