private SchemaFactory loadFromServicesFile()

in jaxp-api-1.4/src/main/java/javax/xml/validation/SchemaFactoryFinder.java [364:439]
44 lines of code
11 McCabe index (conditional complexity)

    private SchemaFactory loadFromServicesFile(String schemaLanguage, String resourceName, InputStream in) {

        if (debug) debugPrintln("Reading "+resourceName );
        
        // Read the service provider name in UTF-8 as specified in
        // the jar spec.  Unfortunately this fails in Microsoft
        // VJ++, which does not implement the UTF-8
        // encoding. Theoretically, we should simply let it fail in
        // that case, since the JVM is obviously broken if it
        // doesn't support such a basic standard.  But since there
        // are still some users attempting to use VJ++ for
        // development, we have dropped in a fallback which makes a
        // second attempt using the platform's default encoding. In
        // VJ++ this is apparently ASCII, which is a subset of
        // UTF-8... and since the strings we'll be reading here are
        // also primarily limited to the 7-bit ASCII range (at
        // least, in English versions), this should work well
        // enough to keep us on the air until we're ready to
        // officially decommit from VJ++. [Edited comment from
        // jkesselm]
        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;
        SchemaFactory 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 SchemaFactory if its isSchemaLanguageSupported(schemaLanguage) method returns true.
                    SchemaFactory foundFactory = (SchemaFactory) createInstance(factoryClassName);
                    if (foundFactory.isSchemaLanguageSupported(schemaLanguage)) {
                        resultFactory = foundFactory;
                        break;
                    }
                }
                catch (Exception e) {}
            }
            else {
                break;
            }
        }
        
        try {
            // try to close the reader.
            rd.close();
        }
        // Ignore the exception.
        catch (IOException exc) {}
        
        return resultFactory;
    }