private XPathFactory _newFactory()

in jaxp-api-1.3/src/main/java/javax/xml/xpath/XPathFactoryFinder.java [157:249]

• 78 lines of code
• 27 McCabe index (conditional complexity)

    private XPathFactory _newFactory(String uri) {
        XPathFactory sf;
        
        String propertyName = SERVICE_CLASS.getName() + ":" + uri;
        
        try {
            // If we are deployed into an OSGi environment, leverage it
            Class spiClass = org.apache.servicemix.specs.locator.OsgiLocator.locate(SERVICE_CLASS);
            if (spiClass != null) {
                return (XPathFactory) spiClass.newInstance();
            }
        } catch (Throwable e) {
        }

        // system property look up
        try {
            if (debug) debugPrintln("Looking up system property '"+propertyName+"'" );
            String r = SecuritySupport.getSystemProperty(propertyName);
            if(r!=null) {
                if (debug) debugPrintln("The value is '"+r+"'");
                sf = createInstance(r);
                if(sf!=null)    return sf;
            } 
            else if (debug) {
                debugPrintln("The property is undefined.");
            }
        } catch( Throwable t ) {
            if( debug ) {
                debugPrintln("failed to look up system property '"+propertyName+"'" );
                t.printStackTrace();
            }
        }
        
        String javah = SecuritySupport.getSystemProperty( "java.home" );
        String configFile = javah + File.separator +
        "lib" + File.separator + "jaxp.properties";

        String factoryClassName = null ;

        // try to read from $java.home/lib/jaxp.properties
        try {
            if(firstTime){
                synchronized(cacheProps){
                    if(firstTime){
                        File f=new File( configFile );
                        firstTime = false;
                        if(SecuritySupport.doesFileExist(f)){
                            if (debug) debugPrintln("Read properties file " + f);                                
                            cacheProps.load(SecuritySupport.getFileInputStream(f));
                        }
                    }
                }
            }
            factoryClassName = cacheProps.getProperty(propertyName);            
            if (debug) debugPrintln("found " + factoryClassName + " in $java.home/jaxp.properties"); 

            if (factoryClassName != null) {
                sf = createInstance(factoryClassName);
                if(sf != null){
                    return sf;
                }
            }
        } catch (Exception ex) {
            if (debug) {
                ex.printStackTrace();
            } 
        }
                    
        // try META-INF/services files
        Iterator sitr = createServiceFileIterator();
        while(sitr.hasNext()) {
            URL resource = (URL)sitr.next();
            if (debug) debugPrintln("looking into " + resource);
            try {
                sf = loadFromServicesFile(uri, resource.toExternalForm(), SecuritySupport.getURLInputStream(resource));
                if(sf!=null)    return sf;
            } catch(IOException e) {
                if( debug ) {
                    debugPrintln("failed to read "+resource);
                    e.printStackTrace();
                }
            }
        }
        
        // platform default
        if(uri.equals(XPathFactory.DEFAULT_OBJECT_MODEL_URI)) {
            if (debug) debugPrintln("attempting to use the platform default W3C DOM XPath lib");
            return createInstance("org.apache.xpath.jaxp.XPathFactoryImpl");
        }
        
        if (debug) debugPrintln("all things were tried, but none was found. bailing out.");
        return null;
    }